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MIC79110

Description
Simple 1.2A Linear Li-Ion Battery Charger
File Size561KB,14 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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MIC79110 Overview

Simple 1.2A Linear Li-Ion Battery Charger

MIC79110
Simple 1.2A Linear Li-Ion Battery Charger
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 x 3mm
MLF
®
with an operating junction temperature range of
–40˚C to +125˚C.
Data sheets and support documentation can be found 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
Current limit ±5% accurate from –5°C
T
J
+ 125°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 max charge current
Excellent line and load regulation specifications
Reverse current protection
Thermal shutdown and current limit protection
Tiny 10-Pin 3mm
×
3mm MLF
®
package
Junction temperature range: –40°C to +125°C
Applications
Cellular phones
PDAs
Digital cameras
Camcorders
MP3 players
Notebook PCs
Portable Meters
Cradle chargers
Car chargers
Battery packs
___________________________________________________________________________________________________________
Typical Application
MIC79110
V
IN
SHUTDOWN
ENABLE
V
IN
SD
R
EOC
R
SET
GND
BAT
SNS
D
EOC
A
CHG
4.2V
BAT
4.2V
Li-Ion
Cell
MIC79110 Typical Application
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2007
M9999-102507

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