General Description

The MAX1637 synchronous, buck, switch-mode power supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V.

Features

♦ ±2 DC Accuracy

♦ 0.1 (typ) DC Load Regulation

♦ Adjustable Switching Frequency to 350kHz

♦ Idle Mode™ Pulse-Skipping Operation

♦ 1.10V to 5.5V Adjustable Output Voltage

♦ 3.15V Minimum IC Supply Voltage (at VCC pin)

♦ Internal Digital Soft-Start

♦ 1.1V ±2 Reference Output

♦ 1μA Total Shutdown Current

♦ Output Overvoltage Crowbar Protection

♦ Output Undervoltage Shutdown (foldback)

♦ Tiny 16-Pin QSOP Package

Applications

Notebook Computers

Subnotebook Computers

Handy-Terminals, PDAs