TPS74801RGWR Detailed explanation of pin function specifications and circuit principle instructions

The part number you mentioned, "TPS74801RGWR," refers to a specific product from Texas Instruments. Below is a detailed explanation of the pin function specifications, circuit principle instructions, and the requested table format for all pin functions and FAQ section.

Pin Function Specifications and Circuit Principle Instructions

The TPS74801RGWR is a low-dropout (LDO) regulator with an adjustable output voltage designed by Texas Instruments. This device is used to regulate voltage in power supplies, particularly where space is limited and a low dropout voltage is necessary.

Pin Count and Package Package Type: WQFN (Wettable Flank) Pin Count: 6 pins Pin Pitch: 0.5 mm Package: 6-pin WQFN package Pin Function Description

Here is the pin description for the TPS74801RGWR. The device has 6 pins in total:

Pin No. Pin Name Pin Type Pin Function Description 1 VIN Input Input Voltage: This is the input pin where the supply voltage is applied. The voltage range typically ranges from 2.5V to 6V. 2 GND Ground Ground Pin: Connects to the system ground. This is the reference for all voltages in the circuit. 3 EN Input Enable Pin: This pin is used to turn the regulator on or off. A logic high (typically 2V to 5V) will turn the device on. A logic low will disable the regulator, resulting in zero output voltage. 4 VOUT Output Output Voltage: This is the regulated output voltage pin. The output voltage can be adjusted using external resistors to set the desired value. 5 FB Input Feedback Pin: This pin is used to set the output voltage in an adjustable version of the LDO regulator. An external resistor divider is connected here. 6 NC No Connect No Connect: This pin is not connected to any internal circuitry and can be left floating or connected to ground.

Circuit Principle

The TPS74801RGWR works by regulating the voltage difference between the input voltage (VIN) and output voltage (VOUT) to maintain a stable output. This is achieved using an internal feedback loop where the feedback pin (FB) senses the output voltage and adjusts the regulator’s internal circuitry to maintain the desired value.

Input voltage is applied to the VIN pin and must be within the device's specified range. The enable (EN) pin controls the power state of the device. The feedback (FB) pin senses the output voltage and adjusts it according to the external resistor divider network connected between the VOUT and FB pins. The regulated output is provided at the VOUT pin.

20 FAQs for the TPS74801RGWR

1. What is the input voltage range for the TPS74801RGWR?

The input voltage range for the TPS74801RGWR is from 2.5V to 6V.

2. What is the output voltage range of the TPS74801RGWR?

The output voltage can be adjusted using external resistors and can typically range from 0.8V to 5V.

3. What is the purpose of the enable (EN) pin in the TPS74801RGWR?

The enable (EN) pin is used to enable or disable the regulator. A logic high turns the device on, and a logic low disables it.

4. How do I calculate the output voltage of the TPS74801RGWR?

The output voltage is set using a resistor divider network connected to the feedback (FB) pin. Use the formula ( V{OUT} = V{REF} \times (1 + \frac{R2}{R1}) ), where ( V_{REF} ) is the reference voltage (typically 0.8V).

5. What is the dropout voltage for the TPS74801RGWR?

The dropout voltage is typically 40mV at 200mA output current, which means it can maintain a regulated output voltage even with a very small voltage difference between the input and output.

6. Can the TPS74801RGWR be used for high-current applications?

No, the TPS74801RGWR is intended for low to moderate current applications. It typically supports up to 200mA of output current.

7. What is the maximum operating temperature for the TPS74801RGWR?

The maximum operating temperature for the TPS74801RGWR is 125°C.

8. Can the TPS74801RGWR be used for a 5V output?

Yes, the TPS74801RGWR can be configured to provide a 5V output by using the appropriate resistor divider on the feedback pin.

9. What is the pinout of the TPS74801RGWR?

The pinout consists of 6 pins: VIN (input), GND (ground), EN (enable), VOUT (output), FB (feedback), and NC (no connect).

10. Is the TPS74801RGWR internally protected?

Yes, the TPS74801RGWR includes built-in protection features such as thermal shutdown and current limit to protect the device from damage.

11. Can I use the TPS74801RGWR without a feedback resistor network?

No, for adjustable versions, the feedback resistor network is necessary to set the output voltage.

12. How does the TPS74801RGWR compare to other LDO regulators?

The TPS74801RGWR is notable for its ultra-low dropout voltage and small package, making it ideal for space-constrained, low-voltage applications.

13. Can the EN pin be left floating?

No, the EN pin should not be left floating. It should be driven either high or low for proper operation.

14. How do I turn off the TPS74801RGWR?

To turn off the TPS74801RGWR, pull the EN pin low.

15. What is the typical output noise for the TPS74801RGWR?

The output noise is typically low, but this will depend on the external capacitor s used in the application.

16. What types of capacitors should be used with the TPS74801RGWR?

The device typically requires low ESR (equivalent series resistance) ceramic capacitors on the input and output for stable operation.

17. Is there any thermal protection in the TPS74801RGWR?

Yes, the TPS74801RGWR includes thermal shutdown protection to prevent overheating.

18. What is the quiescent current of the TPS74801RGWR?

The quiescent current is typically very low, which helps improve efficiency in battery-powered applications.

19. How do I handle the NC pin?

The NC pin can be left unconnected, as it is not internally connected to any circuitry.

20. Can the TPS74801RGWR be used in automotive applications?

Yes, the TPS74801RGWR can be used in automotive applications, but make sure to validate the operating conditions, such as input voltage and temperature range, with your system specifications.

This summary should give you a thorough understanding of the TPS74801RGWR pin functions and specifications. If you need any further details, feel free to ask!