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LT3957AEUHE#PBF Application Field and Working Principle

The LT3957EUHE#PBF is a type of DC/DC switching regulator from Linear Technology, which belongs to the Power Management and Control IC family. It is classified as a PMIC (Power Management IC), Voltage Regulators, and DC/DC Switching Regulators. This device provides a constant voltage output of 5V (±1.3%), with an adjustable output voltage range of 3 to 40V. It is designed to deliver up to 40V in a very small package and comes with a buck current limit feature.

Application Fields

The LT3957AEUHE#PBF is suitable for various applications, ranging from post-regulation tracking, automotive, industrial and medical power supplies. Its small size and high efficiency makes it an ideal choice for applications where minimal external components are required, such as power management and control, automotive, industrial and medical settings. It can also be used in other types of applications such as solar power supply systems, power amplifiers, power converters, power factor correction and voltage regulation.

Working Principle

The LT3957AEUHE#PBF works through a simple buck-boost mechanism, where it steps down and steps up the voltage at the same time and supplies an optimal voltage output to the load. This is accomplished through an internal boost and buck regulators that are connected in series with an external pass element. The boost regulator is designed to raise the input voltage while the buck regulator works to reduce it. The output voltage is then achieved by adjusting the duty-cycle of the input voltage using an error amplifier and a control circuit. The current limit circuitry is also implemented to protect both the regulator and the load by limiting the maximum available output current. With this simple but powerful internal architecture, the LT3957AEUHE#PBF is able to provide highly efficient voltage regulation up to 40V in a very small package.

Conclusion

The LT3957AEUHE#PBF is a DC/DC switching regulator from Linear Technology, which provides a constant voltage output with adjustable output voltage range of 3 to 40V in an ultra-small package. This device is suitable for various applications, from post-regulation tracking, automotive, industrial and medical power supplies, to solar power supply systems, power amplifiers, power converters, power factor correction and voltage regulation. It works through a simple buck-boost mechanism, where it steps down and steps up the voltage while supplies a highly efficient and optimal voltage output. With the built-in current limit circuitry, the LT3957AEUHE#PBF is able to protect both the regulator and the load by limiting the maximum available output current.

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