General Description

The MAX1652–MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).

Features

♦ 96 Efficiency

♦ Small, 16-Pin QSOP Package

(half the size of a 16-pin narrow SO)

♦ Pin-Compatible with MAX797 (MAX1653/MAX1655)

♦ Output Voltage Down to 1V (MAX1655)

♦ 4.5V to 30V Input Range

♦ 99 Duty Cycle for Lower Dropout

♦ 170µA Quiescent Supply Current

♦ 3µA Logic-Controlled Shutdown

♦ Dual, N-Channel, Synchronous-Rectified Control

♦ Fixed 150kHz/300kHz PWM Switching,

or Synchronized from 190kHz to 340kHz

♦ Programmable Soft Start

♦ Low-Cost Secondary Outputs (MAX1652/MAX1654)

Applications

Notebook Computers

PDAs

Cellular Phones

Hand-Held Computers

Handy-Terminals

Mobile Communicators

Distributed Power