MAX8620Y

The MAX8620Y micro-power-management integrated circuit (PMIC) powers low-voltage microprocessors or DSPs in portable devices. The PMIC MAX8620Y includes a highefficiency step-down DC-DC converter, two lowdropout linear regulators (LDOs), a microprocessor reset output, and power-on/off control logic. This MAX8620Ymaintains high efficiency at light loads with a low 115A supply current, and its miniature TDFN package makes it ideal for portable devices.

The MAX8620Y's step-down DC-DC converter utilizes a proprietary 4MHz hysteretic-PWM control scheme that allows for ultra-small external components. Internal synchronous rectification improves efficiency and eliminates the external Schottky diode that is required in conventional step-down converters. The output voltage of MAX8620Y is adjustable from 0.6V to 3.3V, with guaranteed output current up to 500mA.

The MAX8620Y's two LDOs offer low 45VRMS output noise and a low dropout of only 200mV at 200mA. Each LDO delivers at least 300mA of continuous output current. The output voltages are pin selectable from 1.8V to 3.3V for flexibility.

A microprocessor reset output (RESET) of MAX8620Y monitors OUT1 and warns the system of impending power loss allowing safe shutdown. RESET asserts during power-up, power-down, shutdown, and fault conditions where VOUT1 is below its regulation voltage.