General Description

The MAX1927/MAX1928 800mA step-down converters power low-voltage microprocessors in compact equipment requiring the highest possible efficiency. The MAX1927/MAX1928 are optimized for generating low output voltages (down to 750mV) at high efficiency using small external components. The supply voltage range is from 2.6V to 5.5V and the guaranteed minimum output current is 800mA. 1MHz pulse-width modulation (PWM) switching allows for small external components. A unique control scheme minimizes ripple at light loads, while maintaining a low 140µA quiescent current.

Features

♦ 800mA Output Current

♦ Output Voltages from 0.75V to 5V

♦ 2.6V to 5.5V Input Voltage Range

♦ Power-OK Output

♦ No Schottky Diode Required

♦ Selectable Forced PWM Operation

♦ 1MHz Fixed-Frequency PWM Operation

♦ 140µA Quiescent Current

♦ Soft-Start

♦ 10-Pin µMAX Package