MCP1703AT-1802E/MC

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PMIC as a type of voltage regulating device, is widely used in many industries such as consumer electronics, medical, automotive, and aerospace and military applications. Although there are different types of regulators such as switching, switching-integrated, or adjustable voltage regulators, the most popular type is linear voltage regulators. The MCP1703AT-1802E/MC is one of the widely used and recognised voltage regulating Linear Integrated Circuits (ICs). This application note will provide an overview of its application fields, working principle and design considerations.

The MCP1703AT-1802E/MC is a family of low-cost, high-performance, low-dropout (LDO) linear voltage regulators that can deliver a maximum output voltage of 8V with a typical quiescent current of 3 mA. These voltage regulators are designed to provide an extremely low dropout voltage, making them an ideal choice for applications where power supply ripple is critical or when powering high-precision components, such as in medical, automotive, or aerospace applications. Additionally, they offer excellent protection against reverse-voltage and over-voltage conditions, and have a range of output currents of up to 150 mA.

The MCP1703AT-1802E/MC is specifically designed to operate in ultra-low-voltage applications and support a wide input voltage range. The input voltage can range from 1.8 V and can be reduced as low as 0.7V to support single-cell Lithium-ion battery power systems. The step-up and down of output voltage is completed with two external resistors. This makes the circuit a “programmable” three-terminal voltage regulator.

The working principle of the MCP1703AT-1802E/MC is that of a programmable voltage regulator with voltage-level shifting. The voltage-level shifting is achieved by using two internal switching transistors that are used to step the input voltage up or down to the output voltage. The transistors can also be used to limit the current provided to the load. The voltage-level shifting is achieved through feedback mechanisms. In the case of the MCP1703AT-1802E/MC, feedback is provided through an external resistor divider network. This resistor divider network is used to set a predetermined voltage at the output to an externally applied reference voltage.

A pull-down transistor is used to ensure that the output of the MCP1703AT-1802E/MC is fully discharged. This transistor also provides an over-temperature protection circuit to guard against excessive heat. The MCP1703AT-1802E/MC also includes an internal start-up circuit that ensures the IC is properly initialized. The start-up circuit ensures the IC is in its correct operating state before starting its operations.

In order to use the MCP1703AT-1802E/MC most effectively, there are a few important design considerations that should be kept in mind. For example, the input voltage range should be chosen carefully as it affects the maximum output current the regulator can provide. It is also important to select the right supply stabilization capacitor. If the capacitor is too large, it can reduce the already low-noise performance of the MCP1703AT-1802E/MC. Additionally, the external resistor divider network should be designed carefully to prevent the voltage from exceeding the capabilities of the undervoltage lockout circuit. It is also important to not load the output of the regulator too heavily as this can cause oscillations that can damage the regulator.

The MCP1703AT-1802E/MC is a popular choice for a wide range of applications, such as medical equipment, electronic point-of-sale systems, portable electronic devices, and automotive applications. With its wide input voltage range, low dropout voltage, and protection functions, the MCP1703AT-1802E/MC is a well-rounded and reliable choice for many low-power applications. As long as these design considerations are kept in mind, the MCP1703AT-1802E/MC can provide many benefits to the products it is used in.

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