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Linear Technology Corp.

1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: 408-432-1900
Fax: 408-434-0507

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Recent Articles for Linear Technology Corp.:
Buck converter steps 36 V down to 3.3 V
The LTC3646 is a 40-V input capable synchronous buck converter that delivers 1-A continuous output current from a 3 . . .
Linear Technology: PoE++ PD controllers provide 90 W
The LT4275 powered-device (PD) interface controllers are LTPoE++-. PoE+-, and PoE-compliant and target applications requiring up to 90 W. . . .
HEV battery monitor features 0.04% acc.
The LTC6804 high voltage battery monitor targets hybrid electric and electric vehicles, and other high voltage, stacked-battery systems. It . . .
Wireless sensor networks offers industry’s lowest power
The SmartMesh LTC5800 (system-on-chip) and LTP5900 (module) families are offered as the industry’s lowest power IEEE 802.15.4E compliant wireless . . .
IF gain block offers 47-dBm OIP3,15.5-dB gain
The 15.5-dB LTC6431-15 IF gain block achieves a high dynamic range in a 50-Ω environment from 20 MHz to . . .

Videos for Linear Technology Corp.:
Low Noise Rail-to-Rail Negative Regulator with Programmable Current Limit
The LT®3090 is a low noise single resistor programmable negative regulator based upon current reference architecture. The advantage of this architecture is that output voltage is rail-to-rail programmable while always maintaining unity gain operation. Hence, the bandwidth/transient response, noise, PSRR and load regulation are all independent of output voltage. Additionally, the LT3090 features programmable current limit, positive or negative current monitoring, programmable cable drop compensation, bidirectional shutdown capability and can be easily paralleled for higher current operation or heat spreading on surface mounted board. The LT3090’s low noise and rich feature set make it ideal for a variety of applications
True 18-Bit DAC for Extreme Precision Applications - LTC2757 - LTC2757
LTC2757 True 18-Bit DAC for Extreme Precision Applications
Precision digital-to-analog converters are key components in many instrumentation, industrial control and test equipment applications. When customers purchase an "N-bit" DAC, the expectation is that every parameter will be better than 1 least-significant bit. This is a difficult task, even at the 16-bit level. Linear Technology's LTC2757 breaks new ground in DAC technology, achieving true 18-bit linearity and sub-part per million drift. Six SoftSpan output ranges greatly simplify the design of systems with multiple ranges. The LTC2757 can significantly improve the performance of precision systems while reducing cost by eliminating the need for temperature and linearity compensation.
Digital Power System Management
Take control of your power supplies. Simplify and accelerate system characterization, optimization and data mining during prototyping, deployment and field operation with Linear Technology’s Power System Management products. A PSM product is configured via a PC over a 2-wire PMBus I²C-based digital interface protocol. The easy to use yet powerful GUI software, LTpowerPlay, provides control and monitoring of power usage, voltages, sequencing, margining and “black box” fault data logging.
Using LTpowerPlay to Manage the LTC2978 - LTC2978
LTC2978 LTpowerPlay to Manage_final-1
The LTC2978 features enable power supply supervision, monitoring, sequencing and trimming with unmatched accuracy. These features combined with our easy to use GUI, assist the power supply designer in defining and implementing complex power management schemes in a fraction of the time previously possible. Fault logging capability enables system level debug of power faults.
Power USB Vbus in Cars with the LT8697
USB sockets appear in an increasing number of car models as portable devices become more ubiquitous. The USB interface delivers power to portable devices via the 5V VBUS and ground lines. Depending on the USB version and the portable device, the VBUS sources up to 2.1A. In a car, this high VBUS current presents a challenge. Often, car electronics including the VBUS regulator reside in a box in the dash while some of the USB sockets may be placed in the back seat. The cabling between the VBUS regulator and the socket can be several meters in length and twice that counting the return trip. Long cables mean high resistance, so the 5V VBUS supply drops out at high USB device current.
Maximum Power Point Control Simplifies Energy Harvesting - LTC3105
LTC3105 Maximum Power Point Control Simplifies Energy Harvesting
There is an increasing market for low power electronic devices located in remote locations, away from the power grid. Ideally, the power for these devices should be generated on-site using renewable energy. Perhaps the most visible form of renewable energy is from the sun. Converting this solar energy into electrical energy is easily done using Linear Technology’s LTC3105 boost converter with Maximum Power Point Control. The MPPC feature allows the converter to extract the maximum power from a solar cell under varying sunlight conditions.
SmartMesh IP Wireless Sensor Network Starter Kit
The SmartMesh IP product line achieves unsurpassed levels of networking resilience, reliability, and scalability with advanced network management and comprehensive security.
Energy Harvesting Applications - LTC3588-1
LTC3588-1 Energy_Harvesting_Apps-v3_h264
Energy harvesting applications are finding their way into many remote monitoring applications where utility power is not available. New developments in ultralow power microcontrollers with their high level of integration are enabling monitoring systems which draw sub milliwatts of power. Various energy sources that were not useful as power sources for electronic sensors can now be used. The energy harvesting system must be highly efficient and present minimal loading effect on the energy source and the output storage elements when in their "sleep" mode. The LTC3588-1 is a complete solution to energy harvesting systems. It requires only 3 external components plus an input and output energy storage element.
150v, 100mA Step-Down Regulator Requires Only Three External Components
The LTC3639 can supply up to 100mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size.
Synchronous Stepdown Regulator with Programmable Reference - LTC3600
LTC3600 Synchronous_Stepdown_Regulator_with_Programmable Refl
The standard design of a general purpose switching step-down regulator relies on a control loop that requires the user to attenuate the output signal to compare to a voltage reference. By thinking outside the box and designing a regulator that relies on a unity-gain control loop and a current reference, the LTC®3600 can create unique and elegant application circuits that cannot be easily duplicated by other monolithic switching regulators. The ability to operate in a unity-gain configuration allows board trace to be used as ballasting to ensure even load sharing. The LTC3600 can also generate a tracking supply alongside a LT®3080 linear regulator to build a high-efficiency, low noise supply rail.
