The model "NCP1117LPST33T3G" is a part of ON Semiconductor. It is a Low Dropout Regulator (LDO) with a fixed output voltage of 3.3V.
Package and Pinout:
The NCP1117LPST33T3G typically comes in the SOT-223 package, which has 4 pins. Below is a detailed pin function description.
Pinout and Pin Functions for NCP1117LPST33T3G (SOT-223 Package):
Pin Pin Name Function Description 1 Input (IN) The input pin, where the input voltage is supplied. This is where the power source is connected, and it is typically in the range of 5V to 15V. 2 Ground (GND) The ground pin, where the system ground is connected. It provides the reference for the output voltage. 3 Output (OUT) The output pin, which provides a regulated 3.3V output voltage. This is the pin where the load (e.g., microcontroller or sensors) is powered from. 4 Adjustment (ADJ) The adjustment pin is used to set the output voltage in variable versions of the LDO. For the fixed 3.3V version, this pin is typically left open or grounded.Circuit Principle:
The NCP1117LPST33T3G operates as a Low Dropout Regulator (LDO). The regulator adjusts the voltage at the output pin (OUT) to maintain a stable 3.3V, as long as the input voltage (IN) is higher than the output by at least the dropout voltage, typically around 1.1V for this part. The regulator's performance can be influenced by the values of the input capacitor , output capacitor, and load current.
FAQ:
1. What is the input voltage range for NCP1117LPST33T3G? Answer: The input voltage range for NCP1117LPST33T3G is typically between 5V to 15V.
2. What is the output voltage of the NCP1117LPST33T3G? Answer: The output voltage is a fixed 3.3V.
3. Can I use the NCP1117LPST33T3G for 12V systems? Answer: Yes, the NCP1117LPST33T3G can be used in systems where the input voltage is as high as 12V, as long as the input voltage is higher than 3.3V by at least the dropout voltage.
4. What is the dropout voltage of the NCP1117LPST33T3G? Answer: The typical dropout voltage is around 1.1V.
5. Is the NCP1117LPST33T3G thermally protected? Answer: Yes, the NCP1117LPST33T3G has thermal overload protection, which helps prevent damage in case the chip gets too hot.
6. What is the maximum output current of NCP1117LPST33T3G? Answer: The NCP1117LPST33T3G can deliver a maximum output current of 800mA.
7. Can I use the NCP1117LPST33T3G without external capacitors? Answer: It is recommended to use external capacitors for stable operation. Typically, a 10µF capacitor on the output and a 1µF capacitor on the input are recommended.
8. What type of capacitors should I use for NCP1117LPST33T3G? Answer: Ceramic or tantalum capacitors are typically used for input and output.
9. Can I use the NCP1117LPST33T3G in a 5V system? Answer: Yes, the NCP1117LPST33T3G can be used to step down 5V to 3.3V.
10. What is the typical quiescent current of NCP1117LPST33T3G? Answer: The typical quiescent current is 5mA.
11. What is the maximum output voltage tolerance for NCP1117LPST33T3G? Answer: The typical output voltage tolerance is ±2%, meaning the output is expected to stay within 3.3V ± 0.066V.
12. Can NCP1117LPST33T3G be used for powering microcontrollers? Answer: Yes, the NCP1117LPST33T3G is ideal for powering 3.3V microcontrollers.
13. Is the NCP1117LPST33T3G available in other output voltage versions? Answer: Yes, the NCP1117 is available in multiple output voltage versions, including 1.8V, 2.5V, 3.3V, and 5V.
14. What is the maximum power dissipation of the NCP1117LPST33T3G? Answer: The power dissipation is determined by the input-output voltage difference and output current. For instance, if the input is 5V and the output is 3.3V, the power dissipated is calculated by the formula ( P = (V{IN} - V{OUT}) \times I_{OUT} ).
15. Can I use the NCP1117LPST33T3G in automotive applications? Answer: Yes, as long as the input voltage is within the specified range, it can be used in automotive systems.
16. Does the NCP1117LPST33T3G require heat sinking? Answer: Depending on the input-output voltage difference and the output current, a heat sink might be required to keep the regulator from overheating.
17. What is the typical size of the SOT-223 package? Answer: The SOT-223 package is typically 4.5mm x 6.5mm.
18. Is the NCP1117LPST33T3G suitable for battery-powered devices? Answer: Yes, the low dropout voltage makes it suitable for battery-powered systems.
19. What are the common applications of the NCP1117LPST33T3G? Answer: Common applications include powering microcontrollers, sensors, and other 3.3V logic circuits in embedded systems.
20. Can the NCP1117LPST33T3G be used for high-power applications? Answer: The NCP1117LPST33T3G is suitable for low to moderate power applications. For high-power needs, a more powerful LDO or buck converter is recommended.