LM2575HVT-3.3

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The LM2575HVT-3.3 is a member of the popular LM2575 family of voltage regulator from Texas Instruments. This device is a highly efficient, monolithic, step-down switch regulator specifically designed for powering low voltage applications, like microcontrollers, DSPs, and ASICs. Furthermore, its wide input voltage range allows it to be used in a variety of applications.

The LM2575HVT-3.3 combines an internal power switch and control circuitry that allows operation over a wide input voltage range – from 4.5 V to 40 V. This unique design minimizes the external components necessary to manufacture the application and helps improve reliability. The LM2575HVT-3.3 also incorporates a low drop-out (LDO) architecture which allows for conversion at voltages as low as 0.5 V, making it optimized for battery powered systems.

The device’s PMOS power switch is capable of delivering up to 3A of output current with a very high efficiency; up to 95% for some cases. This high efficiency combined with its small size, fast transient response time and low output ripple make it ideal for powering low voltage applications.

The working principle of the LM2575HVT-3.3 is quite simple. As far as operation is concerned, the voltage regulator is driven by the output voltage. Upon powering up, the device starts in shutdown mode. This is achieved by a signal at the enable pin, which forces the P-channel MOSFET inside the voltage regulator open. The output voltage is then slowly raised until it reaches the regulation set point which is determined by the resistive divider across the feedback pins.

While in operation, the voltage at the feedback pins is continuously monitored and compared to a reference voltage. Depending on the feedback signal, the output is either increased or decreased to maintain a steady output voltage. The voltage regulator has an adjustable switching frequency of up to 450 kHz which allows for a very fast transient response time.

In addition to its excellent performance, the LM2575HVT-3.3 also has a number of features that make it suitable for many different applications. These features include an enable function with startup sequencing, an internal soft-start circuit, current limit, adjustable voltage ramp rate and frequency, and thermal shutdown. Furthermore, the option of a low noise version is also available.

The LM2575HVT-3.3 is a versatile and reliable voltage regulator that can be used in a variety of applications, including automotive, industrial, and consumer applications. Thanks to its patented PMOS design, its wide input voltage range, high efficiency and small size, this voltage regulator is an ideal choice for powering low voltage applications.

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