STC4054 800mA Standalone linear Li-Ion Battery charger with thermal regulation Feature summary Programmable charge current up to 800mA No external MOSFET, sense resistors or blocking diode required Constant current / constant voltage operation with thermal regulation to maximize charge rate without risk of overheating Charges single cell li-ion batteries directly from USB port TSOT23-5L Preset 4.2V charge voltage with 1% accuracy Automatic recharge Single charge status output pin Charge current monitor output for gas gauging C/10 Charge termination required and its ThinSOT package make it ideally suited for portable applications. 25A supply current in shutdown mode The STC4054 is designed to work within USB Low battery voltage detect for precharge power specifications. An internal block regulates setting the current when the junction temperature Soft-start limits inrush current increases, in order to protect the device when it TSOT23-5L package operates in high power or high ambient temperature. Applications The charge voltage is fixed at 4.2V, and the charge current limitation can be programmed Cellular telephones using a single resistor connectd between PROG PDAs pin and GND. The charge cycle is automatically terminated when the current flowing to the battery Bluetooth applications is 1/10 of the programmed value. If the external Battery-powered devices adaptor is removed, the STC4054 turns off and a 2A current can flow from the battery to the Description device. The device can be put into Shutdown Mode, reducing the supply current to 25A. The The STC4054 is a constant current/constant device also has a charge current monitor, under voltage charger for single cell Li-Ion batteries. No voltage lockout, automatic recharge. The device is external sense resistor or blocking diode is packaged in TSOT23-5L. Order code Part number Package Packaging STC4054GR TSOT23-5L 3000 parts per reel September 2006 Rev. 1 1/17 www.st.com 17STC4054 Contents 1 Block diagram 3 2 Pin configuration . 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Typical performance characteristics 8 6 Application information . 10 6.1 Charge cycle 10 6.2 V Pin . 10 CC 6.3 Power ON pin 10 6.4 CHRG pin . 10 6.5 PROG pin . 11 6.6 Programming charge current 11 6.7 BAT pin . 11 6.8 Charge termination 11 6.9 Automatic recharge . 11 6.10 Soft start 12 6.11 Thermal regulation 12 6.12 Power dissipation . 12 6.13 Stability considerations . 12 7 Package mechanical data 13 8 Revision history . 16 2/17