LM3549 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – Evaluation Kit high power LED driver with up to 700mA

LM3549
www.ti.com
SNVS640A – AUGUST 2010 – REVISED MAY 2013
LM3549 High Power Sequential LED Driver
Check for Samples: LM3549
FEATURES
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•2 Over-Current Protection
• Over-Temperature Protection
• I²C Compatible Interface
• Under-Voltage Lockout
• LED Open and Short Protection and Detection
• 95% Peak Efficiency Buck-Boost Converter
• NVM Memory for Calibration Data and
Standalone Usage without I²C Control
• Soft Start
APPLICATIONS
• Portable Video Projectors
• High Power LED Driving
KEY SPECIFICATIONS
• Integrated buck-boost Converter
• Programmable LED Drivers
• 700 mA Maximum Drive Current
• ±6% Current Accuracy Over Temperature
• 24-pin WQFN Package
DESCRIPTION
The LM3549 is a high power LED driver with up to
700mA output current. It has three constant current
LED drivers and a buck boost SMPS for driving RGB
LEDs with high efficiency. LED drivers are designed
for sequential drive so only one driver can be enabled
at a time.
LED driver output current settings can be stored to
integrated non-volatile memory which allows stand-
alone operation without I²C interface. Non-volatile
memory is rewritable so current setting can be
changed if needed.
The LM3549 has a fault detection feature that can
detect several different fault conditions. In case of a
fault error flags are set and FAULT output sends
interrupt to control logic. Error flags can be read
through I²C interface.
Total brightness can be controlled with PWM input or
with master fader register if I²C interface is used.
L1 2.2 PH
V_IN
2.7V to 5.5V
C_IN
10 PF
CONTROL
LOGIC
L1
VDD
L2
VOUT
C_OUT
4.7 PF
EN
SDA
SCL
R_EN
G_EN
B_EN
PWM
FAULT
LM3549
GND
R_OUT
G_OUT
B_OUT
RED LED
GREEN LED
BLUE LED
Figure 1. Typical Application Circuit
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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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