HIP6521
TM
Data Sheet
August 2000
File Number
4837.1
PWM and Triple Linear Power Controller
The HIP6521 provides the power control and protection for
four output voltages in high-performance microprocessor
and computer applications. The IC integrates a voltage-
mode PWM controller and three linear controllers, as well as
monitoring and protection functions into a 16-lead SOIC
package. The PWM controller is intended to regulate the
microprocessor memory core voltage with a synchronous-
rectified buck converter. The linear controllers are intended
to regulate the computer system’s AGP 1.5V bus power, the
2.5V clock power, and the 1.8V power for the North/South
Bridge core voltage and/or cache memory circuits. Both the
switching regulator and linear voltage references provide
±2%
of static regulation over line, load, and temperature
ranges. All outputs are user-adjustable by means of an
external resistor divider. All linear controllers employ bipolar
NPNs for the pass transistors.
The HIP6521 monitors all the output voltages. The PWM
controller’s adjustable overcurrent function monitors the
output current by using the voltage drop across the upper
MOSFET’s r
DS(ON)
. The linear regulator outputs are
monitored via the FB pins for undervoltage events.
Features
• Provides 4 Regulated Voltages
- Memory Core, AGP, Clock, and Memory Controller Hub
Power
• ACPI Compatible
• Drives Bipolar Linear Pass Transistors
• Externally Resistor-Adjustable 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
- All Outputs:
±2%
Over Temperature
• Overcurrent Fault Monitors
- Switching Regulator Does Not Require Extra Current
Sensing Element, Uses MOSFET’s r
DS(ON)
• Small Converter Size
- 300kHz Constant Frequency Operation
- Small External Component Count
Ordering Information
PART NUMBER TEMP. RANGE (
o
C)
HIP6521CB
HIP6521EVAL1
0 to 70
Evaluation Board
PACKAGE
16 Ld SOIC
PKG.
NO.
M16.15
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Pinout
Applications
• Motherboard Power Regulation for Computers
DRIVE2 1
FB2 2
FB 3
COMP 4
GND 5
PHASE 6
BOOT 7
UGATE 8
HIP6521 (SOIC)
TOP VIEW
16 FB3
15 DRIVE3
14 FB4
13 DRIVE4
12 OCSET
11 VCC
10 LGATE
9 PGND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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