MIC79110

Simple 1.2A Linear Li-ion Battery Charger

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

September 24, 2013

Revision 2.1

General Description

The Micrel MIC79110 is a simple and accurate lithium-ion

battery charger. The part features a built-in pass transistor,

precision programmable current limiting (±5%), and

precision voltage termination (±0.75% over temperature).

The MIC79110 packs full functionality into a small space.

Other features of the MIC79110 include two independent

indicators: a digital end-of-charge signal that is

programmable with a resistor-to-ground and an analog

current output that is proportional to the output current,

allowing for monitoring of the actual charging current.

Additional features include very low dropout (550mV over

the temperature range), thermal shutdown, and reverse

polarity protection. In the event the input voltage to the

charger is disconnected, the MIC79110 also provides

minimal reverse-current and reversed-battery protection.

Available in both fixed 4.2V and adjustable outputs, the

MIC79110 is offered in the leadless 10-pin 3mm × 3mm

DFN with an operating junction temperature range of

–40˚C to +125˚C.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

•

Input voltage range: 2.5V to 16V

•

High output voltage accuracy of ±0.75% over –5°C to

+60˚C

•

•

Programmable end-of-charge flag

•

Analog output proportional to output current

•

Adjustable and fixed 4.2V output

•

Low dropout voltage of 550mV at 700mA load, over

temperature

•

1.2A maximum charge current

•

Excellent line and load regulation specifications

•

Reverse-current protection

•

Thermal-shutdown and current-limit protection

•

Tiny 10-pin 3mm × 3mm DFN package

•

Junction temperature range: –40°C to +125°C

Applications

•

Cellular phones and PDAs

•

Digital cameras and camcorders

•

MP3 players

•

Notebook PCs

•

Portable Meters

•

Cradle/car chargers, and battery packs

Typical Application