LM3674MF-1.875/NOPB

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The LM3674MF-1.875/NOPB is an integrated power switch with many power management capabilities. Acting as a high-efficiency, low-power, negative voltage regulator, It is designed as an offline, step-down or buck converter. It is a part of Texas Instruments’ family of Linear and Regulated Switching Voltage Regulators (RSVR).

The LM3674MF-1.875/NOPB comes with a wide range of input and output voltage options, allowing for a variety of configurations to meet the different power requirements of a variety of applications. The output voltage can be set using an external voltage divider network and is adjustable from -0.9 to -1.875V. For high output current applications, an external high-side N-channel MOSFET can also be used to improve efficiency.

A unique feature of the LM3674MF-1.875/NOPB is its ability to detect an overtemperature condition and then shut itself down upon detection of an overtemperature condition. The device also provides an adjustable current limit function to prevent device damage due to overloads.

The LM3674MF-1.875/NOPB is designed for use as a generic offline negative voltage regulator, with applications in digital power supplies, DC/DC converters, voltage sequence control circuits, and integrated power systems. It is ideal for switching power supply applications and provides the user with a highly flexible power solution for any project.

The LM3674MF-1.875/NOPB has an internal synchronous rectifier, allowing it to achieve high efficiency operation at low input voltages. In addition, the device features a high switching frequency, allowing it to operate even in noisy RF environments. The device also features a low-noise/low-ripple-startup feature that reduces audible noise at startup.

The working principle of the LM3674MF-1.875/NOPB follows the standard buck converter design. During operation, the power switch (the MOSFET) is turned on when the voltage at the output of the error amplifier is greater than the voltage across the current sense resistor. This voltage is called the current limit threshold voltage and is adjusted by adjusting the senses resistor value. When the power switch is on, the output voltage is regulated by the voltage divider at the output.

When the voltage across the power switch reaches the upper threshold, which is determined by the current sensing resistor, the power switch is turned off and the capacitor stores the charge. During the off period, the inductor discharges the energy stored in it, resulting in a decrease in output voltage. This cycle continues and is responsible for the regulation of output voltage.

By using the required components to create a negative voltage regulator, the LM3674MF-1.875/NOPB ensures reliable, robust operation that meets the durability, safety, and performance requirements of a wide range of applications. By utilizing the latest power technologies and adding extra features, the LM3674MF-1.875/NOPB can help reduce system costs and enhance performance.

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