Cable/Wire Drop Compensator- LT6110
The LT®6110 is a precision high side current sense with a current mode output, designed for controlling the output voltage of an adjustable power supply or voltage regulator. This can be used to compensate for drops in voltage at a remote load due to resistance in a wire, trace or cable. The LT6110 monitors load current via a series-connected internal or external sense resistor. Two current mode outputs, one sinking and one sourcing, are provided that are proportional to the load current. This allows the LT6110 to adjust the output voltage of a wide variety of regulators. Either output may be used to monitor the load current. Low DC offset allows for the use of a small sense resistor, as well as precise control of small variations in wire voltage drop.
Design a Simple, Efficient and Reliable Forward Converter - LTC3765
LTC3765 Design a Simple Efficient and Reliable Forward Converter
Due to the high cost and inflexibility of isolated DC/DC converter modules, many designers are choosing to implement a discrete design that is better matched to their application. In particular, the forward converter with active clamp reset has been widely used in custom supplies because of its excellent efficiency and reduced component stress. While the active clamp reset technique has advantages, it also introduces performance limitations and potential reliability concerns that have limited the scope of its use. The LTC3765/66 is a second-generation chip-set that breaks new ground by making forward converters more simple, efficient and reliable than ever before. Using Direct Flux Limit, this chipset eliminates both the reliability concerns and performance limitations of the active clamp forward converter. In addition, advanced features such as pre-bias start-up, average current limit and no-opto secondary-side control simplify a wide array of applications including isolated battery chargers.
Minimizing Switching Regulator Residue in Linear Regulator Outputs
Linear regulators are commonly employed to post-regulate switching regulator outputs. Benefits include improved stability, accuracy, transient response and lowered output impedance. Ideally, these performance gains would be accompanied by markedly reduced switching regulator generated ripple and spikes. In practice, all linear regulators encounter some difficulty with ripple and spikes, particularly as frequency rises. This video, excerpted from LTC Application Note 101, explains the causes of linear regulators’ dynamic limitations and presents board level techniques for measuring and improving ripple and spike rejection.
Small Size and Very High Efficiency Buck-Boost Converter - LTC3780
LTC3780 Small Size and Very High Efficiency Buck-Boost Converter
Many applications such as battery-powered supply have a wide input voltage that can be lower or higher than the regulated output voltage. The conventional solutions, such as flyback, Sepic or a 2-stage supply are usually complicated and inefficient. The single-stage buck-boost converter only needs a small size inductor with good efficiency. With the LTC3780, the synchronous buck-boost converter can offer an impressive 8% to 10% efficiency gain over a typical flyback or Sepic solution. Furthermore, the 4-switch synchronous buck-boost converter can be integrated in a very small 15mm x 15mm x 3mm, 60W, LTM4605/7/9 power module with a single external inductor. With current mode control, the LTM460x modules can be easily paralleled for more current and power with good current sharing and thermal balance.
60V High-Current Step-Down LED Driver Controller - LT3763
The meaning of the term “high power LED” is rapidly evolving. Although a 350mA LED could easily earn the stamp of “high power” a few years ago, now, 5A to 40A LEDs and laser diodes are used in the DLP projector, surgical equipment, stage lighting, automotive lighting and other applications traditionally served by high intensity bulbs. To meet the light output requirements of these applications, high power LEDs are often used in series. The problem is that several series-connected LEDs require a high voltage LED driver circuit. LED driver design is further complicated by many applications that require fast LED current response to pulse width modulated (PWM) dimming signals. The new LT®3763 is a 60V synchronous, step-down DC/DC controller designed to accurately regulate LED current at up to 20A with fast PWM dimming. It is a higher voltage version of its predecessors, the LT3743 and the LT3741. In addition to higher voltage, the LT3763 has 4 regulation loops that make it easy to design highly efficient, versatile and robust circuits.
Synchronous PolyPhase Boost Converter for Cool and Powerful Applications - LTC3788
LTC3788 Synchronous PolyPhase Boost Converter
Boost power conversion is important function in many industrial, automotive and commercial applications. Higher power level customers have to deal with issues of high ripple currents, high power dissipation and higher EMI levels. Linear Technology’s LTC3788 breaks new ground in boost converter technology, achieving the highest efficiency with synchronous PolyPhase operation. Two separate synchronous boost channels allow the part to be used in single or dual output applications. The part can be used in PolyPhase applications with 2-, 4- and 6-phases. Also, the LTC3788 circuits can be smaller and less expensive, thanks to low power dissipation in synchronous rectifiers. Overall, LTC3788 can significantly improve the performance of high current, high power, boost circuits.
1ppm Settling Time Measurement for a New Monolithic DAC
The LTC2757, a new 18-bit DAC, requires careful measurement techniques to verify performance. Performance verification at DC is relatively straightforward using precision DVMs. Dynamic conditions considerably complicate measurement. In particular, determining DAC settling within 10 microvolts after a 10-volt step with a 275 nanosecond measurement resolution limit requires trustworthy instrumentation and investigator prudence. This video, based on LTC application note 120, describes a technique enabling an oscilloscope to accurately display DAC settling information with 1ppm resolution. The approach employed permits observation of small amplitude information at the excursion limits of large waveforms without overdriving the oscilloscope. Measuring anything at any speed to 1ppm (.0001%) is hard. Dynamic measurement to this resolution is particularly challenging. Reliable 1ppm settling time measurement constitutes a high order difficulty problem requiring care in approach and experimental technique.
Integration of Analog DC/DC Controller with Digital Power Management - LTC3880
LTC3880 Integration of Analog DC DC Controller with Digital Power Management
Modern electronics systems require high performance point of load power supplies with advanced and intelligent power management. Linear Technology’s LTC®3880 combines a best in class analog switching regulator controller with precise mixed signal data conversion for unsurpassed ease of power system design and management. The analog current mode control architecture of LTC3880 ensures best loop stability, transient responses, accurate DC and dynamic current sharing. In addition to that, the LTC3880 is a comprehensive digital power manager with over 100 PMBus compliant commands and on-chip EEPROM. On-chip precision data converters and EEPROM allow for the capture and nonvolatile storage of regulator configuration settings and telemetry variables. LTC3880 is supported by LTpowerPlayTM Design Tool, an easy-to-use and powerful graphical user interface program. The LTC3880 can be used for computer, datacom, telecom equipment and storage systems.
