LT6700IS6-1 [Linear]
Micropower, Low Voltage, SOT-23, Dual Comparator with 400mV Reference; 微功耗,低电压, SOT -23 ,双通道比较有400mV基准型号: | LT6700IS6-1 |
厂家: | Linear |
描述: | Micropower, Low Voltage, SOT-23, Dual Comparator with 400mV Reference |
文件: | 总12页 (文件大小:230K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT6700-1/LT6700-2/LT6700-3
Micropower, Low Voltage,
SOT-23, Dual Comparator
with 400mV Reference
U
FEATURES
DESCRIPTIO
■
Low Quiescent Current: 6.5µA Typ at 5V
The LT®6700-1/LT6700-2/LT6700-3 combine two mi-
cropower, low voltage comparators with a 400mV refer-
enceinthe6-leadSOT-23package.Operatingwithsupplies
from 1.4V up to 18V, the devices draw only 6.5µA typical,
making them ideal for low voltage system monitoring.
Hysteresis is included in the comparators, easing design
requirements to insure stable output operation.
■
Wide Supply Range: 1.4V to 18V
■
400mV Reference ±2% Accuracy Over Temperature
■
Input Range Includes Ground
Over-The-Top® Input Range
■
■
Over-The-Top Open-Collector Outputs
■
Internal Hysteresis: 6.5mV Typ
■
Low Input Bias Current: ±10nA Max
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, independent
of supply voltage. The output stage sinking capability is
guaranteed greater than 5mA over temperature.
■
40mA Typical Output Sink Current
■
Supports Wired-AND Connections
■
Choice of Input Polarities: LT6700-1/LT6700-2/
LT6700-3
Low Profile (1mm) SOT-23 (ThinSOTTM) Package
■
U
The three versions of the part differ by the polarity of the
available comparator inputs. The LT6700-1 has one in-
verting input and one noninverting input, making it suit-
able for use as a window comparator. The LT6700-2 has
two inverting inputs and the LT6700-3 has two noninvert-
ing inputs. All versions are offered in commercial, indus-
trial and automotive temperature ranges.
APPLICATIO S
■
Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
■
■
■
Relay Driving
■
Optoisolator Driving
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology.
ThinSOT is a trademark of Linear Technology Corporation.
Industrial Control Systems
■
Handheld Instruments
U
TYPICAL APPLICATIO
Micropower Battery Monitor
V
BATT
1.4V (MIN)
3V (NOM)
Comparator Thresholds
5
vs Temperature
LT6700-3
1M
1M
1M
406
#1A
#1B
#2A
#2B
4
COMP B
404
402
400
398
396
394
392
390
+
RISING INPUT
6
V
> 1.6V
BATT
–
63.4k
+
+
ALKALINE
AA CELLS
V
S
V
R
= 400mV
REFERENCE
FALLING INPUT
COMP A
–
+
TWO TYPICAL PARTS
COMP A AND B
1
V
BATT
> 2V
V
S
= 5V
3
MONITOR CONSUMES ~10µA
HYSTERESIS IS APPROXIMATELY
2% OF TRIP VOLTAGE
–60 –40 –20
0
20 40 60 80 100 120
0.1µF
261k
TEMPERATURE (°C)
2
6700123 TA02
6700123 TA01
6700123fb
1
LT6700-1/LT6700-2/LT6700-3
W W U W
ABSOLUTE AXI U RATI GS (Note 1)
Total Supply Voltage (VS to GND)........................ 18.5V
Input Voltage (+IN, –IN)
(Note 3) ..................................... 18.5V to (GND – 0.3V)
Output Voltage (OUT) ................ 18.5V to (GND – 0.3V)
Output Short-Circuit Duration (Note 2)........... Indefinite
