ISL97677 SMBus/I<sup>2</sup>C 8-Channel LED Driver

ISL97677

SMBus/I²C 8-Channel LED Driver

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

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	ISL97677IRZ

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	ISL97677IRZ	Details
	ISL97677IRZ-T	Details
	ISL97677IRZ-TK	Details

Datasheet
	ISL97677
	SMBus/I²C 8-Channel LED Driver

Topologies

Inductor Boost

# of LEDs (max)

# of Channels

Digital Interface

SMBus/I²C

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)
Dimming Controls
- SMBus/I²C 8-Bit PWM Dimming
- SMBus and External PWM DPST Dimming Control
- External PWM Dimming with or without SMBus/I²C
- PWM Dimming range from 0.4% to 100%
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 ISL97677 is an SMBus/I²C controlled multi-channel LED driver for notebook and monitor LCD backlight applications with PWM dimming and fault reporting functions. The ISL97677 is capable of driving typically 96 pieces of 3.4V/50mA LEDs. The ISL97677 has multiple channels of voltage controlled current sources with typical currents matching to ±0.7%, 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 ISL97677 features dynamic headroom control that monitors the highest LED forward voltage string and uses its feedback signal for output regulation.

The ISL97677 can operate in multiple modes of operations. It can be controlled by SMBus/I²C communications and an external PWM dimming signal with currents matching of ±1% across all ranges.

The ISL97677 features extensive protection functions that include string open and short circuit detections, OVP, and OTP. The fault conditions will be recorded in the Fault/Status register. There are selectable short-circuit thresholds and the switching frequency can be programmed between 500kHz and 1.5MHz.

ISL97677 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 $

	ISL97677IRZ	Active	Ind	32 Ld QFN	2	2.80

	ISL97677IRZ-T	Active	Ind	32 Ld QFN T+R	2	2.80

	ISL97677IRZ-TK	Active	Ind	32 Ld QFN T+R	2	2.80

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):
SMBus/I²C 8-Channel LED Driver
Technical Homepage:
Display Products

Tools And Support
iSim Design Simulation
No Models Available

Application Block Diagrams

Applications

Notebook Displays WLED or RGB LED Backlighting
LCD Monitor LED Backlighting

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