Diode Turn-On Time Induced Failures in Switching Regulators
Most circuit designers are familiar with diode dynamic characteristics such as charge storage, voltage dependent capacitance and reverse recovery time. Less commonly acknowledged and manufacturer specified is diode forward turn-on time. This parameter describes the time required for a diode to turn on and clamp at its forward voltage drop. Historically, this extremely short time, units of nanoseconds, has been so small that user and vendor alike have essentially ignored it. It is rarely discussed and almost never specified. Recently, switching regulator clock rate and transition time have become faster, making diode turn-on time a critical issue. A potential difficulty due to diode turn-on time is that the resultant transitory “overshoot” voltage across the diode, even when restricted to nanoseconds, can induce overvoltage stress, causing switching regulator IC failure. This video provides a testing methology enabling proper diode selection for switching regulators.
Single Phase Step-Down DC/DC Controller with Digital Power System Management and Input Current Sense - LTC3883
LTC3883 Single Phase Step-Down_10-12_Final
The digital power supply market has achieved rapid progress in the recent years. Easy configuration, accurate telemetry, convenient fault analysis and reliability are the trends for the modern digital power supply, which are all provided by Linear’s new digital power controller, the LTC3883. The LTC3883 is a single phase synchronous buck controller with integrated N-channel MOSFET drivers. The input voltage range is from 4.5V to 24V; the output voltage can be remotely sensed, from 0.5V to 5.5V. The PMBus provides programmable voltage, current limits, sequencing, margining, OV/UV thresholds and frequency synchronization. Over the operation temperature range, the output voltage accuracy is guaranteed to be within ±0.5%. The LTC3883’s control loop is analog peak current mode control, which provides excellent the stability as well as a fast transient performance. The LTC3883 uses a sense resistor to accurate sense the power stage and the chip’s input current. Also, LTC3883 contains Linear Technology’s new, patent pending, inductor DCR auto calibration function. With this new method, the output current read back accuracy can be within 3% regardless of inductor tolerance. The LTC3883 is supported by LTpowerPlay software, an easy-to-use and powerful graphical user interface program. The LTC3883 can be used for computing, telecom equipment and storage systems.
LS8 Package Improves Stability of Voltage References
Stability of precision electronic circuits is often dominated by the stability of the voltage reference. Most electronic systems rely on one or more voltage references to ensure that measurements or performance meets specifications, especially over long periods of time. Environmental factors directly affect the stability of a voltage reference. While most system designers understand the effects of temperature change on the reference voltage, as defined by temperature coefficient, many do not realize how significant the thermal hysteresis and long term stability can be. Further, even those that do have few options for keeping those errors low. In addition, plastic IC packaging absorbs water. It is not widely known that the relative humidity can have a significant effect on stability as well. The most effective way to address this is with a hermetic package. Most hermetic packages, including metal cans and ceramic alternatives, are either large, difficult to get, expensive, difficult to use in manufacturing due to leads that require through-hole PCB mounting, or a combination of these. The LS8 package is a hermetic ceramic package that gives substantially better performance than plastic, while at the same time is small, surface-mount and low-cost as compared to alternatives. Hysteresis and long term stability are improved in this package, and humidity effects are eliminated.
Transform a DC/DC Converter into a High Performance, Full-Featured Battery Charger - LTC4000
LTC4000 Tranform a DC DC Convereter into a High Performance
Portable electronic devices, powered by batteries, require battery chargers. In higher powered applications, efficiency and thermal management requirements lead to solutions using DC/DC converters. DC/DC converter controllers do not have the accuracy and features required for advanced battery charging and PowerPath™ management. Linear Technology’s LTC®4000 has the accuracy and features required to turn a DC/DC converter into a high performance battery charger with features such as charge current and input current regulation, charge voltage and system voltage regulation, C/X or timer termination, trickle charge, temperature qualified charging, instant on and ideal diode/ PowerPath control. It handles a wide variety of applications with input and output voltages from 3V to 60V. The LTC®4000 easily adds these capabilities to a typical DC/DC converter.
How To Make A Thermocouple Meter With The LTC2492
This video explains how to use the 24-bit LTC2492 2-channel delta-sigma analog-to-digital converter with Easy Drive Input Current Cancellation to make thermocouple measurements. The ADCs features and benefits are discussed, as is cold junction compensation; this is followed by a lab demonstration of the LTC2492 thermocouple meter. Errata: When the internal temp sensor on the LTC2492 is used, a 2V or higher reference is needed. Please refer to the LTC2492 datasheet for detailed information.
Floating Surge Stopper Provides Unlimited Overvoltage Protection - LTC4366
LTC4366 Floating Surge Stopper Provides Unlimited Overvoltage Protection_10-12_v2_final
Protecting sensitive electronic circuitry from voltage transients is an essential part of any system be it automotive, industrial, avionics or even battery-powered consumer applications. Linear Technology offers a wide variety of solutions for these applications with its surge stopper family. The LTC®4366 is the new exciting member of this surge stopper family. The LTC4366 is a high voltage surge stopper with a floating topology which allows it to suppress voltage transients far exceeding its ABS max ratings. Dual shunt regulators allow the part to float up with the supply and suppress transients at a user defined level. The voltage is regulated with the help of an external MOSFET which is controlled by the LTC4366. The operating voltage can literally be thousands of volts with the only limitation being the safe operating area (SOA) of the MOSFET used in conjunction with the part. Once the output reaches the clamp voltage a timer runs. Once the timer expires the LTC4366 turns the MOSFET off. The timer and clamp voltage are adjustable, allowing full flexibility to the user. During operation, the entire circuit consumes only a few milliamperes. The device may be shut down to less than 20µA making it an ideal solution for the power conscious. High voltage applications include protecting from motor transients, coupled overvoltage, incorrect input supplies or power supply failures. While traditional protection circuitry relies on bulky inductors, capacitors, fuses and transient voltage suppressors to clamp the transient, the LTC4366 protects by series regulating the transient. It is packaged in a tiny 8-lead TSOT-23 and 3mm x 2mm DFN packages.