Input Current (Note 3) ....................................... –10mA
Operating Temperature Range (Note 4)
Specified Temperature Range (Note 5)
LT6700CS6-1/-2/-3 ............................ –40°C to 85°C
LT6700IS6-1/-2/-3 ............................. –40°C to 85°C
LT6700HS6-1/-2/-3 .......................... –40°C to 125°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................... –65°C to 150°
Lead Temperature (Soldering, 10 sec).................. 300°C
LT6700CS6-1/-2/-3 ............................ –40°C to 85°C
LT6700IS6-1/-2/-3 ............................. –40°C to 85°C
LT6700HS6-1/-2/-3 .......................... –40°C to 125°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
TOP VIEW
OUTA 1
GND 2
+INA 3
6 OUTB
5 V
OUTA 1
GND 2
–INA 3
6 OUTB
5 V
OUTA 1
GND 2
+INA 3
6 OUTB
5 V
S
S
S
4 –INB
4 –INB
4 +INB
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 230°C/W
TJMAX = 150°C, θJA = 230°C/W
TJMAX = 150°C, θJA = 230°C/W
ORDER PART
NUMBER
S6 PART
MARKING*
ORDER PART
NUMBER
S6 PART
MARKING*
ORDER PART
NUMBER
S6 PART
MARKING*
LT6700CS6-1
LT6700IS6-1
LT6700HS6-1
LTK7
LT6700CS6-2
LT6700IS6-2
LT6700HS6-2
LTADL
LT6700CS6-3
LT6700IS6-3
LT6700HS6-3
LTADM
*The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
TA = 25°C, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Rising Input Threshold Voltage
R = 100k, V = 2V Swing
TH(R)
L
O
V = 1.4V
394
395
393
392
400
400
400
400
406
405
407
408
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
V
Falling Input Threshold Voltage
R = 100k, V = 2V Swing
L O
TH(F)
V = 1.4V
386
387
385
384
393.5
393.5
393.5
393.5
401
400
402
403
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
HYS
HYS = V
– V
V = 1.4V, 5V, 12V, 18V, R = 100k, V = 2V Swing
3.5
6.5
9.5
mV
TH(R)
TH(F)
S
L
O
6700123fb
2
LT6700-1/LT6700-2/LT6700-3
ELECTRICAL CHARACTERISTICS
TA = 25°C, unless otherwise specified.
CONDITIONS
V = 1.4V, 18V, V = V
SYMBOL
PARAMETER
MIN
TYP
MAX
UNITS
I
Input Bias Current
±0.01
±0.01
±4
±10
±10
±10
nA
nA
nA
B
S
IN
S
V = 1.4V, V = 18V
S
IN
V = 1.4V, 18V, V = 0.1V
S
IN
V
Output Low Voltage
10mV Input Overdrive
OL
V = 1.4V, I
V = 1.6V, I
S
= 0.5mA
= 3mA
55
60
70
200
200
200
mV
mV
mV
S
OUT
OUT
V = 5V, I
= 5mA
S
OUT
I
t
t
t
t
I
Output Leakage Current
High-to-Low Propagation Delay
Low-to-High Propagation Delay
Output Rise Time
V = 1.4V, 18V, V
= V , V = 40mV Overdrive
0.01
0.01
0.8
0.8
µA
µA
OFF
S
OUT
S
IN
V = 1.4V, V
S
= 18V, V = 40mV Overdrive
OUT
IN
V = 5V, 10mV Input Overdrive, R = 10k,
29
µs
µs
µs
µs
PD(HL)
S
L
V
= 400mV
OL
V = 5V, 10mV Input Overdrive, R = 10k,
18
PD(LH)
S
L
V
= 0.9 • V
OH
S
V = 5V, 10mV Input Overdrive, R = 10k
2.2
0.22
r
S
L
V = (0.1 to 0.9) • V
O
S
Output Fall Time
V = 5V, 10mV Input Overdrive, R = 10k
S L
V = (0.1 to 0.9) • V
O
f
S
Supply Current
No Load Current
S
V = 1.4V
5.7
6.5
6.9
7.1
10.0
11.0
12.5
13.0
µA
µA
µA
µA
S
V = 5V
S
V = 12V
S
V = 18V
S
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, unless otherwise specified (Notes 4, 5).
