LT6700IS6-1#TRM

LT6700/LT6700HV Micropower, Low Voltage, Dual Comparator with 400mV Reference DESCRIPTION FEATURES Internal 400mV Reference n Total Threshold Error: ±1.25% Max at 25°C n Inputs and Outputs Operate to 36V n Wide Supply Range: 1.4V to 18V n Specified for –55°C to 125°C Temperature Range n Low Quiescent Current: 6.5µA Typ at 5V n Internal Hysteresis: 6.5mV Typ n Low Input Bias Current: ±10nA Max n Over-The-Top® Input also Includes Ground n Open-Collector Outputs Allow Level Translation n Choice of Input Polarities: LT6700-1/LT6700-2/ LT6700-3/LT6700HV-1/LT6700HV-2/LT6700HV-3 n Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN Packages The LT®6700/LT6700HV combine two micropower, low voltage comparators with a 400mV reference in a 6-lead SOT-23 or tiny DFN package. Operating with supplies from 1.4V up to 18V, these devices draw only 6.5µA, making them ideal for low voltage system monitoring. Hysteresis is included in the comparators, easing design requirements to insure stable output operation. APPLICATIONS The three versions of this part differ by the polarity of the available comparator inputs. The LT6700-1/ LT6700HV-1 has one inverting input and one noninverting input, making it suitable for use as a window comparator. The LT6700-2/LT6700HV-2 has two inverting inputs and the LT6700-3/LT6700HV-3 has two noninverting inputs. All versions are offered in commercial, industrial and automotive temperature ranges. n n n n n n n n Battery-Powered System Monitoring Threshold Detectors Window Comparators Relay Driving Industrial Control Systems Handheld Instruments Automotive Monitor and Controls The comparators each have one input available externally; the other inputs are connected internally to the reference. The comparator outputs are open collector and the output load can be referred to any voltage up to 18V (36V for LT6700HV), independent of supply voltage. The output stage sinking capability is guaranteed to be greater than 5mA over temperature. L, LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Micropower Battery Monitor LT6700-3 + 1M ALKALINE AA CELLS VBATT > 1.6V 63.4k – VR = 400mV REFERENCE – 406 404 0.1µF + + 1M COMP B VS COMP A VBATT > 2V + MONITOR CONSUMES ~10µA HYSTERESIS IS APPROXIMATELY 2% OF TRIP VOLTAGE 261k THRESHOLD VOLTAGE (mV) 1M Comparator Thresholds vs Temperature VBATT 1.4V (MIN) 3V (NOM) #1A #1B #2A #2B RISING INPUT 402 400 398 396 FALLING INPUT 394 TWO TYPICAL PARTS 392 COMP A AND B VS = 5V 390 –60 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 6700123 TA02 6700123 TA01 6700123fh For more information www.linear.com/LT6700 1 LT6700/LT6700HV ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (VS to GND)...........................18.5V Input Voltage (+IN, –IN) LT6700 (Note 3)........................... 18.5V to (GND – 0.3V) LT6700HV (Note 3)......................... 40V to (GND – 0.3V) LT6700 Output Voltage (OUT)...... 18.5V to (GND – 0.3V) LT6700HV Output Voltage (OUT).... 40V to (GND – 0.3V) Output Short-Circuit Duration (Note 2)............. Indefinite Input Current (Note 3)...........................................–10mA Operating Temperature Range (Note 4) LT6700CS6/LT6700HVCS6/ LT6700CDCB-1/-2/-3 ...........................– 40°C to 85°C LT6700IS6/LT6700HVIS6/ LT6700IDCB-1/-2/-3 ............................. –40°C to 85°C LT6700HS6/LT6700HVHS6/ LT6700HDCB-1/-2/-3 ......................... –40°C to 125°C LT6700MPDCB/ LT6700MPS6-1/-2/-3.......................... –55°C to 125°C Specified Temperature Range (Note 5) LT6700CS6/LT6700HVCS6/ LT6700CDCB-1/-2/-3 .............................. 0°C to 70°C LT6700IS6/LT6700HVIS6/ LT6700IDCB-1/-2/-3 ............................. –40°C to 85°C LT6700HS6/LT6700HVHS6/ LT6700HDCB-1/-2/-3 ........................ –40°C to 125°C LT6700MPDCB/ LT6700PMS6-1/-2/-3.......................... –55°C to 125°C Maximum Junction Temperature S6 Package........................................................ 150°C DCB6 Package................................................... 150°C Storage Temperature Range S6 Package......................................... –65°C to 150°C DCB6 Package.................................... –65°C to 150°C Lead Temperature, TSOT-23 (Soldering, 10 sec).... 