ISL9441IRZ

Overview

The ISL9441IRZ is a quad-output synchronous buck controller manufactured by Renesas Electronics Corporation. It integrates three PWM controllers and one low-dropout linear regulator (LDO) controller to provide multi-rail power. The device operates within a supply voltage range of 4.5V to 24V and features a switching frequency of 300kHz. Outputs are adjustable down to 0.8V. It utilizes internal loop compensation and current mode control with feed forward. The component is housed in a space-conscious 32-QFN package measuring 5mm x 5mm.

Feature Summary

• Integrates three synchronous buck PWM controllers and one LDO controller for multi-rail power generation
• Features internal soft-start and independent enable inputs to facilitate supply rail sequencing
• Includes integrated UV/OV/OC/OT protections for comprehensive system safety
• Utilizes internal loop compensation to minimize peripheral components and reduce total solution cost

Applications

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

Procurement Notes

Verify the obsolete status of this component before design finalization. Confirm availability of the parameter-equivalent substitute, ISL9440AIRZ-T, from authorized distributors. Ensure all procurement activities account for end-of-life constraints and long-term supply chain stability requirements.

Selection Notes

Select this component when a compact four-rail power solution is required for home connectivity or industrial equipment. The internal compensation simplifies design compared to externally compensated alternatives. Consider the lack of an early warning function as a key differentiator against the ISL9440 variant if data backup warnings are necessary.

Part Context

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 feature found in those models. The family is designed for applications requiring efficient, space-saving power management solutions.

Replacement Considerations

The ISL9440AIRZ-T is identified as a parameter-equivalent replacement. Verify functional compatibility regarding the absence of the early warning signal and confirm pin-to-pin equivalence for direct substitution in existing designs.