Overview
The TPS25921L, produced by Texas Instruments, is a compact and feature-rich electronic fuse (eFuse) designed to provide robust protection for systems operating within a voltage range of 4.5 V to 18 V. This device integrates a full suite of protection functions, including overcurrent, overvoltage, undervoltage, and thermal shutdown protection. It is particularly well-suited for applications requiring precise current limiting and voltage supervision, making it an ideal choice for various industrial and consumer electronics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 4.5 V to 18 V | V |
| Maximum Operating Voltage | 20 V | V |
| RDS(ON) | 90 mΩ (Typical) | mΩ |
| Adjustable Current Limit | 0.4 A to 1.6 A | A |
| Current Limit Accuracy at 25°C | ±2% | % |
| Overvoltage and Undervoltage Threshold Accuracy | ±3% | % |
| Junction Temperature Range | -40°C to 125°C | °C |
| Thermal Shutdown Threshold | 155°C (Rising) | °C |
| Thermal Shutdown Hysteresis | 20°C | °C |
| Package Type | SOIC | - |
| Package Size | 4.90mm x 3.91mm | mm |
Key Features
- Precise ±2% current limit at room temperature, adjustable between 0.4 A and 1.6 A via an external resistor.
- Programmable overvoltage and undervoltage protection with ±3% threshold accuracy.
- In-rush current control and programmable output ramp-rate for hot-plug-in applications.
- Fault output (FLT) for system status monitoring and downstream load control.
- Auto-retry and latch-off versions available (TPS25921A and TPS25921L respectively).
- UL2367 recognized and UL60950 compliant for safety during single point failure test.
- Programmable dVO/dt control to minimize conductive and radiated interference.
Applications
- White Goods and Appliances
- Set Top Boxes, DVD and Gaming Consoles
- HDD and SSD drives
- Smart Meters and Gas Analyzers
- Smart Load Switches and USB Switches
- Adapter Power Devices
Q & A
- What is the operating voltage range of the TPS25921L? The operating voltage range is from 4.5 V to 18 V, with a maximum operating voltage of 20 V.
- What is the typical RDS(ON) of the TPS25921L? The typical RDS(ON) is 90 mΩ.
- How is the current limit adjusted on the TPS25921L? The current limit is adjustable between 0.4 A and 1.6 A via an external resistor connected to the ILIM pin.
- What is the accuracy of the current limit at room temperature? The current limit accuracy at room temperature is ±2%.
- How does the TPS25921L protect against overvoltage and undervoltage conditions? The device provides programmable overvoltage and undervoltage protection with ±3% threshold accuracy.
- What is the purpose of the FLT pin on the TPS25921L? The FLT pin is an open-drain output that indicates fault conditions such as undervoltage, overvoltage, and thermal shutdown.
- Does the TPS25921L support hot-plug-in applications? Yes, it provides in-rush current control and programmable output ramp-rate for hot-plug-in applications.
- What are the thermal shutdown characteristics of the TPS25921L? The thermal shutdown threshold is 155°C with a hysteresis of 20°C.
- Is the TPS25921L compliant with any safety standards? Yes, it is UL2367 recognized and UL60950 compliant for safety during single point failure test.
- What are the package options for the TPS25921L? The TPS25921L is available in a SOIC package with dimensions of 4.90mm x 3.91mm.
