ISL6446IAZ-T

Overview

The ISL6446IAZ-T is a triple-output power management controller featuring two synchronous buck PWM controllers and one linear regulator. It operates with synchronized 180-degree out-of-phase switching to minimize input ripple, supporting frequencies from 100 kHz to 2.5 MHz. The device regulates outputs as low as 0.6V with ±1.5% tolerance. It includes soft-start, independent enable functions, adjustable overcurrent protection via MOSFET RDS(ON) sensing, thermal shutdown at +150°C, and PGOOD signaling for status monitoring.

Feature Summary

• Integrates dual synchronous buck PWM controllers and a single linear regulator in one package
• Synchronized 180-degree out-of-phase operation reduces input voltage ripple and RMS current
• Provides robust protection including latch-off overcurrent detection and thermal shutdown
• Features programmable switching frequency and precise output voltage regulation

Applications

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

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging if required by assembly equipment. Confirm the component status, as the base ISL6446 series has been discontinued; ensure availability through authorized channels or qualified substitutes. Validate RoHS compliance and moisture sensitivity level (MSL 3) against storage and reflow profile requirements before procurement.

Selection Notes

Select this controller for designs requiring compact power solutions with reduced input filtering needs due to phase-shifted operation. Suitable for applications needing both high-current DC/DC conversion and a low-current LDO output. Ensure the external MOSFETs support the selected switching frequency and current levels. Verify that the control loop compensation meets stability requirements for the chosen output voltages.

Part Context

The ISL6446 belongs to the ISL6446 family of high-performance triple-output controllers designed primarily for broadband, DSL, and networking applications. It consolidates control, monitoring, and protection functions into a single chip, simplifying board layout and reducing component count compared to discrete solutions.

Replacement Considerations

ISL6442IAZ and ISL6446AIAZ are listed as parameter-equivalent alternatives. Verify pin compatibility and functional equivalence with the datasheet before substitution.