1

®

FN6626.0

ISL78100

High Power LED Driver

The ISL78100 is a high-power LED backlight driver with an

integrated 36V FET designed to drive up to 8 high-power

LEDs in series. The PWM converter runs from an internally

generated 1MHz clock. With efficiencies over 90%, the

regulator provides tight control of LED current and may be

configured in either boost or buck topologies, allowing from

3 to 8 series diodes to be driven from wide input voltages.

LED light level may be controlled either by:

1. LED DC bias current set via the LEVEL pin, or

2. External low frequency PWM control via the

ENABLE/PWM pin.

In both control modes, optional over-temperature thermal

protection of the LED reduces the LED DC bias current

above an adjustable set temperature, protecting the LED

from thermal damage. An optional fault monitor drives an

external FET between the input supply and inductor,

providing short circuit current protection for the LED and

inductor as well as load dump protection for automotive

applications. For low cost applications the pass transistor

may be omitted and the fault pin bypassed.

The ISL78100 is packaged in a 20 Ld 4mmx4mm QFN

package and is specified for operation over the -40°C to

+105°C temperature range.

Features

• Drives 3 to 8 high-power LEDs in series, up to 32V

• 2.7V to 16V input voltage range

• Boost or Buck configurable switch

• 3A integrated FET

• Automotive load dump protection

• Light output temperature compensation

• LED over-temperature protection

• LED disconnect

• PWM/analog light level control

• Small, 20 Ld 4mmx4mm QFN package

• TS-16949 and AEC-Q100 Compliant

• Pb-free (RoHS compliant)

Applications

• Automotive display backlighting

• Automotive LED lighting

Pinout

ISL78100

(20 LD 4X4 QFN)

TOP VIEW

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

PACKAGE

(Pb-free)

PKG.

DWG. #

ISL78100ARZ

781 00ARZ

20 Ld 4x4 QFN

L20.4x4C

ISL78100ARZ-TK*

781 00ARZ

20 Ld 4x4 QFN

Tape and Reel

L20.4x4C

ISL78100ARZ-T*

781 00ARZ

20 Ld 4x4 QFN

Tape and Reel

L20.4x4C

*Please refer to TB347 for details on reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach

materials and 100% matte tin plate PLUS ANNEAL - e3 termination

finish, which is RoHS compliant and compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J STD-020.

1

2

3

4

15

14

13

12

VDC

VHI

OVP

SWD1

ENL

MODE

EN/PWM

SWS1

THERMAL

PAD

5

SWD2

11 SWS2

Data Sheet

December 17, 2007

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

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2007. All Rights Reserved

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