ISL9440AIRZ

Overview

The ISL9440AIRZ-T is a quad-output power management IC featuring three synchronous buck controllers and one low-dropout linear regulator controller. It operates within a supply voltage range of 4.5V to 24V with a fixed switching frequency of 600kHz. The device utilizes internal loop compensation and current mode control with feed-forward to minimize external components. It supports independent enable inputs for supply rail sequencing and includes integrated UV, OV, OC, and OT protections.

Feature Summary

• Integrates three PWM controllers and one LDO controller for multi-rail power generation
• Features internal soft-start and independent enable inputs for supply rail sequencing
• Includes integrated UV/OV/OC/OT protection mechanisms
• Offers an early warning function to signal data backup during input voltage drops

Applications

• Cable and satellite set-top boxes
• VoIP gateways
• Cable modems
• Home connectivity products
• Industrial and general purpose applications

Procurement Notes

Verify the specific suffix (e.g., -T) against the datasheet to confirm packaging type, as standard variants may differ. Confirm component status, as discontinuation notices indicate potential end-of-life constraints. Ensure compatibility with existing PCB footprints and thermal requirements before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring four distinct power rails from a single controller. The 600kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Verify that the application benefits from the integrated early warning feature for critical data preservation during power anomalies.

Part Context

This part belongs to the ISL9440 family, which also includes variants like the ISL9440BIRZ and ISL9441. While sharing similar topologies, differences exist in switching frequencies and features such as the early warning function. The ISL9440AIRZ-T specifically denotes the 600kHz variant with early warning capabilities in tape-and-reel packaging.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.