Copyright

 ANPEC Electronics Corp.

Rev.P.1 - Mar., 2001

APW7025

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.

Advanced PWM and Dual Linear Power Control

Features

General Description

••••• Switching Power for VTT(1.25V)

••••• Linear1 Regulator for FBVDDQ(2.5V)

••••• Linear2 Regulator for NVVDD(2.05V)

••••• Voltage-Mode PWM Control

••••• PWM Output: ±1%

••••• Linear Output: ±3%

••••• High-Bandwidth Error Amplifier

••••• Full 0% to 100% Duty Ratio

••••• Constant Frequency Operation(200kHz)

••••• Programmable Oscillator from 50kHz to 1MHz

••••• Reduce External Component Count

Applications

The APW7025 integrates a PWM controller and Dual

linear controller, as well as the monitoring and pro-

tection functions into a single package , which pro-

vides three controlled power outputs with over-volt-

age and over-current protections. The PWM control-

ler regulates the DDR reference voltage with a syn-

chronous-rectified buck converter. The linear control-

ler regulates power for microprocessor core voltage

and Memory Voltage.

The precision reference and voltage-mode PWM

control provide

±2% static regulation. The linear

controller drives an external N-channel MOSFET to

provide adjustable voltage.

The APW7025 monitors all the output voltages , and

a single Power Good signal is issued when the PWM

Voltage is within 10% of the 1.25V setting and the

other output levels are above their under-voltage

thresholds. Additional built-in over-voltage protec-

tion for the PWM output uses the lower MOSFET to

prevent output voltages above 115% of the 1.25V

setting. The PWM over-current function monitors

the output current by using the voltage drop across

the upper MOSFET’s R

for a current sensing resistor.

Pin Description

VCC

DRIVE2

NC

NC

LGATE

OCSET

VSEN1

NC

NC

PGOOD

VSEN2

PGND

FB

COMP

VSEN3

GND

1

2

3

4

5

6

7

8

12

11

UGATE

10

9

16

15

14

13

17

18

19

20

24

23

22

21

VAUX

DRIVE3

PHASE

NC

SS

FAULT

NC

SOP24