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ISL97678IRZ-TK

8-Channel 45V 50mA LED Driver

Intersil 

8-Channel 45V 50mA LED Driver

ISL97678

The ISL97678 is an 8-channel PWM dimming LED driver

for LCD backlight applications. The ISL97678 is capable

of driving up to 96 pieces of 3.4V/50mA LEDs but larger

numbers of LEDs is possible if the LED forward voltage

combined is less than 45V. The ISL97678 has 8 channels

of voltage controlled current sources with typical currents

matching to ±1%, which compensate for the

non-uniformity effect of forward voltages variance in the

LED strings. To minimize the voltage headroom and

power loss in the typical multi-string operation, the

ISL97678 features dynamic headroom control that

monitors the highest LED forward voltage string and uses

its feedback signal for output regulation.

The ISL97678 features PWM dimming up to 30kHz with

0.8%~100% duty cycle and maintains ±1% current

matching across all ranges. The PWM dimming frequency

can be adjusted between 100Hz and 30kHz. The boost

switching frequency can also be adjusted between

600kHz and 1.5MHz.

The ISL97678 features extensive protection functions

that include string open and short circuit detections, OVP,

and OTP.

ISL97678 is available in the 32 Leads QFN 5mmx5mm

and operate from -40°C to +85°C with input voltage

ranges from 4.75V to 26V.

Features

• 8 Channels

• 4.75V ~ 26V Input

• 45V Maximum Output

• Drive Typically 96 LEDs (3.4V/50mA each)

• External PWM Input up to 25kHz Dimming

• Dimming range 0.8%~100% up to 30kHz

• Current Matching ±0.7%

• Protections

- String Open Circuit and Short Circuit Detections,

OVP, and OTP

• Adjustable Dimming Frequency

• Adjustable Switching Frequency

• 32 Ld (5mmx5mm) QFN Package

Applications

• Notebook Displays WLED or RGB LED Backlighting

• LCD Monitor LED Backlighting

November 5, 2009

FN6998.1

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright Intersil Americas Inc. 2009. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

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