MIC79110 Simple 1.2A Linear Li-ion Battery Charger Features General Description Input voltage range: 2.5V to 16V The Micrel MIC79110 is a simple and accurate lithium-ion High output voltage accuracy of 0.75% over 5C to battery charger. The part features a built-in pass transistor, +60C precision programmable current limiting (5%), and precision voltage termination (0.75% over temperature). Current limit 5% accurate from 5C T + 125C J The MIC79110 packs full functionality into a small space. Programmable end-of-charge flag Other features of the MIC79110 include two independent Analog output proportional to output current indicators: a digital end-of-charge signal that is Adjustable and fixed 4.2V output programmable with a resistor-to-ground and an analog Low dropout voltage of 550mV at 700mA load, over current output that is proportional to the output current, temperature allowing for monitoring of the actual charging current. 1.2A maximum charge current Additional features include very low dropout (550mV over Excellent line and load regulation specifications the temperature range), thermal shutdown, and reverse polarity protection. In the event the input voltage to the Reverse-current protection charger is disconnected, the MIC79110 also provides Thermal-shutdown and current-limit protection minimal reverse-current and reversed-battery protection. Tiny 10-pin 3mm 3mm DFN package Available in both xed 4.2V and adjustable outputs, the Junction temperature range: 40C to +125C MIC79110 is offered in the leadless 10-pin 3mm 3mm DFN with an operating junction temperature range of Applications 40C to +125C. Cellular phones and PDAs Datasheets and support documentation are available on Digital cameras and camcorders Micrels web site at: www.micrel.com. 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 +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC79110 Ordering Information Marking Part Number Voltage Junction Temperature Range Package (1) Code MIC79110-4.2YML L942 4.2V 40 to +125C 10-Pin 3mm 3mm DFN MIC79110YML L9AA Adjustable 40 to +125C 10-Pin 3mm 3mm DFN 1. Pb-Free Y indicator is added to the device mark after logo. Pin Configuration Fixed Output Adjustable Output 10-Pin 3mm 3mm DFN (ML) 10-Pin 3mm 3mm DFN (ML) Pin Description Pin Number Pin Name Pin Function 1 SD Shutdown Input. Logic HIGH = Off Logic LOW = On. Current limit: Sets constant current limit via an external resistor to ground. 2 RSET I = (0.2V/R ) 1000. RSET SET 3 SNS (Fixed voltage only): Sense output, connect directly to battery. 3 ADJ (Adjustable voltage only): Feedback input. 4 BAT Battery Terminal. Connect to single-cell lithium-ion battery. 5, 6 VIN Input supply pin. Analog Charge Indicator Output: Current source whos output current is equal to 1/1000 of the 7 ACHG BAT pin current. Digital End-of-Charge Output: N-Channel open-drain output. LOW indicates charging, a current that is higher than the programmed current set by R is charging the battery. When the current EOC 8 DEOC drops to less than the current set by R , the output goes high impedance, indicating end-of- EOC charge. End-of-Charge Set: Sets end-of-charge current threshold via an external resistor to ground. 9 REOC IEOC = (0.2V/ REOC) 1000. 10 GND Ground Revision 2.1 September 23, 2013 2