General Description

The MAX781 is a system-engineered power-supply controller for subnotebook computers, PDAs, or similar battery-powered equipment. It provides high-performance, step-down (buck), pulse-width modulated (PWM) control for generating +3.3V and constant-current battery charging. Dual PCMCIA VPP outputs are powered by a regulated flyback winding. Five high-side gate drivers and a buffered analog multiplexer are also included. All functions are controlled by an SPI/Microwire™ compatible four-wire serial interface.

Features

♦ +3.3V Step-Down Controller

♦ Dual PCMCIA 2.0 Compatible VPP Outputs (0V/3.3V/5V/12V)

♦ Digitally Adjustable Switching Current Source for Battery Charging

♦ 5 High-Side Switch Gate-Driver Outputs

♦ SPI Serial Interface

♦ 300kHz Switching Frequency

♦ Oscillator SYNC Input

♦ 2.5V ±1.5 Reference Output

♦ 36-Pin SSOP Package

Applications

   Subnotebook Computers

   PDAs

   Communicating Computers

   Handy-Terminals