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Overvoltage protection circuits operate as a switch controller

Posted: 05 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max6495? max6499? overvoltage protection circuit?

Maxim Integrated Products unveiled overvoltage protection circuits that operate as a switch controller to either disconnect or limit the output voltage to a load during an overvoltage condition.

The MAX6495-MAX6499 circuits turn off an external n-channel MOSFET with an internal 100mA pulldown current when the monitored voltage exceeds its overvoltage threshold. These low-power devices consume 20?A of quiescent current and operate from 5.5V to 72V, making them suitable for automotive, industrial and server applications.

The MAX6497 features a latch-off mode that disables the MOSFET until the power or shutdown input is cycled. The MAX6498 features an autoretry mode that attempts to turn on the MOSFET when the voltage falls to 130mV. Three of the devices (MAX6495/MAX6496/MAX6499) can also be configured as a voltage limiter that provides a regulated output to allow for continuous operation. An internal charge pump on all circuits provides a 10V gate-to-source enhancement to minimize drain-to-source resistance during normal operation. Other features include a POK indicator (MAX6497/MAX6498) and the control logic for driving a p-channel MOSFET to provide reverse battery protection.

All devices offer a shutdown input. These protection circuits are offered in a small 3-by-3mm TDFN package and are fully specified from -40C to 125C. Prices for these devices start at $1.23 (1,000-up, FOB USA).

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