Overview
The TPS2530DBVR is a current-limited, power-distribution switch produced by Texas Instruments. This device is designed to provide 0.5 A continuous load current in 3.3 V or 5 V circuits, making it suitable for applications where short circuits or heavy capacitive loads are encountered. The TPS2530DBVR utilizes N-channel MOSFETs for low resistance, ensuring minimal voltage drop to the load. It features an internal charge pump, gate drive circuitry, and various protection mechanisms such as overcurrent, overtemperature, and undervoltage lockout (UVLO).
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Operating Temperature | 85 | °C |
| Minimum Operating Temperature | -40 | °C |
| Maximum Supply Voltage | 5.5 | V |
| Minimum Supply Voltage | 2.7 | V |
| Continuous Load Current | 0.5 | A |
| On-Resistance (RDS(on)) | 97 | mΩ |
| Enable Input Logic Levels | TTL and CMOS compatible | |
| UVLO Turn-On Threshold | VIN rising edge: 2.7 V typical | V |
| Short-Circuit Response Time | 2 µs |
Key Features
- Current Limiting: The TPS2530DBVR limits output current to prevent overloads, maintaining a constant current during short circuits or heavy loads.
- Overtemperature Protection: The device turns off when the junction temperature exceeds 135°C and restarts once it cools down by 20°C.
- Undervoltage Lockout (UVLO): Prevents the power switch from turning on until the input voltage reaches the UVLO turn-on threshold, with built-in hysteresis to avoid unwanted on/off cycling.
- Enable Input: Compatible with both TTL and CMOS logic levels, allowing for easy integration into various systems.
- Internal Charge Pump and Gate Drive: Supplies power to the gate driver circuit and controls the rise and fall times of the output voltage to limit large current and voltage surges.
- Deglitched Fault Reporting (FLT): An open-drain output that indicates over-load or over-temperature conditions with a deglitch period to avoid false reporting.
Applications
The TPS2530DBVR is designed for use in various applications where reliable power distribution and protection against short circuits and overloads are critical. These include:
- USB Power Switches: Ideal for USB applications requiring current limiting and protection against short circuits and overloads.
- Power Distribution in Embedded Systems: Suitable for systems that require controlled power distribution with built-in protection mechanisms.
- Capacitive Load Management: Effective in managing heavy capacitive loads and preventing voltage undershoots.
Q & A
- What is the maximum continuous load current of the TPS2530DBVR?
The maximum continuous load current is 0.5 A.
- What are the operating temperature ranges for the TPS2530DBVR?
The device operates between -40°C and 85°C.
- What is the typical on-resistance (RDS(on)) of the TPS2530DBVR?
The typical on-resistance is 97 mΩ.
- How does the TPS2530DBVR handle overcurrent conditions?
The device limits the output current to a constant value during overloads and turns off if the junction temperature exceeds 135°C.
- What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature prevents the power switch from turning on until the input voltage reaches a specified threshold, preventing unwanted on/off cycling due to input voltage drops.
- How does the enable input work on the TPS2530DBVR?
The enable input is compatible with TTL and CMOS logic levels and controls the power switch, charge pump, and other circuits. It should not be left open and can be tied to VIN or GND.
- What is the function of the internal charge pump and gate drive circuitry?
The internal charge pump and gate drive circuitry supply power to drive the N-channel MOSFET and control the rise and fall times of the output voltage to limit current and voltage surges.
- How does the deglitched fault reporting (FLT) work?
The FLT output is an open-drain signal that indicates over-load or over-temperature conditions with an 8 ms deglitch period to avoid false reporting.
- What is recommended for controlling voltage undershoots in applications with large output inductance?
A high-value output capacitor, such as a 120 µF minimum for USB applications, is recommended to control voltage undershoots.
- How should input and output capacitance be optimized for the TPS2530DBVR?
A 0.1 µF or greater ceramic bypass capacitor between IN and GND is recommended for local noise decoupling. Output capacitance should be optimized based on the specific application requirements.
