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Power Supplies:  DC to DC / Switch Mode and DC to DC Converters
Boost,    Buck,    Buck-Boost,    Switchmode

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Last Updated: December 31, 2017 06:44 AM

Circuits Designed by Dave Johnson, P.E. :

 Laptop Power Supply - Concept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  I’d like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

 LC Oscillator Medium Power 125Khz - This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Low Parts Count DC/DC Converter with 3.3V & 5V Outputs -  DN69 Design Notes__ Linear Technology/Analog Devices

Low Power DC to DC Converter -  The circuit below is a DC to DC converter using a standard 12 VAC center tapped power transformer wired as a blocking oscillator.  The circuit is not very efficient but will produce a high voltage usable for low power applications.  The input battery voltage is raised by a factor of 10 across the transformer and further raised by a voltage tripler consisting of three capacitors and diodes connected to the high voltage side of the transformer __ Designed by Bill Bowden

Low Power FM Transmitter -  Useful to retransmit the hi-fi to another FM receiver nearby, or as a wireless mic __ Designed by Rod Elliott  ESP

Low Power FM Transmitter -  This low power fm transmitter is designed to use an input from another sound source and transmits on the commercial FM band.  This low power fm radio transmitter it is actually quite powerful.  The first stage is the oscillator, and is tuned with the variable capacitor.  Select an unused frequency, and carefully adjust C3 until the background noise is removed.__ 

Low-cost biases VCOs for cable & TV -  11/20/97 EDN Design Ideas:  PLLs are useful in a variety of applications, most notably cable and TV tuners.    __ Circuit Design by Ravindra Ambatipudi, National Semiconductor Corp, Santa Clara, CA

Low-cost feedback boosts efficiency -  01/21/99 EDN Design Ideas:  NOTE:     Page includes several designs.  Scroll to find this one.   To implement a step-up converter with a current output, designers often simply connect the load in place of the top resistor in a resistive-divider feedback network.  The bottom resistor then serves as a current-sense resistor.  Though simple, this approach is inefficient.  Low efficiency __ Circuit Design by John Guy, Maxim Integrated Products, Sunnyvale, CA

Low-cost switcher converts 5 to 24V -  02/16/98 EDN Design Ideas:  (File contains several circuits, scroll to find this one)  __ Circuit Design by Paul C Florian, Plano, TX

Low-cost, Simple Circuit 1-kV driver -  13-May-04 EDN Design Ideas:  High-voltage drivers have recently received much attention, because they play an important role in driving piezoelectric and electro-optical components, for example.  Figure 1 shows a simple, low-cost, 1-kV driver.  The circuit uses offline, current-mode-control techniques and a flyback switching-power-supply design __ Circuit Design by Tai-Shan Liao and Prasit Champa, National Science Council, Hsinchu, Taiwan

Low-dropout linear regulators Deliver constant currents -  05/11/06 EDN Design Ideas:  High-side current source uses a positive-output linear voltage regulator to deliver 25 mA __ Circuit Design by Budge Ing, Maxim Integrated Products Inc, Sunnyvale, CA

Low-dropout linear regulators double as voltage-supervisors -  03/16/06  EDN Design Ideas:  You can use this circuit as a voltage supervisor or as a controlled-characteristic linear-voltage regulator __ Circuit Design by William Lepkowski, On Semiconductor, Tucson, AZ

Low-dropout regulator, SMPS cascade suppress ripple, maintain efficiency -  3-Aug-06 EDN Design Ideas:  Two regulators work better than one in noise-sensitive applications __ Circuit Design by Scot Lester, Texas Instruments, Dallas, TX

Lower DC/DC converter ripple by using optimum capacitor hookup -  31-Oct-02 EDN Design Ideas:  Low-ripple-voltage positive-to-negative DC/DC converters find use in many of today's high- frequency and noise-sensitive disk drives, battery-powered devices, portable computers, and automotive applications.  Like a positive buck converter, a positive-to-negative converter can have low output-ripple voltage if you place the bulk input capacitor between ViN and VOUT rather than between ViN and gr __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Lower Operating Frequency Improves Icl7660 Voltage Conversion Efficiency -  App Note #10__ Maxim Integrated

