Eliminates or reduces size of heatsink required
Astute Electronics, the leading supplier of electronic components and value added services, has introduced Linear Technology’s high efficiency LTC7860 surge stopper ICs which protect loads from high voltage transients. 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 (SWITCHON 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.
Comments Ian Fantham, Sales Director, Astute Electronics: “Traditionally, designers need to include a large, heavy heatsink to allow operation to continue, just for the rare over-voltage instances. Because the LTC7860 uses an efficient switching topology, designers can use a much smaller heatsink, or no heat sink at all.”
Available in small, thermally-enhanced 12-lead MSOP packaging, the devices feature an adjustable timer which 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.
Applications include military power systems to MIL1275, ISO7637 vehicle systems and general power supplies for industrial and telecoms equipment.
About Astute
Astute Electronics promises to deliver customers the best Quality, Service and Reliability. Astute is both an Electronic Components distributor and a global and UK parts supplier. Technical and Sales offices are located in the UK, the USA, China, India, Mexico and Israel, and the company’s highly-qualified team is experienced in procurement, engineering, logistics, finance, program management and QA. Astute has developed relationships with the world’s leading OEMs and EMS companies, providing services including buffer stocking, price-supported contracts and obsolescence management. Astute is AS9120 accredited and has achieved Silver Status in the SC21 program.
For more information, please contact:
Ian Fantham, Sales Director, Astute Electronics
Tel: +44-1920-484838
or
Nick Foot – PR Director, BWW Communications
+44-1491-636393
