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Solutions Search - Power Management

Dual Channel 42V, 4A Monolithic Synchronous Step-Down Silent Switcher 2 with 6.2μA Quiescent Current

Walker Bai - Applications Enginneer Nov 14th 2017
Design Note DN10477: Introduction The LT®8650S 42V, dual channel, 4A, synchronous Silent Switcher®2 regulator features a wide input voltage range of 3V to 42V, ideal for automotive, industrial and other stepdown applications. Its quiescent current is only 6.2μA, with the outputs in regulation, a critical feature ...

Blog Post LTspice 

 

Cool Running, 144W, 4 × 40A μModule POL Regulator

Afshin Odabaee - Business Manager - uModule Power Products
Yan Liang - Applications Engineer
Oct 24th 2017
Design Note DN569: Introduction The LTM®4636 is a 40A-capable μModule® regulator featuring 3D packaging technology, or component-on-package (CoP) to keep it cool—see Figure 1. The body of the device is an overmolded 16mm × 16mm × 1.91mm BGA package with an inductor stacked on top to expose it to ...

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60V 2MHz Buck-Boost Controllers Regulate High Power Voltage and Current with High Efficiency and Low EMI

Keith Szolusha - Applications Engineering Section Leader Aug 24th 2017
Design Note DN567: Introduction Synchronous buck-boost controllers are versatile and highly efficient. They can produce high power as both a boost and a buck with a single inductor, keeping power supply design simple. Normally, a buck-boost controller in a high power application is operated at a standard or low switching frequency, ...

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Simple Power Backup Supply for a 3.3V Rail

Victor Khasiev - Applications Engineer Aug 8th 2017
Design Note DN565: Introduction Data loss is a concern in telecom, industrial and automotive applications where embedded systems require a dependable supply of power. Sudden power interruptions can corrupt data during read and write operations performed by hard drives and flash memory. Designers often use batteries, capacitors ...

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High Efficiency Solar MPPT Battery Charger Using LT8611 and AD5245

Perry Faubert - FAE Jul 10th 2017
Introduction Outdoor applications that use solar panels in the range of a few watts often use a microcontroller-based MPPT (Maximum Power Point Tracking)  function to extract the maximum power available over the full range of environmental operating conditions. Many microcontroller-based MPPT solutions designed for ...

Blog Post LTspice 

 

Low EMI Power Solutions and Electromagnetic Compatibility (EMC) Standards

Kevin B. Scott - Senior Strategic Marketing Engineer May 30th 2017
Low EMI Solutions and ElectromagneticCompatibility (EMC) Standards Many Linear Technology Power Products are compliant to a specific electromagnetic compatibility standard. The most commonly referenced standards are EN 55022, CISPR 22 Class B, FCC Part 15 Class B, and CISPR 25. When testing a power solution, there ...

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No-Opto Flyback DC/DC Converters & Snubber Protection Circuits

Kevin B. Scott - Senior Strategic Marketing Engineer
George Qian - Senior Applications Engineer
May 2nd 2017
Flyback Solutions The flyback DC/DC converter topology is one of several topologies that allow the input voltage to be above or below the output voltage. The SEPIC and buck-boost topologies also allow this, but there are times when a flyback is the more desirable solution: namely when isolation is required (for noise immunity ...

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Wireless Current Sense Circuit Floats with Sense Resistor

Kris Lokere - Strategic Applications Manager Apr 25th 2017
Introduction Measuring the current that flows through a sense resistor seems easy. Amplify the voltage, read it with an ADC, and now you know what the current is. But it gets more difficult if the sense resistor itself sits at a voltage that is very different from system ground. Typical solutions bridge that voltage difference ...

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60V Low IQ, Dual Output Synchronous Step-Down Controller with Adjustable Gate Drive

Victor Khasiev - Applications Engineer Mar 31st 2017
Design Note 562: Introduction The LTC®3892 is a dual output synchronous buck controller featuring a wide input voltage range of 4.5V to 60V and an output voltage of 0.8V to 99% of VIN. The combination of the LTC3892’s built-in FET drivers and external FETs yield high efficiency and high power capability, up to 97% ...

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LT8310/LT1431 92W Isolated Forward Converter with Opto Feedback; VIN = 48V, VOUT = 54V@1.7A

George Qian - Senior Applications Engineer Mar 29th 2017
The LT8310 is a constant-frequency resonant reset forward converter controller with a low side N-channel MOSFET gate driver. The LT8310 has a wide input voltage range from 6V to 100V. Its switching frequency can be programed from 100kHz to 500kHz to optimize efficiency, performance or external component size. The LT8310’s ...

