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Voltage Regulator Circuits

Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S      
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Last Updated: 11/30/2017 07:17 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

Light to Frequency Converter -  This circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter.  A small Pin photo diode is used as the light detector.  The pulses produced are short, so in some applications you may want to stretch them or . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2008

LM317 adjustable voltage regulator used in Battery Eliminator Circuit -  if you use a 1.5v or a 3v battery powered MP3 player for long periods of time, you may get tired of constantly changing batteries.  Some older players do not work will NiMH
rechargeable batteries so changing out batteries can get expensive.  The circuit be . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2005

Miniature Pushbutton On/Off Switch -  in many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch.  One press turns the device on and second press turns it back off.  The flip/flop circuit below uses a minimum number of parts to perform . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Negative 0.5 Volt Supply -  This simple circuit consists of two LEDs and a photo diode.  it generates a negative voltage with a current level of a couple milliamps.  it is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Nine-Volt Battery Eliminator -  if you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David A. Johnson P.E.-December, 2009

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747




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

Logic PSU with OverVoltage Protection -  A simple 5 Volt regulated PSU featuring overvoltage protection. __ Designed by Andy Collison

Low 25uVrms Noise Linear Regulator Paralleled for Higher Output Current -  The LT1762 series are micropower, low noise, low dropout regulators.  The devices are capable of supplying 150mA of output current with a dropout voltage of 270mV.  Designed for use in battery-powered systems, the low 25μA quiescent current makes them an ideal choice.  Quiescent current is well controlled; it does not rise in__ Linear Technology/Analog Devices App Note, Apr 22, 2011

Low Current, High Voltage Power Supply -  A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc.  Such a power supply...__ Electronics Projects for You

Low Dropout 550kHz DC/DC Controller Operates from Inputs as Low as 2V -  DN208 Design Notes__ Linear Technology/Analog Devices

Low Noise Low Ripple Triple Output Supply Providing 1V, 8A & 1.8V, 5A & 1.5V, 3A -  The LT3070 is a low voltage, UltraFast transient response linear regulator.  The device supplies up to 5A of output current with a typical dropout voltage of 85mV.  A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS.  The LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving__ Linear Technology/Analog Devices App Note, Apr 22, 2011

Low Noise Varactor Biasing with Switching Regulator -  AN85 Telecommunication, satellite links and set-top boxes all require tuning a high frequency oscillation.  The actual tuning element, a varactor diode, requires high voltage bias for operation.  The high voltage bias must be free of noise to prevent unwanted oscillator outputs__ Linear Technology/Analog Devices

Low Noise Varactor Biasing with Switching Regulators: Vanquishing Villainous Vitiators Vis-ŕ-Vis Vital Varactors -  Linear Technology AN85 __ Designed by Jim Williams - Aug 1st, 2000

Low Voltage , High Current Time Delay -  in this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage.  Approximately 5 amps of current can be obtained using a couple fresh alkaline D batteries.  Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TiP35 or similar).  The 4th comparator is used to generate a time delay after the normally closed switch is opened __ Designed by Bill Bowden

Low Voltage High Current Time Delay -  in this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage.  Approximately 5 amps of current can be obtained using a couple fresh alkaline D batteries.  Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TiP35 or similar).  The 4th comparator is used to generate a time delay after the normally closed switch is opened __ Designed by Bill Bowden

Low Voltage Hot Swap Controller Ignores Backplane Noise & Surges -  DN319 Design Notes__ Linear Technology/Analog Devices

Low-Battery Detector Preregulates Input Voltage -  08/15/96 EDN Design Ideas:  The circuit in Figure 1 uses the comparator and voltage reference of a low-battery detector to preregulate the input voltage.  The circuit provide as an additional regulated voltage output at VOUT1 and significantly reduces the linear regulator's (VOUT2's) power dissipation.  The two outputs (12V at 50 mA and 5V at 100 mA) are independent. __ Circuit Design by Khy Vijeh, Analog Devices Inc, Santa Clara, 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-dropout 12V regulator LM324 -  Most regulator circuits require at least 3 to 5 volts between input and output to operate reliably.  This regulator features a P-Channel MOS-FET pass element that will allow for a very low drop out voltage.  in my particular application reliable operation was noted down to nearly 0.1volt between input and output at nearly 0.8 amperes of load current.  Useful applications include automotive and battery applications were regulation is desired and available input-output differential __ Designed by Robert A. Jones

