AOZ1053PI

Rev. 0.4 September 2012

www.aosmd.com

Page 2 of 14

Ordering Information

AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.

Pin Configuration

Pin Description

Part Number

Ambient Temperature Range

Package

Environmental

AOZ1053PI

-40 °C to +85 °C

EPAD SO-8

Green Product

1

2

3

4

PGND

VIN

AGND

FB

Exposed Pad SO-8

(Top View)

PAD

(LX)

NC

SS

EN

COMP

8

7

6

5

Pin Number

Pin Name

Pin Function

1

PGND

Power Ground. PGND needs to be electrically connected to AGND.

2

VIN

Supply Voltage Input. When VIN rises above the UVLO threshold and EN is logic high,

the device starts up.

3

AGND

Analog Ground. AGND is the reference point for controller section. AGND needs to be

electrically connected to PGND.

4

FB

Feedback Input. The FB pin is used to set the output voltage via a resistive voltage divider

between the output and AGND.

5

COMP

External Loop Compensation Pin. Connect a RC network between COMP and AGND to

compensate the control loop.

6

EN

Enable Pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the

device. If on/off control in not needed, connect EN to VIN and do not leave it open.

7

SS

Soft-Start Pin. 5µA current charging current.

8

NC

No Connect Pin. Pin 8 is not internally connected. Connect this pin externally to LX and

use it for better thermal performance.

Exposed pad

LX

Switching Node. LX is the drain of the internal PFET. LX is used as the thermal pad of the

power stage.