Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump

The MAX1595 charge-pump regulator generates either 3.3V or 5V from a 1.8V to 5.5V input. The unique control architecture allows the regulator to step up or step down the input voltage to maintain output regulation. The 1MHz switching frequency, combined with a unique control scheme, allows the use of a ceramic capacitor as small as 1µF for 125mA of output current. The complete regulator requires three external capacitors—no inductor is needed. The MAX1595 is specifically designed to serve as a high-power, high- efficiency auxiliary supply in applications that demand a compact design. The MAX1595 is offered in space-saving 8-pin µMAX® and high-power 12-pin TQFN packages.

Applications

* 3.3V to 5V Local Conversion Applications * 3V to 5V GSM SIMM Cards * Backup Battery Boost Converters * Battery-Powered Applications * Flash Memory Supplies * Miniature Equipment * PCMCIA Cards * White LED Power

* Ultra-Small: Requires Only Three Ceramic Capacitors

* No Inductors Required

* Up to 125mA Output Current

* Regulated ±3% Output Voltage

* 1MHz Switching Frequency

* 1.8V to 5.5V Input Voltage

* 220µA Quiescent Current

* 0.1µA Shutdown Current

* Load Disconnect in Shutdown