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Low Noise Power Supplies Come in Many Flavors: Part 3 - Buck Converters

Kevin B. Scott - Senior Strategic Marketing Engineer
Tim Sourdif - Senior Design Engineer
Mar 23rd 2017
In Part 1 of the series, we looked at linear regulators for lowest output noise performance. In Part 2, charge pump solutions with integrated post linear regulators we highlighted. In these previous examples, circuit efficiency was a lower priority. But what if low output voltage noise and high efficiency are both desired? ...

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Low Noise Power Supplies Come in Many Flavors: Part 2 - Charge Pump Solutions

Kevin B. Scott - Senior Strategic Marketing Engineer
Amit Lele - Senior Design Engineer
Mar 23rd 2017
Charge pump solutions are often thought to be too noisy for low noise applications. Engineers associate charge pump power supplies with peak-to-peak noise levels in the 20mV to 200mV range. Linear Technology's latest family of regulated charge pump plus linear regulator power supply solutions are inductorless, small size, low ...

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Low Noise Power Supplies Come in Many Flavors: Part 1 - Linear Regulators

Kevin B. Scott - Senior Strategic Marketing Engineer Mar 23rd 2017
(In this three part series, we look at low noise portable power supplies using different topologies. Using a low noise linear regulator is a no-brainer for many of these applications, but in applications where a linear regulator may not be desired (due to efficiency, power dissipation or other constraints), low noise solutions ...

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High Voltage, High Efficiency Positive to Negative Converter

Victor Khasiev - Applications Engineer Mar 8th 2017
Design Note 561: Introduction Positive to negative conversion (inverting output) is widely used in LCD devices, OLED displays, audio amplifiers, industrial machinery, semiconductor manufacturing process control equipment, measurement tools, testing systems, LED drivers and battery chargers. Many of these applications require ...

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Maximizing Cell Monitoring Accuracy and Data Integrity in Energy Storage Battery Management Systems

Mike Kultgen - Design Director
Greg Zimmer - Senior Product Marketing Engineer
Jan 24th 2017
Grid-connected battery arrays are viable backup and carry-through power sources; application-specific measurement ICs which meet their unique and sophisticated requirements ensure reliable system performance. The use of large-scale battery arrays for backup and carry-through energy storage is getting increasing attention, as ...

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High Efficiency, 15V Rail-to-Rail Output Synchronous Step-Down Regulator Can Source or Sink 5A

Tim Kozono - Applications Engineer Jan 23rd 2017
Design Note 560: Introduction The LTC®3623 is a high efficiency, monolithic synchronous step-down regulator capable of sourcing or sinking up to 5A of continuous output current from an input voltage range of 4V to 15V. Its compact 3mm × 5mm QFN package incorporates an abundance of features including a low EMI Silent ...

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Switch Mode Power Supply Current Sensing - Part 3: Current Sensing Methods

Henry Zhang - Applications Engineering Manager
Kevin B. Scott - Senior Strategic Marketing Engineer
Nov 22nd 2016
The three commonly employed current sensing methods for switch mode power supplies are: are using a sense resistor, using the MOSFET RDS(ON) and using the DC resistance (DCR) of the inductor. Each method offers advantages and disadvantages that should be considered when selecting one method over another.  Sense Resistor ...

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Switch Mode Power Supply Current Sensing - Part 1: The Basics

Henry Zhang - Applications Engineering Manager
Mike Shriver - Senior Applications Engineer
Kevin B. Scott - Senior Strategic Marketing Engineer
Nov 20th 2016
Current mode control is widely used for switching mode power supplies due to its high reliability, simple loop compensation design, and simple and reliable load sharing capability. The current sense signal is an essential part of a current mode switch mode power supply design; it is used to regulate the output and also provides ...

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60V Input Monolithic Converter Powers Critical Circuits without Supercaps or Other Additional Components

Victor Khasiev - Applications Engineer Nov 15th 2016
Design Note DN1040: Introduction The LTC3649 is a monolithic step-down regulator capable of operating from an input voltage range of 3.1V to 60V, and efficiently producing a (single) resistorprogrammable output voltage at up to 4A of output current. These features alone make it a compelling industrial or automotive supply for ...

