STEF12SAGR

STEF12SAGR is an integrated electronic fuse optimized to monitor the 12VDC power lines. When connected in series to the main power rail, it is able to precisely detect and react to overcurrent and overvoltage conditions. When an overload condition occurs, the device limits the output current to a safe value defined by the user. If the anomalous overload condition persists, the device goes into an open state, disconnecting the load from the power supply. In case of overvoltage on the input, the device regulates the output to a preset safe value. Undervoltage lockout prevents the load from malfunction, keeping the device off if the rail voltage is too low. It features the adjustable turn-on slew-rate, which is useful to keep the in-rush current under control during startup and hot-swap operations. Application includes hard disk and SSD drives, hard disk array, hot-swap board, hot-plug protection.

• Low inrush current during startup
• 15V typical output overvoltage clamp, absolute maximum voltage of 25V
• Adjustable current limit, thermal protection
• Input undervoltage lockout
• Integrated 40mohm power FET, En/fault pin
• Adjustable slew rate for output voltage
• Gate control pin for reverse current blocking FET
• 40mohm on-resistance typical (TJ= 25°C, VCC = 12V, VEn/Fault = 5V)
• 250µs delay time typical (enabling of chip to soft start beginning (10% of VOUT), No Cdv/dt)
• TSOT23-8 packing, operating junction temperature range from -40°C to 125°C