1

®

FN7427

EL1848

White LED Step-Up Regulator

The EL1848 is a constant current

boost regulator specially designed for

driving white LEDs. It can drive 3

LEDs in series or up to 9 LEDs in parallel/series

configuration and achieves efficiency up to 91%.

The brightness of the LEDs is adjusted through a voltage

level on the CNTL pin. When the level falls below 0.1V, the

chip goes into shut-down mode and consumes less than

The EL1848 is available in 8-pin TSOT and MSOP

packages. The TSOT is just 1mm high, compared to

1.45mm for the standard SOT-23 package.

Features

• 2.6V to 13.2V input voltage

• 14V maximum output voltage

• Drives up to 9 LEDs, 3 in a series

• 1MHz switching frequency

• Up to 91% efficiency

• 1µA maximum shut-down current

• Dimming control

• 8-pin TSOT and MSOP packages

• Pb-free Available

Applications

•PDAs

• Cellular phones

• Digital cameras

• White LED backlighting

Typical Connection

Ordering Information

PART

NUMBER

PACKAGE

TAPE & REEL PKG. DWG. #

EL1848IWT-T7

8-Pin TSOT

7” (3K pcs)

MDP0049

EL1848IWT-T7A

8-Pin TSOT

7” (250 pcs)

MDP0049

EL1848IWTZ-T7

(See Note)

8-Pin TSOT

(Pb-free)

7” (3K pcs)

MDP0049

EL1848IWTZ-

T7A (See Note)

8-Pin TSOT

(Pb-free)

7” (250 pcs)

MDP0049

EL1848IY

8-Pin MSOP

-

MDP0043

EL1848IY-T7

8-Pin MSOP

7”

MDP0043

EL1848IY-T13

8-Pin MSOP

13”

MDP0043

NOTE: Intersil Pb-free products employ special Pb-free material

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

plate termination finish, which is 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-020B.

LX

VIN

VOUT

CS

PGND

SGND

CNTL

COMP

4.7µF

0.1µF

1µF

L

33µH

D

2.6V TO

5.5V

5

Ω

Data Sheet

March 31, 2004

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

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.

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