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