ADP2118,pdf datasheet (Step-Do

The ADP2118 is a low quiescent current, synchronous, step-down,
dc-to-dc converter in a compact 4mm × 4mm LFCSP_WQ package. It uses a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and
transient response. Under light loads, the ADP2118 can be
configured to operate in pulse frequency modulation (PFM)
mode that reduces switching frequency to save power. The ADP2118 runs from input voltages of 2.3 V to 5.5 V. The
output voltage of the ADP2118ACPZ-R7 is adjustable from 0.6 V to input voltage (VIN), and the ADP2118ACPZ-x.x-R7 are
available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V,
1.5 V, 1.2 V, and 1.0 V. The ADP2118 requires minimal external
parts and provides a high efficiency solution with its integrated power switch, synchronous rectifier, and internal compensation. The IC draws less than 3 μA from the input source when it is
disabled. Other key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP),
and thermal shutdown (TSD).