ISL97671AIRZ-TK

Overview

The ISL97671AIRZ-TK is a six-channel LED driver IC manufactured by Renesas Electronics Corporation, designed for backlight applications. It operates as a DC-DC boost converter with an internal switch, supporting input voltages from 4.5V to 26.5V and delivering up to 45V output. Each channel provides a maximum current of 50mA. The device features selectable switching frequencies of 600kHz or 1.14MHz and supports PWM dimming with phase shift control. It is housed in a compact 20-QFN (3x4mm) package.

Feature Summary

• Supports dual dimming methods including SMBus/I2C controlled PWM or DC dimming, as well as direct PWM dimming.
• Features optional channel phase shift control to minimize input/output ripple and improve efficiency.
• Includes dynamic headroom control circuitry to monitor the highest LED forward voltage string for regulation.
• Integrates comprehensive fault protection mechanisms such as open/short-circuit detection, overvoltage, and overtemperature protection.

Applications

• Backlight systems for displays
• Multi-string LED driving configurations

Procurement Notes

Verify the specific suffix 'TK' against official Renesas documentation to confirm packaging details, as standard listings often reference 'TR' (Tape & Reel) or 'CT' (Cut Tape). Ensure the component matches the required RoHS3 compliance and MSL level 3 specifications for your assembly process. Cross-reference the datasheet revision date to confirm technical parameters remain unchanged.

Selection Notes

Select this component when designing multi-channel LED backlight circuits requiring precise current matching and low ripple characteristics. The integrated boost topology and phase shift capability make it suitable for applications demanding high efficiency and audible noise elimination. Consider the 20-QFN package constraints for thermal management and PCB layout requirements.

Part Context

This part belongs to the ISL97671A series of LED drivers from Renesas. It is distinct from similar models like the ISL97672A, which may have different operating conditions or pinouts. The 'AIRZ' designation indicates automotive-grade qualification and a specific package type, while the suffix denotes the specific shipping configuration.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult Renesas engineering support for qualified alternatives if this specific package variant is unavailable.

FAQ

What is the minimum dimming duty cycle for direct PWM operation?

The device supports direct PWM dimming with a minimum duty cycle of 0.007% at 200Hz.

How does the device handle input ripple?

It features optional channel phase shift control to minimize input/output ripple characteristics and load transients.