Overview
The STEF12H60MPUR is a 60 A integrated electronic fuse designed by STMicroelectronics, optimized for monitoring and controlling the output current and input voltage over 12 V DC power lines. This device is particularly useful in applications requiring high current protection and management, such as server main power rails, hot-swap boards, and high-power industrial systems. The STEF12H60MPUR features advanced protection mechanisms including overcurrent, short-circuit, and thermal protection, ensuring reliable operation and preventing damage to the system.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| VIN (Input Supply Voltage) | 5 | 12 | 18 | V |
| IOUT (Continuous Output Current) | - | 60 | 75 | A |
| IDD (LDO Continuous Output Current) | - | 50 | 60 | mA |
| VDD (LDO Output Voltage) | 4.6 | 4.9 | 5.2 | V |
| TJ (Operating Junction Temperature) | -40 | - | 125 | °C |
| RCS (Current Set Resistor) | 1.8 | 4 | - | kΩ |
| VCLREF (Control Voltage Range) | 0.2 | 1.4 | - | V |
| tSS (Soft-start Duration) | 10 | 50 | 100 | ms |
| COUT (Output Capacitance) | - | - | 47 | μF |
Key Features
- Adjustable Current Limit: The current limit can be set by the user via the CLREF pin.
- Integrated 0.85 mΩ Power MOSFET: Low resistance power switch for efficient operation.
- Enable/Disable Pin: Allows for external control of the device.
- Programmable Turn-on Time: Adjustable soft-start duration to control inrush current.
- Accurate Current Monitor Signal: Provides continuous information about the load current.
- Precise Temperature Monitor: Monitors device temperature to prevent overheating.
- Overcurrent and Fault Status Flags: Indicates the status of the device through GOK and D_OC pins.
- Internal MOSFET Self-Diagnostic: Checks for MOSFET faults such as drain-source shorts.
- Parallel Operation: Multiple devices can work in parallel to increase total current capability.
- Thermal Protection: Automatically shuts down the device if the temperature exceeds the thermal threshold.
- Fault Management: Available in latch-off (STEF12H60MPUR) and auto-retry (STEF12H60MAPUR) versions.
Applications
- Server Main eFuse: Protects the main power rail in server systems.
- Hot-swap Boards: Ensures safe and reliable hot-swapping of power modules.
- High Power Industrial 12 V Rail Protection: Protects high-power industrial systems from overcurrent and short-circuit conditions.
Q & A
- What is the maximum continuous output current of the STEF12H60MPUR?
The maximum continuous output current is 60 A, with a peak current capability of up to 75 A.
- What is the operating input voltage range for the STEF12H60MPUR?
The operating input voltage range is from 5 V to 18 V.
- How can the turn-on time be adjusted for the STEF12H60MPUR?
The turn-on time can be adjusted using an external capacitor connected to the SS pin, allowing for a soft-start duration between 10 ms and 100 ms.
- What type of thermal protection does the STEF12H60MPUR have?
The device has thermal protection that shuts down the power MOSFET if the junction temperature exceeds 140°C.
- Can multiple STEF12H60MPUR devices be used in parallel?
Yes, multiple devices can be used in parallel to increase the total current capability, with proper configuration of the ON/PD, SS, and CLREF pins.
- How does the STEF12H60MPUR handle fault conditions?
The STEF12H60MPUR latches off after a fault and can be reset by pulling the VDD pin below the UVLO threshold or by re-cycling the supply voltage.
- What is the purpose of the GOK and D_OC pins?
The GOK pin indicates the overall status of the device, while the D_OC pin indicates overcurrent conditions.
- How does the device monitor current and temperature?
The device uses a current sense circuit and a precise temperature sensor to monitor the load current and device temperature, respectively.
- What is the package type of the STEF12H60MPUR?
The device is packaged in a QFN32-5 x 5 package.
- What are the recommended operating conditions for the input voltage?
The recommended operating input voltage is between 8 V and 15 V.
