Data Sheet

ADP1190A

THEORY OF OPERATION

The ADP1190A 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. When the device 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, hold EN low for

5 ms before the device is enabled. If EN transitions high before

this timeout, the counter is reset and starts a new 5 ms count.

The signal paths are N-channel MOSFETs with 3 Ω on resistance.

Break-before-make logic control ensures that the active pull-down

is off before the signal path is enabled.

The ADP1190A also has an internal charge pump that provides

a regulated voltage at the gates of the N-channel MOSFETs,

resulting in a more stable signal switch on resistance over

different input voltages and temperature.

Figure 21. Block Diagram with ESD Protection Devices

S1

S2

S3

S4

IN

5ms

DEBOUNCE

LOAD

SWITCH

ADP1190A

CHARGE

PUMP

EN

T1

T2

T3

T4

OUT

GND

ON

OFF

Rev. 0 | Page 9 of 12