ISL97678IRZ-TK

Overview

The ISL97678IRZ-TK is an 8-channel PWM dimming LED driver IC designed for LCD backlight applications. It features a 4.75V to 26V input voltage range and supports up to 45V maximum output per channel. The device provides 50mA current per channel with ±0.7% typical current matching. It includes dynamic headroom control, adjustable switching frequency from 600kHz to 1.5MHz, and PWM dimming up to 30kHz. Packaged in a 32-lead QFN (5mmx5mm) operating between -40°C and +85°C.

Feature Summary

• Eight independent channels with voltage-controlled current sources for precise LED regulation
• Dynamic headroom control monitors highest forward voltage string to minimize power loss
• Integrated protection functions including string open/short circuit detection, overvoltage, and overtemperature protection

Applications

• Notebook displays
• WLED backlighting systems
• RGB LED backlighting arrays

Procurement Notes

Verify the suffix TK indicates reel packaging configuration distinct from other variants. Confirm RoHS compliance status and moisture sensitivity level prior to assembly planning. Ensure the specific ordering part number matches the required package type and shipping quantity requirements for production integration.

Selection Notes

Select this component for designs requiring high channel count with tight current matching specifications. The adjustable switching frequency allows optimization for electromagnetic interference constraints. Verify that the total LED forward voltage remains within the 45V limit across all series configurations.

Part Context

This device belongs to the ISL97678 series of LED drivers manufactured by Renesas Electronics Corporation. It serves as a specialized solution for multi-string LED arrays where uniform brightness and efficient power management are critical requirements for display backlighting architectures.

Replacement Considerations

ISL97678IRZ-T is a similar alternative within the same product family.