Directly Parallel This High Power Density Linear Regulator - LT3080
The LT3080 is a new architecture for linear regulators. It provides better regulation, a simple output adjustment with a single resistor where the output can be adjusted down to zero. Also, this architecture allows easy paralleling of regulators for “no heatsink” operation in an all surface mount applications. The LT3080 circuit operation and applications for paralleling, spreading the heat, general purpose power supplies and current sources will be shown
Low Power RF Mixers Enhance Receiver Performance - LTC5540
LTC5540 Low Power RF Mixers Enhance Receiver Performance
RF mixers are critical components that make up the modern transceivers used in 3G and 4G wireless infrastructure, communication gears and military systems. The receivers’ robustness depends on their dynamic range performance. The LTC5540/41/42/43 family of RF downconverting mixers covering frequencies from 600MHz to 4GHz, offers outstanding IIP3, conversion gain and noise figure performance. In addition, these mixers consume 40% less power than their closest rivals, while capable of handling unusually high in-band interference than any other comparable devices. Moreover, these mixers require fewer external components that reduce the solution footprint. Thus these best-in-class mixers allow us to build compact, power efficient receivers without compromising performance.
IC Current Sources - LT3092
Current sources have been a well known but theoretical circuit component. Unlike voltage sources, a 0.01% accurate 2-terminal current source has been an elusive component that is not easily available and difficult to design. With the introduction of the LT3092, the current source as a drop-in component becomes a reality. The LT3092 make an easily settable, high impedance and low temperature coefficient current source.
Optimizing the Performance of Wideband Zero-IF Receivers - LTC5585
LTC5585 Optimizing_Performance_5-12-v2final
The zero-IF receiver architecture gains popularity in wireless applications because of its suitability to demodulate very wideband RF signals. This capability is important in digital pre-distortion (DPD) transmitters. Realization of sufficient dynamic range is commonly known to be a major issue of zero-IF architectures. DC offsets and second-order intermodulation products are both co-located in frequency with the signal of interest and therewith reduce the receiver sensitivity. Linear Technology’s new LTC5584 and LTC5585 I/Q demodulators are capable of demodulating RF signals with more than 500MHz bandwidth, while maintain high receiver dynamic range. This is achieved though the unique capability of these demodulators to minimize DC offset and IM2 products in the baseband outputs through simple adjustment of a DC control voltage.
How To Design a Simple Isolated Flyback Converter - LT3573al
Isolated power supplies are needed in a wide variety of applications. Galvanic isolation is achieved by isolating two or more circuits using a transformer or optocoupler, and is desirable for many reasons: safety, noise immunity, circuit protection, etc. Traditionally, isolated power supplies use an optocoupler to transfer regulation information across the isolation barrier. An optocoupler’s gain characteristic varies widely over temperature and over lifetime and since it appears in the feedback loop, it presents significant challenges with regards to the loop compensation of the power supply. Linear Technology’s LT3573 uses innovative internal circuitry to obsolete the optocoupler, greatly simplifying the design of an isolated flyback converter.
Simple Ways To Measure Current - LTC6101, LTC6102, LTC6103, LTC6104
LTC6102 Simple ways to Measure Current
Measuring current is one of the basic requirements in many electronic systems; whether for precise control or simple protection of circuit elements. A family of new devices from Linear Technology has been produced to greatly simplify the measurement of DC or AC current. Using only external resistors, each small device can be tailored to specific needs and used in a wide range of operating conditions. This video will show basic, precision, bi-directional and high voltage circuits for measuring current. In each example, the difficult task of measuring a current on a high voltage rail is shown.
High-Power Boost/SEPIC/Inverting DC/DC Converters with Fault Protection LT3579
High-powered boost converters have historically suffered from the shortcoming that a DC path exists between the input and output nodes. Fault conditions, such as output shorts, could easily damage or destroy key components in this path. Other topologies, such as the SEPIC or inverting converters can also suffer from faults such as input over voltage or input reverse voltage conditions. Linear Technology’s LT3581 and LT3579 breaks new ground in high-powered monolithic DC/DC converter technology. Besides including high voltage high current power switches (3.3A, 42V for the LT3581 and 6A, 42V for the LT3579), the parts include built in fault protection features. With the addition of a few external components, power conversion circuits build around these parts can survive output shorts, input over voltages, input reverse voltages and over temperature conditions.
IF/RF Gain Block State-of-the-Art Performance the Easy Way - LTC6431-15
LTC6431-15 IFRF Gain Block_10-12_Final
Bandwidth has become more precious than gold. As we push more and more data wirelessly through our smartphones, tablets, GPS, and video players, the spectrum has become more crowded. Increasingly complex and efficient modulation schemes allow us to carry more MBits/mHz through the air. However, the key to these demanding schemes is a high fidelity signal path. Achieving high linearity and low noise while dissipating a minimum of power are keys to achieving these increased data rates within a limited spectrum and power budget. Similarly, components with built-in ease-of-use and guaranteed specifications are keys to quick, painless design cycles. Linear Technology's LTC®6431-15 IF/RF amplifier has been specifically designed with all of these attributes in mind. It simultaneously offers both high linearity and low noise while keeping power dissipation in check. At the same time, it offers unmatched ease-of-use and guaranteed minimum linearity specs. The LTC6431-15 is a 15dB gain amplifier that is internally matched to 50O at both the input and output from 20MHz to 1700MHz. All of the common implementation difficulties of IF/RF amplifiers have been taken care of within the device itself. The LTC6431-15 is unconditionally stable, its internal active bias circuit compensates for temperature variations, and an internal voltage regulator minimizes sensitivity to supply voltage variations. While easy to use, the LTC6431-15 is no slacker in performance. It boasts an OIP3 of 47dBm and a noise figure NF of 3.3dB at 240 MHz, making it a perfect choice for many signal chain applications. Furthermore, it achieves this wide dynamic range while only using 90mA from a single 5V supply. At Linear, we have gone a step further. All Grade A LTC6431-15 devices are OIP3 tested and guaranteed for OIP3 performance. With its ability to linearly drive 50O, the LTC6431-15 is an ideal amplifier to restore IF filter insertion losses or add gain where needed. Its linearity is sufficient to drive many 14-and 16-bit ADCs. And because of its wide bandwidth, this device is an ideal CATV driver, 700MHz-800MHz LTE amplifier or military/satellite communication amplifier.
