Data Sheet

ADP1190

Rev. 0 | Page 9 of 12

THEORY OF OPERATION

The ADP1190 is a high-side load switch integrated with four

signal switches. The load switch and signal switches are turned

on by a low signal on the EN pin. A 4 MΩ pull-up resistor on

this pin allows it to be driven by an open-collector or mechani-

cal switch. When the part is disabled, the T1 to T4 pins are

actively pulled down with a nominal resistance of 215 Ω. There

is a 5 ms debounce counter on EN for use with a mechanical

EN switch. That is, EN must be held low for 5 ms before the

part is enabled. If EN transitions high before this timeout, the

counter is reset and starts a new 5 ms count.

The signal path is controlled by a PMOS/NMOS transmission

gate with an on resistance of 2 Ω. Break-before-make logic

control ensures that the active pull-down is off before the signal

path is enabled.

In addition to these features, the ADP1190 occupies minimal

printed circuit board (PCB) space with an area less than

an ultrasmall 1.2 mm × 1.6 mm, 12-ball, 0.4 mm pitch WLCSP.

Figure 21. Block Diagram with ESD Protection Devices

4MΩ

T1

S1

P

N

T2

S2

P

N

T3

S3

P

N

T4

GND

OUT

S4

P

N

EN

5ms

DEBOUNCE

IN

OFF

ON