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MAX1773
(Rev.:2017)

Power Source Selector for Dual-Battery Systems

Maxim Integrated 

MAX1773/MAX1773A

EVALUATION KIT AVAILABLE

Power Source Selector for

Dual-Battery Systems

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 pres-

ence 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.

The MAX1773/MAX1773A are designed for use with

a buck topology charger. They provide a simple and

easily controlled solution to a difficult analog power

control problem. The MAX1773/MAX1773A provide most

of the power source monitoring and selection, freeing

the system power management microprocessor (μP) for

other tasks. This not only simplifies development of the

power management firmware for the μP but also allows

the μP to enter standby, thereby reducing system power

consumption.

The MAX1773A is recommended for new designs.

Benefits and Features

●● Patentedt 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

Ordering Information appears at end of data sheet.

tCovered by U.S. Patent number 5,764,032.

Typical Operating Circuit

AC ADAPTER

INPUT

SYSTEM LOGIC SUPPLY

FROM HOST P

TO HOST P

3.3V

BATTERY

A

BATSEL

ACPRES

BATSTAT

ACDET

PDS

VDD

MINV

MAX1773

MAX1773A

EXTLD

THMA

BATA

TCOMP

THMB

BATB

COMA

DISA

CHGA

COMB

DISB

CHGB

3.3V

BATTERY

B

STEP-DOWN

CHARGER

OUTPUT

INPUT

OUTPUT

3.3V DC-DC

CONVERTER

INPUT

SYSTEM LOAD

19-1796; Rev 2; 4/17

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