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APW6021

Advanced PWM and Triple Linear Power Controllers

Anpec Electronics 

APW6021

Advanced PWM and Triple Linear Power Controllers

Functional

Applications

• 4 Regulated Voltages are provided

• Motherboard Power Regulation for Computers

• Microprocessor Core (1.3V to 3.5V)

• AGP Bus (1.5V or 3.3V)

• Memory (1.8V)

• GTL Bus (1.5V)

• Linear Controllers Drives with both MOSFET

and Bipolar Series Pass Transistors

• Fixed or Externally Resistor-Adjustable Linear

Outputs (FIX Pin)

• Simple Single-Loop Control Design

• Voltage-Mode PWM Control

• Fast PWM Converter Transient Response

• High-Bandwidth Error Amplifier

• Full 0% to 100% Duty Ratio

• 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 - 1.3VDC to 3.5 VDC

• Power-Good Output Voltage Monitor

• Over-Voltage and Over-Current Fault Monitors

• Switching Regulator Does Not Require

General Description

The APW6021 provides the power control and pro-

tection for four output voltages in high-performance,

graphics intensive microprocessor and computer

applications. The IC integrates voltage-mode PWM

controller and three linear controllers, as well as the

monitoring and protection functions into a 28-pin SOIC

package. The PWM controller regulates the micro-

processor core voltage with a synchronous-rectified

buck converter. The linear controllers regulate the

computer system’s AGP 1.5V or 3.3V bus power, the

1.5V GTL bus power, and the 1.8V power for the

North/South Bridge core voltage and/or cache

memory circuits. The APW6021 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 VDC to

3.5 VDC in 0.1V increments. The precision reference

and voltage-mode control provide ±1% static

regulation. The AGP bus power linear controller’s

output (V ) is user-selectable, through a TTL-com-

OUT2

patible signal applied at the SELECT pin, for levels of

1.5V or 3.3V with ±3% accuracy. Based on the sta-

tus of the FIX pin, the other two linear regulators pro-

vide either fixed output voltages of 1.5V± 3% (VOUT3 )

and 1.8V±3% (VOUT4 ), or user-adjustable by means

of an external resistor divider. All linear controllers

can employ either N-channel MOSFETs or bipolar

NPNs for the pass transistor.

Extra Current Sensing Element, Uses

MOSFET’s r DS(ON)

• Small Converter Size

• Constant Frequency Operation

• 200kHz Free-Running Oscillator; Program-

mable From 50kHz to Over 1MHz

The APW6021 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 rDS(ON) .

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.4 - Mar., 2001

www.anpec.com.tw

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