6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control

Not Recommended for New Designs.
Recommended Replacement Parts ISL97671A, ISL97672B.

Typical Diagram

enlarge +typical diagram

Key Features

    • 6 Channels
    • 4.5V to 26.5V Input
    • 45V Output Max
    • Up to 40mA LED Current per Channel
    • Extensive Dimming Control
      • PWM/DPST Dimming, I2C 8-bit with Equal Phase Shift, and 0.007% Direct PWM Dimming at 200Hz
    • Optional Master Fault Protection
    • PWM Dimming Linearity 0.4%~100% <30kHz
    • 600kHz/1.2MHz Selectable Switching Frequency
    • Dynamic Headroom Control
    • Protections with Flag Indication
      • String Open/Short Circuit, VOUT Short Circuit, Overvoltage and Over-Temperature Protections
      • Optional Master Fault Protection
    • Current Matching ±0.7%
    • 20 Ld 4mmx3mm QFN Package


The ISL97671 is a 6-Channel 45V dual dimming capable LED driver that can be used with either SMBus/I2C or PWM signal for dimming control. The ISL97671 drives 6 channels of LED to support 78 LEDs from 4.5V to 26V or 48 LEDs from a boost supply of 2.7V to 26V and a separate 5V bias on the ISL97671 VIN pin.

The ISL97671 compensates for non-uniformity of the forward voltage drops in the LED strings with its 6 voltage controlled-current source channels. Its headroom control monitors the highest LED forward voltage string for output regulation, to minimize the voltage headroom and power loss in a typical multi-string operation.

The ISL97671 features optional channel phase shift control to minimize the input, output ripple characteristics and load transients as well as spreading the light output to help reduce the video and audio interference from the backlight driver operation. The phase shift can be programmed with equal phase angle or adjustable in 7-bit resolution.

The ISL97671 has a full range of dimming capabilities that include SMBus/I2C controlled PWM dimming or DC dimming. It can also do direct PWM dimming with as low as 350ns pulse on PWM pin, which translates to a duty-cycle of 0.007% at a 200Hz dimming frequency.


    • Notebook Displays WLED or RGB LED Backlighting
    • LCD Monitor LED Backlighting
    • Automotive Displays LED Backlighting
    • Automotive or Traffic Lighting
    • Embedded Processor and I/O Supplies


Design Tip

I see many manufacturers offer "+/-15kV ESD Protected" (or "High ESD") products. Does this mean that they all have the same level of protection?

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I am looking for differential to single-ended video conversion solution for NTSC differential video input to drive a single-ended monitor.

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Is there somewhere I can find out what simulations and models (e.g. Spice, PSpice, IBIS) are available on your website?

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