±5V to ±15V Tracking Supply -  The LT3032 is a dual, low noise, positive and negative low dropout voltage linear regulator.  Each regulator delivers up to 150mA with a typical 300mV dropout voltage.  Each regulator’s quiescent current is low (30μA operating and__ Linear Technology/Analog Devices App Note, Jan 30th 2012

0-14 volt, 0-2 Amp current limited variable power supply regulator -  When powering up a piece of Homebrew gear for the first time, it's nice to be able to slowly turn up the "juice" and have a current limiting feature, just in case there is a short circuit or other problem some place.  Here's a circuit for a fairly simple variable output / current limited regulator, which you can use with a fixed output bench supply, a gel-cell or use as part of a Homebrew bench supply.    __ Designed by Steven Weber, KD1JV

12V Output Converter Accepts 4V to 80V Input (5.5V Minimum to Start) -  The LT8705 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 LT8705__ Linear Technology/Analog Devices App Note, Feb 15th 2013

12v-24v AC & DC Day/Night Switch -  The circuit uses a bridge rectifier circuit to convert AC into DC.  A 12v zener diode limits the operating voltage of the circuit to 12v.  A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity.  if there is sufficient light, the inverter disables a push-pull oscillator circuit . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2012

150V, 100mA Step-Down Regulator Requires Only Three External Components -  The LTC3639 step-down regulator integrates key high performance features into one compact IC .  it is capable of up to 150V input voltage and 100mA output current, utilizing synchronous rectification and low quiescent current to maintain high efficiency over a broad spectrum of load current.  its adjustable output can be programmed__ Linear Technology/Analog Devices App Note, Jason Leonard Design Engineering Manager-Power Products Jun 18th 2013

1A Variable Regulated Power Supply -  A 'must-have' for the experimenter. __ Designed by Peter Parker VK3YE

2 AA cells power step-down regulator -  01/07/99 EDN Design Ideas:  (Scroll to find this one) DC/DC conversion is particularly challenging when both the input and output voltages are low.  Step-up ICs  that operate with inputs lower than 1V are available, but step-down ICs  that accept input voltages   Page includes several designs.   Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

2 Phases to Cut Current & Improve EMI -  11/12/09 EDN Design Ideas:  in DC/DC-converter applications in which the input voltage may be lower or higher than the output voltage, you can use either a flyback converter or a SEPIC  (single-ended-primary-inductor converter).  SEPIC offer lower input-curre Design by Goran Perica, Linear Technology App Note, Milpitas, CA

200W AdvancedTCA Hot Swap Controller -  The LTC4252 negative voltage Hot Swap controller allows a board to be safely inserted and removed from a live backplane.  Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault __ Linear Technology/Analog Devices App Note, Mar 26th 2010

240VAC to 5VDC Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines. . . Circuit by David Johnson P.E.-February, 2002

24Vin to 1.2Vout AT 15A using Inductor DCR Sensing to Minimize Solution Size & Cost -  This circuit shows a typical application of the LTC3613, configured for DCR sensing in a high step-down solution, 24V to 1.2V, and synchronized to a 350kHz external clock.  __ Linear Technology/Analog Devices App Note, Jun 29th 2012

24Vin to 5VoutAT0.7A Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3573 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary-side flyback waveform.  A 1.25A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

2-Phase Dual Switching Regulator Fits in Tight Places -  DN210 Design Notes__ Linear Technology/Analog Devices

2-Phase, Spread Spectrum, DDR Memory Supplies with Ceramic Output Capacitors -  The LTC3776 is a 2-phase dual output synchronous stepdown switching regulator controller for DDR/QDR memory termination applications.  The second controller regulates its output voltage to 1/2 VREF while providing symmetrical source and sink output current capability.  __ Linear Technology/Analog Devices App Note,, Jun 29, 2011

2-Wire Virtual Remote Sensing for Voltage Regulators -  Linear Technology AN126 __ Designed by Jim Williams - Oct 1st, 2010

–3.3V Negative Converter with 1A Output Current Limit -  The LT8611 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current.  Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.  The built-in current sense amplifier with monitor and__ Linear Technology/Analog Devices App Note, Sep 13th 2012

