ISL9441IRZ-T

Overview

The ISL9441IRZ-T is a quad-output power management IC featuring three synchronous buck controllers and one low-dropout linear regulator controller. It operates within an input voltage range of 4.5V to 24V with a fixed switching frequency of 300kHz. The device utilizes current mode control with feed forward and internal loop compensation, requiring minimal external components. Outputs are adjustable down to 0.8V, and the PWM channels are synchronized at 180° out of phase to reduce RMS input current and ripple voltage.

Feature Summary

• Integrates three synchronous buck controllers and one LDO controller for multi-rail power generation.
• Features independent enable inputs to facilitate supply rail sequencing.
• Includes integrated UV/OV/OC/OT protections for system reliability.
• Utilizes internal loop compensation to minimize peripheral component count.

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels due to end-of-life status. Confirm package integrity and pin alignment against the 32-QFN specification. Review datasheet revisions for any design-in changes. Ensure storage conditions meet moisture sensitivity level requirements prior to assembly.

Selection Notes

Select this component when a compact solution for multi-rail power is required in home connectivity devices. The fixed 300kHz frequency and internal compensation simplify design compared to programmable alternatives. Consider the absence of early warning features if input voltage monitoring is critical for the application.

Part Context

Manufactured by Renesas Electronics Corporation (formerly Intersil), this part belongs to the ISL944x family of quad-output synchronous buck controllers. It shares architectural similarities with the ISL9440 and ISL9440A but lacks the early warning function present in those variants.

Replacement Considerations

ISL9440AIRZ-T is documented as a parameter-equivalent substitute.