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HIP6021

Advanced PWM and Triple Linear Power

Controller

The HIP6021 provides the power control and protection for

four output voltages in high-performance, graphics intensive

microprocessor and computer applications. The IC

integrates a 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 microprocessor 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 HIP6021 includes an Intel-compatible, TTL

5-input digital-to-analog converter (DAC) that adjusts the

precision reference and voltage-mode control provide

±1%

static regulation. The AGP bus power linear controller’s

signal applied at the SELECT pin, for levels of 1.5V or 3.3V

with

±3% accuracy. Based on the status of the FIX pin, the

other two linear regulators provide either fixed output

voltages of 1.5V

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.

The HIP6021 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

Applications

• Motherboard Power Regulation for Computers

Features

• Provides 4 Regulated Voltages

- Microprocessor Core, AGP Bus, Memory, and GTL Bus

Power

• Drives N-Channel MOSFETs

• Linear Regulator Drives Compatible 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

• Power-Good Output Voltage Monitor

• Over-Voltage and Over-Current Fault Monitors

- Switching Regulator Does Not Require Extra Current

• Small Converter Size

- Constant Frequency Operation

- 200kHz Free-Running Oscillator; Programmable From

50kHz to Over 1MHz

- Small External Component Count

Pinout

HIP6021 (SOIC)

TOP VIEW

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

HIP6021CB

0 to 70

28 Ld SOIC

M28.3

HIP6021EVAL1

Evaluation Board

DRIVE2

FIX

VID4

VID3

VSEN2

SELECT

SS

FAULT/RT

VSEN4

VCC

PGND

LGATE

PHASE

DRIVE3

COMP

GND

VAUX

DRIVE4

UGATE

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

PGOOD

VID2

SD

VSEN1

VSEN3

VID1

VID0

OCSET

FB

Data Sheet

February 1999

File Number

4684

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207