MIC79110_07 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – Simple 1.2A Linear Li-Ion Battery Charger

MIC79110
Simple 1.2A Linear Li-Ion Battery Charger
General Description
Features
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.
• 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
Data sheets and support documentation can be found on • Cellular phones
Micrel’s web site at www.micrel.com.
• PDAs
• Digital cameras
• Camcorders
• MP3 players
• Notebook PCs
• Portable Meters
• Cradle chargers
• Car chargers
• Battery packs
___________________________________________________________________________________________________________
Typical Application
V_IN
SHUTDOWN
ENABLE
MIC79110
V_IN
BAT
SD
SNS
R_EOC
D_EOC
R_SET
A_CHG
GND
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 [phone] • fax + 1 [phone] • http://www.micrel.com
October 2007
M9999-102507