MCP1825T-5002E/DC

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MCP1825T-5002E/DC Application Field and Working Principle

MCP1825T-5002E/DC is a small, linear voltage regulator from Microchip. It is categorized as a PMIC (Power Management Integrated Circuit) and is commonly used for embedded system power supplies and battery powered applications. The MCP1825T-5002E/DC offers voltage stabilizing capabilities with an intelligent solution for power management applications. This voltage regulator can provide an output of up to 500 mA and is offered in an industry standard 3-pin SOT-23 package.

Application Field

The MCP1825T-5002E/DC is designed for applications that require a DC voltage regulated from a current source, such as microcontrollers, analog and digital circuitry, LED drivers, and other portable battery applications. With its 500 mA output and low quiescent current, the regulator is well suited for portable and battery powered applications. Additionally, the MCP1825T-5002E/DC is designed for easy drop in replacement for applications requiring a linear voltage regulator, such as the ubiquitous 7805 regulator.

Working Principle

The MCP1825T-5002E/DC is an adjustable linear voltage regulator with a fixed 500 mA output. It is designed to provide a stable DC output voltage adjustable from 1.7V to 5.5V. The output voltage is controlled through an external control voltage applied on an external pin. The control voltage is limited by the linear regulator’s minimum output voltage, Vin and the maximum output voltage Vout.

Internally, the regulator consists of two identical power transistors connected in series. An internal current mirror is created, where the emitter currents of both transistors are matched at all times. This ensures that a constant output voltage is maintained, as the output of the regulator is directly proportional to the difference between the control voltage and the output voltage. As the output voltage increases, more current flows through the transistors, which in turn increases the base-emitter voltage, and thus the collector-emitter voltage of the output transistor.

The internal components of the regulator are protected from over-temperature and reverse breakdown. When the junction temperature exceeds a prescribed limit, the power transistors are shut down, preventing damage to the regulator. Additionally, the current mirror structure provides additional protection against reverse breakdown as it limits the current through the output transistor.

In summary, the MCP1825T-5002E/DC voltage regulator is a low power, low cost solution for embedded systems and battery powered applications. Its high output current and wide input voltage range make it ideal for a variety of applications. The current mirror structure and temperature protection provide additional safety and reliability.

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