MAX8724 Maxim Integrated Products, MAX8724 Datasheet

MAX8724

Manufacturer Part Number

MAX8724

Description

(MAX1908 - MAX87xx) Low-Cost Multichemistry Battery Chargers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8724.pdf (29 pages)

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The MAX1908/MAX8724/MAX8765 highly integrated, multi-

chemistry battery-charger control ICs simplify the construc-

tion of accurate and efficient chargers. These devices use

analog inputs to control charge current and voltage, and

can be programmed by the host or hardwired. The

MAX1908/MAX8724/MAX8765 achieve high efficiency

using a buck topology with synchronous rectification.

The MAX1908/MAX8724/MAX8765 feature input current

limiting. This feature reduces battery charge current when

the input current limit is reached to avoid overloading the

AC adapter when supplying the load and the battery

charger simultaneously. The MAX1908/MAX8724/

MAX8765 provide outputs to monitor current drawn from

the AC adapter (DC input source), battery-charging cur-

rent, and the presence of an AC adapter. The MAX1908’s

conditioning charge feature provides 300mA to safely

charge deeply discharged lithium-ion (Li+) battery packs.

The MAX1908 includes a conditioning charge feature

while the MAX8724/MAX8765 do not.

The MAX1908/MAX8724/MAX8765 charge two to four

series Li+ cells, providing more than 5A, and are avail-

able in a space-saving, 28-pin, thin QFN package (5mm

× 5mm). An evaluation kit is available to speed designs.

19-2764; Rev 4; 7/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Notebook and Subnotebook Computers

Personal Digital Assistants

Handheld Terminals

AC ADAPTER

FROM HOST μP

INPUT

LDO

Low-Cost Multichemistry Battery Chargers

Minimum Operating Circuit

________________________________________________________________ Maxim Integrated Products

DCIN

REFIN

VCTL

ICTL

ACIN

ACOK

SHDN

ICHG

IINP

CCV

CCI

CCS

REF

CSSP

MAX1908

MAX8724

MAX8765

CLS

General Description

0.01Ω

CSSN

GND

CELLS

PGND

DLOV

BATT

CSIP

CSIN

LDO

DLO

BST

DHI

Applications

TO EXTERNAL

LOAD

BATT+

10μH

0.015Ω

♦ ±0.5% Output Voltage Accuracy Using Internal

♦ ±4% Accurate Input Current Limiting

♦ ±5% Accurate Charge Current

♦ Analog Inputs Control Charge Current and

♦ Outputs for Monitoring

♦ Up to 17.6V Battery-Voltage Set Point

♦ Maximum 28V Input Voltage

♦ > 95% Efficiency

♦ Shutdown Control Input

♦ Charge Any Battery Chemistry

MAX1908ETI

MAX8724ETI

MAX8765ETI

Reference (0°C to +85°C)

Charge Voltage

PART

Current Drawn from AC Adapter

Charging Current

AC Adapter Presence

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

TOP VIEW

DLOV

CSSN

CSSP

IINP

BST

DHI

-40°C to +85°C

TEMP RANGE

Ordering Information

THIN QFN

MAX1908

MAX8724

MAX8765

Pin Configuration

28 Thin QFN

PIN-

PACKAGE

Features

GND

ICTL

REFIN

ACOK

ACIN

ICHG

SHDN

PKG CODE

T2855-6

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