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STC4054 Li-Ion Battery Charger Specifications

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Key Features: Programmable charge current up to 800mA with 4.2V output voltage
No external MOSFET or blocking diode required
Constant current/voltage operation with thermal regulation
Charges single cell Li-Ion batteries directly from USB port
Operation Modes: Charges in constant current mode above 2.9V battery voltage
Transitions to constant voltage mode near 4.2V float voltage
Automatically terminates when current drops to 1/10 programmed value
Features soft start and automatic recharge capabilities
Safety and Protection: Internal thermal feedback loop protects against overheating
Reduces supply current to 25µA in shutdown mode
Includes charge status indicator and current monitor
Operates within USB power specifications
Package and Design: Available in TSOT23-5L package with lead-free second level
Requires 1µF bypass capacitor for battery connection
Thermal management crucial for optimal performance
Suitable for cellular phones, PDAs, and Bluetooth applications