MAX1572

19-2837; Rev 0; 4/03 www.DataSheet4U.com KIT ATION EVALU E L B AVAILA 800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET General Description Features o o o o o o o o o o o o o o o Up to 97% Efficiency 2MHz PWM Switching 800mA Guaranteed Output Current Low 48µA Quiescent Current Power-Saving Modes: Pulse-Group, Pulse-Skip, Forced-PWM Mode 0.75V to 2.5V Preset Output Range (in 50mV Increments) Voltage-Positioning Load Transients 5mVP-P Output Ripple Tiny 2.2µH Inductor 10µF Ceramic Output Capacitor Low 0.1µA Shutdown Current No External Schottky Diode Required Soft-Start with Zero Inrush Current 170ms (min) RESET Output Small 12-Pin, 4mm x 4mm Thin QFN Package MAX1572 The MAX1572 is a fixed-frequency, synchronous stepdown DC-to-DC converter to power low-voltage microprocessor/DSP cores in portable equipment requiring high efficiency in a limited PC board area. The features are optimized for high efficiency over a wide load range, small external component size, low output ripple, and excellent transient response. The input supply voltage range is from 2.6V to 5.5V, while the output is internally fixed from 0.75V to 2.5V in 50mV increments with a guaranteed output current of 800mA. The high 2MHz switching allows tiny low-cost capacitors and a low-profile inductor, while the power-saving pulse-group mode reduces quiescent current to 48µA (typ) with light loads. To reduce noise and RF interference, the converter can be configured to provide forced-PWM operation. The MAX15...