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The MAX8620Y micro-power-management integrated
circuit (µPMIC) powers low-voltage microprocessors or
DSPs in portable devices. The µPMIC includes a high efficiency
step-down DC-DC converter, two lowdropout
linear regulators (LDOs), a microprocessor
reset output, and power-on/off control logic. This device
maintains high efficiency at light loads with a low 115µA
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
is adjustable from 0.6V to 3.3V, with guaranteed output
current up to 500mA.
The MAX8620Y's two LDOs offer low 45µVRMS 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-bar) monitors OUT1
and warns the system of impending power loss allowing
safe shutdown. RESET-bar asserts during power-up,
power-down, shutdown, and fault conditions where
VOUT1 is below its regulation voltage.
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