Linear Technology has announced the H-level 45V high-voltage current sensing DC / DC converter LT3518, which is specifically designed to drive high-current LEDs with a constant current. It has a 3V input voltage range and 40V transient protection to , Making it an ideal choice for various applications such as automotive, industrial and architectural lighting.

H-level version components can operate at junction temperatures up to 150 ° C, while E- and I-level versions can operate at 125 ° C maximum junction temperatures. All electrical characteristics of the E, I and H versions of the components are the same. The H level is tested and guaranteed to operate to a junction temperature of 150? C, which is ideal for applications requiring high temperature environments such as automotive and industrial applications.

The LT3518 can drive up to eight 350mA white LEDs from a nominal 12V input, making it ideal for automotive display backlighting and other applications. At the same time, the device can sense the output current at the high voltage end of the LED, so it can be configured for buck, buck-boost or boost. In boost mode, this device can provide up to 90% efficiency in a tiny 4mm x 4mm QFN package. The LT3518 provides true color PWM (True Color PWMTM) dimming, which can provide fixed LED colors through a dimming range of 3,000: 1. For lower dimming requirements, its CTRL pin can also be used for 10: 1 analog dimming. The fixed-frequency, current-mode architecture allows it to provide stable operation over a wide range of supply and output voltages. The frequency adjustment pin allows the user to set the frequency between 250kHz and 2.5MHz to achieve maximum efficiency and minimize the size of external components.

The LT3518HUF is currently available in a 16-pin QFN package, with a unit price in thousands of pieces starting at $ 3.79.

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