• AEC-Q100 Grade 1 Qualified
• 2.7V - 18V Operating Voltage, 21V Max
• Ultra Low RDS(ON): 46mΩ RON (Typical)
• Adjustable Current Limit: 0.6A to 5.3A
• IMON Current Indicator Output
• Operating IQ: 130μA (VIN = 12V, Typical)
• Reverse Current Blocking
• Programmable Output Slew Rate Control
• Power Good and Fault Outputs
• -40°C to 125°C Junction Temperature Range
• RoHS Compliant and Halogen Free
• Compact Package: QFN 3×4-20

The SA21816C smart switch is a highly integrated circuit and power management device, offering a range of protection functions, including a low-power DevSleep mode.

It operates across a wide input voltage range from 2.7V to 18V, making it suitable for controlling various DC BUS voltages in SSD applications. The device features integrated back-to-back MOSFETs for bidirectional current control, ideal for systems with load-side energy reservoirs that must not drain back to a failed supply BUS.

The SA21816C includes programmable features such as overcurrent, output slew rate control, overvoltage, and undervoltage thresholds, requiring minimal external components. It provides PGOOD, FLT_N, and precise current monitoring outputs for comprehensive system status monitoring and downstream load control. The device's precise programmability and low IQ DevSleep mode enhance the simplicity of SSD power management design.

The SA21816C achieves true reverse current blocking by monitoring the condition VIN < (VOUT - 25mV). This facilitates a rapid transition to a boosted voltage energy storage element in systems where the backup voltage exceeds the BUS voltage.