APW6020

Features:

• 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 - 1.3VDC to 3.5 VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
• Small Converter Size− Constant Frequency Operation− 200kHz Free-Running Oscillator ; Programmable From 50kHz to Over 800kHz− Small External Component Count


Application

• Motherboard Power Regulation for Computers


Pinout




Specifications

Symbol	Parameter	Rating	Unit
Vcc	Supply Voltage	15	V
VI , VO	Input , Output or I/O Voltage	GND -0.3 V to VCC	V
TA	Operating Ambient Temperature Range	0 to 70	°C
TJ	Junction Temperature Range	0 to 125	°C
TSTG	Storage Temperature Range	-65 to +150	°C
TS	Soldering Temperature	300 ,10 seconds	°C

 


Description

The APW6020 provides the power control and protection 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 microprocessor core voltage with a synchronous-rectified buck converter. The second PWM controller supplies the computer's AGP 1.5V or 3.3V bus power with a standard Buck converter. The linear controllers
requlate the power for the 1.5V GTL bus , and the 1.8V power for the North/South Bridge core voltage and/or cache memory circuits. The APW6020 includes an Intel-compatible , TTL 5-input digital-toanalog 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 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 regulators provide fixed output voltages of 1.5V± 3% (VOUT3) and 1.8V±3% (VOUT4 ). 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 builtin 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 overcurrent function monitors the output current by using the voltage drop across the upper MOSFET's rDS(ON) .