ADP199ACBZ-R7 datasheet(11/16 Pages) AD

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Data Sheet

ADP199

Rev. 0 | Page 11 of 16

THEORY OF OPERATION

The ADP199 is a high-side NMOS load switch controlled by

an internal charge pump. The ADP199 is designed to operate

with power supply voltages between 0.9 V and 3.6 V.

An internal charge pump biases the NMOS switch to achieve a

relatively constant, ultralow on resistance of 40 mΩ across the

entire input voltage range. The use of the internal charge pump also

allows for controlled turn-on times. The switch is controlled on/off

by the enable (EN) input and is capable of interfacing directly with

1.2 V logic signals.

The ADP199 is capable of 500 mA of continuous load current

as long as TJ is less than 85°C.

ESD protection structures are shown in the block diagram (see

Figure 29) as Zener diodes.

The ADP199 is a low quiescent current device with a nominal

4 MΩ pull-down resistor on its enable pin (EN). The package is a

space-saving 0.8 mm × 0.8 mm, 4-ball WLCSP.

GND

VIN

VOUT

ADP199

CHARGE PUMP

AND SLEW RATE

CONTROL

4Ω

Figure 29. Functional Block Diagram

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