LT3697EMSE#PBF

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LT3697EMSE#PBF Application Field and Working Principle

DC-DC switching regulators are electronic regulators which use switching technology to convert electrical energy from one voltage level to another. The LT3697EMSE#PBF is a high performance, low IQ (quiescent current) synchronous buck regulator designed to provide excellent efficiency and output voltage accuracy. It can efficiently operate from input voltages from 4.75 V up to 80 V and provides very low output voltage ripple and low noise operation. By integrating a high side and low side MOSFET, the LT3697EMSE#PBF eliminates the cost and complexities of an external driver circuit, making it an excellent choice for applications where space and cost are a concern.

Application Field

The LT3697EMSE#PBF DC-DC buck regulator is primarily used in applications that require a low output voltage setting. It is often used in audio amplifiers, battery powered systems, portable applications, point-of-load (POL) converters, automotive power systems, networking and communication equipments and many more. Its load step response is excellent over a wide range of input supply and load changes and is ideal for automotive infotainment systems, factory automation equipment and medical devices.

Working Principle

The LT3697EMSE#PBF synchronous buck regulator works by converting a DC or AC voltage at its input to a regulated output voltage. It achieves this process through the use of two switched-mode power supplies (SMPSs), or boost stages. The first boost stage, known as the input voltage switch (IVS), provides the initial high-voltage boost to the input voltage. The output voltage is then regulated by the PWM control circuit, which generates high frequency pulses on the low side MOSFET.

The duty cycle of the pulses generated by the PWM control circuit determines the amount of duty cycle-controlled power delivered to the load from the output capacitor. The feedback circuit monitors the actual output voltage and adjusts the voltage setting accordingly. The LT3697EMSE#PBF is designed for constant current or constant voltage operation, allowing the user to easily switch between the two operating modes.

To further extend its versatility, the LT3697EMSE#PBF can also be used as a synchronous buck-boost converter, allowing it to boost or reduce the output voltage depending on the input voltage. This is done through the use of an external MOSFET to provide greater flexibility and efficiency.

To summarize, the LT3697EMSE#PBF synchronous buck regulator is a high performance and low input quiescent current solution which can safely and efficiently regulate a wide range of input voltages to a desired output voltage. Its integrated power MOSFETs, feedback and control circuit, and adjustable current and voltage makes it an excellent choice for a variety of DC-DC buck converter applications.

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