ISL97635AIRZ-T

Overview

The ISL97635AIRZ-T is a digitally controlled LED driver IC designed for LCD backlight applications. It features six output channels with a maximum output voltage of 34.5V and an output current of 35mA per channel. The device operates on a boost DC-DC converter topology with selectable switching frequencies of 600kHz and 1.2MHz. It supports PWM dimming control and functions within a supply voltage range of 6V to 24V. The component is housed in a 24-QFN (4x4) package with a bare pad, suitable for surface mount installation.

Feature Summary

• Integrates dynamic headroom control to monitor the highest LED forward voltage string and regulate output, minimizing voltage headroom and power loss during multi-string operations.
• Provides precise current matching with typical accuracy of ±1% across voltage-controlled current sources to compensate for non-uniformity effects in LED stack forward voltages.
• Supports multiple dimming control methods including SMBus 8-bit PWM and DC current adjustments, external PWM input up to 20kHz, and combined DPST dimming compliance.

Applications

• LCD backlight systems
• Portable display devices
• Consumer electronics requiring regulated LED illumination

Procurement Notes

Verify component authenticity through authorized Renesas distributors or certified partners due to end-of-life status. Confirm RoHS3 compliance and MSL level 3 handling requirements. Review Product Change Notices for packaging label updates and bond wire material revisions prior to integration into production designs.

Selection Notes

Select this model for applications requiring six-channel LED regulation with integrated boost conversion. Ensure design accommodates the 24-VFQFN package dimensions and thermal dissipation needs. Validate that system input voltage remains within the 6V to 24V operating range and that PCB layout supports high-frequency switching noise management.

Part Context

This part belongs to the ISL97635 series of LED drivers manufactured by Renesas Electronics Corporation. It is specifically engineered for digital control of LED currents in display backlights. The series emphasizes efficient power management through dynamic headroom adjustment and flexible dimming interfaces compatible with standard display protocols.

Replacement Considerations

The manufacturer has declared this product obsolete. Consult official Renesas documentation for valid substitute part numbers or recommended alternatives. Do not assume functional equivalence with other models without verifying pinout, electrical parameters, and interface compatibility.