Linear Technology Offers 36V 2.2MHz Buck LED Driver

Linear Technology has announced its 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. The LT3592EDDB and LT3592EMSE are both available from stock in 2mm x 3mm DFN-10 or MSOP-10E packages, respectively, priced starting at $1.65 each and $1.75, respectively, in 1,000-piece quantities. For applications requiring a temperature range, I-grade versions, namely the LT3592IDDB and LT3592IMSE, are also available from stock. 1,000-piece pricing starts at $1.90 each and $2.01, respectively.