Compact, 800 mA, 3 MHz,Simple DVS, Buck RegulatorADP2147FEATURESGENERAL DESCRIPTIONInput voltage: 2.3 V to 5.5 V The ADP2147 is a high efficiency, low quiescent current, step- Peak efficiency: 95% down (buck) dc-to-dc regulator with an output voltage that can 3 MHz fixed frequency operation be switched between two different settings under the control of Low quiescent current: 23 μA a select pin. The total solution requires only three tiny external Ultralow shutdown current: 0.2 μA (typical) components. VSEL pin for simple dynamic voltage scaling (DVS) The buck regulator automatically switches operating modes, 100% duty cycle low dropout mode depending on the load current level, to maximize efficiency. At Internal synchronous rectifier, compensation, and soft start high output loads, the buck regulator operates in PWM mode. Current overload and thermal shutdown protection When the load current falls below a predefined threshold, the Small, 6-ball, 1 mm × 1.5 mm WLCSP package regulator operates in power save mode (PSM), improving the