LTC7860: High Efficiency Switching Surge Stopper Data Sheet2/24/2015823K
Features and Benefits
- High Efficiency VOUT Clamp Stops High Voltage Input Surges
- SWITCH-ON Mode 100% Duty Cycle for Normal Operation
- PROTECTIVE PWM Mode for Transients and Faults
- VIN Pin to SGND Range: 3.5V to 60V
- External Input Voltage is Extendable to 200V+
- Adjustable Output Voltage Clamp
- Adjustable Output Overcurrent Protection
- Power Inductor Improves Input EMI in Normal Operation
- Programmable Fault Timer
- Adjustable Soft-Start for Input Inrush Current Limiting
- 4.5% Retry Duty Cycle During Faults
- Adjustable Switching Frequency: 50kHz to 850kHz
- Optional Reverse Input Voltage Protection
- Available in Thermally Enhanced 12-lead MSOP Package
The LTC7860 high efficiency surge stopper protects loads from high voltage transients. High efficiency permits higher currents and smaller solution sizes. During an input overvoltage event, such as a load dump in vehicles, the LTC7860 controls the gate of an external MOSFET to act as a switching DC/DC regulator (PROTECTIVE PWM mode). This operation regulates the output voltage to a safe level, allowing the loads to operate through the input over-voltage event. During normal operation (SWITCH-ON mode), the LTC7860 turns on the external MOSFET continuously, passing the input voltage through to the output. An internal comparator limits the voltage across the current sense resistor and regulates the maximum output current to protect against overcurrent faults.
An adjustable timer limits the time that the LTC7860 can spend in overvoltage or overcurrent regulation. When the timer expires, the external MOSFET is turned off until the LTC7860 restarts after a cool down period. By strictly limiting the time in PROTECTIVE PWM Mode when the power loss is high, the components and thermal design can be optimized for normal operation and safely operate through high voltage input surges and/or overcurrent faults. An additional PMOS can be added for reverse battery protection.
- Industrial and Automotive Power
- Telecom Power
- Vehicle Power Including ISO7637
- Military Power Including MIL1275
Markets and Technologies
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 (2)
Demonstration circuit 2392A is a high efficiency switching surge stopper featuring the LTC7860. The board operates from an input range of 7V to 100V, and provides a 7V to 34V output at 0A to 10A. Its output is current limited. A soft-start feature controls output voltage slew rate at startup, reducing current surge and voltage overshoot. The demonstration board includes an optional reverse polarity protection MOSFET and has options for an input filter and diode to attenuate spikes. For a lower output voltage limit of less than 12V, there is an optional feedback circuit.
Demonstration circuit 2239A is a High Efficiency Switching Surge Stopper and EMI Filter featuring the LTC7860. The board operates from an input range of 3.5V to 60V, provides a 3.5V to 17.2V output at 0A to 5A and is output current limited. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. The demonstration board has options for smaller MOSFET and diode packages on the back of the board for lower output current requirements.
Documentation & Resources
R547 Reliability Data3/26/2018146 K
DC2392A - Demo Manual1/8/2016326K
DC2239A - Demo Manual4/27/2015315K
Surge Stoppers Video Product Brief10/30/2018
LTC7860 Video Product Brief10/15/2018
Tools & Simulations
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LTC7860 Companion Parts
Recommended Related Parts
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC7860EMSE#PBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860EMSE#TRPBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860HMSE#PBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860HMSE#TRPBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860IMSE#PBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860IMSE#TRPBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860MPMSE#PBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|LTC7860MPMSE#TRPBF||Material Declaration||Reliability Data||12-Lead MSOP w/ EP|
|Wafer Fabrication Data||R547 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.