36VIN, 5.6A Two 2.5V Series Supercapacitor Charger -  The LTM8026 is a 36ViN, 5A constant-voltage, constant current (CVCC) step-down μModule regulator.  included in the package are the switching controller, power switches, inductor and support components.  Operating over an input voltage range of 6V to 36V, the LTM8026 supports an output voltage range of 1.2V to 24V.  CVCC operation allows the LTM8026 to accurately regulate its output current up to 5A over the entire output range.  The output current can be set by a control voltage, a single resistor or a thermistor.  Only resistors to set the output voltage and frequency and the bulk input and output filter capacitors are needed to finish the design__ Linear Technology/Analog Devices App Note, Feb 17th 2012

3A 2MHz Monolithic Synchronous Step-Down Regulator Provides a Compact Solution for DDR Memory Termination -  DN309 Design Notes__ Linear Technology/Analog Devices

3-Phase Rectifier & Voltage Reducer form a Offline Single-Phase Supplies -  EDN-Design ideas -- 04/06/12    Missing diodes create gaps to allow voltage reduction. Design by JB Castro-Miguens, Cesinel, Madrid, Spain; C Castro-Miguens, University of Vigo, Spain; M Pérez Suárez, University of Vigo, Spain; and A Abal Pena, Tekplus, Vigo, Spain

4.3V to 42Vin 3.3V AT 5A Step-Down Converter -  The LT3976 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V.  Low quiescent current design consumes only 3.3 μA of supply current while regulating with no load.  Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output__ Linear Technology/Analog Devices App Note, Sep 12th 2012

4.5-28Vin to 2.5VoutAT6A Ultra Low Noise uModule Power Supply -  The LTM4606 is a complete EN55022 Class B certified noise high voltage 6A switching mode DC/DC power supply.  included in the package are the switching controller, power FETs, inductor, and all support components.  The on-board input filter and noise cancellation circuits achieve low noise operation, thus effectively reducing the electromagnetic interference (EMi).  Operating over an input voltage range of 4.5V to 28V, the LTM4606 supports an output voltage range of 0.6V to 5V, set by a single resistor__ Linear Technology/Analog Devices App Note, Apr 22, 2011

42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current -  11/26/13  EDN-Design Notes   Measure inductance & capacitance over a wide range.  The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications.  To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation.  The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output.   Design by Hua  Walker Bai

4MHz Monolithic Synchronous Step-Down Regulators Bring High Efficiency to Space-Sensitive Applications -  DN304 Design Notes__ Linear Technology/Analog Devices

5V High Current Step-Down Switchers -  The LT1241 current mode PWM control IC can be used to make a simple high frequency step-down converter.  This converter also has low manufacturing costs due to simple magnetic components.  This circuit exhibits a wide input range of 30V to 60V while maintaining its 12A 5V output.  it has short circuit protection and uses minimal PC board area due to its 300KHz switching frequency[DN59Design Notes (Linear Technology]__ Linear Technology/Analog Devices

5V to 3.3V Converters for Microprocessor Systems -  AN58 Many popular microprocessors operate from 3.3 V supplies, yet y are used in systems wherepredominate source of power is 5V.  AN58 presents a collection of both linear and switching regulator solutions for conversion of 5V to 3.3 V at currents ranging from 100mA to 20A.  Applications information and a comparison of various bypass capacitor__ Linear Technology/Analog Devices

60V High Efficiency Buck Switching Regulators in SO-8 -  DN202 Design Notes__ Linear Technology/Analog Devices

725V DC Isolated Low Noise μModule Regulator -  The LTM8047 is an isolated flyback μModule DC/DC converter.  The LTM8047 has an isolation rating of 725VDC.  included in the package are the switching controller, power switches, transformer, and all support components.  Operating over an input voltage range of 3.1V to 32V, the LTM8047 supports an output voltage range of 2.5V__ Linear Technology/Analog Devices App Note, Mar 30th 2012

78xx Regulator Board -  circuit board and circuit for making voltage regulators based on 78xx IC s, in PDF format, text in Finnish__ 

80V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC with 4 Regulation Loops -  in today’s modern electronic systems, the need for power conversion circuits that can do more than 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__ Linear Technology/Analog Devices App Note, Albert Wu Design Engineering Manager-Power Products Feb 11th 2013

9v 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 Johnson P.E.-December, 2009

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