Switching Regulator Power Loss - LT3690
Efficiency is a misleading number for comparison of switching regulators. The efficiency number can be manipulated by the input and output voltage, while power loss is more tightly tied to the actual circuit. This video explains why.
Innovation Pushes State-of-the-Art in Voltage References - LTC6655
LTC6655 Innovation Pushes Stat of the Art in Voltage Ref
Most system designers use voltage references in their circuits. While many will agree that the performance may ultimately be limited by the reference, they are often unclear as to why. With so many reference products available, designers often choose based on a tradeoff between price and precision, using only initial accuracy and TC specs as a measure of precision. As applications have evolved, so have voltage references. Features such as noise, thermal stability, load and line regulation and size may be just as important as, or more important than, the more obvious precision specifications. Three new products from LTC, the LT6654, LTC®6655 and LT6656, have carefully chosen combinations of features and specifications to make them especially compatible with common types of applications. This presentation gives details as to these features and introduces the products that are best suited for these types of system designs.
High Current LED Driver with Three-State Control - LT3743
There are many LED drivers on the market for low current LEDs and many others for high current LEDs. Low current LEDs are 20mA to 100mA LEDs. High current ones are 100mA to ~1A. But how many 20A LED drivers do you know? How about 40A? Not many. How about super fast µs rise time between 0A and 20A or between any two current levels? Not heard of. Not until now. Linear Technology’s LT3743 solves the problems of driving up to 40A LEDs with super fast 2µs PWM dimming between any current levels. It drives laser diodes too. The LT3743 does all this at 95% efficiency (12V input, 20A, 5V output) even in the low dimming range. The LT3743 can take up to 36V and can drive LEDs in series. The solution takes less than 2 square inches of PCB space.
Multicell Battery Stack Monitor IC for High Voltage Applications - LTC6803
LTC6803 Multicell Battery Stack Monitor IC for High Voltage Applications
Stacks of lithium ion cells are used in new hybrid electric vehicles and uninterruptible power supplies. Maximizing the life and the safety of these high voltage, high power battery packs depends on sophisticated electronics. Linear Technology’s LTC6803 Multicell Battery Stack Monitor is the key component in a battery management system. The precision, noise immunity, low current modes, and built in diagnostics of the LTC6803 are critical to maintaining the proper state of charge and state of health of every cell. The unique stacking architecture reduces system cost by eliminating isolation components. Comprehensive applications support helps customers quickly integrate the LTC6803 into their products.
60V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC Drives LEDs, Regulates Voltage and Charges Batteries - LT3791
LEDs are becoming both more popular and more powerful. Strings of 1A, 2A, 3A and higher current LEDs found in vehicles, billboards, industrial lighting, and many more applications need to be driven both accurately and efficiently from DC/DC converters. In many cases, a step-up and step-down topology is needed due to the voltage variation of both the LED string and the input source. In this case, a 4-switch synchronous buck-boost controller is the best solution for its efficiency and small circuit size. Linear Technology’s LT®3791 is a buck-boost controller IC that drives LED strings from an input voltage up to 60V to an output voltage up to 60V. It can drive over 100W of LEDs at over 98% efficiency. It smoothly transitions from buck region to buck-boost region to boost region as the relationship between input and output voltage changes. LTCs high-end PWM dimming provides accurate and deep brightness control to the LEDs. Short-circuit and open LED string protection and diagnostics make this a robust and highly useful step-up/step-down LED driver. The LT3791 can operate as both a constant current and constant voltage DC regulator, so it can also be used as an excellent high power buck-boost voltage regulator up to 60V and with short-circuit protection. Both constant current and constant voltage are needed for special sealed lead acid battery chargers and LT3791 has a special 1/10th charger current detection that can be used to switch from a charge voltage to a float voltage for a charged up high power SLA battery.
LTC2945 - Wide Range I2C Power Monitor
The LTC2945 is a rail-to-rail system monitor that mea- sures current, voltage, and power. It features an operating range of 2.7V to 80V and includes a shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. The current measurement range of 0V to 80V is independent of the input supply. An onboard 0.75% accurate 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power value is generated by digitally multiplying the measured 12-bit load current and input voltage data. Minimum and maximum values are stored and an overrange alert with program- mable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. Shutdown mode reduces power consumption to 20µA. The LTC2945 I2C interface includes separate data input and output pins for use with standard or opto-isolated I2C connections. The LTC2945-1 has an inverted data output for use with inverting opto-isolator configurations.
Isolated Flyback Controller with PFC Controls Voltage or Current - LT3798
Linear Technology’s LT®3798 isolated controller with active power factor correction (PFC) is specifically designed for regulating bus voltages or driving constant current applications over a wide input range of 10V to 480V. It is ideal for constant voltage/current applications requiring 4W to over 100W power. The LT3798’s unique current sensing scheme delivers a well regulated voltage or current to the secondary side with no optocoupler. It also offers low harmonic distortion while delivering efficiencies as high as 90%. Output short circuit protection ensures long term reliability and a simple, compact solution footprint addresses a wide range of applications.