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Bidirectional DC/DC Regulator and Supercapacitor Charger

Victor Khasiev - Applications Engineer Nov 15th 2016
Design Note DN558: Introduction The LTC®3110 bidirectional buck-boost DC/DC regulator charges and balances a supercapacitor when a bus voltage is present (for example 3.3V) and discharges the supercapacitor into the load when the bus fails. The LTC3110 maintains the bus’s nominal level (3.3V in the example in Figure ...

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Hybrid Wide Dimming Ratio Linear LED Current Controller Using LT8614 & LT3083/LT6015

Tom Mosteller - Field Applications Engineer Oct 17th 2016
Many applications for LED illumination require wide dimming ratios. This can be accomplished simply via an adjustable current source as show below.  The current source can be varied by a number of different means, and a large LED current range can be achieved. The primary problem with this technique is that the power dissipation ...

Blog Post Circuit LTspice 

 

Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting

Keith Szolusha - Applications Engineering Section Leader Oct 12th 2016
Design Note DN557: Introduction The breadth of LED applications has grown to encompass everything from general lighting to automotive, industrial and test equipment, sign boards and safety instruments. Feature requirements for LED drivers have become more extensive. The latest LED solutions require drivers that are compact, ...

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Clever Circuit Improves Efficiency of Charge Pump Plus Linear Regulator Solution

Martin Merchant - Sr. Applications Engineer
Kevin B. Scott - Senior Strategic Marketing Engineer
Oct 4th 2016
In some systems, a charge pump plus linear regulator combination is preferred over an inductor-based switching power supply (with or without a post-regulating linear regulator) for several reasons: design simplicity, less radiated EMI, inductor-phobia, etc. For these applications, Linear Technology has a growing number ...

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3A, 1MHz Buck Mode LED Driver with Integrated Voltage Limiting

Matthew Grant - Sr Design Eng Oct 3rd 2016
Design Note DN556: Introduction The LT3952 monolithic LED driver includes a 4A, 60V DMOS power switch, excellent for driving high current LEDs in buck mode. Among its many features is an input current sense amplifier, which can be leveraged to provide built-in LED voltage limiting in buck mode.   In buck mode, the ...

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LT3759 Wide Vin, 48V @ >100mA Output Boost Converter that Works Down to 1.6V

Christopher Jarboe - Associate Applications Engineer Oct 3rd 2016
The LT®3759 is a wide input range, current mode, DC/DC controller which is capable of regulating either positive or negative output voltages from a single feedback pin. It can be configured as a boost, SEPIC or inverting converter. An internal LDO regulator draws power from VIN or DRIVE to provide up to a 4.75V supply for ...

Blog Post Circuit LTspice 

 

How NOT to Damage Your Switching Regulator Demo Board

Christopher Jarboe - Associate Applications Engineer Sep 2nd 2016
Introduction: A great way to develop a design is to start with an existing demo board and modify it. While this simplifies the process, there are a few pitfalls to be aware of so that you do not have to spend time tracking down and replacing damaged components. Below are four common ways to damage your circuit. 1) Improper ...

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Active Battery Cell Balancing

Kevin B. Scott - Senior Strategic Marketing Engineer
Sam Nork - Boston Design Center Manager
Aug 18th 2016
With passive and active cell balancing, each cell in the battery stack is monitored to maintain a healthy battery state of charge (SoC). This extends battery cycle life and provides an added layer of protection by preventing damage to a battery cell due to deep discharging over overcharging. Passive balancing results in all ...

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Passive Battery Cell Balancing

Kevin B. Scott - Senior Strategic Marketing Engineer
Sam Nork - Boston Design Center Manager
Aug 18th 2016
In the automotive and transportation marketplace, large battery stacks provide high output power without producing harmful emissions (i.e. carbon monoxide and hydrocarbons) associated with gasoline-powered combustion engines. Ideally, each individual battery in the stack equally contributes to the system. However, when ...

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6A Monolithic Synchronous DC/DC Step-Down Converter with Digital Power System Management

Haoran Wu - Applications Engineer Aug 10th 2016
Design Note 554: Introduction Digital Power System Management (PSM) controllers usually target high current point-of-load (POL) applications. Lower current applications, with up to 6A load current, can also benefit from PSM features. The LTC®3815 is a 6A monolithic synchronous stepdown converter with digital power monitoring ...

