Copyright

© ANPEC Electronics Corp.

Rev. A.10 - Aug., 2009

APW7063

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Synchronous Buck PWM and Linear Controller

•

Provide Two Regulated Voltages

- Synchronous Rectified Buck PWM Controller

- Linear Controller

•

Fast Transient Response

- 0~85% Duty Ratio

•

Excellent Output Voltage Regulation

- 0.8V Internal Reference

-

±1% Over Line Voltage and Temperature

•

Over Current Protection

- Sense Low-Side MOSFET’s R

DS(ON)

•

Under Voltage Lockout

•

Small Converter Size

- 250kHz Free-Running Oscillator

- Programmable From 70kHz to 800kHz

•

14-Lead SOIC Package

•

Lead Free and Green Devices Available

(RoHS Compliant)

Features

General Description

The APW7063 integrates PWM and linear controller, as

well as the monitoring and protection functions into a

single package. The synchronous PWM controller which

drives dual N-channel MOSFETs, which provides one

controlled power outputs with under-voltage and over-

current protections. Linear controller drives an external

N-channel MOSFET with under-voltage protection.

APW7063 provides excellent regulation for output load

variation. An internal 0.8V temperature-compensated ref-

erence voltage is designed to meet the various low out-

put voltage applications. APW7063 includes a 250kHz

free-running triangle-wave oscillator that is adjustable

from 70kHz to 800kHz.

A power-on-reset (POR) circuit limits the VCC minimum

opearting supply voltage to assure the controller working

well. Over current protection is achieved by monitoring

the voltage drop across the low side MOSFET, eliminat-

ing the need for a current sensing resistor and short cir-

cuit condition is detected through the FB pin. The over-

current protection triggers the soft-start function until the

fault events be removed, but Under-voltage protection will

shutdown IC directly.

Pull the COMP pin below 0.4V will shutdown the controller,

and both gate drive signals will be low.

Applications

•

Graphic Cards

•

Memory Power Supplies

•

DSL or Cable MODEMs

•

Set Top Boxes

•

Low-Voltage Distributed Power Supplies

Pin Configuration

1

2

3

4

5

6

7

10

9

8

11

12

13

14

RT

VREG

SS

FB

COMP

FBL

GND

VCC

DRIVE

LGATE

PGND

BOOT

UGATE

PHASE

SOP-14

(Top View)