Date: 17/09/2009

45V, 750mA LED driver for high current LED applications from Linear

Linear has introduced the LT3519, a 45V high side current sense DC/DC converter that drives high current LEDs. The combination of an internal 45V, 750mA switch, schottky diode and internal compensation provides a high compact LED driver solution. The LT3519's 3V to 40V input voltage makes it ideal for automotive and industrial lighting applications.

The key features of LT3519 are,

Up to 3000:1 true color PWM dimming
Floating LED current sense from 0V to 45V
Constant current and voltage regulation
Boost, SEPIC, buck-boost mode or buck mode topology
Open LED protection & Open LED status Pin
Programmable undervoltage lockout with hysteresis
CTRL Pin Provides Analog Dimming
Low Shutdown Current: <1µA

There are three switching frequency options available: the LT3519, which switches at 400kHz, the LT3519-1, which switches at 1MHz, and the LT3519-2, offering a 2.2MHz switching frequency, enables better efficiency and minimizes the external component size.

The LT3519 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. Combining a voltage feedback and unique floating current sense feedback, these converters can operate as constant voltage or constant current source, offering maximum design flexibility. Other features include open LED protection, soft-start and thermal protection.

Operating temperature range: -40ºC to 125ºC

Package: MSOP-16 package
Price: Starting at each $2.50 for 1k pieces
LT3519IMS, LT3519IMS-1 and LT3519IMS-2: Each $2.94 for 1k pieces
For more details visit www.linear.com