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Electrolytic Capacitor-Based Data Backup Power Solution for a 12V System Regulated from 5V to 36V Input

Victor Khasiev - Applications Engineer Jul 5th 2016
Design Note 553: Introduction Data loss is a concern in telecom, industrial and automotive applications where embedded systems depend on a consistent supply of power. Sudden power interruptions can corrupt data during read and write operations for hard drives and flash memory. Often, embedded systems need just 10ms to 50ms ...

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95% Efficient at 2MHz 42V Sync Buck

Jun 24th 2016
Linear Technology’s family of high voltage synchronous step-down DC/DC switching regulators offer up to 95% efficiency. Switching at 2MHz, these low EMI parts utilize the Silent Switcher technology. Other features include spread spectrum frequency modulation, ultra-low quiescent current and are available with single, dual, ...

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No-Opto Isolated Flyback Converters

Jun 10th 2016
The no-opto isolated flyback parts from Linear need no opto-coupler or LT1431 shunt regulator for regulation. They sense the isolated output voltage directly from the primary-side waveform. This simplifies the design, allows for a smaller solution size and only requires one component crossing the isolation barrier. The load, ...

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Inverting Regulator Takes Inputs Up to 50V and Supports Outputs to 4A

Victor Khasiev - Applications Engineer May 25th 2016
Design Note 552: Introduction Positive-to-negative DC/DC conversion (inverting output) is widely used in LCD devices, OLED displays, audio amplifiers, industrial equipment, measurement tools, test systems, LED drivers and battery chargers. In all of these cases, the inverting converter must be compact, support high power and ...

Blog Post LTspice 

 

Common Questions About the LTC2668 Family of 16bit VOUT DACs

Mark Thoren - Staff Scientist
Chad Steward - Design Manager
Noe Quintero - Application Engineer
Apr 19th 2016
The LTC2668-16 packs 16, 16-bit high performance Digital to Analog converters (DACs) into a tiny, 6x6mm QFN package, with 8 and 4 channel versions in a 5x5 QFN, and 12-bit versions for lower resolution applications. A general purpose DAC such as this finds its way into a myriad of diverse applications, and tends to generate ...

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Ultrathin Triple Output μModule Regulator for DDR, QDR and QDR-IV SRAM Fits 0.5cm2 Area and Backside of PCB

Afshin Odabaee - Business Manager - uModule Power Products
Sam Young - Applications Engineer
Apr 18th 2016
Design Note 551: Introduction Delivering the highest RTR (random transaction rate) of QDR (quad data rate) SRAMs, QDR-IV provides up to 400Gbps data transfer for high bandwidth networking, high performance computing and intensive data processing applications. A key challenge at these faster data rates is maintaining the integrity ...

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60V, 4A Synchronous Monolithic Step-Down Regulator Has Rail-to Rail Operation

Apr 5th 2016
Design Note 550: Introduction The LTC3649 is a high efficiency synchronous monolithic step-down regulator, which integrates top and bottom N-channel MOSFETs on the die. This regulator features a wide input voltage range, 3.1V to 60V, and a wide output voltage range from 0V to (VIN − 0.5V). This extremely wide range of ...

Blog Post LTspice 

 

AN159: Measuring 2nV/√Hz Noise and 120dB Supply Rejection on Linear Regulators - The Quest for Quiet

Apr 4th 2016
AN159: Introduction A quiet, well regulated supply is important for optimum performance with a number of circuit applications. Voltage controlled oscillators (VCOs) and precision voltage controlled crystal oscillators (VCXOs) respond to small changes in their supply very quickly. Phase-locked loops (PLLs) require a stable supply ...

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LTSpice: Plotting a Parameter Against Something Other Than Time (e.g. Resistance)

Joseph Spencer - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Mar 25th 2016
A common use for LTSpice® is to run a time domain transient analysis where a parameter (e.g. voltage or current) can be plotted against time. Occasionally, you may wish to know the behavior of a circuit versus another parameter such as resistance. This can be done by using the “.measure” and “.step” ...

Blog Post LTspice 

 

A New Era in Space Products - Radiation Tolerant

T.J. Fure - Product Marketing Manager
Gabino Alonso - Strategic Marketing Engineer
Mar 23rd 2016
Recent developments have made doing business in space ever more achievable to a broadening base of companies. A market previously consisting solely of major defense contractors and national governments has been disrupted by a growing list of commercial companies determined to deploy an enterprise beyond the confines of our terrestrial ...

