Overview
The TPS25921LD, produced by Texas Instruments, is a compact and feature-rich electronic fuse (eFuse) designed to provide robust protection for various systems and applications. It operates within a wide voltage range of 4.5V to 18V, making it suitable for controlling many popular DC buses. The device integrates a full suite of protection functions, including overcurrent, overvoltage, undervoltage, and thermal shutdown protection. This eFuse is particularly useful for hot-plug-in boards, offering in-rush current control and programmable output ramp rates to minimize voltage sag and prevent system resets.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 4.5 - 18 | V |
| Maximum Operating Voltage | 20 | V |
| RDS(ON) | 90 | mΩ (Typical) |
| 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 | °C |
| Thermal Shutdown Hysteresis | 20°C | °C |
| Package Type | SOIC-8 | - |
| Package Size | 4.90mm x 3.91mm | mm |
Key Features
- Precise Current Limiting: Adjustable current limit between 0.4 A and 1.6 A with ±2% accuracy at room temperature.
- Overvoltage and Undervoltage Protection: Programmable overvoltage and undervoltage thresholds with ±3% accuracy.
- Thermal Shutdown: Thermal protection with a threshold of 155°C and hysteresis of 20°C.
- In-Rush Current Control: Programmable output ramp rate to control in-rush current during hot-plug-in operations.
- Fault Reporting: Fault flag output (FLT) for system status monitoring and downstream load control.
- Auto-Retry and Latch-Off Versions: Available in both auto-retry (TPS25921A) and latch-off (TPS25921L) versions.
- UL Certifications: UL2367 recognized and UL60950 compliant for safe operation during single point failure tests.
Applications
- White Goods and Appliances: Suitable for protecting power supplies in household appliances.
- Set Top Boxes, DVD and Gaming Consoles: Provides robust protection for consumer electronics.
- HDD and SSD Drives: Ensures reliable operation of storage devices.
- Smart Meters and Gas Analyzers: Ideal for industrial and smart meter applications.
- USB Switches and Adapter Power Devices: Used in various power management and switching applications.
Q & A
- What is the operating voltage range of the TPS25921LD?
The TPS25921LD operates within a voltage range of 4.5V to 18V.
- What is the typical RDS(ON) of the TPS25921LD?
The typical RDS(ON) is 90 mΩ.
- How is the current limit adjusted on the TPS25921LD?
The current limit can be adjusted between 0.4 A and 1.6 A using an external resistor connected to the ILIM pin.
- What is the accuracy of the overvoltage and undervoltage thresholds?
The overvoltage and undervoltage thresholds have an accuracy of ±3%.
- What is the thermal shutdown threshold of the TPS25921LD?
The thermal shutdown threshold is 155°C with a hysteresis of 20°C.
- How does the TPS25921LD handle in-rush current during hot-plug-in operations?
The device provides programmable output ramp rates to control in-rush current, defined by an external capacitor connected to the SS pin.
- What types of fault reporting does the TPS25921LD support?
The device provides a fault flag output (FLT) for system status monitoring and downstream load control.
- Are there different versions of the TPS25921LD for fault handling?
Yes, the TPS25921LD is available in both auto-retry (TPS25921A) and latch-off (TPS25921L) versions.
- What certifications does the TPS25921LD hold?
The device is UL2367 recognized and UL60950 compliant for safe operation during single point failure tests.
- What are some common applications of the TPS25921LD?
Common applications include white goods, set top boxes, HDD and SSD drives, smart meters, and USB switches.
