ADP190/ADP191

Rev. D | Page 9 of 16

THEORY OF OPERATION

The ADP190/ADP191are high-side PMOS load switches. They

are designed for supply operation from 1.1 V to 3.6 V. The PMOS

1.8 V, and supports 500 mA of continuous current. It is a low

ground current device with a nominal 4 MΩ pull-down resistor

on its enable pin. The package is a space-saving 0.8 mm ×

0.8 mm, 4-ball WLCSP.

The ADP191 incorporates an internal output discharge resistor

to discharge the output capacitance when the ADP191 output is

disabled. The ADP191 also contains circuitry to limit the switch

turn-on slew rate to limit the inrush current.

GND

EN

VIN

VOUT

ADP190

LEVEL SHIFT

AND SLEW

RATE CONTROL

Figure 17. ADP190 Functional Block Diagram

GND

EN

VIN

VOUT

ADP191

LEVEL SHIFT

AND SLEW

RATE CONTROL

AND LOAD

DISCHARGE

Figure 18. ADP191 Functional Block Diagram