SYMBOL
PARAMETER
CONDITIONS
R = 100k, V = 2V Swing
MIN
TYP
MAX
UNITS
V
Rising Input Threshold Voltage
TH(R)
L
O
V = 1.4V
●
●
●
●
391.0
392.5
390.0
389.0
409.0
407.5
410.0
411.0
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
V
Falling Input Threshold Voltage
R = 100k, V = 2V Swing
L O
TH(F)
V = 1.4V
●
●
●
●
383.5
384.5
382.5
381.5
403.5
402.5
404.5
405.5
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
HYS
HYS = V
– V
V = 1.4V, 5V, 12V, 18V, R = 100k, V = 2V Swing
●
3
11
mV
TH(R)
TH(F)
S
L
O
I
Input Bias Current
V = 1.4V, 18V, V = V
S
●
●
●
±15
±15
±15
nA
nA
nA
B
S
IN
V = 1.4V, V = 18V
S
IN
V = 1.4V, 18V, V = 0.1V
S
IN
V
Output Low Voltage
10mV Input Overdrive
OL
V = 1.4V, I
V = 1.6V, I
S
= 0.5mA
= 3mA
●
●
●
250
250
250
mV
mV
mV
S
OUT
OUT
V = 5V, I
= 5mA
S
OUT
I
I
Output Leakage Current
Supply Current
V = 1.4V, 18V, V
= V , V = 40mV Overdrive
●
●
1
1
µA
µA
OFF
S
S
OUT
S
IN
V = 1.4V, V
S
= 18V, V = 40mV Overdrive
OUT
IN
No Load Current
V = 1.4V
●
●
●
●
13.0
14.0
15.5
16.0
µA
µA
µA
µA
S
V = 5V
S
V = 12V
S
V = 18V
S
6700123fb
3
LT6700-1/LT6700-2/LT6700-3
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of
–40°C ≤ TA ≤ 85°C, unless otherwise specified (Notes 4, 5).
SYMBOL
PARAMETER
CONDITIONS
R = 100k, V = 2V Swing
MIN
TYP
MAX
UNITS
V
TH(R)
Rising Input Threshold Voltage
L
O
V = 1.4V
●
●
●
●
390
392
389
388
410
408
411
412
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
V
TH(F)
Falling Input Threshold Voltage
R = 100k, V = 2V Swing
L O
V = 1.4V
●
●
●
●
382.5
383.5
381.5
380.5
404.5
403.5
405.5
406.5
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
HYS
HYS = V
– V
V = 1.4V, 5V, 12V, 18V, R = 100k, V = 2V Swing
●
2
11.5
mV
TH(R)
TH(F)
S
L
O
I
Input Bias Current
V = 1.4V, 18V, V = V
S
●
●
●
±15
±15
±15
nA
nA
nA
B
S
IN
V = 1.4V, V = 18V
S
IN
V = 1.4V, 18V, V = 0.1V
S
IN
V
OL
Output Low Voltage
10mV Input Overdrive
V = 1.4V, I
= 0.1mA
= 3mA
●
●
●
250
250
250
mV
mV
mV
S
S
OUT
OUT
V = 1.6V, I
V = 5V, I
= 5mA
S
OUT
I
I
Output Leakage Current
Supply Current
V = 1.4V, 18V, V
= V , V = 40mV Overdrive
●
●
1
1
µA
µA
OFF
S
S
OUT
S
IN
V = 1.4V, V
= 18V, V = 40mV Overdrive
IN
S
OUT
No Load Current
V = 1.4V
●
●
●
●
14.0
15.0
16.5
17.0
µA
µA
µA
µA
S
V = 5V
S
V = 12V
S
V = 18V
S
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C, unless otherwise specified (Notes 4, 5).
LT6700H
TYP
SYMBOL
PARAMETER
CONDITIONS
R = 100k, V = 2V Swing
MIN
MAX
UNITS
V
Rising Input Threshold Voltage
TH(R)
L
O
V = 1.4V
●
●
●
●
390
392
389
388
411
410
412
413
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
V
Falling Input Threshold Voltage
R = 100k, V = 2V Swing
L O
TH(F)
V = 1.4V
●
●
●
●
381.5
382.5
380.5
379.5
405.5
404.5
406.5
407.5
mV
mV
mV
mV
S
V = 5V
S
V = 12V
S
V = 18V
S
HYS
HYS = V
– V
V = 1.4V, 5V, 12V, 18V, R = 100k, V = 2V Swing
●
2
13.5
mV
TH(R)
TH(F)
S
L
O
I
Input Bias Current
V = 1.4V, 18V, V = V
S
●
●
●
±45
±45
±50
nA
nA
nA
B
S
IN
V = 1.4V, V = 18V
S
IN
V = 1.4V, 18V, V = 100mV
S
IN
V
Output Low Voltage
10mV Input Overdrive
OL
V = 1.4V, I
= 0.1mA
= 3mA
●
●
●
250
250
250
mV
mV
mV
S
S
OUT
OUT
V = 1.6V, I
V = 5V, I
= 5mA
S
OUT
I
I
Output Leakage Current
Supply Current
V = 1.4V, 18V, V
= V , V = 40mV Overdrive
●
●
1
1
µA
µA
OFF
S
S
OUT
S
IN
V = 1.4V, V
= V , V = 40mV Overdrive
S IN
S
OUT
No Load Current
V = 1.4V
●
●
●
●
16.0
17.0
18.5
19.0
µA
µA
µA
µA
S
V = 5V
S
V = 12V
S
V = 18V
S
6700123fb
4
LT6700-1/LT6700-2/LT6700-3
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those beyond which the life of the
device may be impaired.
LT6700HS6-1/-2/-3 are guaranteed functional over the operating
temperature range of –40°C to 125°C.
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 5: The LT6700CS6-1/-2/-3 are guaranteed to meet the specified
performance from 0°C to 70°C. The LT6700CS6-1/-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
LT6700IS6-1/-2/-3 are guaranteed to meet specified performance from
–40°C to 85°C. The LT6700HS6-1/-2/-3 are guaranteed to meet specified
performance from –40°C to 125°C.
Note 4: The LT6700CS6-1/-2/-3 and LT6700IS6-1/-2/-3 are guaranteed
functional over the operating temperature range of –40°C to 85°C. The
U
U
U
PI FU CTIO S
V
S
V
V
S
S
5
5
5
LT6700-3
LT6700-1
LT6700-2
COMP B
COMP B
COMP B
+INB
4
+
–
–INB
4
–INB
4
–
+
–
6
OUTB
6
OUTB
6
OUTB
+
V
S
V
S
V
S
400mV
REFERENCE
400mV
REFERENCE
400mV
REFERENCE
COMP A
COMP A
COMP A
+
–
–
1
OUTA
1
1
OUTA
OUTA
+
+
+INA
3
+INA
3
–INA
3
–
6700123 PF03
6700123 PF01
6700123 PF02
2
2
2
GND
GND
GND
OUTA (Pin 1): Open-Collector Output of Comparator Sec-
tion A. This pin provides drive for up to 40mA of load
current. Off-state voltage may be as high as 18V above
GND (Pin 2), regardless of VS used.
INB (Pin 4): External Input for Comparator Section B. The
voltage on this pin can range from –0.3V to 18V with
respect to GND (Pin 2) regardless of VS used. The input is
noninverting for the LT6700-3, and inverting for the
LT6700-1 and LT6700-2. The other section B comparator
input is internally connected to the 400mV reference.
GND (Pin 2): Ground. This pin is also the low side return
of the internal 400mV reference.
VS (Pin5):ComparatorCoreSupplyVoltage. Thepartsare
characterized for operation with 1.4V ≤ VS ≤ 18V with
respect to GND (Pin 2).
INA (Pin 3): External Input for Comparator Section A. The
voltage on this pin can range from –0.3V to 18V with
respect to GND (Pin 2) regardless of VS used. The input is
noninverting for the LT6700-1 and LT6700-3, and invert-
ing for the LT6700-2. The other section A comparator
input is internally connected to the 400mV reference.
OUTB (Pin 6): Open-Collector Output of Comparator Sec-
tion B. This pin provides drive for up to 40mA of load
current. Off-state voltage may be as high as 18V above
GND (Pin 2), regardless of VS used.
