Analog Devices Inc

LT3756 / LT3756-1 LED Controller

LED controller for high current LED applications from Analog Devices

Image of Analog Devices' LT3756/LT3756-1 LED ControllerAnalog Devices' LT3756 and LT3756-1 are DC / DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7 V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100 kHz to 1 MHz to optimize efficiency, performance or external component size.

The LT3756/LT3756-1 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability. Both parts are available in the 16-lead QFN (3 mm x 3 mm) and MSOP packages.

Features
  • 3000:1 true color PWM™ dimming
  • Output voltage up to 100 V
  • Wide input voltage range: 6 V to 100 V
  • 100 mV high side current sense
  • Adjustable frequency: 100 kHz to 1 MHz
  • Programmable undervoltage lockout with hysteresis
  • Frequency synchronization (LT3756-1)
  • CTRL pin provides analog dimming
  • Programmable soft-start
  • Constant-current and constant-voltage regulation
  • Drives LEDs in boost, buck Mode, buck-boost mode, SEPIC or flyback topology
  • Open LED protection
  • Open LED status pin (LT3756)
  • PWM disconnect switch driver
  • Low shutdown current: < 1 µA
  • Thermally enhanced 16-lead QFN (3 mm × 3 mm) and MSOP packages
Applications
  • High power LED applications
  • Industrial
  • Automotive

LT3756/LT3756-1 LED Controllers

ImageManufacturer Part NumberDescriptionAvailable QuantityPrice
IC LED DRIVER CTRLR PWM 16MSOPLT3756EMSE#PBFIC LED DRIVER CTRLR PWM 16MSOP242 - Immediate$10.61View Details
IC LED DRIVER CTRLR PWM 16QFNLT3756EUD#PBFIC LED DRIVER CTRLR PWM 16QFN805 - Immediate$8.80View Details
IC LED DRIVER CTRLR PWM 16QFNLT3756EUD-1#PBFIC LED DRIVER CTRLR PWM 16QFN202 - Immediate$10.35View Details
IC LED DRIVER CTRLR PWM 16MSOPLT3756EMSE-1#PBFIC LED DRIVER CTRLR PWM 16MSOP7486 - Immediate$10.61View Details
Published: 2013-10-11

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LT3756/LT3756-1/LT3756-2 - 100VIN, 100VOUT LED Controller LT3756 LED controller key features include 3,000:1 true color PWM dimming, frequency synchronization, and an output voltage up to 100V.