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APW7025

Description
Advanced PWM and Dual Linear Power Control
File Size59KB,6 Pages
ManufacturerAnpec
Websitehttp://www.anpec.com.tw/
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APW7025 Overview

Advanced PWM and Dual Linear Power Control

APW7025
Advanced PWM and Dual Linear Power Control
Features
3 Regulated Voltage are provided
Switching Power for VTT(1.25V)
Linear1 Regulator for FBVDDQ(2.5V)
Linear2 Regulator for NVVDD(2.05V)
General Description
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
DS(ON)
, eliminating the need
for a current sensing resistor.
Simple Single-Loop Control Design
Voltage-Mode PWM Control
Excellent Output Voltage Regulation
PWM Output:
±1%
Linear Output:
±3%
Fast Transient Response
High-Bandwidth Error Amplifier
Full 0% to 100% Duty Ratio
Power-Good Output Voltage Monitor
Over-Voltage and Over-Current Fault Monitors
Small Converter Size
Constant Frequency Operation(200kHz)
Programmable Oscillator from 50kHz to 1MHz
Reduce External Component Count
Pin Description
Applications
VCC
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
UGATE
PHASE
LGATE
PGND
OCSET
VSEN1
FB
COMP
VSEN3
DRIVE3
GND
VAUX
DRIVE2
Motherboard Power Regulation for Computers
Low-Voltage Distributed Power Supplies
VGA Card Power Regulation
NC
NC
NC
NC
NC
PGOOD
VSEN2
SS
FAULT
NC
SOP24
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.
Copyright
ANPEC Electronics Corp.
Rev.P.1 - Mar., 2001
1
www.anpec.com.tw

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