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

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

Applications

? Monitor/TV LED Backlighting

? General/Industrial/Automotive Lighting