ADP194

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THEORY OF OPERATION

The ADP194 is a high-side PMOS load switch. It is designed to

operate from a supply range from 1.1 V to 3.6 V. The PMOS load

and supports 500 mA of continuous output current. The ADP194

is a low ground current device with a nominal 4 MΩ pull-down

resistor on its enable pin.

The reverse current protection circuitry prevents current flow

backwards through the ADP194 when the output voltage is

greater than the input voltage. A comparator senses the differ-

ence between the input and output voltages. When the difference

between the input voltage and output voltage exceeds 50 mV,

opened. In other words, the gate is connected to VOUT.

The package is a space-saving 0.8 mm × 0.8 mm, 4-ball WLCSP.

GND

EN

VIN

VOUT

ADP194

LEVEL SHIFT

AND SLEW

RATE CONTROL

REVERSE

POLARITY

PROTECTION

Figure 15. Functional Block Diagram