LM3549

CONTROL

LOGIC

R_OUT

G_OUT

B_OUT

R_EN

G_EN

B_EN

SDA

EN

SCL

VDD

GND

2.7V to 5.5V

L1

L2

RED LED

GREEN LED

BLUE LED

10 PF

4.7 PF

L1 2.2 PH

VOUT

PWM

FAULT

LM3549

www.ti.com

SNVS640A – AUGUST 2010 – REVISED MAY 2013

LM3549 High Power Sequential LED Driver

Check for Samples: LM3549

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FEATURES

DESCRIPTION

The LM3549 is a high power LED driver with up to

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Over-Current Protection

700mA output current. It has three constant current

•

Over-Temperature Protection

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

•

Under-Voltage Lockout

at a time.

•

LED Open and Short Protection and Detection

LED driver output current settings can be stored to

•

95% Peak Efficiency Buck-Boost Converter

integrated non-volatile memory which allows stand-

•

NVM Memory for Calibration Data and

memory is rewritable so current setting can be

•

Soft Start

changed if needed.

The LM3549 has a fault detection feature that can

APPLICATIONS

detect several different fault conditions. In case of a

fault error flags are set and FAULT output sends

•

Portable Video Projectors

interrupt to control logic. Error flags can be read

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High Power LED Driving

Total brightness can be controlled with PWM input or

KEY SPECIFICATIONS

•

Integrated buck-boost Converter

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Programmable LED Drivers

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700 mA Maximum Drive Current

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±6% Current Accuracy Over Temperature

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24-pin WQFN Package

Figure 1. Typical Application Circuit

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PRODUCTION DATA information is current as of publication date.

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Products conform to specifications per the terms of the Texas

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