MP2681B

CC/CV Controller

with Full Protection and Indication

One Chip Solution for Power Tools Applications

MP2681B Rev.1.0

www.MonolithicPower.com

1

12/22/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2681B is a highly integrated Li-ion or Li-

polymer switch-mode battery-charge controller

with full protection and status indication. This

part integrates a precision voltage reference

and charge status indications suitable for AC

adapter input and cradle charger applications.

The MP2681B detects automatically the battery

cell through a battery ID resistor and regulates

the

battery

voltage

according

to

the

corresponding cell configurations: 3S, 4S, and

5S. Then, the AC adapter output is regulated

automatically according to the chosen battery

configuration. Additionally, if the battery pack

does not have an ID resistor, the charge

termination voltage can be configured by setting

a dedicated voltage to the ID pin, according to

configuration. The MP2681B charges the

battery in three phases: pre-charge, constant

current and constant voltage. Charge is

terminated when the current reaches a

minimum set level. An internal charge timer

provides

safety

back-up.

The

MP2681B

provides a fixed pre-charge mode for deeply-

discharged batteries and safety features that

include battery temperature monitoring, NTC

control, charge time-out, and fault control.

MP2681B is available in a 16-pin SOIC

package.

FEATURES

• Constant Voltage and Constant-Current

Control

• Pre-Charge Mode for Deeply-Discharged

Batteries

• Automatic Battery-Cell Detection

• Two 1MHz Bandwidth Operational

Amplifiers Output Connected with OR Logic

• Wide Input-Voltage Range: 5.0V to 30V

• Auto-Recharge

• Charge On/Off Control

• Programmable Internal Timer

• Battery Temperature Monitoring

• Charge-Status Indication

• Power-Line Fault Detection

• Over-Temperature Protection

• 16-pin SOIC Package

APPLICATIONS

• Battery Charger for Portable Tools

• Stand-Alone Fast Charger

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Quality Assurance. “MPS” and “The

Future of Analog IC Technology” are Registered Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION