LTC1153 Datasheet | Linear Technology

LTC1153 Auto-Reset Electronic Circuit Breaker Features s s s s s s s s s s DESCRIPTIO Programmable Trip Delay: 15µs to >100ms Programmable Trip Current: 1m A 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 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 acmodate a variety of load impedances. An active high shutdown 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. APPLICATI s s s s s s Power Bus Circuit Breaker SCSI Termination Power Protection Regulator Over-Current Protection Battery Short-Circuit Protection DC Motor Stall Protection Sensitive System Power Interrupt TYPICAL APPLICATI 5V/1A Electronic Circuit Breaker with 1ms Trip Delay, 200ms Auto-Reset Period and 70°C Thermal Shutdown 10 ON/OFF CT 0.22µF Z5U TO µP 51k GND 5V - - 70°C PTC SENSITIVE 5V LOAD SHUTDOWN IN CT LTC1153 STATUS G 51k IRLR024 VS CD RD 0.01µF 100k DS TRIP DELAY (ms) - RSEN 0.1Ω 1 ALL PONENTS SHOWN ARE SURFACE MOUNT. - IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700 - - RL2006-100-70-30-PT1 KEYSTONE CARBON PANY (814) 781-1591 - TA01 0.01 1 10 CIRCUIT BREAKER CURRENT (A) 100 Trip Delay Time RSEN =...