Regulated Step Up Converter Provides High Efficiency Without Inductors:  Maxim Application Note #44 (app note added 7/03)

Relays: Transistor Boosted:  (Circuit added 9/04)

Scheme Provides High Side Current Sensing for White LED Drivers:  02/19/04 EDN Design Ideas  /  (added 1/05)  White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To forward-bias these LEDs, a voltage of 10 to 16V comes from an inductor-based boost regulator, such as an SP6690....

SEPIC generates 5V at 100 mA:  05/03/01 EDN-Design Ideas / (added 11/05) / PDF contains multiple circuits - scroll to find the one of interest / Some applications require an input voltage higher than the breakdown voltage of the IC supply pin. In boost converters and SEPICs (single-ended primary-inductance converters), you can separate the VIN pin of the IC from the input inductor and use a simple Zener regulator to generate the supply voltage for the IC. This design shows a SEPIC that takes a4 to28V input and generates5V at100 mA.

Short-Circuit Protection for Boost Regulators:  DN154 -  Design Notes (Linear Technology) (app note added 1/06)

Simple Boost Converter Generates ­27 and ­87V:  05/22/97 EDN-Design Ideas / (added 3/03)  

Sine wave Step Up converter uses Class E concept:  02/17/05 EDN Design Ideas  / (added 6/05)  Many power applications ranging from luminescent and fluorescent lighting to telephone-ringing voltage generators require a more or less sinusoidal-drive voltage. These applications typically require a waveform of only moderate quality, and its frequency isn't especially critical. However, avoiding waveform discontinuities that cause unwanted current peaks, excessive device dissipation, and EMC...

Single FET Controls 2nd LED Array in Switchmode LED Backlight:  Maxim APP1871: Feb03,2003 / (app note added 7/03) -- A design in which the display is backlit (or frontlit) for extended periods needs an efficient circuit that drives the LEDs with a controlled current, and eliminates the wasted power associated with current-limiting resistors. A switch-mode boost design that regulates current instead of voltage accomplishes this purpose.

Single Transistor provides short circuit protection:  10/16/03 EDN Design Ideas  /  (added 1/05)  In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provides a direct path from the input to the short circuit through the inductor and the catch diode. Regardless of current-limit protection in the IC, when a short circuit exists in the load, extremely high cu......

Step Up Converter for LED:  Melexis Application Note  (app note added 2/06)

Step Up supply charges battery while serving load :  06/08/95 EDN-Design Ideas / (added 11/05)

Step-Up/Step-Down Converter Takes 2 to 16V Inputs:  07/16/98 EDN Design Ideas / (added 11/05) The circuit in Figure 1 is a low-cost step-up/step-down dc/dc converter. By definition, its input can range above and below the regulated voltage. The circuit includes a simple switchmode boost converter (IC1) that contains a comparator normally used to detect low battery voltage. In this case, the comparator controls an external pnp transistor that operates as a linear regulator. IC1 steps up VIN (2V minimum) to the level of VX, as determined by the jumper block, J1.....

Supercapacitor Boosts Current from small Battery:  09/02/04 EDN Design Ideas  /  (added 1/05)  Some battery-powered devices require large amounts of current in a short period of time but spend most of the time in sleep (power-down) mode. The momentary large-load current demands large batteries to meet the time requirement, even though the average current consumption is low. For instance, a system operates for 1....

Supply Derives 5 and 3.3V from USB Port:  12/20/01 EDN Design Ideas  /  (added 12/04)  The circuit in Figure 1 derives its power from a USB port and produces 5 and 3.3V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs. The circuit allows the port to maintain communications while, for example, charging a lithium-ion battery. IC2 boosts the battery voltage, VBATT, to 5V, and IC3 buck-regulates that 5V output down to 3. ...