4.2V 500mA TSOT-23 Linear Voltage Regulator
IC CHARGR BATTERY L-ION TSOT23-5
Battery Charg. IC 4.5. . .6.5 V TSOT-23-5, LTC4054ES5-4.2#PBF, Linear Technology
LTC4054-4.2 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT