The part you mentioned, "TPS2555DRCR," belongs to the Texas Instruments (TI) brand. It is a Power distribution switch IC designed to provide overcurrent and thermal protection, suitable for USB, battery-powered applications, and more.
Packaging
The TPS2555DRCR comes in an HTSSOP-16 package (16 pins).
Pin Function Specifications and Circuit Principle
The TPS2555DRCR has 16 pins. Below is a detailed explanation of the functionality of each pin:
Pin Number Pin Name Pin Function Description 1 IN Input voltage supply pin (typically 2.7V to 5.5V). 2 GND Ground pin for the device. 3 EN Enable input. When low, the device is off. When high, the device operates. 4 OUT Output voltage pin that supplies power to the load. 5 OVP Over-voltage protection pin. When the input voltage exceeds the threshold, the switch is turned off. 6 VCC Internal voltage reference. Provides a regulated voltage for the internal circuitry. 7 VDD Main power supply input for the internal logic. 8 ILIM Current limit input. Allows setting a current limit threshold. 9 GND Ground pin for the device. 10 UVLO Under-voltage lockout pin. Disables the device when the input voltage is below the set threshold. 11 FAULT Fault output, indicating if the output has been disabled due to fault conditions (e.g., overcurrent, thermal shutdown). 12 STATUS Status output. Can indicate normal operation or fault conditions. 13 PGND Power ground for the device, handling higher current paths. 14 TSD Thermal shutdown pin. Turns off the device if it overheats. 15 OUT Output voltage pin, used for connection to the load. 16 GND Ground pin for the device.Detailed Pin Function Descriptions
Pin 1 (IN): This is the input pin where the voltage from the power supply is connected. It typically ranges from 2.7V to 5.5V. Pin 2 (GND): This is the ground reference for the device and should be connected to the system ground. Pin 3 (EN): The enable pin controls the on/off state of the device. A logic high turns the device on, while a logic low disables the device. Pin 4 (OUT): This pin provides the output voltage to the load. It connects to the device or circuit that requires power. Pin 5 (OVP): The over-voltage protection pin monitors the input voltage. If the input voltage exceeds the threshold, it turns the switch off to protect downstream components. Pin 6 (VCC): Supplies the internal voltage for the logic and control circuits. This pin must be connected to an appropriate voltage supply to ensure the proper operation of the device. Pin 7 (VDD): Provides power to the internal control and protection logic, separate from the input power supply. Pin 8 (ILIM): This pin is used to set the current limit threshold. The device can be configured to limit the output current, ensuring safe operation for sensitive components. Pin 9 (GND): Another ground pin, providing a return path for the internal circuitry. Pin 10 (UVLO): The under-voltage lockout (UVLO) function prevents the device from operating if the input voltage falls below a safe threshold. Pin 11 (FAULT): If a fault condition such as overcurrent or thermal shutdown occurs, this pin will signal the fault state to the external system. Pin 12 (STATUS): This output pin indicates the operational status of the device, signaling whether the device is functioning normally or in a fault state. Pin 13 (PGND): The power ground pin, providing the return path for current flowing through the load. This pin ensures that the high-current paths are properly managed. Pin 14 (TSD): Thermal shutdown protects the device from overheating by shutting down the output if the internal temperature exceeds safe limits. Pin 15 (OUT): This is the same as Pin 4, providing the output voltage to the load. Pin 16 (GND): The final ground pin, ensuring the device has a stable ground reference.20 Common FAQs Related to TPS2555DRCR
Q: What is the input voltage range for TPS2555DRCR? A: The input voltage range is typically 2.7V to 5.5V.
Q: Can I use the TPS2555DRCR for USB power applications? A: Yes, TPS2555DRCR is suitable for USB power distribution and other battery-powered devices.
Q: How can I set the current limit for TPS2555DRCR? A: The current limit can be set using the ILIM pin, which allows for external resistor programming.
Q: What is the function of the OVP pin? A: The OVP pin provides over-voltage protection. It disables the output if the input voltage exceeds a preset threshold.
Q: How does the TPS2555DRCR protect against overcurrent conditions? A: TPS2555DRCR features an internal current limit circuit that monitors the output current and disables the output when the current exceeds the set threshold.
Q: Can the TPS2555DRCR be used in automotive applications? A: Yes, the TPS2555DRCR is suitable for various power distribution systems, including automotive applications.
Q: What happens if the input voltage is below the UVLO threshold? A: If the input voltage is below the under-voltage lockout threshold, the device will not operate.
Q: How does the thermal shutdown work in TPS2555DRCR? A: The TSD pin triggers a thermal shutdown when the device exceeds a safe operating temperature, turning off the output to prevent damage.
Q: Can I use the TPS2555DRCR with 3.3V inputs? A: Yes, the device supports 3.3V inputs within its operational voltage range.
Q: What is the purpose of the STATUS pin? A: The STATUS pin provides an indication of the device's operational status, signaling whether it is in a normal or fault state.
Q: How does the device handle short circuits? A: TPS2555DRCR limits the current during a short-circuit event and can turn off if the fault condition persists.
Q: Is there any configuration required to enable the device? A: The device is enabled by applying a logic high to the EN pin.
Q: What is the maximum current that TPS2555DRCR can supply? A: The maximum current depends on the settings for the current limit and thermal conditions, but the typical current limit can be set to a range of 500mA to 2A.
Q: How does the TPS2555DRCR handle output voltage spikes? A: The device includes over-voltage protection to prevent damage from spikes in the input voltage.
Q: Can I connect the TPS2555DRCR directly to a battery? A: Yes, the device can be used in battery-powered systems within the voltage range of 2.7V to 5.5V.
Q: What type of packaging is the TPS2555DRCR available in? A: The device is available in an HTSSOP-16 package.
Q: Does TPS2555DRCR have reverse current protection? A: No, TPS2555DRCR does not feature reverse current protection. External circuitry may be needed for this function.
Q: What is the purpose of the FAULT pin? A: The FAULT pin signals when a fault condition, such as overcurrent or thermal shutdown, occurs.
Q: How should the GND pins be connected? A: All GND pins should be connected to the system ground to ensure proper operation of the device.
Q: Is the TPS2555DRCR suitable for high-power applications? A: The TPS2555DRCR is designed for moderate power applications, but for high-power systems, consider devices with higher current handling capacities.
This comprehensive overview covers the essential specifications and pin functionalities for the TPS2555DRCR. Let me know if you'd like further clarification or additional details!