Nordic Semiconductor nPM1100-CAAA-R7, Battery Charge Controller IC, 4.1 V, 150mA, WLCSP

The nPM1100 is an integrated Power Management IC (PMIC) with a linear-mode lithium-ion/lithium-polymer battery charger in a compact 2.1x2.1 mm WLCSP package. It has a highly efficient, dual-mode configurable output DC/DC buck regulator. It is compatible with all nRF52 and nRF53 Series SoCs and supports charging batteries at up to 500 mA through USB, and also delivers up to 150 mA of current to power external components with regulated voltage.

USB interface
Ultra-high efficiency prolongs battery life or allows for use of smaller and less costly batteries
No software control