EL1848IWTZT7A INTERSIL [Intersil Corporation], EL1848IWTZT7A Datasheet

EL1848IWTZT7A

Manufacturer Part Number

EL1848IWTZT7A

Description

White LED Step-Up Regulator

Manufacturer

INTERSIL [Intersil Corporation]

Datasheet

1.EL1848IWTZT7A.pdf (12 pages)

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White LED Step-Up Regulator

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

1µA of supply current for V

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.

Ordering Information

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.

EL1848IWT-T7

EL1848IWT-T7A

EL1848IWTZ-T7

(See Note)

EL1848IWTZ-

T7A (See Note)

EL1848IY

EL1848IY-T7

EL1848IY-T13

NUMBER

PART

8-Pin MSOP

8-Pin TSOT

PACKAGE

(Pb-free)

The EL1848 is a constant current

boost regulator specially designed for

driving white LEDs. It can drive 3

less than 5.5V.

TAPE & REEL PKG. DWG. #

7” (250 pcs)

7” (3K pcs)

Data Sheet

13”

7”

MDP0049

MDP0043

1-888-INTERSIL or 321-724-7143

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

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

2.6V TO

CTRL

5.5V

March 31, 2004

4.7µF

0.1µF

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

Intersil (and design) is a registered trademark of Intersil Americas Inc.

VIN

CNTL

COMP

33µH

PGND

SGND

VOUT

EL1848

FN7427

5Ω

1µF

Related parts for EL1848IWTZT7A

EL1848IWTZT7A Summary of contents

Page 1

Data Sheet 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 LEDs in parallel/series configuration and achieves efficiency up ...

Page 2

Pinouts EL1848 (8-PIN TSOT) TOP VIEW COMP 1 CNTL 2 VOUT EL1848 8 VIN SGND 5 PGND EL1848 (8-PIN MSOP) TOP VIEW CNTL VIN 2 7 COMP PGND 3 6 ...

Page 3

Absolute Maximum Ratings (T = 25°C) A COMP, CNTL SGND -0. SGND . ...

Page 4

Block Diagram 2. 4.7µF COMP C COMP 0.1µF PWM SIGNAL CNTL V CNTL Typical Performance Curves All performance curves and waveforms are taken with C series; unless otherwise specified. 1.05 1.04 1.03 1.02 1.01 1 2.5 ...

Page 5

Typical Performance Curves All performance curves and waveforms are taken with C series; unless otherwise specified 0.5 1 1.5 V (V) CNTL FIGURE LED BAT54HT1 L V ...

Page 6

Typical Performance Curves All performance curves and waveforms are taken with C series; unless otherwise specified. BAT54HT1 33µH 4.7µ VIN LX 3 VOUT CTRL CNTL PGND 1 6 COMP SGND ...

Page 7

Typical Performance Curves All performance curves and waveforms are taken with C series; unless otherwise specified. BAT54HT1 15µH 4.7µ VIN LX 3 VOUT CTRL 2 5 CNTL PGND 1 6 COMP SGND ...

Page 8

Waveforms All performance curves and waveforms are taken with C series; unless otherwise specified CNTL I LED 10ms/DIV FIGURE 13. START-UP V CNTL LED 20ms/DIV FIGURE 15. TRANSIENT RESPONSE V =0.34V, I ...

Page 9

Detailed Description The EL1848 is a constant current boost regulator specially designed for driving white LEDs. It can drive LEDs in series or 9 LEDs in parallel/series configuration and achieves efficiency up to 91%. The brightness of ...

Page 10

For the same inductance, higher overall efficiency can be obtained by using lower DCR inductor. EFFICIENCY =3.3V FOR IN DIFFERENT L L=22µH 83 L=33µ L=Coilcraft LPO1704 SERIES 1mm HEIGHT ...

Page 11

TSOT Package Outline Drawing 11 EL1848 ...

Page 12

MSOP Package Outline Drawing NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at <http://www.intersil.com/design/packages/index.asp> All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 ...

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