STBC02 Li-Ion linear battery charger with LDO, load switches and reset generator Datasheet - production data Applications Smart watches and wearable devices Fitness and medical accessories Li-Ion and other Li-Poly battery rechargeable equipment Description The STBC02 is a highly integrated power management, embedding a linear battery charger, a 150 mA LDO, 2 SPDT load switches, a Features smart reset/watchdog block and a protection circuit module (PCM) to prevent the battery from Charges single-cell Li-Ion batteries with being damaged under fault conditions. CC/CV algorithm and charge termination Fast charge current up to 450 mA The STBC02 uses a CC/CV algorithm to charge Pre-charge current from 1 mA to 450 mA the battery the fast charge and the pre-charge Adjustable floating voltage up to 4.45 V current can be both independently programmed Integrated low quiescent LDO regulator using dedicated resistors. The termination current Automatic power path management is set by default, being 5% of the programmed Auto-recharge function fast charge current, but it can also be fixed to Embedded protection circuit module (PCM) different values. Likewise, the battery floating featuring battery overcharge, battery over- voltage value is programmable and can be set to discharge and battery overcurrent a value up to 4.45 V. protections The STBC02 also features a charger enable Charging timeout to terminate the charging input to stop the charging process anytime. process for safety reasons The STBC02 is automatically powered off from Shipping mode feature allows battery low leakage when over-discharged the connected battery when the IN pin is not connected to a valid power source (battery Very low battery leakage in over-discharge mode). and shutdown mode Charge/fault status output A battery under/overtemperature condition can Battery voltage pin to allow external gauging be detected by using an external circuitry (NTC Two 3 SPDT load switches thermistor). Reset generator triggered by USB detection The STBC02 draws less than 10 nA from the SWIRE allows the STBC02 functions to be connected battery in shipping mode conditions, controlled so to maximize the battery life during end product Available in Flip Chip 30, 0.4 mm pitch shelf life. The device is available in the Flip Chip package 30 package. Rugged 4 kV HBM, ESD protection on the most critical pins June 2017 DocID029261 Rev 3 1/37 www.st.com This is information on a product in full production. Contents STBC02 Contents 1 Application schematic .................................................................... 4 2 Pin configuration (top through view) ............................................. 6 3 Maximum ratings ............................................................................. 8 4 Electrical characteristics ................................................................ 9 5 Typical performance characteristics ........................................... 13 6 Functional pin description ............................................................ 17 6.1 GND, AGND .................................................................................... 17 6.2 NTC ................................................................................................. 17 6.3 ISET and IPRE ................................................................................ 17 6.4 BATMS ............................................................................................ 17 6.5 BATSNS, BATSNSFV ..................................................................... 18 6.6 BAT ................................................................................................. 18 6.7 IN .................................................................................................... 18 6.8 SYS ................................................................................................. 18 6.9 LDO ................................................................................................. 19 6.10 WAKE-UP ....................................................................................... 19 6.11 CHG ................................................................................................ 19 6.12 CEN ................................................................................................ 20 6.13 RESET NOW (RESET CLEAR), nRESET, RST PENDING ......... 20 6.13.1 Smart reset section control pins ....................................................... 20 6.13.2 Watchdog section control pins ......................................................... 21 6.14 SW1 OA, SW1 OB, SW1 I, SW2 OA, SW2 OB, SW2 I ............. 21 6.15 SW SEL ......................................................................................... 21 7 Block diagram ................................................................................ 25 8 Operation description ................................................................... 26 8.1 Power-on ......................................................................................... 26 8.2 Battery charger ................................................................................ 26 8.3 Battery temperature monitoring ....................................................... 30 8.4 Battery overcharge protection ......................................................... 30 8.5 Battery over-discharge protection ................................................... 30 8.6 Battery discharge overcurrent protection ........................................ 30 8.7 Battery fault protection .................................................................... 30 2/37 DocID029261 Rev 3