LT3757HMSE#PBF

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LT3757HMSE#PBF is an integrated switch-mode, high-efficiency, high speed, buck/boost regulator and current-mode switching power supply controller. It is designed to provide multiple operating modes to minimize system components, by combining the simplicity of a buck converter and the flexibility of a booster circuit. It contains all the required building blocks including an internal oscillator with frequency adjustment, internal compared to regulate output voltage, and 3x Delta-Sigma modulators.

As a PMIC (Power Management IC) in the Voltage Regulators – DC DC Switching Controllers series, the LT3757HMSE#PBF is suitable for applications that require a wide input voltage range and high efficiency. It can operate from input voltage rails ranging from 0.8V to 36V and a wide range of output voltage rails from 0.8V to 32V. Operating frequency for this device is up to 600kHz, allowing for small external components, higher efficiency, and high speed performance.

The working principle for the LT3757HMSE#PBF can be best explained with a simplified example. Assuming a buck/boost converter is used, the working principle is as follows: The input voltage acts as the driver of the outputs voltage of the device. As the input voltage varies, the buck/boost regulator adjusts its operating mode and output voltage accordingly. Higher input voltage will cause the device to enter into boost mode, while lower input voltage will cause it to enter buck mode. An internal compared adjusts the regulating voltage to maintain the desired nominal output voltage.

In addition, LT3757HMSE#PBF utilizes its internal oscillator to regulate the operating frequency of the All-Mode Converter. This oscillator also ensures that the switching frequency is kept stable, as input voltages can vary while output voltages stay constant. The oscillator can also be synchronized to an external signal up to 600kHz. An integrated 3x Delta-Sigma modulator allows for more efficient implementation of the switching power supply, transforming the input signal into the switching signal of the power switch to minimize unwanted harmonics.

Overall, the LT3757HMSE#PBF is a highly integrated switch-mode advanced power supply that can be used in a wide variety of applications that require both wide input/output voltage ranges, as well as high efficiency and speed. Its combination of all the required building blocks makes it an effective and reliable solution for DC-DC power conversion.

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