STw4102 Dual source USB Li-Ion charger with gas gauge Data Brief Features ■ Constant current constant voltage (CCCV) charger ■ Dual charging source (main adaptor or USB cable) ■ Fast charge current control up to 1A for main adaptor and up to 500mA for USB ■ Internal power device and sense resistor, option for external components for current higher than 1A ■ Programmable charge voltage (4.1V, 4.2V, 4.3V, 4.35V) with 1% accuracy ■ Thermal regulation ■ Trickle charge mode at low battery voltage ■ Main adaptor voltage up to 16V ■ Battery overvoltage protection at 4.7V ■ Gas gauge with 13 bit AD converter ■ Battery voltage monitor with 7-12 bit ADC ■ I2C interface for device monitoring and control ■ Charge status output pin ■ Power detection output pin ■ Programmable watchdog security timer ■ 4.7V LDO regulator (external pmos) QFN 24 Plastic Micropackage Description The STw4102 is a stand-alone constant-current constant-voltage (CCCV) linear charger dedicated for Li-Ion battery. The STw4102 allows dual charging capability using the main input adaptor up to 1A (Wall adaptor, Car adaptor) or USB cable up to 500mA without external component. Upper 1A charging is possible by adding just one external transistor. The STw4102 offers programmable fast charge current up to 1A with external resistor. A thermal regulation circuitry limits the charge current against the die high power dissipation or high ambient temperature. An end of charge output pin indicates the charge termination when the fast charge current drops below 10% of the programmed current value. Applications ■ Cellular phones (GSM, CDMA, WCDMA), PDA, MP3 players, cordless phones ■ Digital camera, USB appliances, bluetooth January 2007 The STw4102 contains an accurate gas gauge based on a 13 bit AD converter. External resistor is used between battery and ground to sense a charge/discharge curent. With a typical 30 mOhms resistor, current can be up to 2.5A. Rev 1 For further information contact your local STMicroelectronics sales office. 1/3 www.st.com 3 STw4102 Block diagram Figure 1. Internal block diagram Ordering information Table 1. Order code Part number(1) Package STw4102IQT QFN24 Tape& reel W4102I 1. Specific programming of OTP parameters are possible, for OTP customization, contact your ST local sale representative Revision history Table 2. 2/3 Document revision history Date Revision 11-Jan-2007 1 Changes Initial release. STw4102 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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