LT6016 - Dual/Quad 3.2MHz, 0.8V/µs Low Power, Over-The-Top Precision Op Amp
.Overview Packaging Order Info Simulate Demo Boards Circuits Videos Notifications Tech SupportLT6016 - Dual/Quad 3.2MHz, 0.8V/µs Low Power, Over-The-Top Precision Op Amp Features Input Common Mode Range: V– to V– + 76V Rail-to-Rail Input and Output Low Power: 315µA/Amplifier Operating Temperature Range: –55°C to 150°C VOS: ±50µV (Maximum) CMRR, PSRR: 126dB Reverse Battery Protection to 50V Gain Bandwidth Product: 3.2MHz Specified on 5V and ±15V Supplies High Voltage Gain: 1000V/mV No Phase Reversal No Supply Sequencing Problems Dual 8-Lead MSOP Quad 22-Lead DFN (6mm × 3mm) Typical Application The LT®6016/LT6017 are dual and quad rail-to-rail input operational amplifiers with input offset voltage trimmed to less than 50µV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315µA per amplifier. They are reverse battery protected, drawing very little current for reverse supplies up to 50V. The Over-The-Top® input stage of the LT6016/LT6017 is designed to provide added protection in tough environments. The input common mode range extends from V– to V+ and beyond: these amplifiers operate with inputs up to 76V above V– independent of V+. Internal resistors protect the inputs against transient faults up to 25V below the negative supply. The LT6016/LT6017 can drive loads up to 25mA and are unity-gain stable with capacitive loads as large as 200pF. Optional external compensation can be added to extend the capacitive drive capability beyond 200pF. The LT6016 dual op amp is available in an 8-lead MSOP package. The LT6017 is offered in a 22-pin leadless DFN package.
Offline Isolated Flyback LED Controller with Active PFC - LT3799
The LT®3799/-1 isolated LED controller with active power factor correction (PFC) is specifically designed for driving LEDs over a wide input range of 24V to 480V+. It is ideal for LED applications requiring 4W to over 100W of LED power. The LT3799/-1’s unique current sensing scheme delivers a well regulated current to the secondary side with no optocoupler. The LT3799 is compatible with standard TRIAC in-wall dimmers while the LT3799-1 optimizes line regulation. It also offers low harmonic distortion while delivering efficiencies as high as 90%. Open and short LED protection ensures long term reliability and a simple, compact solution footprint addresses a wide range of applications.
Low Phase Noise Frequency Synthesizers for RF Applications - LTC6945
LTC6945 Low Phase Noise Frequency Synthesizers for RF Applications
In modern RF communication systems, signal integrity is of prime importance. To meet the system requirements, amplifiers, mixers and modulators must have a low noise figure and low distortion products. Additionally, as system designers work to squeeze increasingly more data into the available bandwidth, low phase noise signal sources assume an equal importance. To address this need for low phase noise signal sources, Linear Technology developed the LTC®6945 and LTC6946 Phase Locked Loop (PLL) frequency synthesizers. Both parts deliver a low phase noise PLL core that not only has a low in-band noise floor, but also has a very low 1/f corner with exceptionally low spurious levels. The LTC6945 contains this low noise PLL core and provides inputs for an external VCO. The LTC6946 is a fully integrated frequency synthesizer combining the PLL core with an industry leading, low phase noise VCO. Additionally, the PLLWizard design tool facilitates the synthesizer design, accurately simulates its performance and gets the system up and running quickly. The LTC6945 and LTC6946 frequency synthesizers together with the PLLWizard design tool enables system designers to meet their signal generation requirements quickly with no surprises.
Wide VIN Range Step-Down Regulators Consume Only 2.8µA Input Current - LT3971
Battery life is paramount in modern battery-powered systems. Portable applications, such as remote sensors, require voltage regulators which have low current standby states and also able to provide bursts of high power. Linear Technology’s LT®3970/LT3971 lead the industry in low current standby mode by consuming only 2.8uA of input current when regulating a 3.3V output with no load. These products can provide up to 1.2A and 350mA of output current at high efficiencies from inputs of up to 38V. The LT3970 and LT3971 have quiescent currents less than the self discharge rates of most batteries, so are the best choices for systems with tight power budgets needing full featured step-down regulators.
Isolated RS485 Transceiver with Power in One Small Package - LTM2881
LTM2881 Isolated RS485 Transceiver with Power in One Small Package_h264.JMarvin
The benefits of galvanic isolation extend beyond safety and protection from dangerous voltages to provide error-free communication in the presence of high edge rate transients, noise and high common mode voltage that would otherwise render a non-isolated network inoperative. The new Isolator uModule Technology from Linear Technology provides a complete power and data isolation solution in one small 11.25mm x 15mm x 2.8mm surfacemount package. The LTM2881 incorporates a robust isolated RS485 transceiver and an isolated DC/DC converter capable of delivering up to 1W of power for the transceiver and auxiliary circuits. The module requires no external components – even the decoupling capacitors and an electrically switchable network termination resistor are built in. The ease of use and a small footprint make it more appealing than ever to design isolation into an RS485 network at every communication node.
Virtual Remote Sense - LT4180
LT4180 Virtual Remote Sense
Compensating for unknown wire drops without remote sensing wires is now possible. The LT4180 continuously modulates the power supply output current to interrogate the line drop. Then the output is increased to match the drop providing up to a 50 to 1 improvement in regulation at the load.
How to Design a Complex Switching Regulator as Simple as a Linear Regulator – MicroModules - LTM4601
LTM4601 How to Design a Complex Switching Regulator as Simple_final
There is an alternative solution when deciding between a step-down switching regulator and a linear regulator. Switching regulators dissipate less heat than linear regulators especially when the input voltage is much higher than the output voltage or the output load current is relative high. On the other hand, linear regulators are very simple and don’t require inductors. What if there was a switching regulator circuit could be simplified and fitted inside a surface mount package and the complete solution became as simple as a regulator’s circuit? No inductors, no MOSFETs, no difficult calculations for compensation circuitry. On paper, it is a simple square box with a few resistors and capacitors. On a PCB, it is also a simple square box with a few resistors and capacitors. Linear Technology’s DC/DC µModule® regulators are complete switching regulator systems that are housed in compact surfacemount LGA (land grid array) package. All the complexity is addressed inside the package. What a designer needs to do is to simply choose a resistor to set the output voltage. This innovative regulator solution, allows system designers to save precious engineering time by minimizing the task of devising point-of-load regulators and obtain a complete solution that is encapsulated in a package resembling a surfacemount IC.