6700123fb
5
LT6700-1/LT6700-2/LT6700-3
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Distribution of Rising Input
Threshold Voltage
Distribution of Falling Input
Threshold Voltage
Distribution of Hysteresis
18
16
14
12
10
8
20
18
16
14
12
10
8
18
16
14
12
10
8
V
S
T
= 5V
= 25°C
V
= 5V
S
V
T
= 5V
= 25°C
S
T
= 25°C
A
A
A
6
6
6
4
4
4
2
2
2
0
0
0
394
396
398
400
402
404
406
388
390
392
394
396
398
400
4
4.8
5.6
6.4
7.2
8
8.8
RISING INPUT THRESHOLD VOLTAGE (mV)
FALLING INPUT THRESHOLD VOLTAGE (mV)
HYSTERESIS (mV)
6700123 G01
6700123 G02
6700123 G03
Rising Input Threshold Voltage
vs Temperature
Rising Input Threshold Voltage
vs Temperature
Rising Input Threshold Voltage
vs Supply Voltage
404
403
402
401
400
399
398
397
396
403.0
402.5
402.0
401.5
401.0
400.5
400.0
399.5
399.0
403.0
402.5
402.0
401.5
401.0
400.5
400.0
399.5
399.0
V
V
V
V
= 1.4V
= 5V
= 12V
= 18V
T
A
T
A
T
A
T
A
= 25°C
= 85°C
= 125°C
= –55°C
FOUR TYPICAL PARTS
S
S
S
S
S
V
= 5V
#1
#2
#3
#4
0
20 40 60 80
0
20 40 60 80
8
10 12
–60 –40 –20
100 120
–60 –40 –20
100 120
2
4
6
14 16 18
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
6700123 G04
6700123 G05
6700123 G06
Hysteresis vs Temperature
Hysteresis vs Temperature
Hysteresis vs Supply Voltage
10
9
10
9
10
9
T
A
T
A
= 25°C
= 85°C
T
T
= 125°C
= –55°C
V
S
V
S
V
S
V
S
= 1.4V
= 5V
= 12V
= 18V
FOUR TYPICAL PARTS
S
A
A
V
= 5V
#1
#2
#3
#4
8
8
8
7
7
7
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
0
20 40 60 80
0
20 40 60 80
8
10 12
–60 –40 –20
100 120
–60 –40 –20
100 120
2
4
6
14 16 18
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
6700123 G07
6700123 G08
6700123 G09
6700123fb
6
LT6700-1/LT6700-2/LT6700-3
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Supply Current
vs Supply Voltage
Minimum Supply Voltage
Start-Up Supply Current
1
0
50
40
30
20
10
0
10
9
T
T
= 25°C
= 85°C
T
T
= 125°C
= –55°C
T
T
T
T
= 25°C
= 85°C
= 125°C
= –55°C
A
A
A
A
A
A
A
A
NO LOAD CURRENT
–1
–2
–3
–4
–5
8
7
6
T
= 25°C
= 85°C
= 125°C
= –55°C
A
A
A
A
T
T
T
5
4
0.9
1.1
1.3
1.5
1.7
1.9
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
SUPPLY VOLTAGE (V)
6700123 G12
7.4 9.4 11.4
1.4 3.4 5.4
13.4 15.4 17.4
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
6700123 G10
6700123 G11
Supply Current
vs Output Sink Current
Supply Current
vs Output Sink Current
Supply Current
vs Output Sink Current
1000
100
10
1000
100
10
1000
100
10
T
= –40°C
T
= 25°C
T
= 85°C
A
A
A
V
V
V
V
= 1.4V
V
= 1.4V
= 5V
= 12V
= 18V
V
= 1.4V
= 5V
= 12V
= 18V
S
S
S
S
S
S
= 5V
= 12V
= 18V
V
V
V
V
V
V
S
S
S
S
S
S
1
1
1
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT (mA)
6700123 G13
6700123 G14
6700123 G15
Below Ground Input Bias Current
Low Level Input Bias Current
High Level Input Bias Current
