LT6105 Precision, Extended Input Range Current Sense Ampli er FEATURES DESCRIPTION n Very Wide, Over-the-Top , Input Common Mode Range The LT 6105 is a micropower, precision current sense + - Extends 44V Above V (Independent of V ) ampli er with a very wide input common mode range. - Extends 0.3V Below V The LT6105 monitors unidirectional current via the volt- n Wide Power Supply Range: 2.85V to 36V age across an external sense resistor. The input common n Input Offset Voltage: 300V Maximum mode range extends from 0.3V to 44V, with respect to n Gain Accuracy: 1% Max the negative supply voltage (V ). This allows the LT6105 n Gain Con gurable with External Resistors to operate as a high side current sense monitor or a low n Operating Current: 150A side current sense monitor. It also allows the LT6105 to n Slew Rate: 2V/s monitor current on a negative supply voltage, as well as n Sense Input Current When Powered Down: 1nA continuously monitor a battery from full charge to depletion. n Full-Scale Output Current: 1mA Minimum The inputs of LT6105 can withstand differential voltages n Operating Temperature Range 40C to 125C up to 44V, which makes it ideal for monitoring a fuse or n Available in 2mm 3mm DFN and 8-Lead MSOP MOSFET switch. Packages Gain is con gured with external resistors from 1V/V to 100V/V. The input common mode rejection and power supply rejection are in excess of 100dB and the input offset APPLICATIONS voltage is less than 300V. A typical slew rate of 2V/s n High Side or Low Side Current Sensing ensures fast response to unexpected current changes. n Current Monitoring on Positive or Negative Supply The LT6105 can operate from an independent power Voltages supply of 2.85V to 36V and draws only 150A. When n Battery Monitoring + V is powered down, the sense pins are biased off. This n Fuse/MOSFET Monitoring prevents loading of the monitored circuit, irrespective of n Automotive the sense voltage. The LT6105 is available in a 6-lead DFN n Power Management and 8-lead MSOP package. n Portable Test/Measurement Systems , LT, LTC, LTM and Over-the-Top are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Gain Error vs Input Voltage 4 + V = 12V Gain of 50 Current Sense Ampli er V = 50mV SENSE 3 R = 100 IN SOURCE LT6105 A = 50V V 0.3V TO 44V 2 R IN2 T = 40C + A V 100 1 S +IN + T = 25C A V 0 OUT 0.02 R IN1 V = 1V/A OUT 100 IN 1 R OUT T = 125C T = 85C A A 4.99k 2 V S + V V 3 TO LOAD 2.85V TO 36V 6105 TA01 4 R R OUT OUT + 0 5 10 15 20 25 30 35 40 45 VV=V A== RR ==R OUT()S S V IN12IN IN + R R IN IN V INPUT VOLTAGE (V) 6105 TA01b S 6105fa 1 GAIN ERROR (%)LT6105 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Speci ed Temperature Range (Note 5) Differential Input Voltage (+IN IN) .....................44V LT6105C ................................................... 0C to 70C Input Voltage V(+IN, IN) to V ................ 9.5V to 44V + LT6105I ................................................40C to 85C Total V Supply Voltage from V ............................... 36V LT6105H ............................................40C to 125C Output Voltage ......................................V to (V + 36V) Maximum Junction Temperature........................... 150C Output Short-Circuit Duration (Note 3) ............ Inde nite Storage Temperature Range ...................65C to 150C Operating Temperature Range (Note 4) Lead Temperature (Soldering, 10 sec) LT6105C ...............................................40C to 85C MSOP ...............................................................300C LT6105I ................................................40C to 85C LT6105H ............................................40C to 125C PIN CONFIGURATION TOP VIEW TOP VIEW 6 IN 1 +IN IN 1 8 +IN + + 7 V 2 5 NC V 2 7 NC NC 3 6 NC V 3 4 V OUT V4 5 V OUT MS8 PACKAGE DCB PACKAGE 8-LEAD PLASTIC MSOP 6-LEAD (2mm 3mm) PLASTIC DFNs T = 150C, = 250C/W JMAX JA T = 150C, = 64C/W JMAX JA EXPOSED PAD (PIN 7) CONNECTED TO V (PIN 3) ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6105CDCB TRMPBF LT6105CDCB TRPBF LCTF 0C to 70C 6-Lead (2mm 3mm) Plastic DFN LT6105IDCB TRMPBF LT6105IDCB TRPBF LCTF 6-Lead (2mm 3mm) Plastic DFN 40C to 85C LT6105HDCB TRMPBF LT6105HDCB TRPBF LCTF 40C to 125C 6-Lead (2mm 3mm) Plastic DFN LT6105CMS8 PBF LT6105CMS8 TRPBF LTCTD 8-Lead Plastic MS8 0C to 70C LT6105IMS8 PBF LT6105IMS8 TRPBF LTCTD 8-Lead Plastic MS8 40C to 85C LT6105HMS8 PBF LT6105HMS8 TRPBF LTCTD 8-Lead Plastic MS8 40C to 125C TRM = 500 pieces. *Temperature grades are identi ed by a label on the shipping container. Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for parts speci ed with wider operating temperature ranges. For more information on lead free part marking, go to: