AOZ1018

Rev. 1.0 November 2006

www.aosmd.com

Page 2 of 14

Ordering Information

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Pin Configuration

Pin Description

Block Diagram

Part Number

Ambient Temperature Range

Package

Environmental

AOZ1018AI

-40°C to +85°C

SO-8

RoHS

Pin Number

Pin Name

Pin Function

1NC

Not connected.

2

VIN

Supply voltage input. When VIN rises above the UVLO threshold the device starts up.

3AGND

Reference connection for controller section. Also used as thermal connection for controller

section. Electrically needs to be connected to PGND.

4FB

The FB pin is used to determine the output voltage via a resistor divider between the output and

GND.

5

COMP

External loop compensation pin.

6EN

The enable pin is active high. Connect EN pin to VIN if not used. Do not leave the EN pin floating.

7LX

PWM output connection to inductor. Thermal connection for output stage.

8

PGND

Power ground. Electrically needs to be connected to AGND.

PGND

LX

EN

COMP

1

2

3

4

NC

VIN

AGND

FB

SO-8

(Top View)

8

7

6

5

500kHz

Oscillator

AGND

PGND

VIN

EN

FB

COMP

LX

OTP

Internal

+5V

ILimit

PWM

Control

Logic

5V LDO

Regulator

UVLO

& POR

Softstart

Reference

& Bias

0.8V

Q1

PWM

Comp

Level

Shifter

+

FET

Driver

ISen

EAmp

+

–

+

–

+

–

+

RoHS

Compliant