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100V, Full Featured LED Controller for Boost, Buck or Buck-Boost High Current LED Applications

Linear Technology announces the LT3756, a 100V, high-side current sense DC/DC converter designed to drive high current LEDs.


Its 6V to 100V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting. The LT3756 uses an external N-channel MOSFET and can drive up to 20 1A white LEDs from a nominal 12V input, delivering in excess of 70 watts. It incorporates a high-side current sense, enabling it to be used in boost, buck, buck-boost or SEPIC and flyback topologies. The LT3756 can deliver efficiencies of over 94% in boost mode, eliminating any need for external heat sinking. A frequency adjust pin permits the user to program the frequency between 100kHz and 1MHz, optimizing efficiency while minimizing external component size and cost. Combined with a 3mm x 3mm QFN or a thermally enhanced MSOP-16 package, the LT3756 offers a very compact 70-watt LED driver solution.

The LT3756 uses True Color PWM™ dimming, delivering constant LED color with dimming ranges up to 3,000:1. For less demanding requirements, the CTRL pin can be used to offer a 10:1 analog dimming range. Its fixed frequency, current mode architecture ensures 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, making it possible for the converter to operate as a constant-voltage source.

Two versions of the LT3756 are available. The standard LT3756 offers an Open LED Status pin, and the LT3756-1 replaces the Open LED Status pin with a frequency synchronization pin.


  Full-Featured LED Controller Delivers over 50 Watts of LED Power

Summary of Features: LT3756/-1
3000:1 True Color PWM Dimming
Wide Input Voltage Range: 6V to 100V
Output Voltage Up to 100V
Constant-Current & Constant-Voltage Regulation
100mV High Side Current Sense
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,
SEPIC or Flyback Topology
Adjustable Frequency: 100kHz to 1MHz
Programmable Undervoltage Lockout with Hysteresis
Open LED Status Pin (LT3756)
Frequency Synchronization (LT3756-1)
PWM Disconnect Switch Driver
CTRL Pin Provides Analog Dimming
Low Shutdown Current: <1uA
Programmable Soft-Start

Thermally Enhanced 16-Lead QFN 3mm × 3mm Package
or MSOP-16E Package

Links & Datasheet:

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