AD-power-dat
LT8609/LT8609A/LT8609B == 42V, 3A Synchronous Step-Down Regulator with 2.5µA Quiescent Current
battery charger
LTC4054
LTH7 == LTH7 (officially the LTC4054ES5-4.2) is a widely used, single-cell lithium-ion battery charger IC. Packaged in a compact SOT-23-5, it is highly favored for small, portable electronics and DIY hardware projects