APW7025 Datasheet, PDF (1/6 Pages) Anpec Electronics Coropration – Advanced PWM and Dual Linear Power Control

APW7025
Advanced PWM and Dual Linear Power Control
Features
General Description
• 3 Regulated Voltage are provided
• Switching Power for VTT(1.25V)
• Linear1 Regulator for FBVDDQ(2.5V)
• Linear2 Regulator for NVVDD(2.05V)
• 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
Applications
• Motherboard Power Regulation for Computers
• Low-Voltage Distributed Power Supplies
• VGA Card Power Regulation
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.
Pin Description
VCC
1
DRIVE2
2
NC
3
NC
4
NC
5
NC
6
NC
7
PGOOD
8
VSEN2
9
SS
10
FAULT 11
NC 12
24
UGATE
23
PHASE
22
LGATE
21
PGND
20
OCSET
19
VSEN1
18
FB
17
COMP
16
VSEN3
15
DRIVE3
14
GND
13
VAUX
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.
1
Rev.P.1 - Mar., 2001
www.anpec.com.tw