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Sas Disable +5V Efuse With Integrated Isofet

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The eFuse is a +5V protection device with a bidirectional switch that incorporates input slew rate control to reduce input surge current and reverse current detection to prevent discharge to Vcc from Vout. The eFuse protection features include under voltage lockout, a fixed 2.5A current limit, trimmed fast response over voltage protection and thermal shutdown. The Enable/Fault line is a tri-state bidirectional interface that can be used to disable the output by pulling the line low through an external open drain device. If a thermal fault occurs, the voltage on the pin will go to an intermediate voltage indicating a fault and it can be connected to another device to cause simultaneous shut down. The SAS pin is an ESD protected interface that allows direct external control of the eFuse. Driving the SAS pin high pulls the enable line low causing the eFuse to shutdown and enter a low quiescent current state.

The integrated Isofet latches off when the reverse current is detected. This can be reset only by triggering the under voltage lock out, by En/Fault pin or when voltage on the output pin (VOUT) falls below the supply pin voltage (VCC) in AP91352.

The AP91352 is available in a standard Green W-QFN3020-12 package and is RoHS compliant.


  • Operating Input Voltage: 3.6V to 12V
  • Integrated NMOS Power Device with RDS(ON) of 50mΩ Typical
  • Internal Current Limit - No External Current Sense Resistor in Load Path
  • Integrated ISOFET for reverse current protection
  • Undervoltage Lockout
  • Overvoltage Clamp & Over Current Protection
  • Thermal Shutdown
  • Fixed Slew Rate Control (13ms)
  • Support SAS Enable/Disable


  • Hard Disk Drives
  • Solid State Drives (SSD)
  • Set-Top Box
  • DVD and Blu-Ray Disc Driver
  • Mother Board Power Management
  • Printer Load Power Management
  • Fan Drives

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Maximum Continuous Output Current (A) 2
(MAX) Maximum Current Limit Fixed (A) 3
Channels 1
Enable Logic Active Low
Minimum Operating Voltage (V) 3.6
Maximum Operating Voltage (V) 12
Quiescent Current Typ (µA) 100
RDS(ON) (VIN = 5V) Typ (mΩ) 50
Reverse Current Block Yes
Output Discharge No
(TYP) Output Rise Time mS 13
OCP Output Latch Off N/A
OCP Flag No
Power Good No
Operating Ambient Temperature Range (°C) -40 to 125
UL Certificate No

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