Page 1
Single 0.275% Comparator and Reference
V
www.BDTIC.com/ADI
FEATURES
400 mV ± 0.275% threshold
Supply range: 1.7 V to 5.5 V
Low quiescent current: 6.5 μA typical
Input range includes ground
Internal hysteresis: 9.3 mV typical
Low input bias current: ±5 nA maximum
Dual open-drain outputs
Small SOT-23 package
APPLICATIONS
Li-Ion monitoring
Threshold detectors
Relay driving
Optoisolator driving
Industrial control systems
Handheld instruments
GENERAL DESCRIPTION
The ADCMP361 is a single low power, high accuracy comparator with a 400 mV reference in a 5-lead SOT-23 package. The
internal 400 mV reference provides the ability to monitor low
voltage supplies. The device operates on a supply voltage from
1.7 V to 5.5 V and only draws 6.5 μA typical, making it suitable
for low power system monitoring and portable applications.
Hysteresis is included in the comparators.
There are dual open-drain outputs to enable the comparator
an
d reference circuit to be used in an inverting or noninverting
configuration. The outputs can be pulled to any voltage up to a
maximum of 5.5 V. The output stage is guaranteed to sink greater
than 5 mA over temperature
The device is suitable for portable, commercial, industrial, and
au
tomotive applications.
with Dual Polarity Outputs
ADCMP361
FUNCTIONAL BLOCK DIAGRAM
DD
ADCMP361
IN
400mV
GND
Figure 1.
R1
4.7MΩ
IN
3V
Li-Ion
CELL
+
R2
1MΩ
C1
100nF
Figure 2. Typical Li-Ion Monitoring Application
+
–
DISCHARGING
V
BATT
2.280V
2.271V
V
DD
400mV
GND
OUT
OUT
06496-001
ADCMP361
OUT
OUT
CHARGING
R3
1MΩ
06496-029
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
V
OUT
Figure 3. Li-Ion Monitoring Waveforms
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
06496-030
Page 2
ADCMP361
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Characteristics .............................................................. 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
REVISION HISTORY
2/07—Revision 0: Initial Version
Typical Performance Characteristics..............................................6
Application Information................................................................ 11
Comparators and Internal Reference ...................................... 11
Power Supply............................................................................... 11
Inputs........................................................................................... 11
Outputs........................................................................................ 11
Adding Hysteresis....................................................................... 11
Outline Dimensions....................................................................... 12
Ordering Guide .......................................................................... 12
Rev. 0 | Page 2 of 12
Page 3
ADCMP361
www.BDTIC.com/ADI
SPECIFICATIONS
VDD = 1.7 V to 5.5 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
THRESHOLDS
Rising Input Threshold Voltage 399.3 400.4 401.5 mV VDD = 3.3 V, TA = 25°C
391.2 400.4 407.7 mV VDD = 1.7 V
393.1 400.4 405.9 mV VDD = 3.3 V
393.1 400.4 405.8 mV VDD = 5.5 V
Falling Input Threshold Voltage 381.1 391.1 400.9 mV VDD = 1.7 V
381.2 391.1 398.4 mV VDD = 3.3 V
381.0 391.1 398.2 mV VDD = 5.5 V
Hysteresis = V
Threshold Voltage Accuracy ±0.275 % TA = 25°C, VDD = 3.3 V
Threshold Voltage Temperature Coefficient 16 ppm/°C
POWER SUPPLY
Supply Current 6.5 9 μA VDD = 1.7 V
7.0 10 μA VDD = 5.5 V
INPUT CHARACTERISTICS
Input Bias Current 0.01 5 nA VDD = 1.7 V, VIN = VDD
0.01 5 nA VDD = 1.7 V, VIN = 0.1 V
OPEN-DRAIN OUTPUTS
Output Low Voltage
140 220 mV VDD = 5.5 V, I
Output Leakage Current
0.01 1 μA VDD = 1.7 V, V
DYNAMIC PERFORMANCE
High-to-Low Propagation Delay
Low-to-High Propagation Delay
Output Rise time
Output Fall time
1
RL = 100 kΩ, VO = 2 V swing.
