LT3756/LT3756-1 LED Controller


LED Controller for High Current LED Applications

The 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 7V 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 100kHz to 1MHz 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 (3mm x 3mm) and MSOP packages.

LT3756/LT3756-1/LT3756-2 - 100VIN, 100VOUT LED Controller
Features
  • 3000:1 True Color PWM™ Dimming
  • Output Voltage Up to 100V
  • Wide Input Voltage Range: 6V to 100V
  • 100mV High Side Current Sense
  • Adjustable Frequency: 100kHz to 1MHz
  • 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: <1µA
  • Thermally Enhanced 16-Lead QFN
    (3mm × 3mm) and MSOP Packages
Applications

  • High Power LED Applications
  • Industrial
  • Automotive

LT3756/LT3756-1

Manufacturer Part Number Description Available Quantity Datasheets
LT3756EMSE#PBF IC LED DRVR HP CONS CURR 16-MSOP 4676
LT3756EMSE-1#PBF IC LED DRVR HP CONS CURR 16-MSOP 718
LT3756EUD#PBF IC LED DRVR HP CONST CURR 16-QFN 3057
LT3756EUD-1#PBF IC LED DRVR HP CONST CURR 16-QFN 253