HIP6021
Data Sheet
February 1999
File Number
4684
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
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. The AGP bus power linear controller’s
output (V
OUT2
) is user-selectable, through a TTL-compatible
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±3% (V
OUT3
) and 1.8V±3% (V
OUT4
), 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.
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
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
(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 . . . . . . . . . . . . . . . . . . . 1.3V
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 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
Pinout
HIP6021 (SOIC)
TOP VIEW
DRIVE2 1
FIX 2
28 VCC
27 UGATE
26 PHASE
25 LGATE
24 PGND
23 OCSET
22 VSEN1
21 FB
20 COMP
19 VSEN3
18 DRIVE3
17 GND
16 VAUX
15 DRIVE4
Ordering Information
PART NUMBER
HIP6021CB
HIP6021EVAL1
TEMP.
RANGE (
o
C)
0 to 70
PACKAGE
28 Ld SOIC
PKG.
NO.
M28.3
VID4 3
VID3 4
VID2 5
VID1 6
Evaluation Board
VID0 7
PGOOD 8
Applications
• Motherboard Power Regulation for Computers
SD 9
VSEN2 10
SELECT 11
SS 12
FAULT/RT 13
VSEN4 14
2-296
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright
©
Intersil Corporation 1999
INTERSIL [ INTERSIL CORPORATION ]
