MIC79110_13 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – 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 × 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
• 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 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
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 24, 2013
Revision 2.1