ISL9440CIRZ

Overview

The ISL9440CIRZ is a quad-output power management integrated circuit manufactured by Renesas Electronics Corporation. It integrates three synchronous buck controllers and one low-dropout linear regulator controller within a single 32-QFN package measuring 5mm x 5mm. The device operates with an input voltage range of 4.5V to 24V and supports a switching frequency of 600kHz for the PWM channels. It provides four independent output rails, each adjustable down to 0.8V, designed to supply multi-rail power requirements for complex electronic systems.

Feature Summary

• Integrates three PWM synchronous buck controllers and one LDO controller in a compact footprint
• Features internal loop compensation to minimize external component count and solution cost
• Includes independent enable inputs to facilitate precise supply rail sequencing
• Provides comprehensive protection against under-voltage, over-voltage, over-current, and over-temperature conditions

Applications

• Cable and satellite set-top boxes
• VoIP gateways
• Cable modems
• Home connectivity products
• Industrial control systems

Procurement Notes

Verify the specific suffix 'C' against official Renesas documentation to confirm temperature grade and feature set alignment. Check current product status as components may be subject to end-of-life notices or manufacturing changes. Ensure the 32-QFN package dimensions match the target PCB layout constraints before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring multiple regulated voltage rails from a single intermediate bus voltage. The integrated nature of the device reduces board space compared to discrete solutions. Consider the 600kHz switching frequency for balancing efficiency and passive component size. Verify that the thermal performance of the QFN package meets the application's heat dissipation requirements.

Part Context

This part belongs to the ISL9440 family of quad-output power management ICs. Variants such as the ISL9440 and ISL9441 differ primarily in switching frequency and early warning functionality. The ISL9440CIRZ represents a specific configuration within this series, tailored for applications needing synchronized buck regulation alongside an LDO output in a space-constrained environment.

Replacement Considerations

Consult official cross-reference data for direct replacements. Evaluate pin-to-pin compatible alternatives if the ISL9440CIRZ is unavailable. Ensure any substitute maintains the same output topology (3 buck + 1 LDO) and operating voltage range.