The ISL97682, ISL97683, ISL97684 are Intersil’s highly

integrated 2-3-4-channels LED drivers that are suitable for

medium size TFT-LCD backlights. These parts can drive multiple

channels of LEDs from inputs as low as 4V to outputs of up to

45V. They can also operate from inputs as low as 3V to outputs of

up to 26.5V in bootstrap configuration (see Figure 26 for 3V

operation).

The ISL97682, ISL97683, ISL97684 feature optional channels

phase shift control. This feature is used to minimize the input,

output ripple characteristics and load transient, which help

eliminate or reduce the video and audio noise interference from

the backlight driver operation.

The ISL97682, ISL97683, ISL97684 offer 8-bit PWM dimming for

systems that need frequency tuning flexibility. With the unique

adaptive boost switching architecture, the ISL97682, ISL97683,

ISL97684 also offer Direct PWM dimming with output, which

follows input and achieves linearity as low as 0.009 at 200Hz

or 1.35 at 30kHz.

The drivers incorporate dynamic headroom control that monitors

the highest LED forward voltage string and uses its feedback signal

for the minimum output regulation. The ISL97682, ISL97683,

ISL97684 incorporates extensive fault protection functions including

string open and short circuit detections, OVP, and OTP. The switching

frequency can be selected at either 600kHz or 1.0MHz in PFM or

PWM mode. These parts are available in the thin and compact

16 Ld 3mmx3mm TQFN package and operate in ambient

temperature from -40°C to +85°C.

Features

• ISL97682 - 2 x 100mA Channels

• ISL97683 - 3 x 50mA Channels

• ISL97684 - 4 x 50mA Channels

• Input Voltage 4.0V~26.5V with Max VOUT of 45V

• Input Voltage 3.0V (see Figure 26)~24V with Max VOUT of 26.5V

• PWM Dimming Linearity

- PWM Dimming with Adjustable Dimming Frequency with

Duty Cycle Linear from 0.4 to 100 <30kHz

- Direct PWM Dimming with Duty Cycle Linear from 0.009

to 100 at 200Hz

• Current Matching of 0.7 typical from 1~100 Dimming

• Selectable 600kHz or 1MHz Switching Frequency in PWM/PFM

Mode

• Dynamic Headroom Control

• Fault Protection

- String Open/Short Circuit Protections, OVP, OTP

• Thin and Compact TQFN-16 3mmx3mm Package

Applications

• Tablet to Notebook PC Displays LED Backlighting

• PMP LED Backlighting