1
File Number
4793
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright
Intersil Corporation 1999
HIP6021A
Advanced PWM and Triple Linear Power
Controller
The HIP6021A 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 lead SOIC package.
The synchronous-rectified buck converter includes an Intel-
compatible, TTL 5-input digital-to-analog converter (DAC)
that adjusts the core PWM output voltage from 1.3V
DC
to
2.05V
DC
in 0.05V steps and from 2.1V
DC
to 3.5V
DC
in 0.1V
increments. The precision reference and voltage-mode
control provide
±
1% static regulation. A TTL-compatible
signal applied to the SELECT pin dictates which method of
control is used for the AGP bus power: a low state results in
linear control of the AGP bus to 1.5V, while a high state
transitions the output through a linearly controlled softstart to
3.3V, followed by full enhancement of the external MOSFET
to pass the input voltage. The other two linear regulators
provide fixed output voltages of 1.5V GTL bus power and
1.8V power for the North/South Bridge core and/or cache
memory. These levels are user-adjustable by means of an
external resistor divider and pulling the FIX pin low. All linear
controllers can employ either N-Channel MOSFETs or
bipolar NPNs for the pass transistor.
The HIP6021A 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)
.
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
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 Core Output Voltage Selection
- Shutdown Feature Removed When All Inputs High
- Wide Range 1.3V
DC
to 3.5V
DC
Power-Good Output Voltage Monitor
Over-Voltage and Over-Current Fault Monitors
- Switching Regulator Does Not Require Extra Current
Sensing Element, Uses Upper MOSFET’s r
DS(ON)
Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator; Programmable From
50kHz to Over 1MHz
- Small External Component Count
Applications
Motherboard Power Regulation for Computers
Pinout
HIP6021A (SOIC)
TOP VIEW
Ordering Information
PART NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
HIP6021ACB
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
PGOOD
VID2
SD
VSEN1
VSEN3
VID1
VID0
OCSET
FB
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
Data Sheet
November 1999