ISL6432 Datasheet, PDF (1/12 Pages) Intersil Corporation – PWM and Triple Linear Power Controller for Home Gateway Applications

TM
Data Sheet
ISL6432
June 2001
File Number 9019
PWM and Triple Linear Power Controller
for Home Gateway Applications
The ISL6432 provides the power control and protection for
four output voltages for use with high-performance
microprocessor and embedded controller based
communications chip sets. 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 can be
configured to generate DSP power, as well as upstream and
downstream voltages. 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 ISL6432 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.
Ordering Information
PART NUMBER TEMP. RANGE (^oC) PACKAGE
PKG.
NO.
ISL6432CB
0 to 70
16 Ld SOIC M16.15
ISL6432EVAL1 Evaluation Board
Applications
• _{Low-Power Distributed DC-DC Conversion}
• _{Cable Modem and DSL Modem Power Regulation}
• High Performance Memory Applications
Features
• Provides 4 Regulated Voltages
- Memory Core, Embedded Controller/DSP, Tuner
• 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
• ACPI Compatible
• Voltage Sequencing
Pinout
ISL6432 (SOIC)
TOP VIEW
DRIVE2 1
FB2 2
FB 3
COMP 4
GND 5
PHASE 6
BOOT 7
UGATE 8
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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