LM3549 Texas instruments

LM3549

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LM3549

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Описание

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.

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

Key Specifications

Integrated buck-boost Converter
Programmable LED Drivers
700 mA Maximum Drive Current
±6% Current Accuracy Over Temperature
24-pin WQFN Package

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Number of channels	3
LED current per channel (mA)	235
LED configuration	Parallel
Program memory	Yes
Topology	Boost
Programmable ramp control	Yes
Vin (min) (V)	2.7
Vin (max) (V)	5.5
Iout (max) (A)	0.72
Features	I2C control
Iq (typ) (mA)	1.6
Shutdown current (ISD) (typ) (µA)	1
Operating temperature range (°C)	-30 to 85
Rating	Catalog