The LT3763 is a synchronous buck LED driver controller that delivers over 300W of LED power. Its output voltage can be set from 0V to 55V enabling it to drive a wide range of LEDs in a single string. The 6V to 60V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting. The LT3763 offers both input and output current monitors and limiting, which accurately control both input and output current. It also offers accurate output voltage regulation as well as input regulation, useful for high impedance sources such as solar panels. The constant current and constant voltage regulation makes it ideal for applications ranging from driving high brightness LEDs to battery and supercap charging. Additionally, True Color PWM dimming capability offers dimming ranges as wide as 3,000:1 for LED applications. The unique design utilises four control loops to monitor input current, LED /output current, output and input voltage to deliver optimum performance and reliability.The LT3763 uses two external switching MOSFETs and can deliver from 5W to over 300W of continuous LED power with efficiencies up to 96%. LED current accuracy of ±6% ensures constant lighting while ±1.5% output voltage accuracy offers several LED protection features and enables the converter to operate as a constant voltage/constant current source for charging applications. It can utilise either analog or PWM dimming as required by the application. Furthermore, its switching frequency can be programmed between 200kHz and 1MHz or synchronized to an external clock.The LT3763 is available in a 28-lead thermally enhanced TSSOP package; there is an extended temperature version and a high temperature version, price starting ranges from $4.45 to $5.15 each in 1,000-piece quantities.