Low-noise step-up supply generates -5.5V output -  10/09/97 EDN Design Ideas:  Some two- to three-cell applications require negative potentials higher than the battery voltage.  The typical GaAsFET transmitter in a cellular phone, for example, requires a negative bias.    __ Circuit Design by Larry Suppan, Maxim Integrated Products, Sunnyvale, CA

Low-Power Converter has Galvanic Isolation -  07/02/98 EDN Design Ideas:  NOTE:     FILE
has several circuits, please scroll to find this one.  Certain low-power applications require a simple, low-cost, galvanically isolated power supply.  Figure 1 shows a circuit that meets these requirements.  The dc/dc converter provide as a 12V, 150-mW output using only a few components and a small transformer.  The input can come from any power source that supplies 14 to 18V.  The CD4049 forms an oscillator that operates at approximately 200 kHz (Figure 2).  The asymmetry of the oscillator's waveform depends on the value of R.  The voltage VS in Figure 1 is proportional to the waveform's asymmetry. __ Circuit Design by Jose Carrasco, Universidad de Valencia, Spain

Low-Power Voltage Doubler -  All miniature electronic devices operate off batteries.  Some of them need higher than the standard battery voltages to operate efficiently.  if the battery of that specific voltage is unavailable, we are...__ Electronics Projects for You

LT1070 Design Manual -  AN19 Linear Technology This design manual is an extensive discussion of all standard switching configurations for the LT107) 0; including buck, boost, flyback, forward, inverting and "Cuk.  " The manual includes comprehensive information on the LT107) 0, the external components used with it, and complete formulas for calculating component values.  __ Linear Technology/Analog Devices

LT1074/LT1076 Design Manual -  AN44 Linear Technology This note discusses the use of the LT107) 4 and LT107) 6 high efficiency switching regulators.  These regulators are specifically designed for ease of use.  This App Note is intended to eliminate the most common errors that customers make when using switching regulators__ Linear Technology/Analog Devices

LT1120A-Micropower Regulator with Comparator & Shutdown -  Switching Regulator__ Linear Technology/Analog Devices

LT1304: Micropower DC/DC Converter with Independent Low-Battery Detector -  DN120 Design Notes__ Linear Technology/Analog Devices

LT1307 Single-Cell Micropower Fixed-Frequency DC/DC Converter Needs No Electrolytic Capacitors -  DN128 Design Notes __ Linear Technology/Analog Devices

LT1339 Design Manual -  AN73 Linear Technology This App Note contains detailed design information to allow the reader to craft switching regulators using the LT1339 high power synchronous DC/DC converter.  The note provides expanded pin descriptions for the LT1339 as well as easy-to-use graphical tools__ Linear Technology/Analog Devices

LT1370: a 500kHz 6a Monolithic Boost Converter -  DN183 Design Notes__ Linear Technology/Analog Devices

LT1500/LT1501 Low Noise Micropower DC/DC Converters -  DN151 Design Notes__ Linear Technology/Analog Devices

LT1619: Tiny Boost Controller Provides Efficient Solutions for Low Voltage Inputs -  DN255 Design Notes__ Linear Technology/Analog Devices

LT1777 High Voltage Low Noise Buck Switching Regulator -  DN212 Design Notes__ Linear Technology/Analog Devices

LT3757 Boost, Flyback, SEPIC & Inverting Controller-Video Product Brief -  The LT3757 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.  it can be configured as either a boost, flyback, SEPiC or inverting controller.  The LT3757 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The__ Linear Technology/Analog Devices App Note, Kevin B. Scott-Strategic Marketing Engineer Jun 4th 2010

LT3791 Buck-Boost Controller Drives High-Power LEDs, Charges High-Voltage Batteries -  08/29/13  EDN-Design Notes The LT®3791 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant-current and constant-voltage at up to 98.5% efficiency with a single inductor.  it can deliver hundreds of watts and features a 60V input and output rating, making it ideal for driving high power LED strings and charging high voltage batteries when both step-up and step-down conversion is needed.  it can also be used as a constant voltage buck-boost regulator with current limiting and monitoring for both input and output.   __ Circuit Design by Keith Szolusha

LT3798 Isolated No Opto-Coupler Flyback Controller with Active PFC-Video Product Brief -  The LT®3798 is a constant-voltage/constant-current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter.  A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, __ Linear Technology/Analog Devices App Note, Bruce Haug-Product Marketing Engineer Mar 6th 2012

