ISL6432
PWM and Triple Linear Power Controller for Home Gateway Applications
Key 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 rDS(ON)
- Small Converter Size
- 300kHz Constant Frequency Operation
- Small External Component Count
- ACPI Compatible
- Voltage Sequencing
Description
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 synchronousrectified 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 useradjustable 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 rDS(ON). The linear regulator outputs are monitored via the FB pins for undervoltage events.
Applications
- Low-Power Distributed DC-DC Conversion
- Cable Modem and DSL Modem Power Regulation
- High Performance Memory Applications
