ISL97671AIRZ

Overview

The ISL97671AIRZ-T is a six-channel LED driver IC featuring an integrated boost DC-DC converter. It supports input voltages from 4.5V to 26.5V, delivering up to 45V output, or operates in bootstrap mode with 3V to 21V input for up to 26.5V output. Each channel provides a maximum current of 50mA. The device allows selectable switching frequencies of 600kHz and 1.14MHz. It supports PWM dimming with phase shift control and SMBus/I2C interfaces. The component is housed in a 20-QFN (3x4mm) package.

Feature Summary

• Six independent channels with adjustable phase shift control to minimize input/output ripple and audible noise.
• Integrated dynamic headroom control circuit monitors the highest forward voltage string to optimize efficiency.
• Supports direct PWM dimming with high linearity and adjustable frequency settings.
• Comprehensive fault protection including open/short-circuit detection, overvoltage, and overtemperature safeguards.

Applications

• LCD backlight systems
• LED lighting modules

Procurement Notes

Verify the specific suffix against official documentation, as packaging options such as tape-and-reel or cut tape may vary by distributor. Confirm that the 'A' grade designation aligns with required operating temperature ranges. Ensure the selected variant matches the intended application voltage constraints and interface requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring precise multi-channel LED regulation with minimal electromagnetic interference through phase shifting. Consider the internal switch topology and thermal performance within the QFN package when designing heat dissipation strategies. Verify compatibility with system bus protocols if digital dimming control is required for the design.

Part Context

This part belongs to the ISL97671A series of LED drivers manufactured by Renesas Electronics. It is designed specifically for high-efficiency backlighting solutions where space constraints and thermal management are critical. The series offers configurable outputs and advanced dimming capabilities suitable for modern display technologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer cross-reference tools for potential alternatives.

FAQ

Does the ISL97671AIRZ support both analog and digital dimming?

Yes, the device supports PWM dimming via a dedicated pin and can also be controlled via SMBus/I2C for digital dimming adjustments.

What is the purpose of the phase shift control feature?

Phase shift control minimizes input and output ripple characteristics and reduces load transients, which improves overall efficiency and eliminates audible noise.