3
2
10000
1000
100
10
10
1
V
= 18V
CURRENT IS POSITIVE GOING
INTO THE DEVICE
S
CURRENT IS GOING INTO THE DEVICE
–0.3V < V < 0V
IB
T
T
T
T
= 25°C
= 85°C
= 125°C
= –55°C
A
A
A
A
1
0
–1
–2
–3
–4
–5
–6
–7
0.1
V
= 18V
IB
S
0V < V < 1V
V
V
= 18V
> 1V
S
IB
T
A
T
A
T
A
T
A
= 25°C
= 85°C
= 125°C
= –55°C
0.01
0.001
T
T
T
= 25°C
= 85°C
= 125°C
A
A
A
CURRENT IS GOING OUT OF THE DEVICE
–0.2 –0.1
INPUT VOLTAGE (V)
1
0.5 0.8 0.9
0.6 0.7
1
0
0.4
–0.3
0
0.1 0.2 0.3
1
3
5
7
9
11 13 15 17
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
6700123 G16
6700123 G18
6700123 G17
6700123fb
7
LT6700-1/LT6700-2/LT6700-3
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Saturation Voltage
vs Output Sink Current
Output Saturation Voltage
vs Output Sink Current
Output Saturation Voltage
vs Output Sink Current
1000
100
10
1000
100
10
1000
100
10
T
= –40°C
T
= 25°C
T
= 85°C
A
A
A
V
V
V
V
= 1.4V
V
= 1.4V
= 5V
V
= 1.4V
= 5V
S
S
S
S
S
S
= 5V
= 12V
= 18V
V
V
V
V
V
V
S
S
S
S
S
S
= 12V
= 18V
= 12V
= 18V
1
1
1
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT (mA)
6700123 G19
6700123 G20
6700123 G21
Output Short-Circuit Current
Output Short-Circuit Current
Output Leakage Current
10
1
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
T
A
= 25°C
V
S
V
S
V
S
V
S
= 1.4V
= 5V
= 12V
= 18V
0.1
0.01
V
= 5V
S
T
= 25°C
= 85°C
= 125°C
= –55°C
A
A
A
A
T
T
T
V
S
= 5V
T
= 25°C
= 85°C
= 125°C
= –55°C
A
A
A
A
T
T
T
0.001
8
10 12
8
10 12
0
2
4
6
14 16 18
0
2
4
6
14 16 18
0
2
4
6
8
10 12 14 16 18
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
6700123 G24
6700123 G22
6700123 G23
Propagation Delay
vs Input Overdrive
Rise and Fall Times
vs Output Pull-Up Resistor
Noninverting and Inverting
Comparators’ Propagation Delay
100
10
60
50
40
30
20
10
0
V
C
T
= 5V
= 20pF
= 25°C
LH NONINV
HL NONINV
LH INV
S
L
A
T
= 25°C
A
VO(NINV)
5V/DIV
DC
VO(INV)
5V/DIV
DC
HL INV
RISE
FALL
1
VIN
10mV/DIV
AC
0.1
0.01
VS = 5V
TA = 25°C
20µs/DIV
67000123 G27
RLOAD = 10k CONNECTED TO VS
VIN(OVERDRIVE) = 10mV OVER THE INPUT
VOLTAGE THRESHOLDS
0.1
1
10
100
1000
0
20
40
60
80
100
OUTPUT PULL-UP RESISTOR (kΩ)
INPUT OVERDRIVE (mV)
6700123 G26
6700123 G25
6700123fb
8
LT6700-1/LT6700-2/LT6700-3
W U U
APPLICATIO S I FOR ATIO
U
TheLT6700-1/LT6700-2/LT6700-3devicesareafamilyof
dual micropower comparators with a built-in 400mV ref-
erence. Features include wide supply voltage range (1.4V
to 18V), Over-The-Top input and output range, 2% accu-
raterisinginputthreshold voltage and 6.5mVtypicalbuilt-
in hysteresis. The comparator’s open-collector outputs
can sink up to 40mA typical.
(providedthecurrentislimitedto10mA), buttheaccuracy
of the reference cannot be guaranteed, in which case the
output state of the alternate comparator may be effected.
