Overview
The TPS2551DBVR is a current-limited power-distribution switch produced by Texas Instruments. This device is designed for applications where heavy capacitive loads and short-circuits are likely to be encountered. It features an adjustable current-limit threshold between 100 mA and 1.1 A, which can be set via an external resistor. The TPS2551DBVR incorporates a high-side N-channel MOSFET with a low on-state resistance, providing efficient power distribution. It also includes built-in protection features such as overcurrent, overtemperature, and reverse-voltage protection, ensuring reliable operation in various environments.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 2.5 | 6.5 | V | |
| Enable Voltage (VEN) | 0 | 6.5 | V | |
| Continuous Output Current (IOUT) | 0 | 1.1 | A | |
| Current-Limit Set Resistor (RILIM) | 14.3 kΩ | 80.6 kΩ | kΩ | |
| FAULT Sink Current (I/FAULT) | 0 | 10 mA | mA | |
| Operating Junction Temperature (TJ) | -40°C | 125°C | °C | |
| Static Drain-Source On-State Resistance (rDS(on)) | 94 mΩ | 100 mΩ | 140 mΩ | mΩ |
| Rise Time (tr) | 1.0 ms | 1.5 ms | ms | |
| Fall Time (tf) | 0.2 ms | 0.5 ms | ms | |
| ESD Protection (Human Body Model) | ±2000 V | V |
Key Features
- Adjustable Current Limit: The current-limit threshold can be adjusted between 100 mA and 1.1 A using an external resistor.
- Fast Overcurrent Response: Typical response time of 2 μs.
- High-Side MOSFET: 94-mΩ on-state resistance in the DBV package.
- Reverse Input-Output Voltage Protection: Prevents damage from reverse voltage conditions.
- Built-in Soft-Start: Limits large current and voltage surges during startup.
- ESD Protection: Up to 15 kV with external capacitance.
- Thermal Shutdown: Protects the device from overtemperature conditions.
- FAULT Flag: Open-drain output indicates overcurrent, overtemperature, or reverse-voltage conditions.
- Low Standby Supply Current: Maximum of 1 μA.
Applications
- USB Ports/Hubs: Meets USB power distribution requirements, including current limiting and fault reporting.
- Cell Phones and Laptops: Suitable for power management in portable electronics.
- Heavy Capacitive Loads: Handles loads with high capacitance without compromising performance.
- Reverse-Voltage Protection: Protects against reverse voltage conditions in various applications.
Q & A
- What is the adjustable current-limit range of the TPS2551DBVR?
The current-limit threshold can be adjusted between 100 mA and 1.1 A using an external resistor.
- What is the typical response time for overcurrent conditions?
The typical response time for overcurrent conditions is 2 μs.
- What is the on-state resistance of the high-side MOSFET in the DBV package?
The on-state resistance is 94 mΩ in the DBV package.
- Does the TPS2551DBVR have reverse input-output voltage protection?
- What is the purpose of the built-in soft-start feature?
The built-in soft-start feature limits large current and voltage surges during startup.
- What level of ESD protection does the TPS2551DBVR offer?
The device offers up to 15 kV ESD protection with external capacitance.
- How does the thermal shutdown feature work?
The device protects itself from overtemperature conditions by shutting down when the junction temperature exceeds 135°C and restarting when it cools down by 15°C.
- What is the function of the FAULT flag?
The FAULT flag is an open-drain output that indicates overcurrent, overtemperature, or reverse-voltage conditions.
- What is the maximum standby supply current of the TPS2551DBVR?
The maximum standby supply current is 1 μA.
- In what types of applications is the TPS2551DBVR commonly used?
The TPS2551DBVR is commonly used in USB ports/hubs, cell phones, laptops, and applications with heavy capacitive loads.
