The part number TPS74401RGW R corresponds to a specific component from Texas Instruments (TI). This part is a DC-DC converter (specifically a buck regulator) in a QFN-32 package. Below is the detailed explanation of the pin functions, the circuit principle, the full pinout specification, and a FAQ section based on the part number TPS74401RGWR.
Package Type:
QFN-32 Package (32 pins)Pin Function Description:
Pin Number Pin Name Function Description 1 VIN Input Voltage: Connects to the input supply voltage. The operating input voltage range is typically from 4.5V to 15V. 2 EN Enable: Enables or disables the output voltage regulation when pulled high or low, respectively. 3 VOUT Output Voltage: This pin provides the regulated output voltage from the DC-DC converter. 4 FB Feedback: This is the feedback pin that regulates the output voltage by comparing the feedback voltage with the reference voltage. 5 SW Switching Node: This is the node for the internal switching transistor s. It connects to an external inductor. 6 GND Ground: This pin is the reference ground for the device. 7 PGND Power Ground: This is the ground for the power section of the regulator. 8 VOUT Output Voltage: A secondary output voltage pin, if required. 9 COMP Compensation: Used to provide compensation for the control loop in the DC-DC converter. 10 FREQ Frequency: This pin is used to set the switching frequency by connecting an external resistor or capacitor . 11 N/C No Connection: This pin is not connected internally. 12 NC No Connection: Another no connection pin, providing design flexibility. 13 SS Soft-Start: Connects a capacitor to set the rate at which the device ramps up the output voltage during startup. 14 PGOOD Power Good: This pin indicates whether the output voltage is within the valid range. High indicates good output. 15 PVIN Power Input: Another input pin that connects to the input supply, specifically for the power section. 16 POUT Power Output: A secondary power output if multiple outputs are used. 17 NC No Connection: Unused pin for design flexibility. 18 NC No Connection: Another unconnected pin for design flexibility. 19 NC No Connection: Pin unused in the design. 20 NC No Connection: Pin unused for specific designs. 21 NC No Connection: Unused pin, typical for future design flexibility. 22 NC No Connection: Another unused pin. 23 NC No Connection: Unused pin. 24 NC No Connection: Unconnected pin for design flexibility. 25 NC No Connection: Pin left unconnected. 26 NC No Connection: This pin has no electrical connection internally. 27 NC No Connection: Unused pin, providing design flexibility. 28 NC No Connection: Another unconnected pin. 29 NC No Connection: Unused pin in the design. 30 NC No Connection: This pin has no internal connection. 31 NC No Connection: Pin not used in this configuration. 32 NC No Connection: Unused pin for design purposes.Circuit Principle:
The TPS74401RGWR is a buck converter, which is a type of DC-DC switching regulator that efficiently steps down an input voltage to a lower output voltage. Here's a simplified explanation of the circuit principle:
Input Voltage (VIN): The input voltage is applied to the VIN pin, typically ranging from 4.5V to 15V. Inductor and Switching: The regulator uses a high-speed switch (typically a MOSFET) at the SW pin. The inductor and the switching node regulate the current through the inductor. Feedback Loop: The FB pin provides feedback from the output voltage to compare it with an internal reference. This keeps the output voltage stable. Output Voltage (VOUT): The regulator outputs a stable, regulated voltage at the VOUT pin. Power Good (PGOOD): The PGOOD pin indicates if the output voltage is within the desired range.Frequently Asked Questions (FAQ):
Q: What is the input voltage range for TPS74401RGWR? A: The input voltage range for the TPS74401RGWR is between 4.5V and 15V.
Q: How do I enable the TPS74401RGWR? A: The TPS74401RGWR is enabled by applying a high voltage to the EN pin.
Q: How do I disable the TPS74401RGWR? A: To disable the TPS74401RGWR, pull the EN pin low.
Q: What is the output voltage of the TPS74401RGWR? A: The output voltage is set by the feedback loop and can be configured using external resistors.
Q: How can I adjust the switching frequency of the TPS74401RGWR? A: The switching frequency can be adjusted by connecting an external resistor to the FREQ pin.
**Q: What does the *PGOOD* pin indicate?** A: The PGOOD pin indicates if the output voltage is within the acceptable range, with a high output indicating good power.
**Q: Can I use the *SS* pin to control the startup behavior?** A: Yes, by connecting a capacitor to the SS pin, you can control the soft-start behavior of the TPS74401RGWR.
**Q: What is the function of the *FB* pin?** A: The FB pin is the feedback input that ensures the output voltage is regulated correctly by comparing it with the reference voltage.
**Q: Can I use the *VOUT* pin for multiple outputs?** A: Yes, the VOUT pin provides a regulated output voltage and can be used in multiple-output configurations.
Q: What is the maximum switching frequency of the TPS74401RGWR? A: The maximum switching frequency for the TPS74401RGWR is typically 1MHz.
**Q: What is the significance of the *SW* pin?** A: The SW pin is the switching node where the internal MOSFET switches the current through the inductor.
Q: Can I use a different inductor with the TPS74401RGWR? A: Yes, you can use an inductor with a value that matches the design specifications for proper operation.
Q: What is the power supply range for the TPS74401RGWR? A: The power supply range is between 4.5V and 15V at the VIN pin.
**Q: What type of capacitor should be used with the *SS* pin?** A: A capacitor in the range of 10nF to 100nF is typically used for the SS pin to set the soft-start time.
**Q: How do I connect the *GND* pin?** A: The GND pin should be connected to the ground plane of the circuit.
**Q: What happens if I do not connect the *VOUT* pin?** A: The output voltage cannot be delivered to the load if the VOUT pin is not connected correctly.
**Q: Can I use the *FREQ* pin for other purposes?** A: The FREQ pin should only be used for frequency control. Do not repurpose it.
Q: How can I monitor the output voltage? A: You can monitor the output voltage at the VOUT pin.
Q: Is the TPS74401RGWR thermal-shutdown protected? A: Yes, the TPS74401RGWR includes thermal shutdown protection to prevent overheating.
Q: What is the output current capability of the TPS74401RGWR? A: The output current capability depends on the design but can typically supply up to 1.5A of current.
This document provides the requested detail on the pin functions, packaging, and FAQs for the TPS74401RGWR device from Texas Instruments.