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Application Notes

Over 2200 application notes and technical articles written by engineers, for engineers.
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Power-supply circuits

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ALSO SEE: Power-Supply Cookbook — Tested designs, with bill of materials, to meet your specs.

Boost/step-up

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App Note 4499 Abstract
Miniature circuit converts negative inputs to positive outputs

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PDF (575K)

App Note 4669 Abstract
112W boost driver for long strings of LEDs using all ceramic capacitors

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App Note 4687 Abstract
LEDs allow new remote-controlled lighting applications

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App Note 4612 Abstract
Boost driver for long LED strings using aluminum electrolytic capacitors

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PDF (215K)

App Note 4646 Abstract
Use thermal analysis to predict an IC's transient behavior and avoid overheating

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App Note 4621 Abstract
Simple Circuit Prevents USB Current Overshoot During Insertion

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App Note 4445 Abstract
Boost Converter Switches Between Battery and USB Power

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App Note 4434 Abstract
USB-Powered Bipolar Supply

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App Note 4456 Abstract
Understand Thermal Derating Aspects of PWM ICs to Ensure the Best System Performance

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App Note 752 Abstract
Creating a fast load transient

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App Note 4151 Abstract
Using the MAX15005 Supply and Driver for an LED Application

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App Note 4087 Abstract
An Introduction to Switch-Mode Power Supplies

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PDF (157K)

App Note 3983 Abstract
Designing Single-Switch, Resonant-Reset, Forward Converters

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App Note 3988 Abstract
Inductor Choice Yields Performance Tradeoffs in DC-DC Converters

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App Note 3943 Abstract
±15V or ±12V Output Switch-Mode Power Supply Has Wide Input-Voltage Range

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App Note 3929 Abstract
Avalanche-Photodiode Detector Circuit Limits Current to 1mA and Improves Transient Response

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App Note 3755 Abstract
High-Power White-LED Driver Operates on 1 or 2 Alkaline Cells

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App Note 3757 Abstract
Bias Supply Powers Low-Power Geiger-Mueller Tube

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PDF (101K)

App Note 3744 Abstract
Circuit Enables Single NiMH Cell to Simulate a Lithium Battery

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PDF (91K)

App Note 3639 Abstract
Design of a Nonisolated, Flyback LED Driver Circuit

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PDF (149K)

App Note 3638 Abstract
2.2MHz Buck or Boost Power Supply for ADSL2+ Chipset

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App Note 3535 Abstract
Pushbuttons Control Regulated Switching Converter

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App Note 3468 Abstract
High-Efficiency Step-Up Converter Robs Parallel Port

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App Note 3243 Abstract
White-LED Boost Converter vs. Charge Pump

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PDF (37K)

App Note 3325 Abstract
Simple Circuit Generates +3.3V at 1A From -5V

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App Note 2997 Abstract
Basic Switching-Regulator-Layout Techniques

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App Note 2047 Abstract
Step-Up/Step-Down Converter Features Ultra-Low Quiescent Current

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App Note 1804 Abstract
Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently

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App Note 1897 Abstract
Building a DC-DC power supply that works

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App Note 1864 Abstract
Regulated Dual Voltages Control STN-LCD Contrast

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App Note 1831 Abstract
Low-Noise APD Bias Circuit

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App Note 1805 Abstract
Choosing the MAX1932 External Inductor, Diode, Current-Sense Resistor, and Output Filter Capacitors for Worst-Case Conditions

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PDF (305K)

App Note 226 Abstract
Step-Up DC-DC Converter Calibration and Adjustment Using a Digital Potentiometer

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App Note 1803 Abstract
Simple Circuit Provides +5V Gate Bias From -48V Input

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App Note 1791 Abstract
Inductorless Voltage Converter Boosts a Single Lithium Cell

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PDF (51K)

App Note 1783 Abstract
Two AA Cells Power Dual-Supply µP

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App Note 1750 Abstract
Powering Six White LEDs with High Efficiency Using the MAX1848

