MAX1908 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1908

Low-Cost Multichemistry Battery Chargers

Maxim Integrated 

EVALUATION KIT AVAILABLE

AVAILABLE

MAX1908/MAX8724/

MAX8765/MAX8765A

Low-Cost Multichemistry Battery Chargers

General Description

The MAX1908/MAX8724/MAX8765/MAX8765A highly

integrated, multichemistry battery-charger control ICs

simplify the construction of accurate and efficient charg-

ers. These devices use analog inputs to control charge

current and voltage, and can be programmed by the host

or hardwired. The MAX1908/MAX8724/MAX8765/

MAX8765A achieve high efficiency using a buck topology

with synchronous rectification.

The MAX1908/MAX8724/MAX8765/MAX8765A 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/MAX8765A provide out-

puts to monitor current drawn from the AC adapter (DC

input source), battery-charging current, and the pres-

ence 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/MAX8765A do not.

The MAX1908/MAX8724/MAX8765/MAX8765A charge two

to four series Li+ cells, providing more than 5A, and are

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

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

Applications

Notebook and Subnotebook Computers

Personal Digital Assistants

Handheld TermFinualns ctional Diagrams

Minimum Operating Circuit

AC ADAPTER

INPUT

0.01Ω

TO EXTERNAL

LOAD

CSSP

DCIN

REFIN

CSSN

CELLS

LDO

VCTL

LDO

ICTL

BST

DLOV

FROM HOST µP

ACIN

MAX1908

ACOK MAX8724 DHI

MAX8765

SHDN MAX8765A LX

ICHG

DLO

IINP

PGND

10µH

CCV

CSIP

CCI

0.015Ω

CCS

CSIN

BATT

BATT+

Pin Configurations appREeF arCLaS t eGnNDd of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

Features

o ±0.5% Output Voltage Accuracy Using Internal

Reference (±0.4% for MAX8765A, 2-/3-Cell Only)

o ±4% Accurate Input Current Limiting

o ±5% Accurate Charge Current

o Analog Inputs Control Charge Current and

Charge Voltage

o Outputs for Monitoring

Current Drawn from AC Adapter

Charging Current

AC Adapter Presence

o Up to 17.6V Battery-Voltage Set Point

o Maximum 28V Input Voltage

o > 95% Efficiency

o Shutdown Control Input

o Charge Any Battery Chemistry

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

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX1908ETI+

-40°C to +85°C 28 Thin QFN-EP*

MAX8724ETI+

-40°C to +85°C 28 Thin QFN-EP*

MAX8765ETI+

-40°C to +85°C 28 Thin QFN-EP*

MAX8765AETI+

-40°C to +85°C 28 Thin QFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Pin Configuration

TOP VIEW

DLOV 22

LX 23

BST 24

DHI 25

CSSN 26

CSSP 27

IINP 28

+

21 20 19 18 17 16 15

MAX1908

MAX8724

MAX8765

MAX8765A

1 23 4 567

14 GND

13 ICTL

12 REFIN

11 ACOK

10 ACIN

9 ICHG

8 SHDN

THIN QFN

For pricing, delivery, and ordering information, please contact Maxim Direct

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

19-2764; Rev 5; 11/09

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