Linear launched 100V full function LED controller LT3756

Linear Technology Corporation (Linear Technology Corporation) launched a 100V DC/DC LT3756 converter, high current detection, the device is designed for driving high current LED. Its 6V to 100V input voltage range makes the device ideal for a wide variety of applications, including automotive, industrial and architectural lighting. The LT3756 uses an external N channel MOSFET that can drive up to 20 1A white LED with a nominal value of 12V, providing over 70W power. It contains a high current detection, so that it can be used for boost, buck, buck boost, SEPIC or flyback topology. LT3756 can provide more than 94% efficiency in boost mode, without any external cooling measures. The frequency regulation pin allows the user to program the frequency in the range of 100kHz to 1MHz, while optimizing the efficiency while minimizing the size and cost of external components. Combined with 3mm x QFN or a thermally enhanced MSOP-16 package, the LT3756 provides a very compact 70W LED driver solution (3mm).

LT3756 uses True Color PWM dimming to provide a constant LED color range of up to 3000:1 dimming. For less demanding requirements, the CTRL pin can be used to provide a 10:1 analog dimming range. The fixed frequency, current mode architecture ensures stable operation over a wide supply and output voltage range. A ground to ground voltage FB pin is used as input to several LED protection functions, so that the converter can operate as a constant voltage source.

There are two versions of LT3756. The standard LT3756 provides an open circuit LED status pin, while the LT3756-1 is replaced with a frequency sync pin to open the LED state pin.

The 16 pin 3mm x QFN 3mm package is available in both LT3756EUD and LT3756EUD-1. LT3756EMSE and LT3756EMSE-1 are also available in a thermally enhanced MSOP-16E package. QFN version of the package price of $2.90 per piece. MSOP-16E version of the package price of $3 per piece. There are also available in the field of extended temperature version or I version, that is, LT3756IUD and LT3755IUD-1, in order to buy 1000 units in bulk, each price of $3.30. Similarly, the MSOP-16 package "I" version of the LT3756IMSE and LT3756IMSE-1 of the 1000 purchase price of $3.40 per piece.

Performance overview: LT3756/-1

3000:1 True Color dimming PWM

Wide input voltage range: 6V to 100V

Output voltage up to 100V

Constant current and constant voltage regulation

100mV high current detection

Boost, buck, buck boost mode, SEPIC or flyback topology to drive LED

Adjustable frequency range: 100kHz to 1MHz

Programmable undervoltage lockout with hysteresis

Open LED state 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 x package or MSOP-16E package

Source: International Electronic Business