LT8705 80V VIN / VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller-Video Product Brief -  The LT®8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage.  The part has integrated input current, input voltage, output current and output voltage feedback loops.  With a wide 2.8V to 80V input and 1.3V to 80V output range, the__ Linear Technology/Analog Devices App Note, Bruce Haug-Senior Product Marketing Engineer Jun 11th 2013

LTC Design Note 509: Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V -  EDN Design Ideas:  03/30/2014     A tiny, integrated flyback converter requires minimal support components __ Circuit Design

LTC Design Note 512: 65V 500mA step-down converter fits automotive & industrial applications -  05/31/14  EDN Design Ideas:  This switcher is happy to drop a 60V input all the way down to 0.8V.  The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout.  The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages.  As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages __ Circuit Design by Charlie Zhao

LTC Design Note: 10A μModule step-down regulator with advanced input & load protection -  EDN Design Ideas:  07/01/2015    This switcher design has comprehensive electrical and thermal protection, and high efficiency over wide input-output ranges __ Circuit Design

LTC Design Note: 55V High efficiency buck-boost power manager & multi-chemistry battery charger -  EDN Design Ideas:  01/01/2016    A versatile, efficient, multi-chemistry battery charger design operates in buck & boost modes. __ Circuit Design

LTC Design Note: 6A Monolithic synchronous DC/DC step-down converter with digital power system management -  EDN Design Ideas:  01/02/2017    Efficient 6A buck sports PMBus configuration and monitoring __ Circuit Design

LTC Design Note: 80V synchronous 4-switch buck-boost controller Delivers hundreds of watts with 99% efficiency -  EDN Design Ideas:  12/26/2014     An 80V synchronous 4-switch buck-boost controller that can provide hundreds of watts at up to 99% efficiency with a single inductor.  Four servo loops __ Circuit Design

LTC Design Note: Dual-phase buck controller drives high Density 1.2V/60A supply with sub-milliohm DCR sensing -  EDN Design Ideas:  07/31/2015    Low output voltages and use of DrMOS integrated FETs+drivers are hallmarks of this switcher design __ Circuit Design

LTC1265: a New High Efficiency Monolithic Buck Converter -  DN105 Design Notes__ Linear Technology/Analog Devices

LTC1446/LTC1446L: World’s First Dual 12-Bit DACs in SO-8 -  DN131 Design Notes__ Linear Technology/Analog Devices

LTC1590: Applications Versatility of Dual 12-Bit DAC -  DN167 Design Notes__ Linear Technology/Analog Devices

LTC1626: Step-Down Converter Operates from Single Li-ION Cell -  DN196 Design Notes__ Linear Technology/Analog Devices

LTC1871 No Rsense Controller is Small & Efficient in Boost Flyback & Sepic Applications -  DN296 Design Notes__ Linear Technology/Analog Devices

LTC2400 Differential to Single-Ended Converter for Single 5V Supply This Converter has High Accuracy Very Low Offset & Offset Drift, -  Design Solutions 6 Design Notes__ Linear Technology/Analog Devices

LTC2400 High Accuracy Differential to Single-Ended Converter for ±5V Supplies -  DN207) Design Notes__ Linear Technology/Analog Devices

LTC2400 High Accuracy Differential to Single-Ended Differential to Single-Ended Converter has Very High Uncalibrated Accuracy & Low Offset & Drift -  Design Solutions 1 Design Notes__ Linear Technology/Analog Devices

LTC3765/LTC3766 Isolated Forward Converter Chipset with Active Clamp Reset-Video Product Brief -  The LTC®3765 is a start-up controller and gate driver for use in a self-starting secondary-side control forward converter.  When combined with the LTC3766 secondaryside synchronous forward controller, a complete isolated power supply is created using a minimum of discrete parts.  A proprietary scheme is used to multiplex gate__ Linear Technology/Analog Devices App Note, Bruce Haug-Product Marketing Engineer Mar 6th 2012

LTM4600 DC/DC µModule Thermal Performance Application Note -  AN103 Linear Technology This App Note provides an extensive guideline for the thermal performance of the LTM4600 µmodule.  The LTM4600 is characterized with and without heatsinking over an extended operating temperature range.  De-rating curves are derived with the different heatsinking types, __ Linear Technology/Analog Devices

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