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Ideal diode controller tips negative input protection

Posted: 05 Jun 2012 ?? ?Print Version ?Bookmark and Share

Keywords:ideal diode controller? Schottky diodes?

Linear Technology Corp. has launched a simple low loss replacement to Schottky diodes for automotive, avionics as well as solar applications. The LTC4359 high voltage ideal diode controller operates from 4V to 80V supply range, withstanding input voltages between -40V to 100V without damage.

Its operating current is 150?A, with a low current shutdown mode that uses only 13?A. The LTC4359 is guaranteed for operation across the -40C to 125C ambient temperature range, making it suitable for protecting loads in harsh automotive environments such as during load dump, cold crank, two-battery jumps, and reverse battery connections.

Combining the ideal diode with the company's LT4363 high voltage Surge Stopper provides solid front-end protection from overvoltage, overcurrent and reverse battery. Solar systems also benefit from the low operating current of this device, where the LTC4359 can be used to provide a low loss path that isolates the solar panel from the load.

The LTC4359 controls an external N-channel MOSFET to perform the function of a low forward voltage diode. This provides a lower loss path compared to Schottky diodes and in high power applications provides a more efficient solution and preserves board space by reducing the need for heat sinking. In addition, control of back-to-back MOSFETs is available to prevent current flowing from input to output during shutdown. The LTC4359 controls the forward voltage drop across the MOSFET to ensure smooth current delivery without oscillation, even under light loads. If a power source fails or is shorted, a fast The LTC4359 single ideal diode controller can also be used in applications where multiple power supplies are paralleled to provide redundancy. In N+1 redundant systems, an additional supply is added to safeguard the system in the event one of the supplies fail. ORing the supplies together allow disconnection from the power bus for an input failure or hard short. Additionally, the LTC4359 can be used with a reservoir capacitance to hold up the supply for a period of time after a loss of input power. This enables continuing system operation without resetting or rebooting due to brief interruptions of input power.

Specified over the commercial, industrial and automotive temperature ranges, the LTC4359 is offered in 2 x 3mm 6-lead DFN and 8-lead MSOP packages. Pricing begins at $2.10 each in 1,000 piece quantities. The device is available now. Free samples and demo boards are also available.





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