Comparator Outputs
The comparator outputs are open collector and capable of
sinking 40mA typical. Load currents are directed out the
GNDpinofthepart.Theoutputoff-statevoltagemayrange
between–0.3Vand18Vwithrespecttoground,regardless
of the supply voltage used. As with any open-collector
device, the outputs may be tied together to implement
wire-AND logic functions.
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).Theothercomparatorinputsareconnected
internally to the 400mV reference. The rising input thresh-
old voltage of the comparators is designed to be equal to
thatofthereference(i.e., ≈400mV). Thereferencevoltage
is established with respect to the device GND connection.
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. In instances where the supply
is relatively “soft” (such as with small batteries) and
susceptible to load steps, an additional 47Ω series de-
coupling resistor can further improve isolation of supply
transients from the VS pin.
Hysteresis
Eachcomparatorhasbuilt-in6.5mV(typical)hysteresisto
simplify designs, insure 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
hysteresisisdesignedsuchthatthefallinginputthreshold
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).
Flexible Window Comparator
Using the LT6700-1 as shown in the circuits of Figure 1,
the wire-AND configuration permits high accuracy win-
dow functions to be implemented with a simple 3-resistor
voltage divider network. The section A comparator pro-
vides 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.
Comparator Inputs
A comparator input can swing from ground to 18V,
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
inputmaybeforced100mVbelowgroundwithoutcausing
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
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)
6700123fb
9
LT6700-1/LT6700-2/LT6700-3
W U U
U
APPLICATIO S I FOR ATIO
3.3V Supply Monitor
5V Supply Monitor
3.3V
5V
V
V
H
L
V
R3
5
OUT
5
487k
301k
V
V
S
S
3
4
1
6
3
4
1
6
33k
33k
+INA OUTA
+INA OUTA
LT6700-1
R2
6.04k
V
S
LT6700-1
6.04k
40.2k
V
V
OUT
OUT
–INB OUTB
GND
–INB OUTB
GND
HIGH = (3.1V < V < 3.5V)
S
HIGH = (4.7V < V < 5.3V)
S
R1
40.2k
0.1µF
0.1µF
2
2
HYSTERESIS ZONES
APPROXIMATELY
2% OF TRIP VOLTAGE
6700123 F01
Figure 1. Simple Window Comparator
0.1µF
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:
1.4V TO 18V
(I ≈ 10µA)
2 • V
S
REF
5
R
499k
499k
220k 220k*
T < T
SET
V
S
3
4
1
6
+INA OUTA
LT6700-1
SET
10k
–INB OUTB
GND
R1 ≤ 400k (this sets the divider current >> IB of inputs)
R2 = R1 • (1.02 • VH/VL – 1)
R
TH
3.3µF
3.3µF
T
2
6700123 F02
R3 = R1 • (2.54 • VH – 1.02 • VH/VL)
R
R
= 1M (e.g., YSI 44015, 1.00MΩ AT 25°C)
TH
= R AT T
SET
TH
SET
The worst-case variance of the trip-points is related to the
specified threshold limits of the LT6700 device and the
basic tolerance of divider resistors used. For resistor
tolerance RTOL (e.g. 0.01 for 1%), the worst-case trip-
point voltage (either VH or VL) deviations can be predicted
as follows (italicized values are taken from the datasheet,
expressed in volts):
*RESISTANCE MAY REQUIRE OPTIMIZATION FOR OPERATION
OVER INTENDED R AND V
HYSTERESIS ZONE ≈0.4°C
RANGES
TH
SUPPLY
Figure 2. Micropower Thermostat/Temperature Alarm
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
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.
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
availableexternally.Thiscanbeaccomplishedtoareason-
able 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
Instrumentation Grade Pulse Width Modulator (PWM)
Comparators with hysteresis are frequently employed to
make simple oscillator structures, and the LT6700 lends
itself nicely to forming a charge-balancing PWM function.
