MAX8724ETI

Low-Cost Multichemistry Battery Chargers

General Description

The MAX1908/MAX8724 highly integrated, multichemistry

battery-charger control ICs simplify the construction 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 achieve high efficiency using a buck topology

with synchronous rectification.

The MAX1908/MAX8724 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 provide outputs

to monitor current drawn from the AC adapter (DC input

source), battery-charging current, 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 does not.

The MAX1908/MAX8724 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

Hand-Held Terminals

Features

 ±0.5% Output Voltage Accuracy Using Internal

Reference (0°C to +85°C)

 ±4% Accurate Input Current Limiting

 ±5% Accurate Charge Current

 Analog Inputs Control Charge Current and

Charge Voltage

 Outputs for Monitoring

Current Drawn from AC Adapter

Charging Current

AC Adapter Presence

 Up to 17.6V Battery-Voltage Set Point

 Maximum 28V Input Voltage

 >95% Efficiency

 Shutdown Control Input

 Charges Any Battery Chemistry

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

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