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APW6020

Advanced Dual PWM and Dual Linear Power Controllers

Anpec Electronics 

APW6020

Advanced Dual PWM and Dual Linear Power Controllers

Features

General Description

• 4 Regulated Voltages are provided

− Microprocessor Core (1.3V to 3.5V)

− AGP Bus (1.5V or 3.3V)

− Memory (1.8V) , GTL Bus (1.5V)

• Simple Single-Loop Control Designs

Voltage-Mode PWM Control

• Fast PWM Converter Transient Response

High-Bandwidth Error Amplifiers

− Full 0% to 100% Duty Ratios

• Excellent Output Voltage Regulation

− Core PWM Output : ± 1% Over Temperature

− Other Outputs : ± 3% Over Temperature

• TTL-Compatible 5- Bit DAC Microprocessor

Core Output Voltage Selection

−

Wide

Range

-

1.3V

DC

to

3.5

V

DC

• Power-Good Output Voltage Monitor

• Over-Voltage and Over-Current Fault Monitors

• Small Converter Size

− Constant Frequency Operation

− 200kHz Free-Running Oscillator ; Program-

mable From 50kHz to Over 800kHz

− Small External Component Count

Applications

The APW6020 provides the power control and pro-

tection for four output voltages in high-performance ,

graphics intensive microprocessor and computer

applications. The IC integrates two voltage-mode

PWM controllers and two linear controllers , as well

as the monitoring and protection functions into a single

package. One PWM controller regulates the micro-

processor core voltage with a synchronous-rectified

buck converter. The second PWM controller sup-

plies the computer’s AGP 1.5V or 3.3V bus power

with a standard Buck converter. The linear control-

lers requlate the power for the 1.5V GTL bus , and

the 1.8V power for the North/South Bridge core volt-

age and/or cache memory circuits. The APW6020

includes an Intel-compatible , TTL 5-input digital-to-

analog converter (DAC) that adjusts the core PWM

output voltage from 1.3 VDC to 2.05 VDC in 0.05V steps

and from 2.1 V to 3.5 V in 0.1V increments. The

DC

DC

precision reference and voltage-mode control provide

±1% static regulation. The second PWM controller’s

output is user-selectable , through a TTL-compatible

signal applied at the SELECT pin , for levels of 1.5V

or 3.3V with ±3% accuracy. The two linear regula-

tors provide fixed output

) and 1.8V±3% (VOUT4 ).

voltages

of

1.5V±

3%

(VOUT3

The APW6020 monitors all the output voltages. A

single Power Good signal is issued when the core is

within ±10% of the DAC setting and all other outputs

are above their under-voltage levels. Additional built-

in over-voltage protection for the core output uses

the lower MOSFET to prevent output voltages above

115% of the DAC setting. The PWM controller’s over-

current function monitors the output current by using

the voltage drop across the upper MOSFET’s r .

DS(ON)

• Motherboard Power Regulation for Computers

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.2 - May, 2001

www.anpec.com.tw

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