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36V 2.2MHz Buck LED Driver Powers 500mA LEDs from a 2mm x 3mm DFN

Linear Technology announces the LT3592, a 36V step-down DC/DC converter designed to operate as a constant current LED driver.



Its internal 36V, 900mA switch enables it to drive up to six 500mA white LED in a single string from a 36V input for industrial and LED signage applications.

It can also drive two 500mA LEDs from a 12V lead acid battery input for automotive applications. Series connection of the LEDs provides identical LED currents, resulting in uniform brightness and eliminating the need for ballast resistors. The LT3592’s switching frequency can be adjusted from 400kHz to 2.2MHz via a single resistor. This enables designers to set the switching frequency above critical frequency bands such as AM radio while minimizing external component size. Offered in a 2mm x 3mm DFN-10 or MSOP-10 package, the LT3592 provides a very compact 500mA LED driving solution.

LED current levels of either 10% or 100% of the programmed value are selectable by driving the LT3592’s BRIGHT pin. The LT3592 utilizes a fixed frequency, high side sense, current mode architecture which provides fast transient response and cycle-by-cycle current limiting. Other features include: shorted and open LED protection, single wire LED capability and thermal shutdown.

 36V, 500mA Buck Mode LED Driver in 2mm x 3mm DFN Package

Summary of Features: LT3592

Wide Input Voltage Range: Operation from 3.6V to 36V
Resistor Adjustable 400kHz to 2.2MHz Switching
Shorted & Open LED Protected
Internal Switch Current Sense Resistor
External Resistor Programs LED Current, Pin Selects
10:1 Ratio
50mA/500mA LED Current Settings
Small Thermally Enhanced 10-Lead DFN (2mm × 3mm)
& MSOP-10 Packages




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