300°C PIN CONFIGURATION LT6700-1 LT6700HV-1 LT6700-2 LT6700HV-2 LT6700-3 LT6700HV-3 TOP VIEW OUTA 1 TOP VIEW 6 OUTB OUTA 1 TOP VIEW 6 OUTB OUTA 1 6 OUTB GND 2 5 VS GND 2 5 VS GND 2 5 VS +INA 3 4 –INB –INA 3 4 –INB +INA 3 4 +INB S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 230°C/W LT6700-1 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 230°C/W LT6700-2 LT6700-3 TOP VIEW OUTA 1 OUTB 2 VS 3 7 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 230°C/W TOP VIEW 6 + INA OUTA 1 5 GND OUTB 2 4 –INB VS 3 DCB6 PACKAGE 6-LEAD (2mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 64°C/W SOLDERED EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO GND (PCB CONNECTION OPTIONAL) 7 TOP VIEW 6 – INA OUTA 1 5 GND OUTB 2 4 –INB VS 3 DCB6 PACKAGE 6-LEAD (2mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 64°C/W SOLDERED EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO GND (PCB CONNECTION OPTIONAL) 6 + INA 7 5 GND 4 +INB DCB6 PACKAGE 6-LEAD (2mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 64°C/W SOLDERED EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO GND (PCB CONNECTION OPTIONAL) 6700123fh 2 For more information www.linear.com/LT6700 LT6700/LT6700HV ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION LT6700CS6-1#TRMPBF LT6700CS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700HVCS6-1#TRMPBF LT6700HVCS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700IS6-1#TRMPBF LT6700IS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700HVIS6-1#TRMPBF LT6700HVIS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700HS6-1#TRMPBF LT6700HS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700HVHS6-1#TRMPBF LT6700HVHS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700MPS6-1#TRMPBF LT6700MPS6-1#TRPBF LTK7 6-Lead Plastic TSOT-23 LT6700CS6-2#TRMPBF LT6700CS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700HVCS6-2#TRMPBF LT6700HVCS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700IS6-2#TRMPBF LT6700IS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700HVIS6-2#TRMPBF LT6700HVIS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700HS6-2#TRMPBF LT6700HS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700HVHS6-2#TRMPBF LT6700HVHS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700MPS6-2#TRMPBF LT6700MPS6-2#TRPBF LTADL 6-Lead Plastic TSOT-23 LT6700CS6-3#TRMPBF LT6700CS6-3#TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700HVCS6-3#TRMPBF LT6700HVCS6-3#TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700IS6-3#TRMPBF LT6700IS6-3#TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700HVIS6-3#TRMPBF LT6700HVIS6-3#TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700HS6-3#TRMPBF LT6700HS6-3#TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700HVHS6-3#TRMPBF LT6700HVHS6-3#TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700MPS6-3#TRMPBF LT6700MPS6-2 #TRPBF LTADM 6-Lead Plastic TSOT-23 LT6700CDCB-1#TRMPBF LT6700CDCB-1#TRPBF LBXW 6-Lead (2mm × 3mm) Plastic DFN LT6700IDCB-1#TRMPBF LT6700IDCB-1#TRPBF LBXW 6-Lead (2mm × 3mm) Plastic DFN LT6700HDCB-1#TRMPBF LT6700HDCB-1#TRPBF LBXW 6-Lead (2mm × 3mm) Plastic DFN LDVS LT6700MPDCB-1#TRMPBF LT6700MPDCB-1#TR 6-Lead (2mm × 3mm) Plastic DFN LT6700CDCB-2#TRMPBF LT6700CDCB-2#TRPBF LBXX 6-Lead (2mm × 3mm) Plastic DFN LT6700IDCB-2#TRMPBF LT6700IDCB-2#TRPBF LBXX 6-Lead (2mm × 3mm) Plastic DFN LT6700HDCB-2#TRMPBF LT6700HDCB-2#TRPBF LBXX 6-Lead (2mm × 3mm) Plastic DFN LT6700MPDCB-2#TRMPBF LT6700MPDCB-2#TR LDVT 6-Lead (2mm × 3mm) Plastic DFN LT6700CDCB-3#TRMPBF LT6700CDCB-3#TRPBF LBXY 6-Lead (2mm × 3mm) Plastic DFN LT6700IDCB-3#TRMPBF LT6700IDCB-3#TRPBF LBXY 6-Lead (2mm × 3mm) Plastic DFN LT6700HDCB-3#TRMPBF LT6700HDCB-3#TRPBF LBXY 6-Lead (2mm × 3mm) Plastic DFN LT6700MPDCB-3#TRMPBF LT6700MPDCB-3#TR LDVV 6-Lead (2mm × 3mm) Plastic DFN TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ SPECIFIED TEMPERATURE RANGE 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C to 85°C –40°C to 125°C –40°C to 125°C –55°C to 125°C 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C to 85°C –40°C to 125°C –40°C to 125°C –55°C to 125°C 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C to 85°C –40°C to 125°C –40°C to 125°C –55°C to 125°C 0°C to 70°C –40°C to 85°C –40°C to 125°C –55°C to 125°C 0°C to 70°C –40°C to 85°C –40°C to 125°C –55°C to 125°C 0°C to 70°C –40°C to 85°C –40°C to 125°C –55°C to 125°C 6700123fh For more information www.linear.com/LT6700 3 LT6700/LT6700HV ELECTRICAL CHARACTERISTICS A = 25°C, (LT6700-1/LT6700-2/LT6700-3) unless otherwise specified. T SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V 394 395 393 392 400 400 400 400 406 405 407 408 mV mV mV mV VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V 386 387 385 384 393.5 393.5 393.5 393.5 401 400 402 403 mV mV mV mV HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing 3.5 6.5 9.5 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V VS = 1.4V, 18V, VIN = 0.1V ±0.01 ±0.01 ±4 ±10 ±10 ±10 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.5mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA 55 60 70 200 200 200 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 1.4V, VOUT = 18V, VIN = 40mV Overdrive 0.01 0.01 0.8 0.8 µA µA tPD(HL) High-to-Low Propagation Delay VS = 5V, 10mV Input Overdrive, RL = 10k, VOL = 400mV 18 µs tPD(LH) Low-to-High Propagation Delay VS = 5V, 10mV Input Overdrive, RL = 10k, VOH = 0.9 • VS 29 µs tr Output Rise Time VS = 5V, 10mV Input Overdrive, RL = 10k VO = (0.1 to 0.9) • VS 2.2 µs tf Output Fall Time VS = 5V, 10mV Input Overdrive, RL = 10k VO = (0.1 to 0.9) • VS 0.22 µs IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V 5.7 6.5 6.9 7.1 10.0 11.0 12.5 13.0 µA µA µA µA The l denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, (LT6700C-1/LT6700C-2/LT6700C-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER CONDITIONS VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l VTH(F) Falling Input Threshold Voltage (Note 6) MIN TYP MAX UNITS 391.0 392.5 390.0 389.0 409.0 407.5 410.0 411.0 mV mV mV mV 383.5 384.5 382.5 381.5 403.5 402.5 404.5 405.5 mV mV mV mV 6700123fh 4 For more information www.linear.com/LT6700 LT6700/LT6700HV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, (LT6700C-1/LT6700C-2/LT6700C-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER CONDITIONS MIN TYP HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 11 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V VS = 1.4V, 18V, VIN = 0.1V l l l ±15 ±15 ±15 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.5mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV 3 MAX UNITS IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 1.4V, VOUT = 18V, VIN = 40mV Overdrive l l 1 1 µA µA IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 13.0 14.0 15.5 16.0 µA µA µA µA The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, (LT6700I-1/LT6700I-2/LT6700I-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER CONDITIONS MIN VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V HYS HYS = VTH(R) – VTH(F) IB TYP MAX UNITS 390 392 389 388 410 408 411 412 mV mV mV mV l l l l 382.5 383.5 381.5 380.5 404.5 403.5 405.5 406.5 mV mV mV mV VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 2 11.5 mV Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V VS = 1.4V, 18V, VIN = 0.1V l l l ±15 ±15 ±15 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.1mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 1.4V, VOUT = 18V, VIN = 40mV Overdrive l l 1 1 µA µA IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 14.0 15.0 16.5 17.0 µA µA µA µA 6700123fh For more information www.linear.com/LT6700 5 LT6700/LT6700HV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C, (LT6700H-1/LT6700H-2/LT6700H-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER CONDITIONS MIN VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V LT6700H TYP MAX UNITS 390 392 389 388 411 410 412 413 mV mV mV mV l l l l 381.5 382.5 380.5 379.5 405.5 404.5 406.5 407.5 mV mV mV mV 2 HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 13.5 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V VS = 1.4V, 18V, VIN = 100mV l l l ±45 ±45 ±50 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.1mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 1.4V, VOUT = 18V, VIN = 40mV Overdrive l l 1 1 µA µA IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 16.0 17.0 18.5 19.0 µA µA µA µA The l denotes the specifications which apply over the temperature range of –55°C ≤ TA ≤ 125°C, (LT6700MP-1/LT6700MP-2/LT6700MP-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER CONDITIONS MIN VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V LT6700H TYP MAX UNITS 390 392 389 388 411 410 412 413 mV mV mV mV l l l l 381.5 382.5 380.5 379.5 405.5 404.5 406.5 407.5 mV mV mV mV 2 HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 13.5 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V VS = 1.4V, 18V, VIN = 100mV l l l ±45 ±45 ±50 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.1mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV 6700123fh 6 For more information www.linear.com/LT6700 LT6700/LT6700HV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of –55°C ≤ TA ≤ 125°C, (LT6700MP-1/LT6700MP-2/LT6700MP-3) unless otherwise specified (Notes 4, 5). MIN LT6700H TYP SYMBOL PARAMETER CONDITIONS IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 18V, VOUT = 18V, VIN = 40mV Overdrive l l MAX 1 1 UNITS µA µA IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 16.0 17.0 18.5 19.0 µA µA µA µA TA = 25°C, (LT6700HV-1/LT6700HV-2/LT6700HV-3) unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V 394 395 393 392 400 400 400 400 406 405 407 408 mV mV mV mV VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V 386 387 385 384 393.5 393.5 393.5 393.5 401 400 402 403 mV mV mV mV HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing 3.5 6.5 9.5 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V, 36V VS = 1.4V, 18V, VIN = 0.1V ±0.01 ±0.01 ±4 ±10 ±10 ±10 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.5mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA 55 60 70 200 200 200 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 18V, VOUT = 18V, (36V, RL = 100k), VIN = 40mV Overdrive 0.01 0.01 0.8 0.8 µA µA tPD(HL) High-to-Low Propagation Delay VS = 5V, 10mV Input Overdrive, RL = 10k, VOL = 400mV 18 µs tPD(LH) Low-to-High Propagation Delay VS = 5V, 10mV Input Overdrive, RL = 10k, VOH = 0.9 • VS 29 µs tr Output Rise Time VS = 5V, 10mV Input Overdrive, RL = 10k VO = (0.1 to 0.9) • VS 2.2 µs tf Output Fall Time VS = 5V, 10mV Input Overdrive, RL = 10k VO = (0.1 to 0.9) • VS 0.22 µs IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V 5.7 6.5 6.9 7.1 10.0 11.0 12.5 13.0 µA µA µA µA 6700123fh For more information www.linear.com/LT6700 7 LT6700/LT6700HV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, (LT6700HVC-1/LT6700HVC-2/LT6700HVC-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 391.0 392.5 390.0 389.0 409.0 407.5 410.0 411.0 mV mV mV mV VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 383.5 384.5 382.5 381.5 403.5 402.5 404.5 405.5 mV mV mV mV HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 3 11 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V, 36V VS = 1.4V, 18V, VIN = 0.1V l l l ±15 ±15 ±15 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.5mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 18V, VOUT = 18V, (36V, RL = 100k), VIN = 40mV Overdrive l l 1 1 µA µA IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 13.0 14.0 15.5 16.0 µA µA µA µA The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, (LT6700HVI-1/LT6700HVI-2/LT6700HVI-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER MAX UNITS 390 392 389 388 410 408 411 412 mV mV mV mV l l l l 382.5 383.5 381.5 380.5 404.5 403.5 405.5 406.5 mV mV mV mV VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 2 11.5 mV Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V, 36V VS = 1.4V, 18V, VIN = 0.1V l l l ±15 ±15 ±15 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.1mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 18V, VOUT = 18V, (36V, RL = 100k), VIN = 40mV Overdrive l l 1 1 µA µA VTH(R) Rising Input Threshold Voltage (Note 6) VTH(F) Falling Input Threshold Voltage (Note 6) HYS CONDITIONS MIN RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V HYS = VTH(R) – VTH(F) IB TYP 6700123fh 8 For more information www.linear.com/LT6700 LT6700/LT6700HV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, (LT6700HVI-1/LT6700HVI-2/LT6700HVI-3) unless otherwise specified (Notes 4, 5). SYMBOL PARAMETER IS Supply Current CONDITIONS MIN No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l TYP MAX UNITS 14.0 15.0 16.5 17.0 µA µA µA µA The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C, (LT6700HVH-1/LT6700HVH-2/ LT6700HVH-3) unless otherwise specified (Notes 4, 5). CONDITIONS VTH(R) Rising Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 390 392 389 388 411 410 412 413 mV mV mV mV VTH(F) Falling Input Threshold Voltage (Note 6) RL = 100k, VO = 2V Swing VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 381.5 382.5 380.5 379.5 405.5 404.5 406.5 407.5 mV mV mV mV HYS HYS = VTH(R) – VTH(F) VS = 1.4V, 5V, 12V, 18V, RL = 100k, VO = 2V Swing l 2 13.5 mV IB Input Bias Current VS = 1.4V, 18V, VIN = VS VS = 1.4V, VIN = 18V, 36V VS = 1.4V, 18V, VIN = 100mV l l l ±45 ±45 ±50 nA nA nA VOL Output Low Voltage 10mV Input Overdrive VS = 1.4V, IOUT = 0.1mA VS = 1.6V, IOUT = 3mA VS = 5V, IOUT = 5mA l l l 250 250 250 mV mV mV IOFF Output Leakage Current VS = 1.4V, 18V, VOUT = VS, VIN = 40mV Overdrive VS = 18V, VOUT = 18V, (36V, RL = 100k), VIN = 40mV Overdrive l l 1 1 µA µA IS Supply Current No Load Current VS = 1.4V VS = 5V VS = 12V VS = 18V l l l l 16.0 17.0 18.5 19.0 µA µA µA µA Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. Note 3: The inputs are protected by ESD diodes to the ground. If the input voltage exceeds –0.3V below ground, the input current should be limited to less than 10mA. Note 4: The LT6700C-1/-2/-3/LT6700HVC-1/-2/-3, and LT6700I-1/-2/-3/LT6700HVI-1/-2/-3 are guaranteed functional over the operating temperature range of – 40°C to 85°C. The LT6700H-1/-2/-3/ LT6700HVH-1/-2/-3 is guaranteed functional over the operating MIN LT6700H TYP MAX UNITS SYMBOL PARAMETER temperature range of –40°C to 125°C. The LT6700MP-1/-2/-3 is guaranteed functional over the operating temperature range of –55°C to 125°C. Note 5: The LT6700C-1/-2/-3/LT6700HVC-1/-2/-3 is guaranteed to meet the specified performance from 0°C to 70°C. The LT6700C-1/-2/3/LT6700HVC-1/-2/-3 are designed, characterized and expected to meet specified performance from – 40°C to 85°C but are not tested or QA sampled at these temperatures. The LT6700I-1/-2/-3/LT6700HVI-1/-2/-3 is guaranteed to meet specified performance from –40°C to 85°C. The LT6700H-1/-2/-3/LT6700HVH-1/-2/-3 is guaranteed to meet specified performance from –40°C to 125°C.The LT6700MP-1/-2/-3 is guaranteed to meet specified performance from –55°C to 125°C. Note 6: VTH defines the threshold voltage of the comparators and combines the effect of offset and reference accuracy. 