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App Note 1751 Abstract
High-V DC-DC Converter Is Ideal for MEMS (Warning: High-Voltage Circuit)

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App Note 1736 Abstract
Powering Four White LEDs with High Efficiency Using the MAX1848

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PDF (59K)

App Note 1213 Abstract
Tracking Power Supply Has Dual Outputs

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PDF (39K)

App Note 1170 Abstract
Circuit Connection Adds Current-Mode Operation to PFM Boost Converters

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App Note 716 Abstract
Proper Layout and Component Selection Controls EMI

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App Note 1158 Abstract
Power Supply From 4-20mA Transmission Line

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App Note 1147 Abstract
Simple Current Source Determines the MAX1802 Auxiliary Controller Switching Frequency

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App Note 280 Abstract
Power Supplies for Telecom Systems

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PDF (201K)

App Note 1109 Abstract
Small, High-Voltage Boost Converters

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PDF (46K)

App Note 1134 Abstract
Uninterruptible Power Supply for USB Devices

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App Note 1114 Abstract
High-Power Boost Converter Maintains Light-Load Efficiency

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App Note 1077 Abstract
DC-to-DC Converter Combats EMI

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PDF (170K)

App Note 1037 Abstract
Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections

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PDF (49K)

App Note 1054 Abstract
Simple Change Improves PFM Boost-Controller Efficiency

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PDF (106K)

App Note 1014 Abstract
Design Case Study: Designing a Power Supply for a Portable, Wireless Contact Manager

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PDF (37K)

App Note 947 Abstract
Dual Power Supply for Wallcube/Battery-Powered Systems

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PDF (31K)

App Note 940 Abstract
Feedback Circuit Enhances Efficiency of Boost-Converter Current Source

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PDF (27K)

App Note 950 Abstract
Single-Cell Boost Converter Generates Auxiliary Bias For LCD

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PDF (144K)

App Note 817 Abstract
Using Thermistors in Temperature Tracking Power Supplies

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PDF (117K)

App Note 735 Abstract
Layout Considerations for Non-Isolated DC-DC Converters

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PDF (129K)

App Note 2031 Abstract
DC-DC converter tutorial

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PDF (38K)

App Note 737 Abstract
Choosing the Right Power-Supply IC for your Application

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PDF (37K)

App Note 782 Abstract
Charge Pump Doubles Negative Voltage

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App Note 477 Abstract
All-Ceramic 200mA Step-Up Converter for USB

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App Note 473 Abstract
Integrated power supplies are highly reliable and compact postregulators

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App Note 268 Abstract
Wireless-Modem Power for Hand-Held Devices

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App Note 269 Abstract
Trading Performance for Cost in Portable Power Supplies

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PDF (31K)

App Note 296 Abstract
3.3V Supply Taps Power from the -12V PCI Bus

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PDF (27K)

App Note 553 Abstract
5V, Non-Interruptible Power Supply Delivers 1A

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App Note 1910 Abstract
-12V to -5V/400mA Regulator Ensures Sequencing With 5V Rail

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App Note 44 Abstract
Regulated Step-Up Converter Provides High Efficiency Without Inductors

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PDF (200K)

App Note 951 Abstract
Switch Allows Low-Voltage Regulator To Start Under Load

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App Note 113 Abstract
Boost DC-DC Voltage Regulator Converts To Current Source for Battery Charging

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App Note 491 Abstract
Low-Power IC Converts -48V to 5V Without Transformer

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App Note 1198 Abstract
Off-The-Shelf Transformer Limits Capacitor Inrush Current

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App Note 974 Abstract
Discrete Charge Pump Adds -12V Output to +12V Boost Converter

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App Note 1029 Abstract
Supply Generates 5V from Low-Voltage Solar-Cell Power

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App Note 1177 Abstract
Power-Boost Circuit Powers Cellular Handset

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PDF (165K)

App Note 933 Abstract
Negative Buck Regulator Employs Step-Up Controller

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PDF (52K)

App Note 3843 Abstract
±15V Switch-Mode Power Supply Has Wide Input-Voltage Range

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