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Differences Between the Ćuk Converter and the Inverting Charge Pump Converter

Kevin B. Scott - Senior Strategic Marketing Engineer
Jesus Rosales - Applications Engineer
Mar 7th 2016
The Ćuk converter (also referred to as the two inductor inverting converter), the inverting charge pump and the single inductor inverting converter (also referred to as the inverting buck-boost) all provide a negative output voltage from a positive input voltage. However, engineers often unknowingly refer to these topologies ...

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Powering Altera Arria 10 FPGA and Arria 10 SoC: Tested and Verified Power Management Solutions

Afshin Odabaee - Business Manager - uModule Power Products Feb 19th 2016
Design Note DN549: Introduction FPGA development kits allow system developers to evaluate an FPGA without having to design a complete system. Figures 1 and 2 show Altera’s new 20nm Arria 10 FPGAs and Arria 10 SoCs (System-on-Chip) development boards. These boards are tested and verified by Altera, exemplifying best design ...

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High-Voltage Amplifier Extends Coulomb Counter Range to +/-270V

Kris Lokere - Strategic Applications Manager Jan 22nd 2016
Introduction A coulomb counter can measure charge that flows into or out of a battery. Small, dedicated devices such as LTC2941 or LTC2943 can directly interface with low to medium battery voltages, up to about 20V. You can extend the input operating range of the measurement circuit by using a high-voltage amplifier as a level ...

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Shutdown with the LT3080x Current Source Reference Linear Regulators

Kevin B. Scott - Senior Strategic Marketing Engineer
Tony Bonte - Design Manager
Jan 21st 2016
Current Source Reference Linear Regulators In many low noise applications, a linear regulator is an ideal solution for the power conversion due to its very low output voltage noise and low electromagnetic noise generation (compared to a charge pump or a switching regulator). The LT308x linear regulator family is ideal for these ...

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VID Controller with Phase Extender Provides 120A Power Supply for Latest Generation of FPGAs, ASICs and Processors

Mike Shriver - Senior Applications Engineer Jan 12th 2016
DN547: Introduction The current drawn by FPGAs, ASICs and processors for high performance servers, network and computing systems continues to rise, and load currents of 100A or greater are becoming common. Meanwhile, the chip's operating voltages are dropping to 0.9V and below with tighter voltage regulation requirements. For ...

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42V High Power Density Buck Regulators in a Tiny QFN Package

Ying Cheng - Sr Apps Eng Dec 7th 2015
Design Note 1038: Introduction Power dissipation is a significant problem facing the designers of DC/DC converters in industrial and automotive applications, where high currents are required, but space is limited. It is possible to produce a highly efficient regulator from high performance discrete components, but expense and ...

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Ultrathin Dual 2.5A or Single 5A μModule Regulator Fits on the Backside of PCBs, Allowing Space on the Topside for Digital ICs

Afshin Odabaee - Business Manager - uModule Power Products
Sam Young - Applications Engineer
Nov 23rd 2015
Design Note 546: Introduction The top side of a typical system board, such as a PCIe card, is densely populated with FPGAs/ASICs/ microprocessors, transceivers, connectors, memory ICs and DC/DC regulators, while the backside is often unused. This is a common side effect of the significant difference in top vs back side height ...

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Monolithic Converter Delivers High Output Voltages

Jesus Rosales - Applications Engineer Nov 4th 2015
Design Note 545: Introduction Industrial, telecom, medical and automotive applications use a wide variety of regulated voltages to operate effectively, including high voltage and negative rails. When the designer is faced with producing industrial power supplies, the job can be simplified by minimizing the parts count, as well ...

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Spread Spectrum Frequency Modulation Reduces EMI

Kevin B. Scott - Senior Strategic Marketing Engineer
Greg Zimmer - Senior Product Marketing Engineer
Nov 4th 2015
Electromagnetic Radiation (EMR), Electromagnetic Interference (EMI) and Electromagnetic Compliance (EMC) are terms that pertain to energy from electrically charged particles and the associated magnetic fields that can potentially interfere with circuit performance and signal transmissions. With the proliferation of wireless ...

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Easily Boost 12V to 140V with a Single Converter IC

Victor Khasiev - Applications Engineer Sep 28th 2015
Design Note 1033: Introduction Generating a high voltage from a much lower voltage presents a number of challenges for the classical single stage boost topology. For instance, the maximum duty cycle limitation of a boost controller may not allow the required step-up ratio. Even if it does, there is often a sharp decrease in ...

