1

®

FN6264.3

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

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ISL97634

White LED Driver with Wide PWM

Dimming Range

The ISL97634 represents an efficient and highly integrated

PWM boost LED driver that is suitable for 1.8” to 3.5” LCDs

that employ 2 to 7 white LEDs for backlighting. With

integrated Schottky diode, OVP, and wide range of PWM

dimming capability, the ISL97634 provides a simple, reliable,

and flexible solution to the backlight designers.

The ISL97634 features a wide range of PWM dimming

control capability. It allows dimming frequency as low as DC

to 32kHz beyond audible spectrum. The ISL97634 also

features a feedback disconnect switch to prevent the output

from being modulated by the PWM dimming signal that

minimizes system disturbance.

The ISL97634 is available in the 8 Ld TDFN (2mmx3mm)

package. There are 14V, 18V, and 26V OVP options that are

suitable for 3 LEDS, 4 LEDs, and 7 LEDs (3.5V/20mA type)

backlight applications respectively. The ISL97634 is

specified for operation over the -40°C to +85°C ambient

temperature at input voltage from 2.4V to 5.5V.

Pinout

ISL97634

(8 LD TDFN)

TOP VIEW

Typical Application Circuit

Features

• Drives Up to 7 LEDs in Series (3.5V/20mA type)

• OVP (14V, 18V, and 26V for 3, 4 and 7 LEDs Applications)

• PWM Dimming Control From DC to 32kHz

• Output Disconnect Switch

• Integrated Schottky Diode

• 2.4V to 5.5V Input

• 85% Efficiency

• 1.4MHz Switching Frequency Allows Small LC

• 1µA Shutdown Current

• Internally Compensated

• 8 Ld TDFN (2mmx3mm)

• Pb-Free (RoHS Compliant)

Applications

• LED Backlighting for:

- Cell phones

- Smartphones

-MP3

-PMP

- Automotive Navigation Panel

- Portable GPS

2

3

4

1

7

6

5

8

GND

VIN

PWM/EN

NC

LX

VOUT

FBSW

FB

VIN

LX

FBSW

GND

VIN

PWM/EN

FB

VOUT

NC

10µH or 22µH

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

PACKAGE

(Pb-free)

Tape & Reel

PKG.

DWG.

#

ISL97634IRT14Z-T

ELE

8 Ld 2x3 TDFN

L8.2x3A

ISL97634IRT14Z-TK

ELE

8 Ld 2x3 TDFN

L8.2x3A

ISL97634IRT18Z-T

ELF

8 Ld 2x3 TDFN

L8.2x3A

ISL97634IRT18Z-TK

ELF

8 Ld 2x3 TDFN

L8.2x3A

ISL97634IRT26Z-T

ELG

8 Ld 2x3 TDFN

L8.2x3A

ISL97634IRT26Z-TK

ELG

8 Ld 2x3 TDFN

L8.2x3A

*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..

Data Sheet

March 7, 2008