NCP717BMX310TCG

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The NCP717BMX310TCG is a widely used integrated circuit (IC) from ON Semiconductor, which belongs to the family of Linear PMIC - Voltage Regulators. This IC is a low-dropout (LDO) voltage regulator that is specifically designed to provide fixed 3.3V output under various operating conditions with a maximum input voltage of 6.5V and a maximum output current of 0.3A. It is widely used in applications such as microcontroller power supplies, point-of-load applications, automotive DC-DC converters, and etc.

Features

• Low current limit
• Low dropout voltage
• Output voltage accuracy of +/-2%.
• Very low Quiescent current (13uA)
• Short-Circuit and Overload protection
• High power-supply rejection ratio (PSRR) of 68dB.
• Low temperature coefficient (Tc=+0.03%)

Applications

• Microcontroller power supplies
• Point-of-load applications
• Automotive DC-DC converters
• Auto telecom power supplies
• Battery powered systems
• Portable consumer electronics
• Audio equipment
• LED lighting systems

Working Principle

The NCP717BMX310TCG is a voltage regulator that uses a PNP transistor to regulate the output voltage. Internally, the NCP717BMX310TCG also has a zener diode, resistors and capacitors to control and stabilize the output voltage, as well as to ensure over-current and over-voltage protection. The PNP transistor acts as a current source in the circuit, and is controlled by an internal voltage sensing circuit, which is compensated to ensure accuracy at varying temperatures.

When the input voltage drops below the output voltage, the internal zener diode is powered and its voltage is used to drive the PNP current source, which pulls current from the output node and thereby maintains the regulated voltage at the output. If the input voltage rises above the output voltage, the internal circuit pulls current from the output node and prevents the voltage from rising.

When the external load current increases, the voltage at the output nodes drops due to the resistance between the current source and the load. This drop in voltage can be seen in the negative feedback loop of the circuit, which then adjusts the current source voltage to maintain the output voltage across the load.

Overall, the NCP717BMX310TCG is able to regulate the output voltage to the desired level with a maximum load current of 0.3A, and is also able to provide an output voltage accuracy of +/-2%.

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