APW7035 Datasheet, PDF (1/11 Pages) Anpec Electronics Coropration – Advanced PWM and Linear Power Control

APW7035
Advanced PWM and Linear Power Control
Features
General Description
• 2 Regulated Voltage are provided
− Switching Power for Fixed Voltage (1.25V /
2.05V) or Adjustable Voltage
− Linear Regulator for FBVDDQ(2.5V)
• 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)
− Reduce External Component Count
The APW7035 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 reference voltage (1.25V) or GPU Voltage
(2.05V) with a synchronous-rectified buck converter.
The linear controller regulates power for Memory
Voltage.
The precision reference and voltage-mode PWM
control provide ±1% static regulation. The linear con-
troller drives an external N-channel MOSFET to pro-
vide adjustable voltage.
The APW7035 monitors all the output voltages , and
a single Power Good signal is issued when the PWM
Voltage is within ±10% of the DAC setting and the
Linear regulator output levels are above their under-
voltage thresholds. Additional built-in over-voltage pro-
tection 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_DS(ON) , eliminating the need for a
current sensing resistor.
Applications
• Motherboard Power Regulation for Computers
• Low-Voltage Distributed Power Supplies
• VGA Card Power Regulation
• Termination Voltage
The APW7035A/B/C/D support a TTL 3-input Digital
to Analog converter that adjusts the synchronous-
rectified buck converter output from 1.00V to 3.20V
, reference to Table1.
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. A.4 - Jul., 2001
www.anpec.com.tw