6700123fh For more information www.linear.com/LT6700 9 LT6700/LT6700HV PIN FUNCTIONS LT6700-2 LT6700HV-2 LT6700-1 LT6700HV-1 –INB – VS VS VS COMP B –INB – LT6700-3 LT6700HV-3 COMP B +INB OUTB – OUTB + VS – 400mV REFERENCE COMP A + + VS 400mV REFERENCE COMP A OUTA +INA COMP B OUTB + 400mV REFERENCE + – COMP A OUTA OUTA –INA – +INA 6700123 PF01 + 6700123 PF03 6700123 PF02 GND GND GND OUTA: Open-Collector Output of Comparator Section A. This pin provides drive for up to 40mA of load current. Offstate voltage may be as high as 18V (36V for LT6700HV) above GND, regardless of VS used. GND: Ground. This pin is also the low side return of the internal 400mV reference. INA: External Input for Comparator Section A. The voltage on this pin can range from –0.3V to 18V (36V for LT6700HV) with respect to GND regardless of VS used. The input is noninverting for the LT6700-1/LT6700HV-1 and LT6700-3/LT6700HV-3, and inverting for the LT6700-2/ LT6700HV-2. The other section A comparator input is internally connected to the 400mV reference. VS INB: External Input for Comparator Section B. The voltage on this pin can range from –0.3V to 18V (36V for LT6700HV) with respect to GND regardless of VS used. The input is noninverting for the LT6700-3/LT6700HV-3, and inverting for the LT6700-1/LT6700HV-1 and LT6700-2/ LT6700HV-2. The other section B comparator input is internally connected to the 400mV reference. VS: Comparator Core Supply Voltage. The parts are characterized for operation with 1.4V ≤ VS ≤ 18V with respect to GND. OUTB: Open-Collector Output of Comparator Section B. This pin provides drive for up to 40mA of load current. Offstate voltage may be as high as 18V (36V for LT6700HV) above GND, regardless of VS used. 6700123fh 10 For more information www.linear.com/LT6700 LT6700/LT6700HV TYPICAL PERFORMANCE CHARACTERISTICS Distribution of Rising Input Threshold Voltage VS = 5V TA = 25°C 14 12 10 8 6 4 12 10 8 6 4 12 10 8 6 4 2 2 0 0 388 390 392 394 396 398 400 FALLING INPUT THRESHOLD VOLTAGE (mV) 0 394 396 398 400 402 404 406 RISING INPUT THRESHOLD VOLTAGE (mV) #1 402 401 400 #2 #3 399 398 397 #4 Rising Input Threshold Voltage vs Temperature 403.0 402.5 402.0 VS = 1.4V VS = 5V VS = 12V VS = 18V 401.5 401.0 400.5 400.0 399.5 396 –60 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 399.0 –60 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 6700123 G04 6700123 G05 403.0 9 HYSTERESIS (mV) 8 5 8 8.8 TA = 25°C TA = 85°C TA = 125°C TA = –55°C 402.5 402.0 401.5 401.0 400.5 400.0 399.5 399.0 2 8 10 12 14 6 SUPPLY VOLTAGE (V) 4 16 18 6700123 G06 Hysteresis vs Temperature 10 6 5.6 6.4 7.2 HYSTERESIS (mV) Rising Input Threshold Voltage vs Supply Voltage Hysteresis vs Supply Voltage 10 VS = 1.4V VS = 5V VS = 12V VS = 18V TA = 25°C TA = 85°C 9 TA = 125°C TA = –55°C 8 HYSTERESIS (mV) Hysteresis vs Temperature 10 FOUR TYPICAL PARTS 9 VS = 5V #1 #2 8 #3 #4 7 4.8 6700123 G03 RISING INPUT THRESHOLD VOLTAGE (mV) 403 FOUR TYPICAL PARTS VS = 5V 4 6700123 G02 RISING INPUT THRESHOLD VOLTAGE (mV) 404 VS = 5V TA = 25°C 14 2 Rising Input Threshold Voltage vs Temperature RISING INPUT THRESHOLD VOLTAGE (mV) 18 16 14 6700123 G01 HYSTERESIS (mV) Distribution of Hysteresis 20 VS = 5V TA = 25°C 16 PERCENT OF UNITS (%) PERCENT OF UNITS (%) 16 18 PERCENT OF UNITS (%) 18 Distribution of Falling Input Threshold Voltage 7 6 5 7 6 5 4 4 4 3 3 3 2 –60 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2 –60 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2 6700123 G07 6700123 G08 2 4 8 10 12 14 6 SUPPLY VOLTAGE (V) 16 18 6700123 G09 6700123fh For more information www.linear.com/LT6700 11 LT6700/LT6700HV TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Supply Current vs Supply Voltage Minimum Supply Voltage 1 10 –1 –2 –3 TA = 25°C TA = 85°C TA = 125°C TA = –55°C –5 0.9 1.1 1.3 1.7 1.5 SUPPLY VOLTAGE (V) 8 7 6 4 1.4 3.4 5.4 7.4 9.4 11.4 13.4 15.4 17.4 SUPPLY VOLTAGE (V) 0.01 0.1 1 10 OUTPUT SINK CURRENT (mA) 100 10 1 0.001 100 1000 TA = 25°C VS = 1.4V VS = 5V VS = 12V VS = 18V 0.01 0.1 1 10 OUTPUT SINK CURRENT (mA) Below Ground Input Bias Current 10 0 –1 –2 –3 VS = 18V 0V < VIB < 1V TA = 25°C TA = 85°C TA = 125°C TA = –55°C –4 –5 0 6700123 G16 –7 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 INPUT VOLTAGE (V) 100 High Level Input Bias Current 10 1 –6 CURRENT IS GOING OUT OF THE DEVICE –0.2 –0.1 INPUT VOLTAGE (V) 0.01 0.1 1 10 OUTPUT SINK CURRENT (mA) 6700123 G15 CURRENT IS POSITIVE GOING 2 INTO THE DEVICE 100 1 –0.3 10 Low Level Input Bias Current INPUT BIAS CURRENT (nA) INPUT BIAS CURRENT (nA) 1000 100 1 0.001 100 3 VS = 18V –0.3V < VIB < 0V TA = 25°C TA = 85°C TA = 125°C TA = –55°C 1.4 TA = 85°C VS = 1.4V VS = 5V VS = 12V VS = 18V 6700123 G14 6700123 G13 10000 0.4 0.6 0.8 1.0 1.2 SUPPLY VOLTAGE (V) Supply Current vs Output Sink Current SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 1000 10 0.2 0 6700123 G12 Supply Current vs Output Sink Current TA = –40°C VS = 1.4V VS = 5V VS = 12V VS = 18V 1 0.001 0 6700123 G11 Supply Current vs Output Sink Current 100 20 10 6700123 G10 1000 30 5 1.9 TA = 25°C TA = 85°C TA = 125°C TA = –55°C 40 INPUT BIAS CURRENT (nA) –4 TA = 125°C TA = –55°C SUPPLY CURRENT (µA) 9 NO LOAD CURRENT SUPPLY CURRENT (µA) THRESHOLD SHIFT (mV) 0 TA = 25°C TA = 85°C Start-Up Supply Current 50 1 6700123 G17 CURRENT IS GOING INTO THE DEVICE 1 0.1 VS = 18V 0.01 VIB > 1V TA = 25°C TA = 85°C TA = 125°C 0.001 1 3 5 7 9 11 13 INPUT VOLTAGE (V) 15 17 