RoHS Compliance Information	Size in Kbytes	Date
LM3553 1.2A Dual Flash LED Driver System with I 2 C Compatible Interface	397 Kbytes	6-Mar-08	Download

Part Number

Package

Factory Lead Time

Models

Samples & Electronic Orders

Budgetary Pricing

Std Pack Size

Package Marking Format

Type

Pins

Spec.

MSL Rating

Peak Reflow

RoHS Report

CAD Symbols

Weeks

Qty

Qty

$US each

LM3553SDEV

1.2A Dual Flash LED Driver System with I2C Compatible Interface

Full production

N/A

1+

$123.00

1

-

6 weeks

N/A

LM3553SD

LLP

12

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$1.09

reel of 1000

ZXYTT L3553

6 weeks

N/A

LM3553SDX

LLP

12

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$1.09

reel of 4500

ZXYTT L3553

6 weeks

N/A

General Description

The LM3553 is a fixed frequency, current mode step-up DC/DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

One or more high current flash LEDs can be driven in series either in a high power Flash mode or a lower power Torch mode controlled by either an internal register or the F_EN pin. Additionally a low current (20mA) indicator mode and a fixed output voltage mode are also available.

The LM3553 has 128 current levels and 16 flash safety timer durations that are user adjustable via an I 2C compatible interface. Internal soft-start eliminates large inrush currents at start-up. Over-voltage protection circuitry and 1.2MHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings.

The LM3553 includes a TX pin that forces Torch mode during a flash event allowing for synchronization between the RF power amplifier and Flash/Torch modes. It also includes a multi-function pin (M/F) that can serve as a GPIO and a hardware RESET pin.

The LM3553 is available in National's 3mm by 3mm LLP12 package.

Design Tools

Title	Size in Kbytes	Date
Article - The multiple challenges involved in flash LED driver selection--and how to solve them			View

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Application Notes

Title	Size in Kbytes	Date
AN-1780: Application Note 1780 LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface	1427 Kbytes	12-Mar-08	Download

More Application Notes

Title	Size in Kbytes	Date
AN-1495: Application Note 1495 LM3552 White LED Flash Driver Evaluation Board	626 Kbytes	27-Sep-06	Download
AN-1495 (Chinese): Application Note 1495 LM3552 White LED Flash Driver Evaluation Board	208 Kbytes