Datasheet

ISL97686
4-Channel LED Driver with Independent Channel Control for Dynamic Dimming

Overview
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Typical Diagram

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Key Features

4 x 160mA, 75V Rated Channels with Integrated Channel Regulation FETs
Channels can be Ganged for High Current

2 x 350mA
1 x 700mA

9V~32V Input Voltage
Dimming Modes:

Independent Channel Dimming Control with SPI
PWM Dimming with Adjustable Output Frequency
10-bit Dimming Resolution
VSYNC Mode

2 Selectable Current Levels for 3D Applications
Current Matching of ±1%
Integrated Fault Protection Features such as String Open Circuit Protection, String Short Circuit Protection, Overvoltage Protection, and Over-Temperature Protection
28 Ld 5x5mm TQFN and 28 Ld 300mil SOIC Packages Available

Description

The ISL97686 is a PWM controlled LED driver that supports 4 channels of LED current, for Monitor and TV LCD backlight applications. It is capable of driving 160mA per channel from a 9V to 32V input supply, with current sources rated up to 75V absolute maximum.

The ISL97686’s current sources achieve typical current matching to ±1%, while dynamically maintaining the minimum required VOUT necessary for regulation. This adaptive scheme compensates for the non-uniformity of forward voltage variance in the LED strings.

The ISL97686 dimming can be controlled by a high speed SPI interface for independent channel control for dynamic dimming function synthesized on chip at 10-bit resolution.

The ISL97686 has an advanced dynamic headroom control function, which monitors the highest LED forward voltage string, and regulates the output to the correct level to minimize power loss. This proprietary regulation scheme also allows for extremely linear PWM dimming from 0.02% to 100%. The LED current can also be switched between two current levels, giving support for 3D applications. The ISL97686 incorporates extensive protections of string open and short circuit detections, OVP, and OTP.