Ultralow Power Step-Down Regulator with Input Voltage Monitor and Regulation

2 A/1.2 A DC-to-DC Switching Regulator with Independent Positive and Negative Outputs
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