MCP1727-1202E/MF Application Field and Working Principle

The MCP1727-1202E/MF is a PMIC - Voltage Regulators - Linear integrated circuit from the Microchip family of linear regulators. It devices provide adjustable output, low-current shutdown, current-limiting protection, improved transient response, and low output noise. With a maximum output voltage of 12V and a typical dropout voltage of 1V, the MCP1727-1202E/MF is a good choice for providing a steady voltage source for a broad range of applications.

Features and Benefits

  • High Power Dissipation: 28 W typical, 30 W maximum.
  • Low Dropout Voltage: 0.9 V typical, 1.1 V maximum.
  • Low Output Noise: 0.2 mV RMS.
  • Rejection Ratio: 65 dB minimum, @ 10 kHz.
  • Reverse Battery Protection: True reverse battery protection.
  • Reverse Current Protection: Open drain to eliminate reverse current.
  • Thermal Shutdown: Robust thermal shutdown prevents device burnout.
  • Fast Transient Response: Combined 1.8V and 2.5V reference with improved transient response makes the MCP1727 ideal for powering low-noise applications.

Applications

The MCP1727-1202E/MF is a low-dropout linear regulator device specially designed for low-noise applications. The device’s excellent transient response, low dropout voltage, and low output noise make it suitable for powering sensitive analog and digital circuits, as well as other circuitry requiring low-noise operation. Examples of suitable applications include:

  • DVD Players
  • Cable/Satellite Boxes
  • Networking Switches
  • Telecommunications Equipment
  • Industrial Applications
  • Medical Applications
  • Power Supplies
  • Computer Peripherals
  • Automotive Applications

Working Principle

The MCP1727-1202E/MF voltage regulator is a linear regulator. It is designed to regulate an input voltage to a fixed output voltage, lower than the input voltage, using a series pass element that is energetically coupled to a feedback circuit within its package. The series pass element contains a P-channel MOSFET, along with a current limit feature, which provides a maximum amount of current available from the regulator. When the regulator is enabled, the output voltage will be equal to the voltage reference voltage (Vref).

The voltage reference voltage is set by an external resistor placed across the Vref and GND pins. Pull-up and pull-down resistors are used to set the output voltage of the regulator. The given values for the pull-up and pull-down resistors will determine the output voltage, along with the reference voltage. For example, if the voltage reference voltage is 2.5V and the pull-up/pull-down resistors used is 20K ohms, the output voltage would be 5V (2.5V x 2).

The MCP1727-1202E/MF is capable of providing up to 28W of power. The device\'s low current shutdown feature, current-limiting protection, improved transient response, and low output noise make it an ideal voltage regulator for low-noise applications.