LM3553 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – 1.2A Dual Flash LED Driver System with I2C Compatible

LM3553
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SNVS414B – FEBRUARY 2008 – REVISED MAY 2013
LM3553 1.2A Dual Flash LED Driver System with I²C Compatible Interface
Check for Samples: LM3553
FEATURES
1
•2 Accurate and Programmable LED Current up
to 1.2A in 128 Steps
• Total Solution Size < 30mm²
• 90% Peak Efficiency
• Drives 2 LEDs in Series with 1.2A from 5V
Input
• Drives 2 LEDs in Series with 600mA from 3.0V
Input
• Drives 1 LED with 1.2A from 3.0V Input
• Adjustable Over-Voltage Protection Allows for
Single or Series LED Operation
• Four Operating Modes: Torch, Flash, Indicator,
and Voltage Mode (4.98V)
• Programmable Flash Pulse Safety Timer in 16
Steps
• TX Input Ensures Synchronization with RF
Power Amplifier Pulse or Prevents LED from
Overheating
• LED Disconnect During Shutdown
• Flash/Imager Synchronization via F_EN Pin
• Active Low Hardware Reset
• Multi-Function Pin (RESET and GPIO)
• Low Profile 12-pin WSON Package
(DQB0012A: 3mm x 3mm x 0.8mm, 0.4mm
pitch)
APPLICATIONS
• Camera Phone LED Flash
• Smartphone and PDA Flash
• LED Backlight
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.
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 a 3mm by 3mm package.
Typical Application Circuits
2.2 PH
CIN
10 PF
RSET
COUT
4.7 PF
SW
OVP
VIN
D1
FEN
D2
LM3553
TX
ISET
GND SCL SDA
M/F
VIO
600 mA Flash
Current
COUT ^D1
L
2.5 ^2.25
9.0
IC 9.0
CIN
RSET 0.5
29.25mm² with 0.4mm spacing
around large components (IC and L)
Components:
L = Toko FDSE0312-2R2M
CIN = Murata GRM188R60J106ME47D
COUT = Murata GRM21BR61E475KA12L
LEDs = Lumileds LXCL ± PWF3
Or equivalent
Figure 1.
Figure 2. Solution Size
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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