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PMIC - LED Drivers

The LT3762EFE#PBF is a high-efficiency, high-voltage, high-frequency synchronous buck-boost current mode LED driver that is capable of driving series or parallel strings of LEDs with up to 24V. It features adjustable input under-voltage lockout, output over-voltage protection, and a 0.9V to 4.5V adjustable constant current output. The LT3762EFE#PBF is suitable for various applications, including interior and exterior automotive lighting, LED lighting, RGB lighting, LED display backlighting and LED signage displays.

Application Field

The LT3762EFE#PBF can be used as a high-voltage LED driver in a wide variety of applications. It is well suited for high-power LED automotive lighting, LED lighting, RGB lighting, LED display backlighting and LED signage displays, especially in applications with limited space and high efficiency requirements. With its high efficiency and high power, the LT3762EFE#PBF is also suitable for portable applications that require a small form factor.

Working Principle

The LT3762EFE#PBF is a synchronous buck-boost current mode LED driver that operates in a constant current mode. The LED drive current is adjustable via a single resistor and the LED forward voltage is monitored for current regulation. The forward voltage drop across the LED is monitored with a voltage comparator, and when the LED current drops below the threshold, an external MOSFET is used to switch the LED current in a synchronous buck-boost topology. This helps to maintain the LED current at a constant level even when the input voltage varies. The driver also features a high-frequency switching topology, which helps to reduce the overall size and simplifies thermal management. In addition, the LT3762EFE#PBF can accept a wide range of input voltages and provides an on-board voltage regulator for maximum efficiency.

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