Features and Benefits
- Rugged Floating Topology
- Wide Operating Voltage Range: 9V to >500V
- Adjustable Output Clamp Voltage
- Controls N-Channel MOSFET
- Adjustable Protection Timer
- Internal 9 Second Cool-Down Timer
- Shutdown IQ < 14μA
- Available in 8-Lead TSOT and 8-Lead 3mm × 2mm DFN Packages
The LTC4366 surge stopper protects loads from high voltage transients. By controlling the gate of an external N-channel MOSFET, the LTC4366 regulates the output during an overvoltage transient. The load may remain operational while the overvoltage is dropped across the MOSFET. Placing a resistor in the return line isolates the LTC4366 and allows it to float up with the supply; therefore, the upper limit on the output voltage depends only on the availability of high valued resistors and MOSFET ratings.
An adjustable overvoltage timer prevents MOSFET damage during the surge while an additional 9-second timer provides for MOSFET cool down. A shutdown pin reduces the quiescent current to less than 14μA during shutdown. After a fault the LTC4366-1 latches off while the LTC4366-2 will auto-retry.
- Industrial, Automotive and Avionic Surge Protection
- High Voltage DC Distribution
- 28V Vehicle Systems
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (3)
Demonstration circuit 2150A uses the LTC4366-2 and LT4363-2 surge stoppers to satisfy MIL-STD-1275D. This specification, created by the United States Department of Defense, sets down requirements of electrical systems powered from a military vehicle’s 28V power supply. DC2150A’s output voltage is limited to 44V when faced with MIL-STD-1275D’s onerous surge, spike, and ripple conditions. In most circumstances, satisfying MIL-STD-1275D is as simple as placing this circuit in front of a 44V tolerant device. The default version, DC2150A-C, provides a minimum of 4A to the output in all conditions except the ±7V ripple condition (14Vpeak-to-peak). During the ripple condition, DC2150A-C provides a minimum of 2.8A to the load. Exceeding 2.8A during the input ripple condition may cause DC2150A-C to timeout and shutoff in less than MIL-STD-1275D’s one minute ripple ride-through requirement.
DC1850A-B: Demo Board for the LTC4366-1/LTC4366-2 High Voltage Surge Stopper.
Documentation & Resources
R547 Reliability Data3/26/2018
LTC4366 - Surge Stopper1/19/2012
Tools & Simulations
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Models for the following parts are available in LTspice:
LTC4366 Companion Parts
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