AOZ1281

Rev. 1.0 June 2011

www.aosmd.com

Page 2 of 12

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

AOZ1281DI

-40 °C to +85 °C

DFN 2 x 2, 8L

Green Product

Pin Number

Pin Name

Pin Function

1

LX

PWM output connection to inductor.

2, 3

VIN

Supply voltage input. Range from 3 V to 26 V. When VIN rises above the UVLO threshold

the device starts up. If Vin is lower than 4.5 V, an external 5 V is needed to add through

the external diode for BST.

4

EN

Enable pin. The enable pin is active high. Connect EN pin to VIN through current limiting

resistor. Do not leave the EN pin floating.

5

FB

Feedback input. It is regulated to 0.8 V. The FB pin is used to determine the PWM output

voltage via a resistor divider between the output and GND.

6, 7

GND

Ground.

8

BST

Bootstrap voltage input. High side driver supply. Connected to 10 nF capacitor between

BST and LX.

Exposed Pad

Thermal exposed pad. Pad can be connected to GND if necessary for improved thermal

performance.

DFN 2x2, 8L

(Top View)

1

2

3

4

8

7

6

5

BST

GND

GND

FB

LX

VIN

VIN

EN

Exposed

Pad