ISL6446IAZ

Overview

The ISL6446IAZ is a triple output switching controller featuring two synchronous buck PWM controllers and one linear regulator. It operates with synchronized 180-degree out-of-phase PWMs to reduce input ripple. The device supports a switching frequency range of 100 kHz to 2.5 MHz, with a maximum duty cycle of 80%. It regulates outputs down to 0.6V with ±1.5% tolerance. The linear controller provides low-current output. Operating voltage is 4.5V to 5.5V. Output current capability is 50 mA. It functions within a temperature range of -40°C to +85°C in a 24-QSOP package.

Feature Summary

• Integrates dual synchronous buck PWM controllers and one linear regulator for combined power management
• Utilizes 180-degree out-of-phase operation to substantially reduce input voltage ripple and RMS current
• Provides robust protection including adjustable overcurrent sensing via upper MOSFET rDS(ON) and thermal shutdown at +150°C

Applications

• ATX power supplies
• DSP, ASIC, and FPGA point of load regulation
• Industrial and security networking applications

Procurement Notes

This component is officially discontinued and no longer manufactured by Renesas Electronics Corporation. Availability is restricted or limited. Verification of end-of-life status is required before integration into new designs. Engineers must confirm the finality of the discontinuation notice and assess supply chain risks associated with legacy inventory sources.

Selection Notes

Select this controller for applications requiring simultaneous high-frequency DC/DC conversion and low-noise linear regulation. It is suitable for broadband, DSL, and networking systems needing compact solutions. Consider the 24-QSOP package constraints and the specific requirement for 180-degree phase shifting to manage input currents effectively in dense power architectures.

Part Context

Part of the ISL6446 series from Renesas (formerly Intersil), designed for high-performance power management. It serves as a specialized PMIC solution for multi-rail systems. The device combines voltage mode control for PWM sections with precise linear regulation, targeting efficiency and size optimization in professional computing and communication infrastructure equipment.

Replacement Considerations

ISL6442IAZ and ISL6446AIAZ are documented as parameter-equivalent alternatives.