ThecircuitshowninFigure3formsaPWMthatisintended
to transmit an isolated representation of a voltage differ-
6700123fb
10
LT6700-1/LT6700-2/LT6700-3
W U U
APPLICATIO S I FOR ATIO
U
ence, ratherlikeanisolatedinstrumentationamplifier. 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 correct-
ing for, thus the digital waveform at the section A com-
paratoroutputisaPWMrepresentationofVIN withrespect
to the 2V “full scale.” In this particular circuit, the PWM
informationdrivestheLEDofanoptocoupler, allowingthe
VIN information to be coupled across a dielectric barrier.
Asanadditionaloptiontothecircuit,thefeedbackloopcan
be broken and a second optocoupler employed to provide
the charge balance management. This configuration al-
lows for clocking the comparator output (externally to this
circuit) and providing synchronous feedback such that a
simple∆Σvoltage-to-frequencyconversioncanbeformed
if desired. Approximately 11-bit accuracy and noise per-
formancewasobservedinaonesecondintegrationperiod
for duty factors from 1% to 99%.
W U U
U
APPLICATIO S I FOR ATIO
3V/5V
3V NOM (I < 3mA)
S
10k
+
Lithium
COIN CELL
0.1µF
750Ω
PWM OUT
10k**
(OR ∆Σ SENSE)
1
2
6
470Ω
5 • V
= 2V
REF
MOC-207
5
22µF
412k*
10k 10k
V
NC7S14
309k*
S
309k*
††
3
1
5
+INA OUTA
LT6700-1
10k
6
3V/5V
750**
4
†
+
–INB OUTB
GND
V
IN
0.22µF
0.1µF
100k* 100k*
0V TO 2V
2
6
1
–
MOC-207**
6700123 F03
*1% METAL FILM
5
2
**DELETE FOR PWM MODE
†
∆Σ
SAMPLE
IN
CONNECT FOR PWM MODE
††
OPTIMIZED FOR 2kHz ∆Σ SAMPLING, f
≈ 0.6kHz
PWM(MAX)
Figure 3. Isolated PWM or ∆Σ Converter
6700123fb
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT6700-1/LT6700-2/LT6700-3
U
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.4 MIN
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
1.50 – 1.75
(NOTE 4)
2.80 BSC
3.85 MAX 2.62 REF
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
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
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302
U
TYPICAL APPLICATIO S
PowerPathTM Controller
48V Status Monitor
B0520LW
+
V
SUPPLY
“WART” INPUT
1.6V MIN
3V NOM
33k
22V
CMPZ5251B
3.3V NOM
Si2301DS
1.74M
7.87k
5
10k
V
H
V
L
3V/5V
V
S
LED OFF
3
4
1
6
+INA OUTA
V
OUT
V
1k
100k
LT6700-1
27k
33k
IN
V
OUT
LOW = (39V < V < 70V)
1M
R2
1M
R1
–INB OUTB
GND
LED ON
IN
1
6
V
IN
+
+
5
2
HYSTERESIS ZONES
APPROXIMATELY
2% OF TRIP VOLTAGE
ALKALINE
AA CELLS
0.1µF
V
S
MOC-207
3
4
1
6
10k
+INA OUTA
V
V
> 3.1V
> 2V
WART
LT6700-3
2
5
5.1V
CMPZ5231B
+INB OUTB
GND
BATT
6700123 TA03
–
1µF
150k 249k
2
6700123 TA04
R1 = 400k/(V
R2 = 400k/(V
AT LOW – 0.4)
AT MAX – 0.4)
BATT
BATT
HYSTERESIS ZONES APPROXIMATELY 2% OF TRIP VOLTAGE
PowerPath IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION
RELATED PARTS
PART NUMBER
LT1017/LT1018
LTC1441/LTC1442
LTC1998
DESCRIPTION
COMMENTS
Micropower Dual Comparator
1.1V (Min) Supply Voltage, ±1.4mV (Max) Input Offset
1.182 ±1% Reference, ±10mV (Max) Input Offset
Micropower Dual Comparator with 1% Reference
Micropower Comparator for Battery Monitoring
2.5µA Typ Supply Current, Adjustable Threshold and Hysteresis
6700123fb
LT/TP 0104 1K • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2003
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