1

®

FN9239.2

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

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ISL97632

White LED Driver with Digital Dimming

The ISL97632 represents an efficient and highly integrated

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

that employ 2 to 6 white LEDs for backlighting. With

integrated Schottky diode, OVP, and dynamic digital

dimming capability, the ISL97632 provides a simple, reliable,

and flexible solution to the backlight designers.

The ISL97632 features a simple single-wire digital interface

that provides a 5-bit dimming control. The dimming signal

adjusts the FB voltage and therefore the LED brightness in a

DC manner in 32 linear steps. An EN pin can be used to

provide a zero brightness setting or shutdown power saving

function.

The ISL97632 is available in the 8 Ld DFN (2mmx3mm)

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

suitable for 3, 4, and 6 LEDs backlight applications

respectively. The ISL97632 is specified for operation over

the -40°C to +85°C ambient temperature at input voltage

from 2.4V to 5.5V.

Pinout

ISL97632

(8 LD 2x3 TDFN)

TOP VIEW

Typical Application Circuit

Features

• 5-Bit Digital Dimming Control

• Drives up to 6 LEDs in Series

• OVP (14V, 18V and 26V for 3, 4, and 6 LEDs applications)

• Integrated Schottky Diode

• 2.4V to 5.5V input

• 86% Efficiency

• 1.4MHz Switching Frequency Allows Small LC

• Enable for Shutdown Function or Zero Brightness Setting

• 1µA Shutdown Current

• Internally Compensated

• 8 Ld DFN (2mmx3mm)

• Pb-Free Plus Anneal Available (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

EN

SDIN

LX

VOUT

FBSW

FB

VIN

LX

FBSW

GND

VIN

EN

FB

VOUT

SDIN

10µH or 22µH

Ordering Information

PART NUMBER

(Note)

PART

MARKING

TAPE &

REEL

(QTY)

PACKAGE

(Pb-Free)

PKG.

DWG.#

ISL97632IRT14Z-T

ELB

13”

(6k pcs.)

8 Ld 2x3 TDFN L8.2x3A

ISL97632IRT14Z-TK ELB

13”

(1k pcs.)

8 Ld 2x3 TDFN L8.2x3A

ISL97632IRT18Z-T

ELC

13”

(6k pcs.)

8 Ld 2x3 TDFN L8.2x3A

ISL97632IRT18Z-TK ELC

13”

(1k pcs.)

8 Ld 2x3 TDFN L8.2x3A

ISL97632IRT26Z-T

ELD

13”

(6k pcs.)

8 Ld 2x3 TDFN L8.2x3A

ISL97632IRT26Z-TK ELD

13”

(1k pcs.)

8 Ld 2x3 TDFN L8.2x3A

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100% matte

tin plate termination finish, which are 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

April 10, 2007