MIC79110 Simple 1.2A Linear Li-Ion Battery Charger - Micrel - #1

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MIC79110 Simple 1.2A Linear Li-Ion Battery Charger 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 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 TJ + 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 VIN SD REOC RSET BAT SNS DEOC ACHG GND MIC79110 4.2V Li-Ion Cell VIN SHUTDOWN ENABLE 4.2VBAT MIC79110 Typical Application