General Description

The MAX1773/MAX1773A highly integrated ICs serve as the control logic for a system with multiple power sources. They directly drive external P-channel MOSFETs to select from an AC adapter and dual battery sources for charge and discharge. The selection is made based on the presence of the power sources and the state of the batteries. The MAX1773/MAX1773A detect low battery conditions using integrated analog comparators and check for the presence of a battery by using battery thermistor outputs.

Features

♦ Patented† 7-MOSFET Topology Offers Low-Cost Solution

♦ Automatically Detects and Responds to:

Low Battery Voltage Condition

Battery Insertion and Removal

AC Adapter Presence

♦ Direct Drive of P-Channel MOSFETs

♦ Simplifies Power Management µP Firmware

♦ Extends Battery Life by Allowing Power Management µP to Enter Standby

♦ 4.75V to 28V AC Adapter Input Voltage Range

♦ Integrated LDO with 1mA Drive Capability

♦ Small Footprint 20-Pin TSSOP Package

Applications

Notebook and Subnotebook Computers

PDAs and Handy-Terminals

Internet Tablets

Dual-Battery Portable Equipment