STMicroelectronics STEF512PUR Dual Electronic Fuse
STMicroelectronics STEF512PUR Dual Electronic Fuse is designed to protect circuitry on the output from overcurrent and overvoltage events in applications requiring hot-swap operation and in-rush current control. The STEF512PUR embeds two independent electronic fuses, one for 5V rails and one for 12V rails. Due to the very low ON-resistance of the integrated power FETs, the voltage drop from the main supply to the load is very low during normal operation. The user can adjust the startup time via two small soft-start capacitors, connected to the relevant pins. In this way, the inrush current at startup can be kept under control. The maximum load current of the STEF512PUR is precisely limited by utilizing a sense FET topology, to factory-defined values of 3A for a 5V output and 4A for a 12V output.
The STEF512PUR from STMicroelectronics also provides a precise overvoltage clamp for each channel, preventing the load from being damaged from power supply failures. Undervoltage lockout (UVLO) assures that the input voltage is above the minimum operating threshold before the power device is turned on.
When an overload condition occurs, the STEF512PUR limits the output current to the predefined safe value. If the anomalous overload condition persists, the device goes into thermal shutdown, the internal switch is opened, and the load is disconnected from the power supply.
In the QFN10 package, two current monitor pins are available, providing continuous information on the load current for each channel.
Features
- 5V and 12V channels into one chip
- Output overvoltage clamp
- Fixed current limit
- 3A on 5V
- 4A on 12V
- Latched-off thermal protection
- Input undervoltage lockout
- Adjustable output voltage slew rate for each channel
- Integrated 40mΩ Power FETs
- SAS disable pin
- Current monitor output
- Compact 2mm x 3mm QFN10 package
Applications
- HD and SSD drives
- Set-top boxes
- Media players
- DVD and Blu-ray players
Block Diagram (1 Channel)
Typical Application Circuit
Package Outline
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A broad range of drop-in replacements for general-purpose analog ICs, discretes, and serial EEPROMs.