ISL9440AIRZ-T

Overview

The ISL9440AIRZ-T is a quad-output power management IC featuring three synchronous buck controllers and one LDO, housed in a 32-QFN (5x5 mm) package. It operates within a 4.5V to 24V supply range and supports a switching frequency of 600kHz. The device provides four adjustable outputs down to 0.8V with integrated UV/OV/OC/OT protections. Designed for compact solutions, it utilizes internal loop compensation and independent enable inputs for rail sequencing.

Feature Summary

• Integrates three PWM controllers and one LDO controller for multi-rail power delivery
• Features internal soft-start and independent enable inputs for supply rail sequencing
• Includes integrated protection mechanisms 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

Procurement Notes

Verify component authenticity through authorized Renesas channels due to end-of-life status. Confirm the specific suffix 'AIRZ-T' matches design requirements for temperature grade and tape-and-reel packaging. Cross-reference datasheet revision history for any recent manufacturing changes or PCN updates prior to finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring three synchronized buck rails and one linear regulator from a single IC. The 600kHz frequency suits applications needing reduced passive component size. Ensure input voltage stays within the 4.5V to 24V limit and verify thermal performance within the -40°C to 85°C operating range for industrial environments.

Part Context

This part belongs to the ISL9440 family, which includes variants like ISL9440A and ISL9441. The AIRZ-T designation indicates an automotive-grade temperature range and tape-and-reel packaging. It shares the core topology with other family members but differs in switching frequency and early warning capabilities compared to the standard ISL9440.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the End-of-Life (EOL) status indicated by PCN data, direct replacements may require redesigning the power stage to accommodate different pinouts or control interfaces.