Jun. 16. 2008 / Rev. 0.1

3/6

* This specifications are subject to be changed without notice

http://www.ad-tech.co.kr

ADT7220

Pin No.

Name

I/O

Type

Description

1

VIN

-

P

Power supply input

2

GND

-

G

Ground

3

PWM

O

D

Switching output

4

FB

I

A

Feedback voltage input

5

OUT

O

A

LDO output

6

DRV

I/O

A

LDO pass transistor drive signal

Pin Description

I : Input pin

O : Output pin

IO : Input/Output pin

P : Power pin

G : Ground pin

A : Analog pin

D : Digital pin

Functional Block Diagram

Internal

REG.

BIAS

REF

+

-

ERROR AMP

ZIN

ZFB

OSC

(500kHz)

PWM

Modulator

Pre-

DRIVER

LDO

FB

VIN

GND

PWM

DRV

OUT

+

-