The TPS79301DBVR is a voltage regulator from Texas Instruments (TI), specifically part of the TPS793 series. This series includes low dropout (LDO) regulators designed to provide a stable output voltage while maintaining low input-output voltage differentials, which is essential for many battery-powered or noise-sensitive applications.
Packaging and Pinout:
The TPS79301DBVR comes in a SOT-23-5 package, which is a small, surface-mount package that has 5 pins.
Detailed Pin Function Specifications:
Here is a detailed description of the 5 pins and their respective functions:
Pin Number Pin Name Pin Function 1 IN Input voltage: This is the pin where the input voltage is supplied to the regulator. The voltage must be higher than the output voltage by the dropout voltage for the regulator to function properly. The recommended operating voltage range is 1.4V to 5.5V. 2 GND Ground: This pin connects the regulator to the ground of the circuit. It is the reference for the input and output voltages. 3 OUT Output voltage: This pin provides the regulated output voltage. The TPS79301DBVR can output a fixed voltage of 3.0V. 4 NC No connection: This pin is not connected internally to any circuitry within the device. It can be left unconnected in the circuit. 5 FB Feedback: This pin is used for adjustable output voltage configurations, typically in more advanced variants of the series. For the fixed output version (TPS79301DBVR), this pin is internally connected to a voltage divider for regulation.Pin Function List (in Detail):
The TPS79301DBVR has 5 pins, and each pin serves a crucial role in the operation of the voltage regulator. Below is the breakdown:
Pin 1 - IN (Input) Pin: This is the input voltage pin. The voltage supplied to this pin must be higher than the output voltage by a specified dropout voltage (typically 40mV at 150mA load). It is important that the input voltage does not exceed the maximum voltage rating, which is typically 6V for this component. It should be decoupled with a capacitor close to the pin to stabilize input voltage fluctuations. Pin 2 - GND (Ground) Pin: The GND pin is the reference for both input and output voltages. It must be connected to the system's ground plane for proper operation. A low-impedance connection to ground is essential for the stability of the regulator. Pin 3 - OUT (Output) Pin: The OUT pin provides the regulated output voltage. In the case of TPS79301DBVR, this is a fixed 3.0V output. It is recommended to connect a capacitor close to the OUT pin to filter noise and provide stability under load conditions. Pin 4 - NC (No Connection) Pin: This pin is not connected to any internal circuitry in the IC. It can be left floating and has no function. Typically, no connection to this pin is required in a circuit design, and it does not affect performance. Pin 5 - FB (Feedback) Pin: This pin is used in the adjustable version of the TPS793 series to set the output voltage by connecting a resistive divider. For the fixed version (TPS79301DBVR), it is internally connected and does not require external components.Frequently Asked Questions (FAQ):
Here are 20 frequently asked questions (FAQ) about the TPS79301DBVR, which cover its operation, usage, and functionality:
Q: What is the input voltage range for the TPS79301DBVR? A: The input voltage for the TPS79301DBVR should be in the range of 1.4V to 5.5V. Q: What is the output voltage of the TPS79301DBVR? A: The output voltage of the TPS79301DBVR is a fixed 3.0V. Q: Can I use the TPS79301DBVR for higher output voltages? A: No, the TPS79301DBVR has a fixed 3.0V output. If you need adjustable output, you should use a different version of the TPS793 series. Q: What is the dropout voltage of the TPS79301DBVR? A: The dropout voltage of the TPS79301DBVR is typically 40mV at 150mA of load current. Q: How should I connect the GND pin in my circuit? A: The GND pin should be connected to the ground plane of your system for proper voltage reference. Q: Do I need to add capacitors to the input and output pins? A: Yes, decoupling capacitors are recommended at both the input and output to improve stability and reduce noise. Q: Is there a maximum input voltage for the TPS79301DBVR? A: Yes, the input voltage should not exceed 6V, as this is the maximum rating. Q: What is the current output capability of the TPS79301DBVR? A: The TPS79301DBVR can provide up to 150mA of output current. Q: What happens if the input voltage falls below the output voltage? A: If the input voltage falls below the output voltage by more than the dropout voltage, the regulator will no longer be able to maintain the output voltage.Q: Can I use the NC pin in my circuit?
A: No, the NC pin is not internally connected to any circuit, and it should be left floating.Q: What is the purpose of the FB pin?
A: The FB pin is used for adjustable versions of the TPS793 series to set the output voltage using an external resistive divider.Q: Is the TPS79301DBVR suitable for battery-powered applications?
A: Yes, due to its low dropout voltage, the TPS79301DBVR is well-suited for battery-powered systems where the input voltage is close to the desired output voltage.Q: How do I ensure stability in my design using the TPS79301DBVR?
A: Proper input and output capacitors should be used to maintain stability. Texas Instruments provides recommended capacitor values in the datasheet.Q: What type of capacitor should be used on the output?
A: A low ESR ceramic capacitor with a value of 1µF to 10µF is typically used on the output.Q: Can I use the TPS79301DBVR in parallel with another voltage regulator?
A: Parallel operation is not typically recommended for voltage regulators like the TPS79301DBVR due to current sharing issues.Q: Does the TPS79301DBVR have overcurrent protection?
A: Yes, the TPS79301DBVR includes built-in overcurrent protection to prevent damage in case of excessive load.Q: Can I use the TPS79301DBVR in high-frequency applications?
A: Yes, the TPS79301DBVR is capable of high-frequency operation, and using proper decoupling capacitors can help ensure stable operation at high frequencies.Q: Is there a thermal shutdown feature in the TPS79301DBVR?
A: Yes, the TPS79301DBVR includes thermal shutdown protection to prevent damage from overheating.Q: What is the typical efficiency of the TPS79301DBVR?
A: The TPS79301DBVR operates with a high efficiency typical of low-dropout regulators, especially at light loads where the efficiency is close to 100%.Q: Can the TPS79301DBVR be used in automotive applications?
A: Yes, as long as the input voltage remains within the specified range and proper protection against voltage spikes is provided.Summary:
The TPS79301DBVR is a compact, efficient LDO voltage regulator from Texas Instruments, ideal for low-power, portable, or noise-sensitive applications. It comes in a SOT-23-5 package and has 5 pins, each serving a specific function for providing a stable 3.0V output.