Matched Resistor Networks for Ultraprecision Applications - LT5400
LT5400 Matched_Resistor_Networks
Precision matched resistors are used in a wide range of precision instrumentation applications including measurement and data acquisition, wireless RF, networking, automated test, medical, industrial controls and military equipment. The LT®5400 is a family of quad, precision matched resistors designed for high performance signal conditioning applications such as difference amplifiers, precision dividers, precision gain stages, and bridge circuits. These thin-film resistors offer outstanding resistor-to-resistor matching and outstanding long term drift, in a small package. The LT5400 matching is taken one step further with “matching for CMRR,” a new metric that guarantees CMRR performance when configured in a differential circuit. The LT5400’s matching for CMRR is guaranteed to be better than 0.005%, over the full specified temperature range, offering a 2x improvement over resistors matched to within 0.01%.
High Efficiency Dual 13A or Single 26A µModule Regulator - LTM4620
LTM4620 High Efficiency Dual_8-12_Final
Linear Technology's LTM4620 uses a proprietary lead frame design to package high power regulators into a very small form factor with effective thermal conduction through the top and bottom of the µmodule product. The device can be connected in parallel to support higher current applications with very accurate current sharing between the channels.
High Efficiency, Ultralow IQ, 42V, 2.5A Sync Buck Regulator - LT8610
The LT®8610 step-down regulator integrates key high performance features in one compact IC. It offers synchronous rectification, for efficiencies up to 96%. The low quiescent current of 2.5µA extends battery life and saves extra circuitry. High speed switching minimizes board space and helps avoid EMI problems. A low dropout of 200mV at 1A load allows wide VIN range. The LT8610 is a great choice for many step-down applications requiring high input voltages up to 42V and load currents up to 2.5A.
Low Noise µModule DC/DC Converters Simplify EMI Design - LTM8032, LTM8031, LTM8020, LTM8021, LTM4606
LTM8032 Low Noise uModule DC.DC Converters Simplify EMI Design_v5
Electromagnetic interference (EMI)falls into two broad catgories - conducted and radiated. Conducted emissions refers to the noise that is carried on wires or other conductors, while radiated EMI floats through the air. While conducted EMI is certainly problematic, it is radiated EMI that makes design engineers cringe. Linear Technology has developed a line of electromagnetically compatible (EMC) micromodule DC/DC converters. Like other members of the micromodule family, these parts are easy to design and use, but on top of that they have been independently certified to meet the stringent requirements of EN55022 Class B.
Introducing the LT3070 Point-of-Load Regulator for FPGA & Server Backplanes - LT3070 Intro The LT3070
Modern FPGAs and servers operating at low voltages are sensitive to subtle supply drops. The droop may result from a combination of excess regulator noise, insufficient bandwidth in the supply regulator, excess ESR & ESL in the decoupling components, or distributed inductance in the power distribution. To abate the risk of supply droop the typical approach is to surround the processor with an assortment of ceramic and bulk capacitors, thereby lending broadband support to the supplies with capacitors. This consumes board area and component budget. Linear Technology’s LT3070 is a POL regulator designed for FPGA & server applications. The LT3070 commands high bandwidth and fast transient performance by providing lower output impedance than bulk capacitors, thus eliminating the need for bulk capacitors. With the LT3070, the distributed decoupling network is reduced to just a few small ceramic capacitors. The high bandwidth combined with a 25uVRMS noise floor, make the LT3070 the fastest, quietest, lowest dropout, and most cost effective 5A monolithic linear regulator in the industry.
The Simple Way to Match to a High-Speed ADC Input - LTM9001 - LTM9001
LTM9001 The Simple Way to Match to a High-Speed ADC Input
High-speed, high-resolution ADCs are critical components in communications and instrumentation applications. The interface between the final amplifier of the signal chain and the input pins of the ADC is challenging and time-consuming. Yet it is critical to the performance of the entire system. Traditionally, this requires impedance matching, developing an anti-alias filter and multiple iterations of the board layout to get everything right. Linear Technology’s LTM9001 greatly simplifies this part of the signal chain design. The ADC, the amplifier, all of the bypass capacitors and especially the matching and filter network are all integrated.
Simple and Efficient Sub-2W Isolated Power Supply - LT8300
The non-synchronous flyback topology is widely used in isolated power supplies ranging from sub watt power levels to tens of watts. With more green-mode standards emerging around the world, improving light load efficiency and reducing no-load input standby current are more demanding than ever. Unfortunately, the traditional isolated power supplies using optocouplers can no longer achieve the performance requested. The new LT®8300 builds a 5V/300mA low IQ isolated power supply from a 36V to 72V input with only five external components (input capacitor, output capacitor, transformer, feedback resistor and output diode). Without skimping any performance, the simple LT8300 solution achieves 85% peak efficiency, less than 250µA no-load input standby current, ±1% output load and line regulation, less than 50mV peak-to-peak output voltage ripple and well-behaved transient and startup performance.
LTpowerCAD - A Complete Switching Regulator Design Tool
LTpowerCAD A Complete Switching Regulator Design Tool for LTC's uModule and Monolithic
Switching power supply design can often be a challenging and time-consuming experience. Typically this requires knowledge of aspects such as control loop compensation, IC operation and capabilities, filtering and even power loss mechanisms related to DC/DC switching regulators. The LTpowerCAD design tool provides recommendations for component values and performance estimates specific to the user’s application with Linear Technology’s µModule and monolithic DC/DC regulator products. This guides the user through the entire design process reducing design effort and speeding up design time.
