Linear Technology introduces 100V full-featured LED controller...

Linear Technology Corporation introduces 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 the device ideal for a wide variety of applications, including automotive, industrial and architectural lighting. Using an external N-channel MOSFET, the LT3756 can drive up to 20 1A white LEDs with a nominal 12V input to deliver more than 70W. It contains high-side current sensing, allowing it to be used in boost, buck, buck-boost, SEPIC or flyback topologies. The LT3756 delivers over 94% efficiency in boost mode, eliminating the need for any external cooling measures. The frequency adjustment pin allows the user to program the frequency from 100kHz to 1MHz, while optimizing efficiency while minimizing the size and cost of external components. Combined with a 3mm x 3mm QFN or thermally enhanced MSOP-16 package, the LT3756 offers a very compact 70W LED driver solution.
The LT3756 features True Color PWM dimming to provide constant LED color with a dimming range of up to 3000:1. For less demanding requirements, the CTRL pin can be used to provide 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 is used as an input to several LED protection functions, allowing the converter to operate as a constant voltage source.
The LT3756 is available in two versions. The standard LT3756 provides an open LED status pin, while the LT3756-1 replaces the open LED status pin with a frequency sync pin.
The LT3756EUD and LT3756EUD-1 are available from stock in a 16-pin 3mm x 3mm QFN package. The LT3756EMSE and LT3756EMSE-1 are also available in the thermally enhanced MSOP-16E package. The QFN package version is priced at $2.90 each. The MSOP-16E package version is priced at $3.00 each. Also available from stock are the Extended Temperature version or the “I” grade version, the LT3756IUD and LT3755IUD-1, which are available in 1,000-piece quantities and are priced at $3.30 each. Similarly, the "I" grade versions of the MSOP-16 package, the LT3756IMSE and the LT3756IMSE-1, are priced at $3.40 each.

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