50 mA/500 mA, Ultralow Power Step-Down Regulator with Battery Voltage Monitor
Quad, 1 A, 5.5 V, Synchronous Step-Down Regulators with One RF LDO Regulator

Micro PMU with 800 mA Buck, 300 mA LDO, Supervisory, Watchdog, and Manual Reset
Ultralow Power Step-Down Regulator with Input Voltage Monitor and Regulation