80V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC with 4 Regulation Loops - LT8705
LT8705 80V_LT8705_11-12_v2
In today’s modern electronic systems, the need for power conversion circuits that can do more then simply convert one voltage to another is growing. Some systems require a constant current, constant voltage output, while others may require a limit on the maximum current that can be drawn from the input. Still others may require the power conversion chip to be interfaced to a micro-controller so that other parameters can be both measured and controlled. All of these requirements are in addition to the normal requirements of very high conversion efficiency and high operating voltage ranges. Linear Technology’s LT®8705 is a buck-boost controller IC with 4 regulation loops which can operate from an input voltage up to 80V and generate an output voltage up to 80V. The LT8705 can operate with input voltages above, equal to, or below the desired output voltage and do so while achieving over 98% conversion efficiency. It smoothly transitions from buck region to buck-boost region to boost region as the relationship between input and output voltage changes. The integrated strong gate drivers allow a single LT8705 circuit to process up to 250 Watts of power. The LT8705 has 4 regulation loops built in. These loops can be set up to regulate output voltage, output current, input current and input voltage. Any combination of these loops can be used in a given system. Status pins can be used to indicate which loop or loops are active at a given moment. The LT8705 also includes a built in linear regulator, useful for powering other loads such as a micro-controller.
Measuring Switching Regulator Noise
Measuring Switching Regulator Noise Williams_final
The universal application of switching regulators, combined with the powered systems potential for supply noise sensitivity, mandates the need for a reliable noise measurement technique. Actually, switching regulator "noise" isn't really noise at all, but coherent, high frequency residue directly related to the regulators switching. This residue, composed of fundamental switching frequency ripple and wideband harmonic, is the measurand. Typically, amplitudes of 100µV to 10mV in a 100MHz bandwidth are of interest. This video presents a technique for measuring this "noise", verifies the method to insure meaningful results and concludes with a laboratory demonstration.
Instrumentation Applications for High Accuracy Temperature Monitor Products - LTC299x
LTC299x Instrumentation Applications for High Accuracy Temperature Monitor Products
Thermal management is a critical part of system design. FPGAs and processors often require heat sinks and fans, to the extent that a failure (stopped fan or obstructed heat sink) would cause damage. These devices often have a pin connected to an on-die diode temperature sensor. It is also useful to know the temperature of other points on a board to monitor system health. Linear Technology’s family of temperature monitor products addresses these applications by allowing a generic diode-connected transistor to be used as a 1°C accurate temperature sensor. This level of accuracy also opens up instrumentation applications, such as cold-junction compensation of large arrays of thermocouples, HVAC and environmental monitoring.
Precision Current Monitoring for Electric Motors, Solenoids and Inductive Loads
Precision Current Monitoring for Electric
Current information in electric motors and solenoids provides important insight into power output and system health. Electric motor and solenoid driving circuits and the devices themselves create a challenging environment for operation of current monitoring circuits, with large common mode voltage shifts, fast switching currents and large voltage spikes. Many traditional circuits used to monitor current have difficulty rejecting the switching voltages and noise. The LT1999 was designed to be easily designed into these tough environments, rejecting circuit noise and providing accurate current information.
Versatile, Easy to Use, Accurate Timing Building Blocks - LTC699x
LTC699X Versatile Easy to Use Accurate Timing Building Blocks_v3
TimerBox devices are novel solid state timing devices for voltage-controlled oscillation (VCO), low frequency clocking, pulse-width modulation (PWM), one-shot generation and signal delays. In this video, learn how these simple, small and accurate devices offer a new approach to common timing applications.
38V, 10A DC/DC µModule® Regulator with Fault Protection Powers High-End ASICs and FPGAs - LTM4641
Pulsed loading conditions and abnormal disturbances within the electrical systems found in industrial, vehicle, avionic and other harsh environments can induce wildly varying voltage transients (surges) on what is nominally a 24VDC or 36VDC distributed bus. The disturbances can be between a millisecond to a minute in length, with excursions reaching (or exceeding) 38V and falling below 6V. The severity rating often becomes more of a concern at higher input voltages. The LTM4641 challenges this notion by protecting the load from seeing excessive voltage stress, even when its high side switching MOSFET is short-circuited. The LTM®4641 is a 10A switch mode step-down DC/DC µModule® regulator with advanced input and load protection features. Trip detection thresholds for the following faults are customizable: input undervoltage, overtemperature, input overvoltage and output overvoltage. Fault conditions can be set for latchoff or hysteretic restart response—or disabled. Included in the package are the switching controller and housekeeping ICs, power MOSFETs, inductor, overvoltage drivers, biasing circuitry and supporting components. Operating from input voltages of 4V to 38V (4.5V start-up), the device supports output voltages from 0.6V to 6V, set by an external resistor network remote sensing the point-of-load’s voltage.
Reduce Digital Feedback in High Speed Data Conversion Systems - LTC2261
LTC2261 Reduce Digital Feedback in Data Conversion Systems Speed
Linear Technology's newest high-speed ADC family achieves one third the power consumption of existing solutions without compromising AC performance. Operating from a low 1.8V supply, the 14-bit, 125Msps LTC2261 dissipates 125mW while maintaining 73.4dB SNR and 85dBc SFDR. Digital outputs can be configured as DDR CMOS, DDR LVDS or standard CMOS for minimizing FPGA pin count. An optional alternate bit polarity mode is provided to reduce the effects of digital feedback. The LTC2261 can also be used with an LTC6406 differential amplifier to provide a low power ADC + driver solution. Together, they dissipate 186mW and provide excellent AC performance.
Battery stack monitor measures from -300 mV to 5 V
LTC battery measurement system
The LTC6803 Battery Management System measures up to 12 individual battery cells in series
Achieve 101dB SNR with the LTC2379-1
LTC2379-18 Achieve_101dB_SNR_03-12
Successive Approximation Register Analog-to-Digital Converters (SAR ADCs) are key components in instrumentation, industrial control, and test equipment applications. The accuracy, noise and speed of the SAR ADC often determine the overall system performance. Linear Technology’s LTC®2379-18 breaks new ground in SAR ADC technology, achieving 18-bit performance at 1.6Msps with 101dB SNR. In this video presentation, a designer of the LTC2379-18 demonstrates the outstanding performance of the device and shares his insights into the sophisticated design of this 18-bit ADC.
Linear Technology-LT3743 LED driver
LT3734 LED driver
Talk with Bryan Legates, Design Engineering Manager Power Products, about the synchronous step-down LED driver.