Description
The LTC®4380 low quiescent current surge stopper protects loads from high voltage transients. Overvoltage protection is provided by clamping the gate voltage of an external N-channel MOSFET to limit the output voltage to a safe value during overvoltage events such as load dump in automobiles. Fixed gate clamp voltages are selectable for 12V and24V/28V systems. For systems of any voltage up to72V, use the adjustable gate clamp versions. Overcurrent protection is also provided.

FEATUREs
Low Quiescent Current: 8µA Operating, 6µA Shutdown
Withstands Surge Voltage Up to the MOSFET Limit
Wide Operating Voltage Range: 4V to 72V
Overcurrent Protection
Selectable Internal 31.5V/50V or Adjustable Gate Clamp Voltage (Table 1)
Reverse Input Protection to –60V
Adjustable Turn-On Threshold
Adjustable Fault Timer with MOSFET Stress Acceleration
Controls N-Channel MOSFET
Latchoff and Retry Options (Table 1)
Low Retry Duty Cycle During Faults (Table 1)
10-Pin DFN (3mm × 3mm) and MSOP Packages

APPLICATIONs
Automotive/Avionic/Industrial Surge Protection
Hot Swap/ Live Insertion
High Side Switch for Battery Powered Systems
Intrinsic Safety Applications