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45-V, 750-mA Driver Powers High-Current LED Applications

Designed to drive high-current LEDs, the LT3519 is a 45-V, high-side, current-sense DC/DC converter. The device’s 3-V to 40-V input-voltage range makes it suitable for applications such as automotive and industrial lighting. The combination of an internal 45-V, 750-mA switch, Schottky diode, and internal compensation provides a highly compact LED driver subsystem. The LT3519 can drive up to ten 100-mA white LEDs from a 12-V input. It can deliver efficiencies up to 90% in boost mode from a compact MSOP-16E package. The LT3519 uses True Color PWM dimming to deliver constant LED color with ranges of more than 3000:1. The device's fixed-frequency, constant-current, constant-voltage regulation provides stable operation over a wide range of supply and output voltages, while ensuring uniform brightness of LEDs. There are three switching frequency options available: the LT3519, which switches at 400 kHz; the LT3519-1, which switches at 1 MHz; and the LT3519-2, offering a 2.2-MHz switching frequency. The LT3519 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. The LT3519EMS, LT3519EMS-1 and LT3519EMS-2 are available in an MSOP-16 package and start at $2.50 each in lots of 1000. Extended temperature versions, namely the LT3519IMS, LT3519IMS-1 and LT3519IMS-2, cost $2.94 each in similar quantities. All versions are available from stock. LINEAR TECHNOLOGY CORP., Milpitas, CA. (408) 432-1900.


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