ISL97678 8-Channel 45V 50mA LED Driver

ISL97678

8-Channel 45V 50mA LED Driver

	Features Description		iSim Design Simulation
	Technical Documentation		Tools And Support
	Pricing / Samples		Related Devices

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	ISL97678IRZ	Details
	ISL97678IRZ-T	Details
	ISL97678IRZ-TK	Details

Datasheet
	ISL97678
	8-Channel 45V 50mA LED Driver

Topologies

Inductor Boost

# of LEDs (max)

# of Channels

Digital Interface

Backlight For LCD Size (inches)

up to 17

Total Current for DC/DC Lighting (mA)

400

I_OUT (max/Channel) (mA)

Peak Efficiency (%)

93.4

V_IN (V)

4.75 to 26

V_OUT (max) (V)

Frequency (MHz)

1.5

I_S (max) (mA)

I_q (max) (μA)

I_sw (typ) (mA)

3800

Integrated Diode

OVP

Fault Switch

Brightness Control

PWM

Product Information

Key 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

Description

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.

Pricing / Packaging / Samples / Ordering

iBuy direct from Intersil	iBuy direct - out of stock	Request samples
Check distributor inventory	Available in RoHS/Pb-Free

	Part No.	Design-In Status	Temp.	Package	MSL	Price US $

	ISL97678IRZ	Active	Ind	32 Ld QFN	2	2.70

	ISL97678IRZ-T	Active	Ind	32 Ld QFN T+R	2	2.70

	ISL97678IRZ-TK	Active	Ind	32 Ld QFN T+R	2	2.70

The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
SMD = Standard Microcircuit Drawing

Technical Documentation

Datasheet(s):
8-Channel 45V 50mA LED Driver
Technical Homepage:
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Tools And Support
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No Models Available

Application Block Diagrams

Applications

Notebook Displays WLED or RGB LED Backlighting
LCD Monitor LED Backlighting

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