LT6700/LT6700HV
Micropower, Low Voltage,
Dual Comparator with
400mV Reference
DESCRIPTION
FEATURES
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Internal 400mV Reference
Total Threshold Error: ±1.25% Max at 25°C
Inputs and Outputs Operate to 36V
Wide Supply Range: 1.4V to 18V
Specified for –55°C to 125°C Temperature Range
Low Quiescent Current: 6.5µA Typ at 5V
Internal Hysteresis: 6.5mV Typ
Low Input Bias Current: ±10nA Max
Over-The-Top® Input also Includes Ground
Open-Collector Outputs Allow Level Translation
Choice of Input Polarities: LT6700-1/LT6700-2/
LT6700-3/LT6700HV-1/LT6700HV-2/LT6700HV-3
Available in Low Profile (1mm) SOT-23 (ThinSOT™)
and 2mm × 3mm DFN Packages
APPLICATIONS
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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.
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.
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.
Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Relay Driving
Industrial Control Systems
Handheld Instruments
Automotive Monitor and Controls
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
TA = 25°C, (LT6700-1/LT6700-2/LT6700-3) 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
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