L6924U USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer Datasheet - production data Digital still cameras Standalone chargers Wireless appliances VFQFPN16 Table 1. Device summary Order code Package Packing L6924UTR VFQFPN16 Tape and reel Features Fully integrated solution, with power MOSFET, reverse blocking diode, sense resistor, and thermal protection Charges single-cell Li-Ion batteries from selectable AC adapter or USB input Programmable charge current up to 1 A in AC adapter mode Programmable charging current in USB mode for both high-power and low-power inputs 4.2 V output voltage with 1% accuracy Linear or quasi-pulse operating mode Closed-loop thermal control Programmable end-of-charge current Programmable charge timer (NTC) or (PTC) thermistor interface for battery temperature monitoring and protection Status outputs to drive LEDs or to interface with a host processor Small VFQFPN 16-lead package (3x3 mm) Applications GPS and MP3 players USB-powered devices January 2019 DocID14716 Rev 4 1/41 This is information on a product in full production. www.st.comContents L6924U Contents 1 Description . 4 2 Pin description . 5 2.1 Pin description 5 3 Maximum ratings 7 4 Electrical characteristics . 8 5 Block diagram . 10 6 Operation description . 11 6.1 Linear mode . 12 6.2 Quasi-pulse mode 14 7 Application information: charging process . 17 7.1 Pre-charge phase . 17 7.2 AC or USB mode . 18 7.3 Fast charge phase 18 7.4 End-of-charge current . 20 7.5 Recharge flow chart . 21 7.6 Recharge threshold . 21 7.7 Maximum charging time 22 8 Application information: monitoring and protection 23 8.1 NTC thermistor . 23 8.2 Battery absence detection 27 8.3 Status pins 28 8.4 Shutdown . 29 9 Additional application information 30 9.1 Selecting the input capacitor 30 9.2 Selecting the output capacitor . 30 2/41 DocID14716 Rev 4