LTC3649IFE#TRPBF

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LTC3649IFE#TRPBF Application Field and Working Principle

The LTC3649IFE#TRPBF is a synchronous switching regulator system-on-chip (SoC) that integrates a high-voltage high-efficiency boost-buck LED driver and a secondary-side constant current source. This synchronous DC/DC converter is targeted for low power, high-efficiency buck-boost LED driver applications where input and output voltages can vary from 2.5 V to 18 V. This type of switching regulator offers designers the flexibility to design electronics with a wide range of applications, such as automotive lighting, low-power motor control, and industrial process control, among many others.

The LTC3649IFE#TRPBF integrates dual synchronous buck PWM controllers inside the same package. The integrated dual PWM controllers provide a simpler solution for adjusting the output current of the regulator. The LTC3649IFE#TRPBF is also configurable with a single-wire shared voltage-mode control, with one of the controllers acting as a master and controlling the voltage across the two PWM controllers.

The LTC3649IFE#TRPBF is designed for efficient DC/DC conversion, providing a wide range of output currents and adjustable switching frequency up to 4 MHz. The efficient control loop has a high bandwidth that can maintain stable operation over wide input and output voltage ranges. The LTC3649IFE#TRPBF supports a wide range of input and output voltages, allowing designers to optimize LED performance for a variety of applications without resorting to complex solutions.

The device is also designed for improved thermal performance. It features an internal thermal monitor and two external temperature sensing inputs for additional temperature sensing. The LTC3649IFE#TRPBF also features over-temperature protection that prevents thermal runaway by automatically reducing the switching frequency when the die temperature reaches a preset limit.

The LTC3649IFE#TRPBF is a single-chip solution that integrates all power conversion components, greatly reducing design complexity and time-to-market. The device features on-chip slew-rate control, which allows designers to minimize input EMI, and features a wide range of operating modes with low start-up and shutdown currents.

The LTC3649IFE#TRPBF is an ideal solution for a variety of LED lighting applications. It can be used to create highly efficient buck-boost LED drivers, which combine the benefits of buck and boost converters, allowing for greater control and flexibility over LED performance. This converter can support up to three different LED strings, each with its own regulated current output, and provides onboard programmable current sources for each of the LEDs.

In addition, the LTC3649IFE#TRPBF also provides comprehensive protection features, such as over-voltage and over-current protection. The device also features a 2.5 V to 18 V input voltage range, making it suitable for a wide variety of applications. The LTC3649IFE#TRPBF is an excellent choice for applications which require high efficiency, maximum flexibility, and minimal design complexity.

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