General Description

The MAX1776 high-efficiency step-down converter provides an adjustable output voltage from 1.25V to VIN from supply voltages as high as 24V. An internal current-limited 0.4Ω MOSFET delivers load currents up to 600mA. Operation to 100 duty cycle minimizes dropout voltage (240mV at 600mA).

Features

♦ Fixed 5V or Adjustable Output

♦ 4.5V to 24V Input Voltage Range

♦ Up to 600mA Output Current

♦ Internal 0.4Ω P-Channel MOSFET

♦ Efficiency Over 95

♦ 15µA Quiescent Supply Current

♦ 3µA Shutdown Current

♦ 100 Maximum Duty Cycle for Low Dropout

♦ Current-Limited Architecture

♦ Thermal Shutdown

♦ Small 8-µMAX Package

Applications

Notebook Computers

Distributed Power Systems

Keep-Alive Supplies

Hand-Held Devices