2
10 mV input overdrive.
3
VIN = 40 mV overdrive.
4
RL = 10 kΩ.
1
– V
TH(R)
2 9.3 13.5 mV
TH(F)
2
3
2, 4
10 μs VDD = 5 V, VOL = 400 mV
2, 4
2, 4
2, 4
140 220 mV VDD = 1.7 V, I
0.01 1 μA VDD = 1.7 V, V
= 3 mA
OUT
= 5 mA
OUT
= VDD
OUT
OUT
= 5.5 V
8 μs VDD = 5 V, VOH = 0.9 × VDD
0.5 μs VDD = 5 V, VO = (0.1 to 0.9) × VDD
0.07 μs VDD = 5 V, VO = (0.1 to 0.9) × VDD
Rev. 0 | Page 3 of 12
Page 4
ADCMP361
www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VDD −0.3 V to +6 V
IN −0.3 V to +6 V
OUT, OUT
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Lead Temperature
Soldering (10 sec) 300°C
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
Stresses above those listed under Absolute Maximum Ratings
y cause permanent damage to the device. This is a stress
ma
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
−0.3 V to +6 V
THERMAL CHARACTERISTICS
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type θJA Unit
5-Lead SOT-23 240 °C/W
ESD CAUTION
Rev. 0 | Page 4 of 12
Page 5
ADCMP361
www.BDTIC.com/ADI
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
OUT
GND
IN
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 OUT Noninverting Open-Drain Output.
2 GND Ground.
3 IN
Monitors analog input voltage on comparator. The other input of the c
reference.
4 VDD Power Supply.
5
OUT
Inverting Open-Drain Output.
1
ADCMP361
2
TOP VIEW
(Not to Scale)
3
Figure 4. Pin Configuration
5
OUT
4
V
DD
06496-002
omparator is connected to a 400 mV
Rev. 0 | Page 5 of 12
Page 6
ADCMP361
www.BDTIC.com/ADI
TYPICAL PERFORMANCE CHARACTERISTICS
60
50
VDD = 5V
= 25°C
T
A
50
40
VDD = 5V
= 25°C
T
A
40
30
20
PERCENT OF UNI TS (%)
10
0
394 395 396 397 398 399 400 401 402 403 404 405 406
RISING INPUT THRESHOL D VOLTAG E (mV)
Figure 5. Distribution of Rising Input Threshold Voltage
35
VDD = 5V
= 25°C
T
A
30
25
20
15
10
PERCENT OF UNI TS (%)
5
0
6.0 6.4 6.8 7.2 7.6 8.0 8.4 8.8 9.2 9.6 10.0 10.4 10.8
HYSTERESIS (mV)
Figure 6. Distribution of Hysteresis
30
20
PERCENT OF UNI TS (%)
10
0
388 389 390 391 392 393 394 395 396 397 398 399 400
6496-003
FALLING INPUT THRESHOLD VOLTAGE (mV)
06496-006
Figure 8. Distribution of Falling Input Threshold Voltage
404
402
400
398
RISING INPUT THRESHOLD VOLTAGE (mV)
396
6496-004
1
2
3
4