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42V Quad Monolithic Synchronous Step-Down Regulator with 30μA Quiescent Current

Zhongming Ye - Applications Engineer Sep 21st 2015
Design Note 544: Introduction Industrial and automotive applications require robust, easy-to-use, compact DC/DC converters to produce a variety of low voltage power supplies. The LT8602 monolithic quad synchronous step-down converter in a 6mm × 6mm package is capable of providing four outputs from a wide input range of ...

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Signal Level Shifting with μModule Regulator for Positive-to-Negative Inverting Appliications

Sam Young - Applications Engineer Sep 3rd 2015
Introduction Linear μModule regulators are perfect for point-of-load supplies because their easy-to-drop-in, compact, all-in-one design. They fit tight spaces with minimal engineering effort—only a few components are required in addition to the µModule package itself. Any step-down µModule ...

Blog Post LTspice 

 

Positive to Negative Converter with Variable Output Using LTC3630 and LT6015/LT6016

Philip Lane - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Sep 1st 2015
There was a window of time in the 1950s and early ’60s when negative voltage rails were commonplace, when germanium PNP transistors were prevalent—like those used in an old “transistor radio”, now worth a fortune on Ebay. Nowadays, NPN transistors are more prevalent, since they basically work ...

Blog Post Circuit LTspice 

 

Data Backup Solution for 1mm, Low Profile Industrial Applications

Victor Khasiev - Applications Engineer Aug 25th 2015
Introduction Data backup and retention during a power interruption is required in a wide variety of industrial and automotive applications, where emergency backup power supplies (such as a UPS) may be unfeasible. For example, a vehicle may need to transmit geographical coordinates and the vehicle ID during an abrupt battery ...

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Robust 140V VIN, 400mA Step-Down Regulator for Industrial, Telecom and Automotive Environments

Mike Shriver - Senior Applications Engineer Aug 20th 2015
Design Note 543: Introduction The LTC®7138 is a 400mA step-down regulator that can operate over an input voltage range of 4V to 140V, ideal for industrial, telecom, automotive and other applications subject to harsh line transients. Due to the regulator’s hysteretic architecture, no external compensation is required. ...

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Increasing Output Current of the Ultralow Noise, Ultrahigh PSRR LT3042 200mA Linear Regulator

Kevin B. Scott - Senior Strategic Marketing Engineer
Amit Patel
Dawson Huang
Aug 17th 2015
The LT0342 is a 200mA, 1.8V to 20V input, linear regulator that targets low noise RF and wireless circuits. It features an industry-leading 0.8µVRMS output noise (10Hz to 100kHz) and an impressive 79dB PSRR at 1MHz. Several customers have asked for ways to increase the current above 200mA while still maintaining low noise ...

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Dual 9A, Step-Down μModule Regulator with Digital Power System Management

Jian Li - Applications Engineering Section Leader
Yingyi Yan - Application Engineer
Marvin Macairan - Associate Applications Engineer
Jul 16th 2015
Design Note 542: Introduction The LTM4675 is a dual 9A or single 18A step-down μModule® (micromodule) DC/DC regulator featuring remote configurability and telemetry monitoring of power system management (PSM) parameters over PMBus—an open standard I2C-based digital interface protocol. Its 6mm × 11.9mm × ...

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36V Input, 8.5A Buck-Boost μModule Regulator Easily Parallels for Increased Power

Andy Radosevich - Applications Engineer Jun 16th 2015
Design Note DN540: Introduction The LTM®8055 is a buck-boost μModule® regulator with a 5V to 36V input range that can be easily paralleled to extend load current capability. Its 4-switch buck-boost topology features high efficiency while allowing the input voltage to be below, at or above the output—with smooth ...

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Paralleling Linear Regulators Made Easy

Kevin B. Scott - Senior Strategic Marketing Engineer May 21st 2015
Linear regulators provide a simple, low noise solution for dc-dc regulation. However, at higher Vin-Vout differentials the low efficiency and high power dissipation of linear regulators limits the ammount of output current that can realistically be delivered.  Connecting multiple linear regulators in parallel spreads the ...

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Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer

Jim Drew - Sr Apps Engineer Apr 14th 2015
Design Note DN539: Introduction The LTC®3305 is a lead-acid battery balancer that uses an auxiliary battery or an alternative storage cell (AUX) to transfer charge to and from individual batteries within a series-connected stack. The balancer controls external NMOS switches to sequentially connect the auxiliary battery ...