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

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

Low-Voltage Adjustable Regulator -  Need to operate a CD, DVD or MP3 player from the cigarette lighter socket in your car? Or perhaps run a digital still or video camera or some powered speakers from the power supply inside your PC? This Low-Voltage Adjustable Regulator will step the voltage down to what's needed.  it has jumper shunts to select one of six common output voltages (from 3-15V) and depending on the input voltage and the heatsink (s) you use, it can deliver an output current of just over 4A.__ SiliconChip

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 __ Linear Technology/Analog Devices App Note, Brendan Whelan Design Manager-Signal Conditioning Products Feb 12th 2013

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

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

LT1534 UltraLow Noise Switching Regulator Controls EMI -  DN178 Design Notes __ Linear Technology/Analog Devices

LT1580 Fast Response Low Dropout Regulator Achieves 0.4 Dropout at 4 Amps -  DN119 Design Notes __ Linear Technology/Analog Devices

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

LT3009 3μA IQ, 20mA Low Dropout Linear Regulators-Video Product Brief -  The LT3009 Series are micropower, low dropout voltage (LDO) linear regulators.  The devices supply 20mA output current with a dropout voltage of 280mV.  No-load quiescent current is 3μA.  Ground pin current remains at less than 5% of output current as load increases.  in shutdown, quiescent current is less than 1μA.  __ Linear Technology/Analog Devices App Note, Tony Armstrong-Director of Product Marketing Dec 7th 2009

LT3015 1.5A, Low Noise, Negative LDO with Precision Current Limit-Video Product Brief -  The LT®3015 series are low noise, low dropout, negative linear regulators with fast transient response.  The devices supply up to 1.5A of output current at a typical dropout voltage of 310mV.  Operating quiescent current is typically 1.1mA and drops to < 1μA in shutdown.  Quiescent current is also well controlled in dropout.  __ Linear Technology/Analog Devices App Note, Steve Knoth-Senior Product Marketing Engineer Mar 25th 2013

LT3070 5A, Low Noise, Digitally Programmable Output, 85mV LDO Regulator-Video Product Brief -  The LT3070 is a low voltage, UltraFast™ transient response linear regulator.  The device supplies up to 5A of output current with a typical dropout voltage of 85mV.  A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS.  The LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving__ Linear Technology/Analog Devices App Note, Steve Knoth-Senior Product Marketing Engineer Jun 29th 2010

LT3080 Adjustable 1.1A Single Resistor Low Dropout Regulator-Video Product Brief -  The LT3080 is a 1.1A low dropout linear regulator that can be paralleled to increase output current or spread heat in surface mounted boards.  Architected as a precision current source and voltage follower allows this new regulator to be used in many applications requiring high current, adjustability to zero, and no heat sink.  __ Linear Technology/Analog Devices App Note, Steve Knoth-Senior Product Marketing Engineer Nov 18th 2009

LT3081 1.5A Single Resistor Rugged Linear Regulator with Monitors-Video Product Brief -  The LT3081 is a 1.5A low dropout linear regulator designed for rugged industrial applications with monitoring and protection features.  Key features of the device are the extended safe operating area, wide input and output voltage ranges, output current monitor, temperature monitor and programmable current limit.  The LT3081__ Linear Technology/Analog Devices App Note, Steve Knoth-Senior Product Marketing Engineer Jul 30th 2013

LT3465-1.2MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  LT3465 Switching Regulator__ Linear Technology/Analog Devices

LT3465A-2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  Switching Regulator__ 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

LT6110-Cable/Wire Drop Compensator with LT1965 Linear Regulator -  Click Here For A Ready To Run LTspice Circuit Demonstration 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 __ Linear Technology/Analog Devices App Note, Greg Zimmer Oct 17th 2013

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

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Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S       T - Z


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