APW6020 Datasheet, PDF (1/13 Pages) Anpec Electronics Coropration – Advanced Dual PWM and Dual Linear Power Controllers

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 V_DC to 2.05 V_DC 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% (V_OUT4 ).
voltages
of
1.5V±
3%
(V_OUT3
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