MCP1703AT-4002E/DB

PMIC (Power Management IC) is an integrated circuit (IC) that manages the power transistors of electronic systems. Voltage Regulators are PMIC that are responsible for controlling the output voltage to a predetermined level. Within Voltage Regulators electronic systems, there are both linear and switch-mode power supplies. The MCP1703AT-4002E/DB is a three-terminal linear voltage regulator designed for low voltage applications.

Application Field

The MCP1703AT-4002E/DB is a low dropout (LDO) regulator meant for portable applications that require low quiescent needs such as cell phones and hand-held electronics. This LDO has an output current of up to 500mA with an input voltage of 6V maximum and is capable of supplying ultra-low 0.2mA quiescent current. It is designed to provide a low noise output of 0.1% over line, load, and temperature. The extended operating temperature range encompasses -40 to 85 °C making it suitable for harsh environments.

Working Principle

In order to understand how the MCP1703AT-4002E/DB works, it is important to understand the three main stages of its operation. The first is the sensing stage, where the regulator monitors the output voltage feedback and compares it to an internal reference voltage. The second stage is the control stage, where the regulator responds to the difference in voltage by adjusting its output current. Finally, the third stage is the power stage, where the regulator will actually produce the desired output voltage.

The sensing stage is the first stage in the MCP1703AT-4002E/DB operation. In this stage the regulator uses two resistors to detect the difference between the regulated output voltage and the reference voltage. This difference is then used to adjust the current allowing the output voltage to reach the desired level.

The control stage is the second stage of the MCP1703AT-4002E/DB operation. In this stage, the regulator uses a finely tuned error amplifier to compare the actual output voltage and the reference voltage detected in the sensing stage. The error amplifier then adjusts the output current accordingly. This ensures that the output voltage remains at the desired level.

The power stage is the third and final stage of the MCP1703AT-4002E/DB operation. In this stage the regulator uses a power transistor to regulate the output voltage current based on the information received in the control stage. The power transistor provides the necessary amount of power to ensure the output voltage reaches the desired level.