ISL9440BIRZ

Overview

The ISL9440BIRZ is a quad-output synchronous buck controller from the ISL9440B series, manufactured by Renesas Electronics. It integrates three PWM controllers and one low-dropout linear regulator (LDO) controller to provide multi-rail power for various applications. The device operates with a switching frequency of 300 kHz and supports an input voltage range of 4.5V to 24V. It features four outputs, each adjustable down to 0.8V, housed in a 32-lead QFN package measuring 5mm x 5mm. The component is designed for surface mount installation and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates three synchronized PWM controllers and one LDO controller for efficient multi-rail power management
• Includes internal loop compensation to minimize external peripheral components and reduce total solution cost
• Provides independent enable inputs for flexible supply rail sequencing and system control

Applications

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

Procurement Notes

Verify current availability status as discontinuation notices may apply. Confirm package integrity and moisture sensitivity handling requirements prior to assembly. Ensure compatibility with existing design specifications regarding thermal performance and electrical parameters before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring integrated multi-rail power solutions with minimal external component count. Consider its 300 kHz switching frequency and 5mm x 5mm footprint for space-constrained designs. Evaluate its suitability for applications needing synchronized phase shifting to reduce input ripple and RMS current demands.

Part Context

The ISL9440BIRZ belongs to the ISL9440 family of mixed-signal power management ICs. This series is engineered to deliver compact, high-efficiency power conversion for consumer electronics and industrial equipment. The B-series variant specifically utilizes a 300 kHz switching frequency, distinguishing it from other variants in the lineup that may offer different frequencies or additional features like early warning signals.

Replacement Considerations

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