6700123 G18 6700123fh 12 For more information www.linear.com/LT6700 LT6700/LT6700HV TYPICAL PERFORMANCE CHARACTERISTICS 1000 TA = –40°C VS = 1.4V VS = 5V VS = 12V VS = 18V 100 OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (mV) 1000 Output Saturation Voltage vs Output Sink Current 10 1 0.001 0.01 0.1 1 10 OUTPUT SINK CURRENT (mA) 1000 TA = 25°C VS = 1.4V VS = 5V VS = 12V VS = 18V 100 10 1 0.001 100 0.01 0.1 1 10 OUTPUT SINK CURRENT (mA) 6700123 G19 70 50 40 30 0 VS = 5V TA = 25°C TA = 85°C TA = 125°C TA = –55°C 0 2 4 8 10 12 14 6 OUTPUT VOLTAGE (V) 16 50 TA = 25°C VS = 1.4V VS = 5V VS = 12V VS = 18V 40 30 20 10 0 18 0 2 4 8 10 12 14 6 OUTPUT VOLTAGE (V) 16 18 40 30 20 0.1 100 VS = 5V CL = 20pF TA = 25°C 0.01 0.001 0 2 4 6 8 10 12 14 OUTPUT VOLTAGE (V) 16 18 6700123 G24 VO(NINV) 5V/DIV DC VO(INV) 5V/DIV DC 10 RISE 1 VS = 5V TA = 25°C TA = 85°C TA = 125°C TA = –55°C Noninverting and Inverting Comparator Propagation Delay FALL VIN 10mV/DIV AC 0.1 10 0 1 6700123 G23 RISE AND FALL TIME (µs) PROPAGATION DELAY (µs) 50 6700123 G21 Rise and Fall Times vs Output Pull-Up Resistor LH NONINV HL NONINV LH INV HL INV 100 Output Leakage Current 60 Propagation Delay vs Input Overdrive TA = 25°C 0.01 0.1 1 10 OUTPUT SINK CURRENT (mA) 10 6700123 G22 60 10 1 0.001 100 OUTPUT LEAKAGE CURRENT (nA) 70 10 100 Output Short-Circuit Current 80 SHORT-CIRCUIT CURRENT (mA) SHORT-CIRCUIT CURRENT (mA) Output Short-Circuit Current 60 TA = 85°C VS = 1.4V VS = 5V VS = 12V VS = 18V 6700123 G20 80 20 Output Saturation Voltage vs Output Sink Current OUTPUT SATURATION VOLTAGE (mV) Output Saturation Voltage vs Output Sink Current 6700123 G27 0 20 60 80 40 INPUT OVERDRIVE (mV) 100 6700123 G25 0.01 0.1 1 10 100 OUTPUT PULL-UP RESISTOR (kΩ) 1000 VS = 15V 20µs/DIV TA = 25°C RLOAD = 10k CONNNECTED TO VS VIN(OVERDRIVE) = 10mV OVER THE INPUT VOLTAGE THRESHOLDS 6700123 G26 6700123fh For more information www.linear.com/LT6700 13 LT6700/LT6700HV APPLICATIONS INFORMATION The LT6700-1/LT6700-2/LT6700-3/LT6700HV-1/ LT6700HV-2/LT6700HV-3 devices are a family of dual micropower comparators with a built-in 400mV reference. Features include wide supply voltage range (1.4V to 18V), Over-The-Top input and output range, 2% accurate rising input threshold voltage and 6.5mV typical built-in hysteresis. The comparator’s open-collector outputs can sink up to 40mA typical. Internal Reference Each of the comparator sections has one input available externally, with the three versions of the part differing by the polarity of those available inputs (i.e., inverting or noninverting). The other comparator inputs are connected internally to the 400mV reference. The rising input threshold voltage of the comparators is designed to be equal to that of the reference (i.e., ≈ 400mV). The reference voltage is established with respect to the device GND connection. Hysteresis Each comparator has built-in 6.5mV (typical) hysteresis to simplify designs, ensure stable operation in the presence of noise at the inputs, and to reject supply rail noise that might be induced by state change load transients. The hysteresis is designed such that the falling input threshold voltage is nominally 393.5mV. External positive feedback circuitry can be employed with noninverting comparator inputs to increase effective hysteresis if desired, but such circuitry will provide an apparent effect on both the rising and falling input thresholds (the actual internal thresholds remain unaffected). Comparator Inputs A comparator input can swing from ground to 18V (36V for LT6700HV), regardless of the supply voltage used. The typical input current for inputs well above threshold (i.e., >800mV) is a few pA leaking into an input. With decreasing input voltage, a small bias current begins to be drawn out of the input, reaching a few nA when at ground potential. The input may be forced 100mV below ground without causing an improper output, though some additional bias current will begin to flow from the parasitic ESD input protection diode. Inputs driven further negative than 100mV below ground will not cause comparator malfunction or damage (provided the current is limited to 10mA), but the accuracy of the reference cannot be guaranteed, in which case the output state of the alternate comparator may be affected. Comparator Outputs The comparator outputs are open collector and capable of sinking 40mA typical. Load currents are directed out the GND pin of the part. The output off-state voltage may range between –0.3V and 18V (36V for LT6700HV) with respect to ground, regardless of the supply voltage used. When the output high state bias voltage is above 18V, a 100k minimum pull-up resistor is required and total load capacitor must be less than 100nF. If the output high state is above 18V, caution must be taken to prevent a short from the output directly to the bias voltage, even if the output is in the off state. As with any open-collector device, the outputs may be tied together to implement