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ISL6433CB Datasheet

  • ISL6433CB

  • Analog IC

  • 693.00KB

  • 15頁(yè)

  • ETC

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ISL6433
TM
Data Sheet
August 2001
File Number
9020
Advanced PWM and Dual Linear Power
Controller for Gateway Applications
The ISL6433 provides the power control and protection for
three output voltages used by high-performance
microprocessors in gateway 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
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 ISL6433 includes an Intel廬 -compatible, TTL 5-input
digital-to-analog converter (DAC) that adjusts the core PWM
output voltage from 2.1VDC to 3.5VDC in 0.1V increments
and from 1.3VDC to 2.05VDC in 0.05V steps. The precision
reference and voltage-mode control provide
鹵1%
static
regulation. The linear regulator uses an internal pass device
to provide 2.5V
鹵2.5%.
The linear controller drives an
external N-channel MOSFET to provide 1.5V
鹵2.5%.
The ISL6433 monitors all the output voltages. A single
Power Good signal is issued when the core is within 鹵10% of
the DAC setting and the other levels are above their under-
voltage levels. Additional built-in overvoltage protection for
the core output uses the lower MOSFET to prevent output
voltages above 115% of the DAC setting. The PWM
overcurrent function monitors the output current by using the
voltage drop across the upper MOSFET鈥檚 r
DS(ON)
,
eliminating the need for a current sensing resistor.
Features
鈥?Provides 3 Regulated Voltages
- Microprocessor Core, Clock and GTL Power
鈥?Drives N-Channel MOSFETs
鈥?Operates from +3.3V, +5V and +12V Inputs
鈥?Simple Single-Loop PWM Control Design
- Voltage-Mode Control
鈥?Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratios
鈥?Excellent Output Voltage Regulation
- Core PWM Output:
鹵1%
Over Temperature
- Other Outputs:
鹵2.5%
Over Temperature
鈥?TTL-Compatible 5-Bit Digital-to-Analog Core Output
Voltage Selection
- Wide Range . . . . . . . . . . . . . . . . . . . 1.3V
DC
to 3.5V
DC
- 0.1V Steps . . . . . . . . . . . . . . . . . . . . 2.1V
DC
to 3.5V
DC
- 0.05V Steps . . . . . . . . . . . . . . . . . . 1.3V
DC
to 2.05V
DC
鈥?Power-Good Output Voltage Monitor
鈥?Microprocessor Core Voltage Protection Against Shorted
MOSFET
鈥?Overvoltage and Overcurrent Fault Monitors
- Does Not Require Extra Current Sensing Element,
Uses MOSFET鈥檚 r
DS(ON)
鈥?Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator; Programmable from
50kHz to over 1MHz
Pinout
ISL6433
(SOIC)
TOP VIEW
Applications
鈥?Power Regulation for Gateway Processors
24 UGATE1
23 PHASE1
22 LGATE1
21 PGND
20 OCSET1
19 VSEN1
18 FB1
17 COMP1
16 FB3
15 DRIVE3
14 GND
13 VOUT2
VCC 1
VID4 2
VID3 3
VID2 4
VID1 5
VID0 6
PGOOD 7
FAULT 8
SS 9
RT 10
FB2 11
VIN2 12
鈥?Low-Voltage Distributed Power Supplies
Ordering Information
PART NUMBER
ISL6433CB
TEMP.
RANGE (
o
C)
0 to 70
PACKAGE
24 Ld SOIC
PKG.
NO.
M24.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil and Design is a trademark of Intersil Americas Inc.
Intel廬 is a registered trademark of Intel Corporation.
|
Copyright 漏 Intersil Americas Inc. 2001, All Rights Reserved

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