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Buck-Boost μModule Regulator's External Current Sense Resistor For Paralleling ICs, Current Sharing and Overcurrent Protection

Kevin B. Scott - Senior Strategic Marketing Engineer Mar 17th 2015
Linear Technology's µModule 4-switch buck-boost regulators provide an integrated, high-efficiency solution for applications where the input voltage can be either above or below the desired output voltage. These fixed frequency, current mode devices require only a few external components to provide a minimal design ...

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Linduino PSM

Michael Jones - Applications Engineer Mar 12th 2015
While many engineers use a dongle and tools to configure Power System Management devices via PMBus, a growing number of designs are adding Board Management Controllers, or connecting their PMBus to an existing microcontroller or application processer. At LTC, the dongle/tool option is comprised of a DC1613 and LTpowerPlay, and ...

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LTC3890 & LTC4000 60V Input DC/DC Power Supply with Battery Backup

Victor Khasiev - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Feb 27th 2015
Introduction Circuitry presented in this article can be very useful for designing compact power supplies and extremely beneficial for system functioning in conditions of input power interruptions. The presented solution can be embedded into uninterruptible power systems or small standalone modules. It can be successfully employed ...

Blog Post Circuit LTspice 

 

LT3753 9V-15V Input to 54V/3A Isolated Forward Converter

Randyco Prasetyo - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Feb 26th 2015
The LT®3753 is a primary side, current-mode PWM controller optimized for an active clamp forward converter topology. It features a programmable volt-second clamp that provides a duty cycle guardrail to limit primary switch reset voltage and prevent transformer saturation during load transients. The LT3753 also features ...

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LTC3810 - High Efficiency Switching Surge Stopper

David Burgoon - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Feb 23rd 2015
The LTC®3810 high efficiency input limiter protects its load from excessive input voltage. At normal input voltages (<60V), it operates open loop at a very high duty cycle (>95%) to pass the input to the output at up to 5A with minimal voltage drop. When the input rises to an undesirable point (up to 75V), the ...

Blog Post Circuit LTspice 

 

17V Input, Dual 1A Output Synchronous Step-Down Regulator with Ultralow Quiescent Current

Haoran Wu - Applications Engineer Feb 13th 2015
Design Note DN537: Introduction The LTC®3622 dual 1A synchronous monolithic stepdown regulator enables compact, high efficiency supplies for battery powered systems and portable devices as well as general purpose point-of-load regulation. The tiny 14-pin, 3mm × 4mm DFN package takes input voltages from 2.7V to 17V, ...

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LT3752/LT8311 48Vin, 24Vout Active Clamp Forward Converter with High Light Load Efficiency

Fei Guo - Apps Engineer
Gabino Alonso - Strategic Marketing Engineer
Feb 11th 2015
The LT3752 includes a number of programmable features that make it suitable for this application. For instance, programmable delays between various gate signals is used to prevent cross-conduction and to optimize efficiency, and programmable turn-on current spike blanking (adaptive leading edge blanking plus programmable extended ...

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LT3798/LT8309 5V, 2A Energy Star Compliant Isolated Converter

Jesus Rosales - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Feb 10th 2015
The focus of this circuirt was to take a design based on the LT®3798 and make it Energy Star Compliant; reduce no load, standby power to less than 300mW. That was achieved by adding the components highlighted in the dotted line box in the schematic inside the primary side. This circuit is simply a switch that removes ...

Blog Post Circuit LTspice 

 

LT8310/LT1431 81W Isolated Forward Converter with Opto Feedback; VIN = 12V/24V, VOUT = 54V@1.5A

George Qian - Senior Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Jan 30th 2015
The LT8310 is a constant-frequency resonant reset forward converter controller with a low side N-channel MOSFET gate driver. The LT8310 has a wide input voltage range from 6V to 100V. Its switching frequency can be programed from 100kHz to 500kHz to optimize efficiency, performance or external component size. The LT8310's protection ...

Blog Post Circuit LTspice 

 

Loop Gain and its Effect on Analog Control Systems

Simon Bramble - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Jan 26th 2015
Abstract This article brings together the ideas of open loop gain, closed loop gain, gain and phase margin, minimum gain stability and shows how these parameters are interrelated in a feedback system. It examines loop gain in terms of a theoretical control system as well as practical electronic circuits, including linear regulators. Introduction Bob ...

