C Volt Ranger:  transforms a0-5-Volt input voltage to a adjustable range between0-10-Volt (added 4/02)

Capacitor Improves Efficiency in CPU Supply:  04/04/02 EDN Design Ideas  /  (added 3/05)  High efficiency is important for  dc/dc buck converters that supply high currents in notebook PCs. This efficiency extends battery life and minimizes temperature rise. A low-dissipation synchronous rectifier using an external MOSET provides this high efficiency. Synchronous rectifiers require special attention, however. ...

Charge Pump and Step Up DC DC Converter Solutions for Powering White LEDs in Series or Parallel Connections:  Maxim Application Note #1037 (app note added 7/03)

Charge Pump Circuit Divides by Two:  02/18/99 EDN-Design Ideas / (added 5/03) Small size and efficiency approaching 100% make switched-capacitor charge pumps popular for voltage doubling and inverting in miniature dc-dc applications. Few are aware, however, that most charge pumps can halve as well as double or invert an input voltage. The increasing adoption of low-voltage logic makes this ÷2 capability useful for generating low-voltage supplies in portable equipment. You can use it, for example, to convert a 3.6V RF-supply voltage to 1.8V for powering low-voltage logic (Figure 1). Simply reversing  input and output of a voltage doubler makes it a voltage divider. Implementing this scheme with MAX660 or MAX1683 voltage-doubler charge....

Charge Pump Converts  Volt in to± Volt Out:  09/02/99 EDN-Design Ideas / (added 9/05) /A charge-pump IC's ability to produce both VIN and -VIN outputs allows  circuit in Figure 1 to generate separate positive and negative outputs from a single input voltage, regardless of  input-voltage polarity. For example,  circuit allows an RS-232C interface to generate a dual supply for low-power data-acquisition systems (if you use TxD as VIN, and you limit VIN to  ±6V maximum that IC1 can accommodate). Consider a positive VIN: The positive VOUT appears via D1 and supplies power to  IC via Pin 8. D2 and R1 pull Pin 7 high, which is a condition (along with or connections) for setting  chip in its inverter mode. As a result,  circuit produces -VOUT at Pin 5....

Charge Pump Doubles Negative Voltage:  Maxim Application Note #782 (app note added 7/03)

Chinese Translation: Design Guidelines for Off-line Flyback Converters using FPS / AN-4137SC:  Fairchild Application Notes / (app note added 6/06)

Choosing the Right Power Supply IC for Your Application:  Maxim Application Note #737 (app note added 7/03)

Circuit Forms Single Pulse Voltage Multiplier :  09/18/03  EDN-Design Ideas / (schematic / circuit added 11/03) It is sometimes necessary for a microcontroller to generate a pulse whose voltage is higher than the power-supply voltage of the microcontroller. The circuit in Figure 1 allows you to generate 14V pulses from a 5V power supply. An adaptation of the circuit provides a 5 to 12V programming pulse for programming the fuse bits in Atmel…

Circuit Provides +5 Volt Gate Bias From  48 Volt Input:  Maxim Application Note #1803 (app note added 7/03)

Circuit Provides Leading Edge Blanking:  05/29/03 EDN Design Ideas (adden 02/05)  In isolated switch-mode power supplies using peak-current-mode control, generally the current-sense resistor senses the current on the primary side of the power converter. Figure 1 shows a typical circuit, in which R2 is the current-sense resistor that monitors the current. The current-sense signal goes to the input of the PWM comparator—in this case, the PWM comparator's input (ISENS......

Circuit Translates I 2c Voltages:  12/26/02 EDN Design Ideas (adden 02/05)  This Design Idea explores level-shifting an I˛C bus from 5V/ground (positive domain) to ground/25V (negative domain). In multisupply systems, you sometimes face a situation in which digital information stored in logic circuits running from 5V to ground needs conversion to analog signals referenced to a negative supply....

