MP2608

28V, 1A Dual Input

Linear Battery Charger With Timer

MP2608 Rev. 0.9

www.MonolithicPower.com

1

8/29/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2008 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The

MP2608

is

a

dual-input,

linear,

high-performance low-cost single cell Li-Ion or

Li-Polymer battery charger. It accepts two

power inputs, one from a USB (Universal BUS)

port and the other from an AC adapter. By

integrating high voltage input protection into the

charger IC, the MP2608 can tolerate an input

surge up to 28V. Due to the protection inputs

function, low-cost, large output tolerance

adapters can be used safely.

The device features constant current (CC) and

constant voltage (CV) charging modes with

programmable charge currents (100mA to

1.0A), current blocking and trickle charge. The

charge current for adapter input can be

programmed by an external resistor, while the

charge current for USB input is pre-set at

450mA.The device also provides charge status

and fault indications to the system.

For guaranteed safe operation, the MP2608

folds back charge current when the device is

heated up due to limited PCB space. Other

safety

features

are

including

battery

temperature monitoring, and programmable

timer to complete the charging cycle.

MP2608 is available in a 10-pin 3mm x 3mm

QFN package.

FEATURES

• Complete Solution for Charging Single-Cell

Lion-Ion Battery

• Input Surge Up to 28V

• Adapter and USB Input

• Programmable Charge Current: 100mA to 1.0A

• Pre-set USB Charge Current: 450mA

• Proprietary Constant Voltage Auto Recharge

• Proprietary Over-Voltage Protection

• <1µA Battery Reverse Current

• Battery Temperature Monitoring

• Thermal Protection

• Fault and Charge Status Indicators

• Internal Soft-Start

• Tiny 3mm x 3mm QFN Package

APPLICATIONS

• Cell Phones

• Digital Cameras

• Smart Phones

• PDAs

• MP3 Players

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

To System

BATT

FAULT

STATUS

IN

USB

SHDN

ICHG

IBF

TMR

GND

To AC Adapter

C1

C2

C3

R1

R4

R2

R3

D2

D1

MP2608

C4

To USB