Linear Technology Corporation released LTC4213, an electronic circuit breaker that senses load currents with RDS(ON) of an external MOSFET. For ultra low voltage applications, LTC4213 operates over a supply range of 2.3V to 6V and monitors voltages from ground up to 6V.
The electronic circuit breaker offers three pin-selectable VDS thresholds of 25mV, 50mV and 100mV. The circuit breaker also provides dual level and dual response time functions for overcurrent protection.
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http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1006,C1163,P10692
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