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National Semiconductor Electronic Components Datasheet

LM3553 Datasheet

1.2A Dual Flash LED Driver System

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March 6, 2008
LM3553
1.2A Dual Flash LED Driver System with I2C Compatible
Interface
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 FEN 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 I2C compatible in-
terface. Internal soft-start eliminates large inrush currents at
start-up. Over-voltage protection circuitry and 1.2MHz switch-
ing 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 hard-
ware RESET pin.
The LM3553 is available in National's 3mm by 3mm LLP12
package.
Features
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 FEN Pin
Active Low Hardware Reset
Multi-Function Pin (RESET and GPIO)
Low Profile 12-pin LLP Package (SDF12A: 3mm x 3mm x
0.8mm, 0.4mm pitch)
Applications
Camera Phone LED Flash
Smartphone and PDA Flash
LED Backlight
Typical Application Circuits
© 2008 National Semiconductor Corporation 201714
20171415
Solution Size
20171419
www.national.com


National Semiconductor Electronic Components Datasheet

LM3553 Datasheet

1.2A Dual Flash LED Driver System

No Preview Available !

www.DataShCeeot4Un.cnomection Diagram
Pin Descriptions
Pin
4
5
6
2, 11
DAP
1
3
8
10
9
7
12
Name
VIN
SW
OVP
D1, D2
GND
ISET
FEN
SCL
SDA
VIO
TX
M/F
20171416
Function
Input Voltage. Input range: 2.7V to 5.5V.
Switch Pin
Over Voltage Protection Pin
Regulated current sink inputs
Ground
Current sense input. Connect a 1% 16.5kresistor to ground to set the full scale LED current.
Flash enable pin.
Serial clock pin.
Serial data I/O pin.
Digital Reference Voltage level input pin.
RF PA synchronization control pin. High = Forced Torch mode.
Hardware RESET or General purpose I/O. Function set through Multi-Function Control Register
Ordering Information
Order Number
LM3553SD-NOPB
LM3553SDX-NOPB
LM3553SD-HALF
LM3553SDX-HALF
Type
No Lead, Non-
Halogenated
No Lead, Non-
Halogenated
No Lead,
Halogenated
No Lead,
Halogenated
Package
SDF12A
SDF12A
SDF12A
SDF12A
Package Marking
L3553
L3553
L3553
L3553
Supplied As
1000 units, Tape-and-Reel
4500 units, Tape-and-Reel
1000 units, Tape-and-Reel
4500 units, Tape-and-Reel
www.national.com
2


Part Number LM3553
Description 1.2A Dual Flash LED Driver System
Maker National Semiconductor
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LM3553 Datasheet PDF





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