ADP1823

Rev. D | Page 8 of 32

Pin No.

Mnemonic

Description

24

POK1

Open-Drain Power OK Output for Channel 1. Sinks current when FB1 is out of regulation. Connect a pull-up

resistor from POK1 to VREG.

25

EN1

Enable Input for Channel 1. Drive EN1 high to turn on the Channel 1 controller, and drive it low to turn off

the Channel 1 controller. Enabling starts the internal LDO. Tie to IN for automatic startup.

26

EN2

Enable Input for Channel 2. Drive EN2 high to turn on the Channel 2 controller, and drive it low to turn off

the Channel 2 controller. Enabling starts the internal LDO. Tie to IN for automatic startup.

27

LDOSD

LDO Shut-Down Input. Only used to shut down the LDO in those applications where IN is tied directly to VREG.

Otherwise, connect LDOSD to GND or leave it open because it has an internal 100 kΩ pull-down resistor.

28

IN

Input Supply to the Internal Linear Regulator. Drive IN with 5.5 V to 20 V to power the ADP1823 from the LDO.

For input voltages between 3.7 V and 5.5 V, tie IN to VREG and PV.

29

VREG

Output of the Internal Linear Regulator (LDO). The internal circuitry and gate drivers are powered from VREG.

Bypass VREG to the ground plane with a 1 μF ceramic capacitor.

30

SS1

Soft Start Control Input. Connect a capacitor from SS1 to GND to set the soft start period.

31

TRK1

Tracking Input for Channel 1. To track a master voltage, drive TRK1 from a voltage divider to the master voltage.

If the tracking function is not used, connect TRK1 to VREG.

32

COMP1

Error Amplifier Output for Channel 1. Connect an RC network from COMP1 to FB1 to compensate Channel 1.