Data Sheet

ADP1290

THEORY OF OPERATION

The ADP1290 is a high-side NMOS load switch, controlled by

an internal charge pump. The ADP1290 is designed to operate

with power supply voltages between 2.3 V and 13.2 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 controlled turn on times. Turning the NMOS switch on

and off is controlled by the enable input, EN, which is capable of

interfacing directly with 1.2 V logic signals.

GND

EN

VIN

VOUT

CHARGE PUMP

AND

SLEW RATE CONTROL

Figure 20. Functional Block Diagram

The ADP1290 is capable of 2 A of continuous current as long as

decreases linearly to 1.6 A.

ESD protection structures are shown in the block diagram as

Zener diodes.

The ADP1290 is a low quiescent current device with a weak 15 nA

pull-down current sink on its enable pin (EN).

The ADP1290 is available in a space-saving 1.0 mm × 1.5 mm,

0.5 mm pitch, 6-ball WLCSP.

Rev. 0 | Page 9 of 12