Copyright

 ANPEC Electronics Corp.

Rev.A.5 - Jan., 2003

APW7045

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.

The APW7045 integrates PWM controller and linear

controller, as well as the monitoring and protection

functions into a single package, which provides two

controlled power outputs with over-voltage and over-

current protections. The PWM controller regulates

the DDR termination voltage (1.25V) or GPU Voltage

(2.05V) with a synchronous-rectified buck converter.

The linear controller regulates the Memory Voltage

(2.5V). The pre cision reference and voltage-mode

PWM control provide

±1% static regulation. The lin-

ear controller drives an external N-channel MOSFET

to provide adjustable voltage. The APW7045 moni-

tors two output voltages, and a single Power Good

signal is issued when the PWM voltage is within

±10%

of the DAC setting and the lineat regulator output level

is above under-voltage threshold. Additional built-in

over-voltage protection for the PWM output uses the

lower MOSFET to prevent output voltages above 115

%

of the DAC setting. The PWM over-current function

monitors the output current by using the voltage drop

across the upper MOSFET’s R

need for a current sensing resistor.

Features

•••••

2 Regulated Voltage are provided

•••••

Simple Single-Loop Control Design

•••••

Fast Transient Response

•••••

Small Converter Size

Progammable from 50KHz to 800KHz

Applications

•••••

Motherboard Power Regulation for Computers

•••••

Low-Voltage Distributed Power Supplies

•••••

VGA Card Power Regulation

•••••

DDR SDRAM Power Regulation

General Description

Advanced PWM and Linear Power Controller

Pin Description

FB2

LG AT E

OCSE T

PG ND

UG AT E

PH AS E

DR IVE

VC C

GND

VS EN 1

FB1

CO M P

1

11

10

12

9

13

16

8

14

15

7

6

5

4

3

2

SD

SS

FAULT

PG O O D