Auto-Reset Electronic Circuit Breaker

The LTC1153 electronic circuit breaker drives a low cost N-channel MOSFET to interrupt power to a sensitive electronic load in the event of an over-current condition. The breaker remains tripped for a period of time set by an external timing capacitor and then is automatically reset. This cycle continues until the over-current condition is removed, protecting both the sensitive load and the MOSFET switch.

The trip current, trip delay time and auto-reset period are programmable over a wide range to accommodate a variety of load impedances. An active high shut down input is also provided and interfaces directly to a PTC thermistor for thermal circuit breaking. An open-drain output is provided to report breaker status to the µP.

The LTC1153 is available in both 8-pin DIP and 8-pin SOIC packages.

Applications

* Power Bus Circuit Breaker

* SCSI Termination Power Protection

* Regulator Over-Current Protection

* Battery Short-Circuit Protection

* DC Motor Stall Protection

* Sensitive System Power Interrupt

* Programmable Trip Delay: 15µs to >100ms

* Programmable Trip Current: 1mA to >20A

* Programmbale Auto-Reset Time: 1ms to >10 sec.

* 4.5V to 18V Supply Range

* Drives Low RDS(ON) N-Channel MOSFETs

* Status Output Indicates Fault Condition

* Thermal Trip with PTC Thermistor

* 8µA IQ in Standby Mode

* No External Charge Pump Capacitors

* Available in 8-Pin SOIC