MIC2937A-3.3BU TR

MIC2937A-3.3BU TR: Application Field and Working Principle

The MIC2937A-3.3BU TR is a Low Dropout (LDO) Voltage Regulator from Micrel that offers adjustable voltage output. It is a member of the linear voltage regulator family which offers adjustable, current-limited, and small size solutions for applications like voltage conversion and logic regulation.

The MIC2937A-3.3BU TR is an adjustable linear regulator, with a typical dropout voltage of 450mV. It offers a wide voltage range of 3.3V to 17V, allowing flexibility in different application requirements. Its low dropout and small size make it suitable for many space-constrained designs. Its adjustable output pin allows the user to select the voltage they need, while the regular pin sets the current limit. This way, the user can rely on the regulator even in unstable input or output conditions.

The MIC2937A-3.3BU TR is also designed to handle transient load currents with a typical response time of 7ns, allowing fast dynamic response for quick recovery from transients and power supply surges. Additionally, it is built with an over-current protection circuit, which monitors the circuit against excessive currents and shuts the whole regulator in case of an irregular voltage or current. This makes the MIC2937A-3.3BU TR an excellent choice for many applications.

Working Principle

The MIC2937A-3.3BU TR works by the voltage difference between its two inputs. The two inputs are the regulated and adjustable pins. The regulated pin is connected to the input voltage, while the adjustable pin sets the voltage for the desired with a simple voltage divider circuit. The regulator then compares these two voltages and, depending on the difference, adjusts the output voltage to match the input. This operation is repeated hundreds of times a second, to ensure the output voltage is always stable.

The regulator also has an overload protection circuit, which monitors the output current to make sure it does not exceed the specified limits. This makes the regulator more robust against over-current events and helps prevent the circuit from damage due to excessive current.

Applications

The MIC2937A-3.3BU TR is designed for a wide variety of applications, including:

• Voltage Conversion - Use the regulator to step down one voltage to another (e.g. 5V to 3.3V).
• Logic Regulation - Use the MIC2937A-3.3BU TR to power a logic circuit, providing a stable supply voltage no matter what the input voltage is.
• High Current Regulation - Use the MIC2937A-3.3BU TR to supply high current devices, such as motors and LED drivers.