wire-AND logic functions. Power Supplies The comparator family core circuitry operates from a single 1.4V to 18V supply. A minimum 0.1µF bypass capacitor is required between the VS pin and GND. When an output load is connected to the supply rail near the part and the output is sinking more than 5mA, a 1µF bypass capacitor is recommended. The voltage reference built into the LT6700 can be susceptible to high noise on the supply line, particularly noise that is less than 50kHz and larger than 20mVP-P. In order to reduce the probability of a false comparator output in the presence of high supply noise, an RC filter should be used to reduce the noise. This filter can be created simply by adding a series R between the system supply and the LT6700 VS pin, using the decoupling capacitor to create a lowpass response. It is recommended that the filter have a time constant: tRC > VN/100 Where VN is the peak-peak supply noise in millivolts and tRC is milliseconds. This filter will also increase the start-up time of the LT6700 by reducing the rate at which the supply can change. When 6700123fh 14 For more information www.linear.com/LT6700 LT6700/LT6700HV APPLICATIONS INFORMATION using a supply filter, the start-up time of the LT6700 will increase to: tSTART = (0.17ms + 0.25 • tRC) • ΔVS Where tSTART and tRC are in milliseconds and ΔVS is the change in supply in volts. The low supply current of the LT6700 should not cause significant voltage drop due to a 2k maximum series R. Flexible Window Comparator Using the LT6700-1/LT6700HV-1 as shown in the circuits of Figure 1, the wire-AND configuration permits high accuracy window functions to be implemented with a simple 3-resistor voltage divider network. The section A comparator provides the VL trip-point and the section B comparator provides the VH trip-point, with the built-in hysteresis providing about 1.7% recovery level at each trip point to prevent output chatter. For designs that are to be optimized to detect departure from a window limit, the nominal resistor divider values are selected as follows (refer to the resistor designators shown on the first circuit of Figure 1): R1 ≤ 400k (this sets the divider current >> IB of inputs) R2 = R1 • (0.98 • VH /VL – 1) R3 = R1 • (2.5 • VH – 0.98 • VH /VL) To create window functions optimized for detecting entry into a window (i.e., where the output is to indicate a “coming into spec” condition, as with the examples in Figure 1), the nominal resistor values are selected as follows: R1 ≤ 400k (this sets the divider current >> IB of inputs) R2 = R1 • (1.02 • VH /VL – 1) R3 = R1 • (2.54 • VH – 1.02 • VH/VL) The worst-case variance of the trip-points is related to the specified threshold limits of the LT6700/LT6700HV device and the basic tolerance of divider resistors used. For resistor tolerance RTOL (e.g. 0.01 for 1%), the worstcase trip-point voltage (either VH or VL) deviations can be predicted as follows (italicized values are taken from the data sheet, expressed in volts): Max dev VTRIP↑ = ±VTRIPnom • {2 • RTOL • [(VTRIPnom – 0.4) / VTRIPnom] + 1.25 • (VTH(R)max – VTH(R)min)} Max dev VTRIP↓ = ±VTRIPnom • {2 • RTOL • [(VTRIPnom – 0.39) / VTRIPnom] + 1.27 • (VTH(F)max – VTH(F)min)} Generating an External Reference Signal In some applications, it would be advantageous to have access to a signal that is directly related to the internal 400mV reference, even though the reference itself is not available externally. This can be accomplished to a reasonable degree by using an inverting comparator section as a “bang-bang” servo, establishing a nominal voltage, on an integration capacitor, that is scaled to the reference. This method is used in Figure 2, where the reference level has been doubled to drive a resistor bridge. The section B output cycles on and off to swing the section B input between its hysteresis trip points as the load capacitor 3.3V Supply Monitor 3.3V R3 301k 0.1µF R2 6.04k R1 40.2k VS +INA OUTA LT6700-1 –INB OUTB GND 5V Supply Monitor VL 5V VH VOUT 487k 33k VS VOUT HIGH = (3.1V < VS < 3.5V) 0.1µF 6.04k VS +INA OUTA LT6700-1 –INB OUTB 40.2k HYSTERESIS ZONES APPROXIMATELY 2% OF TRIP VOLTAGE 33k GND VOUT HIGH = (4.7V < VS < 5.3V) 6700123 F01 Figure 1. Simple Window Comparator 6700123fh For more information www.linear.com/LT6700 15 LT6700/LT6700HV APPLICATIONS INFORMATION 0.1µF 1.4V TO 18V (IS ≈ 10µA) 2 • VREF RSET 499k LT6700-1 3.3µF RTH –INB OUTB GND T 220k VS +INA OUTA 220k* T < TSET 10k 3.3µF 499k 6700123 F02 RTH = 1M (e.g., YSI 44015, 1.00MΩ AT 25°C) RSET = RTH AT TSET *RESISTANCE MAY REQUIRE OPTIMIZATION FOR OPERATION OVER INTENDED RTH AND VSUPPLY RANGES HYSTERESIS ZONE ≈0.4°C Figure 2. Micropower Thermostat/Temperature Alarm charges and discharges in a shallow, controlled fashion. The multiplied reference signal also contains ripple that is the hysteresis multiplied by the same factor, so additional filtering is performed at the sense node of the bridge to prevent comparator chatter