800 mA charge current, 4.2 V termination
The STC4054GR: This single-cell Li-Ion linear charger delivers a programmable constant current up to 800 mA, terminating at a 4.2 V battery pack voltage. The charge current is set with an external resistor — no I2C or firmware needed, which simplifies the BOM for a dedicated charging rail. The TSOT-23-5 package (2.9 mm × 2.8 mm) keeps the footprint small enough for wearable or portable designs where board area is tight.
Surface-mount in a TSOT-23-5 package — the same 5-pin footprint as many other linear chargers, so a layout swap to a pin-compatible alternative is possible without a board spin.