Low drop-out (LDO) voltage regulator Analog Integrations

AIC1531 is a dual input regulator with VAUX
switch capable of delivering 3.3V/500mA
continuously. The output power is provided from
three independent input voltage sources on a
prioritized basis. Power is always taken in priority
using the following order VCC, VSBY, and VAUX.
The AIC1531 meets Intel’s “ Instantly Available ”
power requirements, which follows the
“Advanced Configuration and Power
Interface“ (ACPI) standards. When either VCC or
VSBY is present, the device automatically enables
the regulator and produces a stable 3.3V output
VOUT. When only VAUX (3.3V) is present, the
device provides a low impedance direct
connection (120mW typ.) from VAUX to VOUT.
The AIC1531 also prevents excessive current
from flowing VOUT to either input voltage or
ground when the output voltage is higher than
the input voltage.
All the necessary control circuitry needed to
provide a smooth and automatic transition
between all the three supplies has been
incorporated. This allows both VCC and VSBY to
be dynamically switched without loss of output
voltage.

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