Linear Technology Launches New LED Driver

Linear Technology has launched a synchronous buck-boost DC/DC LED driver and voltage controller delivering over 100W for lighting.

The new driver features 4.7V to 60V input voltage range. It suits for applications in automotive, industrial and architectural lighting.

With an adjustable output voltage from 0V to 60V, the LT3791 can be used to drive LEDs in a single string. Its internal 4-switch buck-boost controller operates from input voltages above, below or equal to the output voltage.

The chip's design uses three control loops to monitor input current, LED current and output voltage to deliver optimal performance and reliability.

It uses four external switching mosfets and delivers from 5W to over 100W of continuous LED power with efficiencies up to 98.5%.

LED current accuracy of +6% ensures constant lighting while + 2% output voltage accuracy enables the converter to operate as a constant voltage source. The LT3791 utilizes either analog or PWM dimming as required by the application.

The switching frequency can be programmed between 200kHz and 700kHz or synchronized to an external clock.

Additional features include output disconnect, input and output current monitors, open and shorted LED detection and integrated fault protection.

The LT3791EFE is available in 38-lead thermally enhanced TSSOP package.

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