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

Sep 24, 2008

Linear Technology


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MILPITAS, CA – September 24, 2008 – 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.

Both the LT3756EUD and LT3756EUD-1 are available from stock in a 16-pin
3mm x 3mm QFN package. The LT3756EMSE and LT3756EMSE-1 are both available in a thermally enhanced MSOP-16E package. Pricing starts at $2.90 each for the QFN package options and $3.00 each for the MSOP-16E options. Also available from stock are extended temperature versions, or “I” grades, namely the LT3756IUD and LT3755IUD-1, with pricing starting at $3.30 each, in 1,000-piece quantities. Similarly, “I” grade options of the MSOP-16 versions, the LT3756IMSE and LT3756IMSE-1 are priced starting at $3.40 each in 1,000-piece quantities.

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

About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule™ products, and many other analog functions. Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.

LT, LTC, LTM and are registered trademarks and uModule and True Color PWM are trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.



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