LTC1153 Datasheet

• 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 R_DS(_ON) N-Channel MOSFETs
• Status Output Indicates Fault Condition
• Thermal Trip with PTC Thermistor
• 8µA I_Q in Standby Mode
• No External Charge Pump Capacitors
• Available in 8-Pin SOIC

• Power Bus Circuit Breaker
• SCSI Termination Power Protection
• Regulator Over-Current Protection
• Battery Short-Circuit Protection
• DC Motor Stall Protection
• Sensitive System Power Interrupt

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.