–40 –20 1200 20406080100
TEMPERATURE (° C)
FOUR TYPI CAL PARTS
V
= 5V
DD
06496-005
Figure 9. Rising Input Threshold Voltage vs. Temperature
401
TA = –40°C
400
T
= +25°C
A
T
= +85°C
A
T
= +125°C
A
SUPPLY VOLTAGE (V)
06496-007
RISING INPUT THRESHOLD VO LTAGE (mV)
399
398
397
396
395
1.7 5.75.24.74.23.73.22.72.2
Figure 7. Rising Input Threshold Voltage vs. Supply Voltage
Rev. 0 | Page 6 of 12
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
7.5
7.0
HYSTERESIS (mV)
6.5
6.0
5.5
5.0
4.5
4.0
VDD = 1.8V
VDD = 2.5V
VDD = 3.3V
VDD = 5.0V
–40 –20 1200 20406080100
TEMPERATURE (° C)
Figure 10. Hysteresis vs. Temperature
6496-010
Page 7
ADCMP361
www.BDTIC.com/ADI
12
11
10
9
8
TA = +125°C
T
= +25°C
A
T
= +85°C
A
1
0
–1
–2
TA = –40°C
TA = +25°C
TA = +85°C
TA = +125°C
HYSTERESIS (mV)
7
6
5
4
1.7 5.75.24.74.23.73.22.72.2
SUPPLY VOLTAGE (V)
= –40°C
T
A
Figure 11. Hysteresis vs. Supply Voltage
10
NO LOAD CURRENT
9
8
T
= +85°C
A
7
6
SUPPLY CURRENT (mA)
5
4
1.72.22.73.23.74.24.7
= –40°C
T
A
SUPPLY VOLTAGE (V)
TA = +125°C
= +25°C
T
A
Figure 12. Quiescent Supply Current vs. Supply Voltage
5.2
–3
THRESHOLD SHIFT (mV)
–4
–5
1.5 2.52.42.32.22.12.01.91.81.71.6
6496-008
SUPPLY VOLTAGE (V)
06496-011
Figure 14. Minimum Supply Voltage
50
40
30
20
SUPPLY CURRENT (µA)
10
0
00.51.0
06496-009
T
TA = +125°C
SUPPLY VOLTAGE (V)
= +85°C
A
T
= +25°C
A
T
A
= –40°C
1.5
06496-012
Figure 15. Start-Up Supply Current
1000
TA = –40°C
100
10
SUPPLY CURRENT (µA)
1
0.001 1001010.10.01
OUTPUT SI NK CURRENT (mA)
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.7V
6496-013
Figure 13. Supply Current vs. Output Sink Current
Rev. 0 | Page 7 of 12
1000
TA = 25°C
100
10
SUPPLY CURRENT (µA)
1
0.001 1001010.10.01
OUTPUT SI NK CURRENT (mA)
Figure 16. Supply Current vs. Output Sink Current
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.7V
06496-014
Page 8
ADCMP361
www.BDTIC.com/ADI
1000
TA = 85°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.7V
10k
CURRENT IS GOING
TA = +125°C
1k
OUT OF THE DEVICE.
V
= 5V
DD
–0.3V < V
IB
< 0V
100
10
SUPPLY CURRENT (µ A)
1
0.001 1001010.10.01
OUTPUT SI NK CURRENT (mA)
Figure 17. Supply Current vs. Output Sink Current
3
1
–1
–3
INPUT BIAS CURRENT (nA)
–5
CURRENT IS POSITIVE
GOING INTO THE DEVICE.
