MAX1644 datasheet(1/32 Pages) MAXIM

Part #	MAX1644

Description	Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting

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Manufacturer	MAXIM [Maxim Integrated Products]

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General Description

The MAX1645 is a high-efficiency battery charger

capable of charging batteries of any chemistry type. It

uses the Intel System Management Bus (SMBus

™) to

control voltage and current charge outputs.

When charging lithium-ion (Li+) batteries, the MAX1645

automatically transitions from regulating current to reg-

ulating voltage. The MAX1645 can also limit line input

current so as not to exceed a predetermined current

drawn from the DC source. A 175sec charge safety

timer prevents “runaway charging” should the

MAX1645 stop receiving charging voltage/current com-

mands.

The MAX1645 employs a next-generation synchronous

buck control circuitry that lowers the minimum input-to-

output voltage drop by allowing the duty cycle to

exceed 99%. The MAX1645 can easily charge one to

four series Li+ cells.

Applications

Notebook Computers

Point-of-Sale Terminals

Personal Digital Assistants

Features

o Input Current Limiting

o 175sec Charge Safety Timeout

o 128mA Wake-Up Charge

o Charges Any Chemistry Battery:

Li+, NiCd, NiMH, Lead Acid, etc.

o Intel SMBus 2-Wire Serial Interface

o Compliant with Level 2 Smart Battery Charger

Spec. Rev. 1.0

o +8V to +28V Input Voltage Range

o Up to 18.4V Battery Voltage

o 11-Bit Battery Voltage Setting

o ±0.8% Output Voltage Accuracy with Internal

Reference

o 3A max Battery Charge Current

o 6-Bit Charge Current Setting

o 99.99% max Duty Cycle for Low-Dropout Operation

o Load/Source Switchover Drivers

o >97% Efficiency

Advanced Chemistry-Independent, Level 2

Battery Charger with Input Current Limiting

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Maxim Integrated Products

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CVS

PDS

CSSP

CSSN

BST

DHI

INT

LX

DLOV

DLO

PGND

CSIP

CSIN

PDL

SDA

SCL

THM

VDD

DAC

BATT

GND

CCV

CCI

CCS

REF

CLS

LDO

DCIN

QSOP

TOP VIEW

MAX1645

19-1566; Rev 0a; 10/99

PART

MAX1645EEI

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

28 QSOP

Typical Operating Circuit appears at end of data sheet.

SMBus is a trademark of Intel Corp.

Pin Configuration

Ordering Information

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