No RSense electronic circuit breaker
18 May 2005
Power Electronics / Power Management
Linear Technology LTC4213 is an electronic circuit breaker that senses load currents with the RDS(ON) of an external MOSFET, eliminating the need for a sense resistor. This new method not only reduces voltage and power loss in the switch path, but also lowers the cost and simplifies design. This is especially beneficial to low voltage systems since the sense resistor voltage drop constitutes a significant portion of the supply voltage. For ultra low voltage applications, the LTC4213 operates over a bias supply range of 2,3 V to 6 V and monitors voltages from ground up to 6 V. Three pin-selectable VDS thresholds of 25 mV, 50 mV and 100 mV are available. The select pin can be stepped dynamically, and the circuit breaker also has a slow and a fast comparator to differentiate between slight overcurrents or catastrophic short circuits. It comes in a 12-lead DFN package.
Memec SA, +27 (0)12 674 4103
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