SC7102

SC7102 3A Synchronous Buck Li-ion Charger FEATURES  Handheld Battery-Powered Devices  Handheld Computers  Charging Docks and Cradles  Input voltage range 9V~20V  Dynamic input current allocation for maximum charging rate  3A Maximum Charge Current  No External MOSFETs and Blocking Diode Required  Efficiency up to 93%  Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate without Risk of Overheating  Optional Battery Temperature Monitoring Before and During Charge Automatic Sleep Mode for Low-Power  Over Current Protection  Consumption Available in ESOP8  RoHS Compliant and 100% Lead (Pb)-Free DESCRIPTION The S C7102 is a 3A Li-Ion battery charger. It utilizes a 500 KHz synchronous buck converter topology to reduce power dissipation during charging. Low power dissipation, an internal MOSFET allow a physically small charger that can be embedded in a wide range of handheld applications. The S C7102 includes complete charge termination circuitry, automatic recharge and a ±2% 8.4V float voltage. Battery charge current, charge timeout and end-of-charge indication parameters are set with external components. Additional features include shorted cell detection; temperature qualified charging and overvoltage protection. TheS C7102 i s available in a ESOP8 package APPLICATIONS  Portable Media Players  Cellular and Smart mobile phone  PDA/DSC PACKAGE ESOP8 ORDING INFORMATION Part Number Package Type Package Qty Op Temp(°C) S C7102 ESOP8 4000 -20~85 TEL:0755-27668758/29469758 -1- web:http://www.zgsemi.com www.086ic.cn SC7102 3A Synchronous Buck 2 Cells Li-ion Charger PINOUT PIN FUNCTIONS PIN NAME PIN NUMBER DESCRIPTION ESOP LX 5 Switch pin. Connect to external inductor. BST 6 Internal charge pump boost pin. Open-Drain Charge Status Output. When the battery is charging, this pin is pulled low by an STAT 3 internal N-channel MOSFET. When the S C7102detects an under voltage lockout condition, STAT is forced high impedance. NTC (Negative Temperature Coefficient) Thermistor Input. This pin senses the NTC 4 Temperature of the battery pack and stops the charger when the temperature is out of range. Connect to GND for disabling this function. VBAT 8 Battery pin. SNS 7 Detecting pin of charge current. LV5 2 5V LDO output PIN. Connect a minimum 1uF capacitor between this PIN and GND. VIN 1 GND 9 Positive Supply Voltage Input. Decouple with a 10µF or larger surface mounted Ceramic capacitor. Ground connect with ePAD.. (1) G = Ground, I = Input, O = Output, P = Power TEL:0755-27668758/29469758 -2- web:http://www.zgsemi.com www.086ic.cn SC7102 3A Synchronous Buck 2 Cells Li-ion Charger ABSOLUTE MAXIMUM RATINGS (1) Over recommended operating free-air temperature range (unless otherwise noted) PARAMETER MIN MAX ALL OTHER PINS to GND VIN, BAT, SNS, -0.3 25 BST to LX BST,LX -0.3 6.5 LX, BST to GND LX, BST -0.3 30 ESD rating, Human Body Model (HBM) VIN 3 BAT, SNS, LX, GND ,BST 3.5 ESD rating, Charging Device Model (CDM) UNIT V V kV 200 Operating Junction Temperature TJ -40 125 Storage Temperature Range Tstg -65 150 V C (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. THERMAL CHARACTERISTICS over operating free-air temperature range (unless otherwise noted) THERMAL METRIC(θJA) ESOP8 TEL:0755-27668758/29469758 Package thermal impedance(1) -3- UNIT 45 °C/W web:http://www.zgsemi.com www.086ic.cn SC7102 3A Synchronous Buck 2 Cells Li-ion Charger ELECTRICAL CHARACTERISTICS (TA=25℃, VIN = 10V, unless otherwise noted) Symbol Parameter VIN Adapter/USB Voltage Range ICC Input Supply Current VFLOAT Regulated Output (Float) Voltage VRS IBAT Program Charging Current (For RS to BAT) BAT Pin Current Condition Min Typ 9 Standby Mode VTRIKL