NCP1117ST33T3G Detailed explanation of pin function specifications and circuit principle instructions

The model "NCP1117ST33T3G" is part of ON Semiconductor's family of low dropout regulators (LDOs), specifically designed for providing stable and reliable output voltage in various electronic circuits.

Package Type:

NCP1117ST33T3G typically comes in a SOT-223 package. It has 3 pins, which are the most common for this voltage regulator family.

Pin Function Specifications (SOT-223 Package, 3 Pins):

Here is the detailed explanation of the pin functions for the NCP1117ST33T3G in the SOT-223 package.

Pin Number Pin Name Pin Function Description 1 Input (IN) The Input pin (Pin 1) is connected to the supply voltage that will be regulated. The voltage at this pin must always be higher than the desired output voltage by at least the dropout voltage. This pin is typically connected to the positive Power rail (e.g., 5V, 12V). 2 Ground (GND) The Ground pin (Pin 2) provides the reference voltage for the regulator. It is usually connected to the common ground of the circuit. This pin serves as the return path for current from the output and input. 3 Output (OUT) The Output pin (Pin 3) provides the regulated output voltage (3.3V in the case of NCP1117ST33T3G). This voltage is stable and is used to power downstream components. It must be connected to the load or the circuit that requires the regulated voltage.

Circuit Principle Overview:

The NCP1117ST33T3G is a low dropout regulator (LDO) designed to provide a stable output voltage with a small difference between the input and output voltage. It is particularly useful in situations where the input voltage is only slightly higher than the desired output voltage.

Input Voltage: This LDO can accept a range of input voltages, typically from 4.75V to 15V, with the output being regulated to 3.3V. Output Voltage: The fixed output voltage is 3.3V, which is ideal for low-power digital circuits and other components requiring a stable 3.3V supply. Dropout Voltage: The dropout voltage of the NCP1117ST33T3G is typically around 1.1V at 800mA output current, meaning the input voltage must be at least 1.1V higher than the output voltage to maintain regulation. Current Capability: It can supply output currents up to 800mA.

Frequently Asked Questions (FAQ):

1. What is the full name of NCP1117ST33T3G? The full name is NCP1117ST33T3G, a low dropout voltage regulator from ON Semiconductor. 2. What is the output voltage of NCP1117ST33T3G? The output voltage is 3.3V. 3. What is the maximum output current of NCP1117ST33T3G? The maximum output current is 800mA. 4. What is the input voltage range for NCP1117ST33T3G? The input voltage range is typically 4.75V to 15V. 5. What is the dropout voltage for NCP1117ST33T3G? The typical dropout voltage is 1.1V at 800mA output current. 6. What is the SOT-223 package used for NCP1117ST33T3G? The SOT-223 package is used, which is a 3-pin package. 7. How should I connect the Input pin of NCP1117ST33T3G? The Input pin (Pin 1) should be connected to the supply voltage source that is higher than the regulated output voltage. 8. What is the function of the Ground pin on NCP1117ST33T3G? The Ground pin (Pin 2) should be connected to the common ground of your circuit. 9. How should I connect the Output pin of NCP1117ST33T3G? The Output pin (Pin 3) should be connected to the load or the circuit that needs the regulated 3.3V output. 10. Can NCP1117ST33T3G be used in battery-powered applications? Yes, NCP1117ST33T3G can be used in battery-powered applications because of its low dropout voltage. 11. What is the power dissipation of the NCP1117ST33T3G? The power dissipation is calculated based on the voltage difference between input and output multiplied by the current. Power dissipation = (Vin - Vout) * I_out. 12. How do I choose the right input voltage for NCP1117ST33T3G? Choose an input voltage that is at least 1.1V higher than the desired output voltage to ensure proper regulation, considering the dropout voltage. 13. What is the thermal shutdown of the NCP1117ST33T3G? The NCP1117ST33T3G has a built-in thermal shutdown feature that protects the regulator from overheating, typically triggering at around 150°C. 14. Does NCP1117ST33T3G have overcurrent protection? Yes, it has overcurrent protection that will limit the output current to protect the device and the circuit. 15. What is the typical application of NCP1117ST33T3G? It is commonly used in low-power circuits, battery-powered devices, and digital systems requiring a stable 3.3V supply. 16. How do I improve the output voltage stability? Use a capacitor at the input and output pins as recommended in the datasheet (typically 10uF on both sides). 17. Can NCP1117ST33T3G be used for high-power applications? No, the NCP1117ST33T3G is better suited for low-power applications. For higher current applications, consider other LDO regulators with higher current ratings. 18. What is the recommended capacitor for NCP1117ST33T3G? Typically, a 10uF ceramic capacitor is recommended at both the input and output pins for stability. 19. Is NCP1117ST33T3G suitable for automotive use? It can be used in automotive applications as long as the input voltage stays within the recommended range and temperature conditions are met. 20. How to handle the NCP1117ST33T3G to avoid damage? Always ensure proper thermal management and avoid applying excessive voltages at the input and output. Ensure the correct polarity for connections.

Conclusion:

This detailed explanation covers the pin functions and specifications of NCP1117ST33T3G in a SOT-223 package, along with common usage scenarios and answers to frequently asked questions.