LT6108-1/LT6108-2 High Side Current Sense Amplifier with Reference and Comparator FEATURES DESCRIPTION n Current Sense Amplifier The LT 6108 is a complete high side current sense device Fast Step Response: 500ns that incorporates a precision current sense amplifier, an Low Offset Voltage: 125V Maximum integrated voltage reference and a comparator. Two ver- Low Gain Error: 0.2% Maximum sions of the LT6108 are available. The LT6108-1 has a n Internal 400mV Precision Reference latching comparator and the LT6108-2 has a non-latching n Internal Comparator comparator. In addition, the current sense amplifier and Fast Response Time: 500ns comparator inputs and outputs are directly accessible. The Total Threshold Error: 1.25% Maximum amplifier gain and comparator trip point are configured Latching or Non-Latching Comparator Option by external resistors. The open-drain comparator output n Wide Supply Range: 2.7V to 60V allows for easy interface to other system components. n Supply Current: 450A The overall propagation delay of the LT6108 is typically only n Low Shutdown Current: 5A Maximum 1.4s, allowing for quick reaction to overcurrent condi- n Specified for 40C to 125C Temperature Range tions. The 1MHz bandwidth allows the LT6108 to be used n Available in 8-Lead MSOP and 8-Lead (2mm 3mm) for error detection in critical applications such as motor DFN Packages control. The high threshold accuracy of the comparator, combined with the ability to latch the comparator, ensures APPLICATIONS the LT6108 can capture high speed events. n Overcurrent and Fault Detection The LT6108 is fully specified for operation from 40C to n Current Shunt Measurement 125C, making it suitable for industrial and automotive n Battery Monitoring applications. The LT6108 is available in the small 8-lead n Motor Control MSOP and 8-lead DFN packages. n Automotive Monitoring and Control n L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks Remote Sensing of Linear Technology Corporation. All other trademarks are the property of their respective n Industrial Control owners. TYPICAL APPLICATION Response to Overcurrent Event Circuit Fault Protection with Very Fast Latching Load Disconnect 0.1 IRF9640 12V TO LOAD V LOAD 0.1F 1k 100 6.2V* 10V/DIV SENSEHI SENSELO 0V + V OUTA V OUT I 3.3V LT6108-1 LOAD 200mA/DIV RESET EN/RST 6.04k 1k 10k 0mA 250mA DISCONNECT V OUTC 250mA DISCONNECT 2N2700 OUTC INC 5V/DIV 0V V 1.6k 610812 TA01a 610812 TA01b 5s/DIV *CMH25234B 610812fa 1LT6108-1/LT6108-2 ABSOLUTE MAXIMUM RATINGS (Note 1) + Total Supply Voltage (V to V ) .................................60V Amplifier Output Short-Circuit Duration (to V ) .. Indenfi ite Maximum Voltage Operating Temperature Range (Note 3) + (SENSELO, SENSEHI, OUTA) ............................... V + 1V LT6108I ................................................40C to 85C + Maximum V (SENSELO or SENSEHI) ....................33V LT6108H ............................................ 40C to 125C Maximum EN, EN/RST Voltage .................................60V Specified Temperature Range (Note 3) Maximum Comparator Input Voltage ........................60V LT6108I ................................................40C to 85C Maximum Comparator Output Voltage......................60V LT6108H ............................................ 40C to 125C Input Current (Note 2) ..........................................10mA Maximum Junction Temperature .......................... 150C SENSEHI, SENSELO Input Current ....................... 10mA Storage Temperature Range .................. 65C to 150C Differential SENSEHI or SENSELO Input Current ..2.5mA MSOP Lead Temperature (Soldering, 10 sec) ........300C PIN CONFIGURATION LT6108-1 LT6108-2 TOP VIEW TOP VIEW SENSELO 1 8 SENSEHI SENSELO 1 8 SENSEHI + + EN/RST 2 7 V EN 2 7 V 6 OUTA 6 OUTA OUTC 3 OUTC 3 V 4 5 INC V 4 5 INC MS8 PACKAGE MS8 PACKAGE 8-LEAD PLASTIC MSOP 8-LEAD PLASTIC MSOP = 163C/W, = 45C/W = 163C/W, = 45C/W JA JC JA JC TOP VIEW TOP VIEW SENSELO 1 8 SENSEHI SENSELO 1 8 SENSEHI + + EN/RST 2 7 V EN 2 7 V 9 9 OUTC 3 6 OUTA OUTC 3 6 OUTA 5 5 V 4 INC V 4 INC DCB PACKAGE DCB PACKAGE 8-LEAD (2mm 3mm) PLASTIC DFN 8-LEAD (2mm 3mm) PLASTIC DFN = 64C/W, = 10C/W = 64C/W, = 10C/W JA JC JA JC EXPOSED PAD (PIN 9) IS V , PCB CONNECTION OPTIONAL EXPOSED PAD (PIN 9) IS V , PCB CONNECTION OPTIONAL 610812fa 2