TPS2553DDBVR Detailed explanation of pin function specifications and circuit principle instructions
The "TPS2553DDBVR" is a part number from Texas Instruments (TI). It is a current-limiting Power distribution switch designed to protect against overcurrent conditions. The device operates by providing precise current limiting, making it useful in USB or similar applications for managing power distribution to different components while ensuring protection for sensitive electronics.
Package and Pin Function Specification
The TPS2553DDBVR comes in a QFN-16 package, meaning it has 16 pins. The following is a detailed description of each of the 16 pins, their functions, and usage instructions:
Pin Number Pin Name Pin Function Description 1 IN Input voltage pin (V_IN). Connect to the source voltage (e.g., 5V) for the power distribution. 2 GND Ground pin. Connect to system ground for proper operation. 3 OUT Output voltage pin (V_OUT). Connect to the load that needs power distribution. 4 VDD Power supply for the internal circuitry. Connect to a positive voltage supply (e.g., 3.3V or 5V). 5 ILIM Current limit setting. Connect a resistor to set the current limit threshold for the device. 6 FAULT Fault indication pin. This pin will indicate fault conditions such as overcurrent or thermal shutdown. 7 ENABLE Enable pin. Drive this pin high to enable the power switch, or low to disable it. 8 VDD Power supply for internal logic. Same as Pin 4 (VDD). 9 GND Ground pin. Same as Pin 2 (GND). 10 THERM Thermal status pin. Provides an indication of thermal shutdown or over-temperature conditions. 11 IMON Current monitoring output. Connect a resistor to measure the output current. 12 VOUT Output voltage monitoring pin. Connect this to an external ADC or other monitoring system. 13 NC No connection pin. This pin is not used and should be left unconnected. 14 NC No connection pin. Same as Pin 13 (NC). 15 NC No connection pin. Same as Pin 13 and Pin 14 (NC). 16 OUT Output voltage pin. Same as Pin 3 (OUT).Circuit Principle
The TPS2553DDBVR functions as a current-limiting power switch. When power is supplied to the device, it limits the amount of current that can flow to the load. This is achieved through the current sensing circuitry integrated into the device. The device also includes thermal and fault protection features to ensure safe operation.
Current Limiting: The current limit is set by an external resistor (connected to the ILIM pin). When the output current exceeds the set limit, the device will reduce the current to a safe level, preventing damage to the load and the device itself. Thermal Protection: The TPS2553DDBVR includes a thermal sensor. If the internal temperature of the device exceeds a safe threshold, it will shut down to prevent overheating. This status is reflected on the FAULT pin. Overcurrent and Fault Indication: The FAULT pin is used to indicate if the device has entered an overcurrent condition or has been thermally shut down. Enabling the Switch: The device is enabled or disabled using the ENABLE pin. If the ENABLE pin is high, the power switch is on, and power flows to the load. If it is low, the switch is turned off, and no power is supplied.20 FAQs (Frequently Asked Questions)
1. What is the TPS2553DDBVR used for? The TPS2553DDBVR is a current-limiting power distribution switch used to provide protection against overcurrent and thermal shutdown conditions in power distribution applications, particularly in USB devices. 2. How does the current limiting function work? The current limit is set by an external resistor connected to the ILIM pin. If the output current exceeds the threshold, the device will reduce the current flow to a safe level. 3. Can the output current be adjusted? Yes, the output current limit can be adjusted by changing the value of the resistor connected to the ILIM pin. 4. What happens when the device enters thermal shutdown? If the TPS2553DDBVR overheats, it will automatically shut down to protect itself. This condition is indicated on the FAULT pin. 5. How can I monitor the output current? The IMON pin can be used to monitor the output current by connecting a resistor. 6. **What does the *FAULT* pin indicate?** The FAULT pin indicates if there is a fault condition, such as overcurrent or thermal shutdown. 7. Can I disable the power switch? Yes, you can disable the power switch by driving the ENABLE pin low. 8. **What is the purpose of the *VDD* pin?** The VDD pin provides power to the internal circuitry of the TPS2553DDBVR. It must be connected to a voltage supply (e.g., 3.3V or 5V). 9. **How should I connect the *VOUT* pin?** The VOUT pin is connected to the load that requires power. It supplies the output voltage to the load. 10. **What is the function of the *THERM* pin?** The THERM pin provides a status of the device's thermal condition. If the device is overheating, it will trigger a thermal shutdown. 11. **What does the *ENABLE* pin do?** The ENABLE pin controls the operation of the power switch. Driving it high enables the switch, and driving it low disables it. 12. How many pins does the TPS2553DDBVR have? The TPS2553DDBVR has 16 pins in total, all with specific functions, including current limit setting, monitoring, and fault indication. 13. **Is the *IMON* pin necessary for normal operation?** The IMON pin is optional and used primarily for current monitoring. It is not required for basic operation of the power distribution switch. 14. Can the TPS2553DDBVR be used in high-power applications? The TPS2553DDBVR is designed for medium-power applications, typically for USB and similar systems that require overcurrent protection. 15. How do I set the current limit value? The current limit value is set by connecting a resistor to the ILIM pin. The resistor value determines the threshold at which the device will limit the output current. 16. What happens when the current exceeds the limit? If the current exceeds the set limit, the device will reduce the output current to a safe level, preventing damage to both the load and the device. 17. **What is the *NC* pin used for?** The NC pins (Pins 13-15) are not connected to anything internally and should be left unconnected. 18. Can I use the TPS2553DDBVR in a 3.3V system? Yes, the TPS2553DDBVR can operate with a 3.3V supply voltage. Ensure that the VDD pin is connected to a 3.3V supply. 19. What is the typical application for the TPS2553DDBVR? Typical applications include USB power distribution, battery-powered devices, and other systems requiring current-limiting and overcurrent protection. 20. How do I know if the TPS2553DDBVR is working correctly? You can check the FAULT pin for error conditions. If the pin is high, there may be an overcurrent or thermal fault.Conclusion
The TPS2553DDBVR from Texas Instruments is an essential component for providing power distribution with current limiting and thermal protection. Its 16 pins serve distinct functions for monitoring and controlling power, ensuring safe operation for sensitive devices.