Blog Post LTspice 

 

LT3790 240W High Efficiency Parallel Buck-Boost Regulator

Keith Szolusha - Applications Engineering Section Leader Jan 5th 2015
The LT3790 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant voltage and constant current at up to 98.5% efficiency using only a single inductor. It can deliver hundreds of watts and features a 60V input and output rating, making it an ideal DC/DC voltage regulator and battery charger ...

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Frequently Asked Questions: LTC4010 & LTC40111 NiCd / NiMH Battery Charger

Oct 7th 2014
The LTC4010 is a complete NiMH/NiCd battery charger solution that requires no microcontroller or firmware programming. The LTC4010 includes charge initiation, monitoring, protection, charge termination and constant current control circuitry for a fast, autonomous charger solution. The IC can fast charge 1- to 16-cell NiMH ...

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Frequently Asked Questions: Thermoelectric Energy Harvesting With the LTC3108 & LTC3109

Dave Salerno - Design Section Leader Oct 6th 2014
Q. What are the target applications for the LTC3108 and LTC3109? A. As discussed in the datasheet, these parts target applications that require a low average power (in the milliwatt range or less). This could be a micro-controller that is running continuously, or a wireless sensor/transmitter that is operating at a low duty ...

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Supercap Backup Circuit Provides Reliable Uninterrupted Power

Sam Nork - Boston Design Center Manager Sep 29th 2014
Temporary backup power is a common requirement for a wide range of applications whenever the main power source is suddenly unavailable. Examples include data backup applications ranging from servers to solid-state drives, power fail alarms in industrial or medical applications, and a host of other “dying gasp” functions ...

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Output Voltage Noise Measurements for Linear Regulators

Kevin B. Scott - Senior Strategic Marketing Engineer
Tony Bonte - Design Manager
Sep 20th 2014
Linear regulators provide a simple, non-switching DC/DC converter solution with low component count, small solution footprint and low output voltage noise. These attributes make them well-suited for applications that have power supply noise constraints, have limited board space and are averse to magnetics. Applications ...

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High Efficiency 100mA Synchronous Buck Converter with Wide Input Range from 4V to 150V

Charlie Zhao - Applications Eng Sep 17th 2014
Introduction The wide 4V to 150V input range of the LTC®3639 stepdown DC/DC converter allows automotive, avionics and distributed power systems to: Cover extensive transient requirements Enable multiple wide-ranging input power sources, such as a high voltage DC bus with a low voltage battery backup Create a ...

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LTC3788 Generates High Voltages Using a Two-Stage Boost Converter

Victor Khasiev - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Sep 17th 2014
Generating high voltages from low level sources is not an easy task. Engineers are facing the following problems when they try to implement single stage boost at high step-up ratios. Limitation of maximum duty cycle in boost controllers Sharp decrease in efficiency at long duty cycles High peak currents and EMI challenges ...

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LTC3786: High Efficiency Li-Ion Battery-to-USB Boost Converter

Goran Perica - Power Applications Section Leader
Gabino Alonso - Strategic Marketing Engineer
Sep 16th 2014
The LTC®3786 is a high performance synchronous boost converter controller that drives all N-channel power MOSFETs. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, enabling the LTC3786 to be used in high power boost applications. A 4.5V to 38V input supply range encompasses ...

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55V High Efficiency Buck-Boost Power Manager and Multi-Chemistry Battery Charger

Charlie Zhao - Applications Eng Aug 27th 2014
Design Note DN531: Introduction Today, battery chargers are expected to easily support a variety of battery chemistries and accept a range of voltage inputs, including wide-ranging solar panels. It is increasingly common for input voltage ranges to span above and below the output battery voltage, requiring both step-down and ...

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Doubling the LTC4120 Wireless Power Receiver for Higher Battery Charge Current

Andy Bishop - Design Engineer
Gabino Alonso - Strategic Marketing Engineer
Aug 27th 2014
The LTC4120 is a constant-current/constant-voltage wireless receiver and battery charger. The charge current is programmed up to 400mA with an external resistor. If more than 400mA is required, then use two LTC4120 devices operating in parallel as shown in this schematic. In this case the two LTC4120 operate from one transmitter ...

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LTC3788 - High Efficiency Dual Boost Regulator with Independent Inputs

Victor Khasiev - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Aug 27th 2014
Linear Technology offers a line of high performance multiple dual output synchronous boost converters. However, most of the datasheet contains examples of these controllers using the same input voltage source for both outputs. In some circumstances there may be a need to derive two different high output voltages from two separate ...

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