HIP6028
Data Sheet
May 1998
File Number 4630
Advanced PWM and Dual Linear Power
Control with Integrated ACPI Support
Interface
Features
• Provides 3 Regulated Voltages
- Microprocessor Core, Clock and GTL Power
• Integrated ACPI S3-State Shutdown Support
The HIP6028 provides the power control and protection for
three output voltages in high-performance microprocessor
and computer applications. The IC integrates a PWM
controller, a linear regulator and a linear controller as well as
the monitoring and protection functions into a single
• Drives Low Cost Transistors
- PWM Controller Drives N-MOSFETs
- Linear Controller Compatible with Both MOSFETs and
NPN Bipolar Transistors
• Operates from +3.3V, +5V and +12V Inputs
• Simple Control Design
- Single-Loop Voltage-Mode PWM Control
- Fixed 1.5V GTL Output Voltage
- Fixed 2.5V Clock Output Voltage
• Fast Transient Response
package. The PWM controller regulates the microprocessor
core voltage with a synchronous-rectified buck converter.
The linear controller regulates power for the GTL bus and
the linear regulator provides power for the clock driver circuit.
The HIP6028 includes an Intel-compatible, TTL 5-input
digital-to-analog converter (DAC) that adjusts the core PWM
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
output voltage from 2.1V
to 3.5V
in 0.1V increments
in 0.05V steps. The precision
DC
DC
to 2.05V
DC
and from 1.3V
DC
• Excellent Output Voltage Regulation
- Core PWM Output: ±1% Over Temperature
- Other Outputs: ±2.5% Over Temperature
reference and voltage-mode control provide ±1% static
regulation. The linear regulator uses an internal pass device
to provide a fixed 2.5V ±2.5%. The linear controller drives an
external N-channel MOSFET to provide a fixed 1.5V ±2.5%.
• TTL-compatible 5-Bit Digital-to-Analog Core Output
Voltage Selection
The HIP6028 monitors all the output voltages. A single
Power Good signal is issued when the core is within ±10% of
the DAC setting and the other levels 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 over-
current function monitors the output current by using the
- Wide Range . . . . . . . . . . . . . . . . . . . 1.3V
• Power-Good Output Voltage Monitor
to 3.5V
DC
DC
• Microprocessor Core Voltage Protection Against Shorted
MOSFET
• Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element,
Uses MOSFET’s r
DS(ON)
voltage drop across the upper MOSFET’s r
,
• Small Converter Size
DS(ON)
eliminating the need for a current sensing resistor.
- Constant Frequency Operation; 200kHz Free-Running
Oscillator; Programmable from 50kHz to 1MHz
The HIP6028 offers integrated ACPI S3 shutdown state
support. Through the SD1&3 pin, the microprocessor core
and GTL bus supplies can be shut down when entering
power-saving standby operation mode.
Applications
Full Motherboard Power Regulation for Computers
•
•
Low-Voltage Distributed Power Supplies
Pinout
Ordering Information
HIP6028 (SOIC)
TOP VIEW
TEMP.
RANGE
( C)
24
23
22
21
20
19
18
17
16
15
14
13
VCC
VID4
1
2
3
4
5
6
7
8
9
UGATE
PHASE
LGATE
PGND
OCSET
VSEN1
FB
o
PART NUMBER
HIP6028CB
PACKAGE
24 Ld SOIC
PKG. NO.
0 to 70
M24.3
VID3
VID2
HIP6028EVAL1
Evaluation Board
VID1
VID0
PGOOD
FAULT
SS
COMP
VSEN3
DRIVE3
GND
RT 10
SD1&3 11
VIN2 12
VOUT2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
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