Datasheet

Data Sheet ADP190/ADP191
Rev. E | Page 9 of 16
THEORY OF OPERATION
The ADP190/ADP191 are high-side PMOS load switches. They
are designed for supply operation from 1.1 V to 3.6 V. The PMOS
load switch is designed for low on resistance, 105 mΩ at V
IN
=
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
07874-030
Figure 17. ADP190 Functional Block Diagram
GND
EN
VIN
VOUT
ADP191
LEVEL SHIFT
AND SLEW
RATE CONTROL
AND LOAD
DISCHARGE
07874-118
Figure 18. ADP191 Functional Block Diagram