APW7035 データシートの表示（PDF） - Anpec Electronics

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APW7035

Advanced PWM and Linear Power Control

Anpec Electronics 

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 RDS(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

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