EL1848IY Intersil, EL1848IY Datasheet

EL1848IY

Manufacturer Part Number

EL1848IY

Description

IC LED DRIVR WHITE BCKLGT 8-MSOP

Manufacturer

Intersil

Type

Backlight, White LEDr

Datasheet

1.EL1848IWT-T7.pdf (12 pages)

Specifications of EL1848IY

Constant Current

Yes

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight

Type - Secondary

White LED

Frequency

800kHz ~ 1.2MHz

Voltage - Supply

2.6 V ~ 13.2 V

Voltage - Output

14V

Mounting Type

Surface Mount

Package / Case

8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

90mA

Internal Switch(s)

Yes

Efficiency

91%

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current page: 1 of 12
Download datasheet (483Kb)

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 EL1848IY

EL1848IY Summary of contents

Page 1

... EL1848IY 8-Pin MSOP - EL1848IY-T7 8-Pin MSOP 7” EL1848IY-T13 8-Pin MSOP 13” 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 ...

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

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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