LM3553

2.2 PH

4.7 PF

10 PF

SCL

SDA

GND

D1

OVP

SW

TX

D2

M/F

600 mA Flash

Current

Components:

L = Toko FDSE0312-2R2M

LEDs = Lumileds LXCL ± PWF3

Or equivalent

29.25mm

2

with 0.4mm spacing

around large components (IC and L)

9.0

9.0

2.25

0.5

2.5

L

IC

CIN

D1

COUT

RSET

LM3553

www.ti.com

SNVS414B – FEBRUARY 2008 – REVISED MAY 2013

Check for Samples: LM3553

1

FEATURES

•

Multi-Function Pin (RESET and GPIO)

•

Low Profile 12-pin WSON Package

2

•

Accurate and Programmable LED Current up

(DQB0012A: 3mm x 3mm x 0.8mm, 0.4mm

to 1.2A in 128 Steps

pitch)

•

•

90% Peak Efficiency

APPLICATIONS

•

Drives 2 LEDs in Series with 1.2A from 5V

•

Camera Phone LED Flash

Input

•

Smartphone and PDA Flash

•

Drives 2 LEDs in Series with 600mA from 3.0V

•

LED Backlight

Input

•

Drives 1 LED with 1.2A from 3.0V Input

DESCRIPTION

•

Adjustable Over-Voltage Protection Allows for

The LM3553 is a fixed frequency, current mode step-

Single or Series LED Operation

up DC/DC converter with two regulated current sinks.

•

Four Operating Modes: Torch, Flash, Indicator,

The device is capable of driving loads up to 1.2A

and Voltage Mode (4.98V)

from a single-cell Li-Ion battery.

•

Programmable Flash Pulse Safety Timer in 16

The LM3553 includes a TX pin that forces Torch

Steps

mode

during

a

flash

event

allowing

for

synchronization between the RF power amplifier and

•

TX Input Ensures Synchronization with RF

Flash/Torch modes. It also includes a multi-function

Power Amplifier Pulse or Prevents LED from

pin (M/F) that can serve as a GPIO and a hardware

Overheating

RESET pin.

•

LED Disconnect During Shutdown

The LM3553 is available in a 3mm by 3mm package.

•

•

Active Low Hardware Reset

Typical Application Circuits

Figure 1.

Figure 2. Solution Size

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.