Compact Inductorless Boost Circuit Regulates White LED Bias Current:  Maxim App Note #1116 (app note added 7/03)

Constant on Time Buck/Boost Regulator Converts a Positive Input to a Negative Output:  12/07)/04 EDN Design Ideas  / (added 11/05)  Buck regulators find wide application as step-down regulators for converting large positive input voltages into a smaller positive output voltages. Figure 1 shows a simplified buck regulator that operates in continuous-conduction mode—that is, the inductor current always remains positive. The output voltage, VOUT, is equal to D×VIN, where D is the duty-cycle ratio of the buck switc...

Controlling a Variable Voltage Power Supply using the DS1809 (Pushbutton Control):  Maxim App Note #1035 (app note added 7/03)

Convert Voltage to potentiometer Wiper setting:  09/05/02 EDN Design Ideas  /  (added 1/05)  The circuit in Figure 1converts an analog input voltage, VIN, to a proportional wiper setting of a DPP (digitally programmable potentiometer). The potentiometer's wiper setting, which varies from position 0 through 31, corresponds to the input voltage, which varies from 0 to 1V dc. The CAT5114, IC5, is a 32-tap potentiometer with an increment/decrement interface....

DAC Powered Charge Pump Varies Negative Rail:  Maxim Application Note #203 (app note added 7/03)

Dc to DC Converter Allows of Single Battery:  Have you ever wanted to circuit to run off a single 9 Volt battery only to find you needed levels like +12 and -12 Volts? The thought of multiple batteries might have put you off. Why not use a simple DC to DC converter? (added 4/02)

DC/DC Conversion Without Inductors:  Maxim Application Note #725 (app note added 7/03)

DC/DC Converter Increases Available Power in Dual Voltage System:  01/08/04 EDN Design Ideas  /  (added 1/05)  The schematic in Figure 1 shows a way to increase the power available from a current-limited 5V supply by adding power from a -5V supply. The dc/dc converter generates a single 12V, 150-mA (1.8W) output from two regulated and current-limited input sources at 5V, 300 mA (1.5W) and -5V, 300 mA (1.5W)....

DC/DC Converter Operates from Phone Line :  1/15/98 EDN Design Ideas /  (added 11/05)

Dc-to-DC Converter:  will produce a 85-Volt voltage from +3V, usable for low power applications (added 4/02)

Design Case Study: Designing a Power Supply for a Portable Wireless Contact Manager :  Maxim App Note #1014 (app note added 7/03)

Design Guidelines for Off-line Flyback Converters using FPS / AN-4137:  Fairchild Application Notes / (app note added 6/06)

Design Guidelines for Quasi-Resonant Converters Using FSCQ-series Fairchild Power Switch (FPStm) / AN-4146:  Fairchild Application Notes / (app note added 6/06)

Design Guidelines for RCD Snubber of Flyback / AN-4147:  Fairchild Application Notes / (app note added 6/06)

Diodes Improve Inverter Efficiency:  04/29/99 EDN-Design Ideas / (added 11/05) In "Switched-capacitor regulator provides gain" (EDN, March 13, 1998, pg 80) a switched-capacitor voltage inverter wired as a supply splitter steps a positive voltage down to an output voltage equal to half the supply voltage. The input current to such a circuit is one-half the output current; thus, you obtain higher efficiency and lower power loss than you would from a linear regulator performing the same function. You can obtain the same benefits while inverting the input voltage. Figure 1 shows the principles of operation. Typical switched-capacitor inverters contain four internal switches. Two switches charge a flying capacitor from the input voltage to ground; the other two switches discharge the capacitor, pulling the positive side to ground and generating a negative output voltage....

Double Data Rate Power Supply using the Tl5002 Voltage Tracking Regulator:  The TL5002EVM-180 synchronous buck converter provides a 12A reference design for evaluating the performance of the TL5002 PWM control IC and the TPS2837 MOSFET driver for Double Data Rate (DDR) memory applications.  (added 3/05)

Doubler/Inverter Charge Pumps Divide by Two:  Maxim Application Note #1876 (app note added 7/03)

Driving High Power LEDs:  AN-703 Analog Devices Application Note   (app note added 2/06)

Driving LEDs in Battery Operated Applications: Controlling Brightness Power Efficiently:  Maxim Application Note #1804 (app note added 7/03)