in the section A comparator, which is performing the actual conditional decision for the circuit. Instrumentation Grade Pulse Width Modulator (PWM) Comparators with hysteresis are frequently employed to make simple oscillator structures, and the LT6700/ LT6700HV lends itself nicely to forming a charge-balancing PWM function. The circuit shown in Figure 3 forms a PWM that is intended to transmit an isolated representation of a voltage difference, rather like an isolated instrumentation amplifier. The section B comparator is used to generate a 2V reference supply level for the CMOS NOT gate (inverter), which serves as the precision switch element for the charge balancer. The heart of the charge balancer is the section A comparator, which is detecting slight charge or discharge states on the 0.22µF “integration” capacitor as it remains balanced at ≈400mV by feedback through the NOT gate. The input sense voltage, VIN, is converted to an imbalance current that the NOT gate duty cycle is continually correcting for, thus the digital waveform at the section A comparator output is a PWM representation of VIN with respect to the 2V “full scale.” In this particular circuit, the PWM information drives the LED of an opto-coupler, allowing the VIN information to be coupled across a dielectric barrier. As an additional option to the circuit, the feedback loop can be broken and a second opto-coupler employed to provide the charge balance management. This configuration allows for clocking the comparator output (externally to this circuit) and providing synchronous feedback such that a simple ∆∑ voltage-to-frequency conversion can be formed if desired. Approximately 11-bit accuracy and noise performance was observed in a one second integration period for duty factors from 1% to 99%. 3V/5V 3V NOM (IS < 3mA) Lithium COIN CELL 10k** 750Ω 1 PWM OUT (OR ΔΣ SENSE) 6 MOC-207 22µF NC7S14 VIN 0V TO 2V 0.1µF 470Ω 5 • VREF = 2V + 10k + 412k* 309k* LT6700-1 309k* 0.22µF†† 100k* 100k* 10k VS +INA OUTA –INB OUTB GND 10k 10k 2 5 3V/5V † 0.1µF 750** – 6 1 MOC-207** *1% METAL FILM **DELETE FOR PWM MODE † CONNECT FOR PWM MODE †† OPTIMIZED FOR 2kHz ΔΣ SAMPLING, fPWM(MAX) ≈ 0.6kHz 6700123 F03 5 2 ΔΣ SAMPLE IN Figure 3. Isolated PWM or ∆∑ Converter 6700123fh 16 For more information www.linear.com/LT6700 LT6700/LT6700HV PACKAGE INFORMATION DCB Package 6-Lead Plastic DFN (2mm × 3mm) (Reference LTC DWG # 05-08-1715 Rev A) 0.70 ±0.05 3.55 ±0.05 1.65 ±0.05 (2 SIDES) 2.15 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 1.35 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP R = 0.05 TYP 2.00 ±0.10 (2 SIDES) 3.00 ±0.10 (2 SIDES) 0.40 ± 0.10 4 6 1.65 ± 0.10 (2 SIDES) PIN 1 NOTCH R0.20 OR 0.25 × 45° CHAMFER PIN 1 BAR TOP MARK (SEE NOTE 6) 3 0.200 REF 0.75 ±0.05 1 (DCB6) DFN 0405 0.25 ± 0.05 0.50 BSC 1.35 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (TBD) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 6700123fh For more information www.linear.com/LT6700 17 LT6700/LT6700HV PACKAGE INFORMATION S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 1.90 BSC S6 TSOT-23 0302 REV B 6700123fh 18 For more information www.linear.com/LT6700 LT6700/LT6700HV REVISION HISTORY (Revision history begins at Rev G) REV DATE DESCRIPTION PAGE NUMBER G 5/10 Power Supplies section updated H 6/13 Web hyperlinks added 1-20 Addition of MP grade in SOT23 package 2, 3 Modified part number header for clarity 14 1 to 20 6700123fh Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representaFor more information www.linear.com/LT6700 tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. 19 LT6700/LT6700HV TYPICAL APPLICATIONS PowerPath™ Controller B0520LW “WART” INPUT 3.3V NOM VSUPPLY 1.6V MIN 3V NOM Si2301DS 10k 1k 1M ALKALINE AA CELLS 100k 1M + VS +INA OUTA + VWART > 3.1V LT6700-3 R2 150k VBATT > 2V +INB OUTB GND R1 249k 1µF 6700123 TA04 R1 = 400k/(VBATT AT LOW – 0.4) R2 = 400k/(VBATT AT MAX – 0.4) HYSTERESIS ZONES APPROXIMATELY 2% OF TRIP VOLTAGE PowerPath IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION 48V Status Monitor + 33k 22V CMPZ5251B 1.74M VL LED OFF VH VOUT VIN LED ON 3V/5V VS +INA OUTA 7.87k LT6700-1 –INB OUTB GND VIN HYSTERESIS ZONES APPROXIMATELY 2% OF TRIP VOLTAGE 27k 33k 1 6 0.1µF MOC-207 10k – 5.1V CMPZ5231B VOUT LOW = (39V < VIN < 70V) 2 5 6700123 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1017/LT1018 Micropower Dual Comparator 1.1V (Min) Supply Voltage, ±1.4mV (Max) Input Offset LTC1441/LTC1442 Micropower Dual Comparator with 1% Reference 1.182 ±1% Reference, ±10mV (Max) Input Offset LTC1998 Micropower Comparator for Battery Monitoring 2.5µA Typ Supply Current, Adjustable Threshold and Hysteresis LT6703 Micropower Comparator with 400mV Reference 1.4V to 18V Supply Current, 6.5µA Supply Current 6700123fh 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT6700 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT6700 LT 0613 REV H • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 2003