ISL6440ACB-T

Overview

The ISL6440ACB-T is a dual-output, 300kHz step-down PWM controller manufactured by Intersil. It operates with a wide input supply voltage range of 5.6V to 24V and features two independently programmable output voltages adjustable down to 0.8V. The device utilizes current mode control for excellent dynamic response and synchronizes its two PWM outputs 180 degrees out of phase to reduce RMS input current and ripple voltage. It includes extensive circuit protection functions such as overcurrent, overtemperature, UVLO, and independent shutdown capabilities.

Feature Summary

• Dual-output architecture with 180-degree out-of-phase operation to minimize input ripple
• Current mode control with voltage feed-forward for rapid transient response
• Integrated protection against overcurrent, overtemperature, and undervoltage lockout

Applications

• Power supplies with two outputs
• xDSL modems and routers
• DSP, ASIC, and FPGA power supplies
• Set-top boxes
• Telecom systems

Procurement Notes

Verify the specific suffix 'CB' against official datasheets to confirm package type and temperature grade. Confirm RoHS compliance status and lead-free annealing details. Check for obsolescence or lifecycle status changes from Intersil or Renesas. Ensure the component matches the required input voltage range and switching frequency specifications for your design.

Selection Notes

Select this controller for applications requiring two isolated or non-isolated low-voltage outputs from a higher intermediate bus voltage. It is suitable where space savings from reduced input capacitance are critical due to the interleaved phase operation. Consider the 300kHz switching frequency for balancing efficiency and component size. Verify that the external MOSFETs support the required current levels and rDS(ON) characteristics for the internal current sensing method.

Part Context

The ISL6440 series belongs to Intersil's portfolio of high-performance DC/DC controllers designed for embedded systems. It addresses the need for efficient power conversion in telecom and computing infrastructure. The device simplifies design by integrating control logic, protection, and soft-start functions into a single IC, reducing the bill of materials compared to discrete solutions.

Replacement Considerations

Check for direct pin-compatible replacements within the ISL6440 family, such as the ISL6440A, ensuring functional equivalence in voltage ranges and protection features. Verify compatibility with existing PCB layouts and external component values when substituting.