V
= 5V
DD
0V < V
< 1V
–7
IB
00.2 0.6
0.4 0.8
INPUT VOLTAGE (V)
Figure 18. Low Level Inpu t Bias Cur rent
TA = +125°C
TA = +85°C
TA = +25°C
TA = –40°C
1.0
100
= +85°C
T
T
= +25°C
A
10
INPUT BIAS CURRENT (nA)
1
0.1
–0.3 –0.2 –0.1
06496-015
A
T
= –40°C
A
INPUT VOLTAGE (V)
0
06496-016
Figure 20. Below Ground Input Bias Current
10
TA = +125°C
1
TA = +85°C
= 5V
> 1V
TA = +25°C
INPUT VOLTAG E (V)
0.1
INPUT BIAS CURRENT (nA)
CURRENT IS GO ING INTO THE DEVICE
V
DD
V
IB
0.01
12 4
06496-017
TA = –40°C
3
5
06496-018
Figure 21. High Level Input Bias Current
1000
TA = 25°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
100
OUTPUT SATURATION VOLTAGE (mV)
VDD = 1.8V
10
1
0.001 0.10.01
OUTPUT SI NK CURRENT (mA)
101
Figure 19. Output Saturation Voltage vs. Output Sink Current
6496-019
Rev. 0 | Page 8 of 12
1000
= –40°C
T
A
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
100
10
OUTPUT SATURATION VOLTAGE (mV)
1
0.001 0.1
OUTPUT SI NK CURRENT (mA)
100.01 1
Figure 22. Output Saturation Voltage vs. Output Sink Current
06496-020
Page 9
ADCMP361
www.BDTIC.com/ADI
1000
100
TA = 85°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
= 5V
V
DD
70
60
50
40
T
= +25°C
A
T
= +85°C
A
T
= –40°C
A
TA = +125°C
10
OUTPUT SATURATION VOLTAGE (mV)
1
0.001 0.1
OUTPUT SI NK CURRENT (mA)
100.01 1
Figure 23. Output Saturation Voltage vs. Output Sink Current
TA = 25°C
60
50
40
30
20
SHORT-CIRCUIT CURRENT (mA)
10
0
02704
OUTPUT VO LTAGE (V )
VDD = 5.0V
= 3.3V
V
DD
V
= 2.5V
DD
V
= 1.8V
DD
Figure 24. Short-Circuit Current vs. Output Voltage
30
20
SHORT-CIRCUIT CURRENT (mA)
10
0
02804
06496-021
OUTPUT VO LTAGE (V )
6496-022
Figure 26. Short-Circuit Current vs. Output Voltage
VDD = 5V
TA = +125°C
1
T
= +85°C
A
T
= +25°C
0.1
0.01
OUTPUT LEAKAGE CURRENT (nA)
0.001
01231045
06496-023
OUTPUT VOLTAGE (V)
A
T
= –40°C
A
06496-024
Figure 27. Output Leakage Current vs. Output Voltage
60
TA = 25°C
50
40
30
20
PROPAGATION DELAY (µs)
10
0
0 204060
INPUT OVERDRI VE (mV)
Figure 25. Propagation Delay vs. Input Overdrive
LH NONINV
LH INV
HL NONINV
HL INV
80 100
6496-025
Rev. 0 | Page 9 of 12
100
VDD = 5V
C
= 20pF
L
T
= 25°C
A
10
RISE
1
0.1
RISE AND FALL TIMES (µs)
FALL
0.01
0.1 1
OUTPUT PULL-UP RESISTOR (kΩ)
10
100 1000
Figure 28. Rise and Fall Times vs. Output Pull-Up Resistor
06496-027
Page 10
ADCMP361
www.BDTIC.com/ADI
NON INV (OUT A)
2
INV (OUTB)
3
VIN (+INA, –INB)
1
CH1 50.0mV
CH3 5.00V
Figure 29. Noninverting and Inverting Comparators Propagation Delay
CH2 5.00V M20.0µs CH1 7mV
06496-026
Rev. 0 | Page 10 of 12
Page 11
ADCMP361
V
www.BDTIC.com/ADI
APPLICATION INFORMATION
The ADCMP361 is a low power comparator and reference
circuit featuring a 400 mV reference that operates from 1.7 V
to 5.5 V. The comparator is 0.275% accurate with a built-in
hysteresis of 9.3 mV. There are two outputs, one the inverse
of the other. This enables the ADCMP361 to be used as an
inverting or a noninverting comparator circuit. These opendrain outputs are capable of sinking 40 mA.
COMPARATORS AND INTERNAL REFERENCE
The comparator has one input available externally; the other
comparator input is connected internally to the 400 mV reference.
The rising input threshold voltage of the comparators is designed
to be equal to that of the reference.
POWER SUPPLY
The ADCMP361 is designed to operate from 1.7 V to 5.5 V.
A 100 nF decoupling capacitor is recommended between V
and GND.
DD
OUTPUTS
The open-drain comparator outputs are limited to the
maximum specified V
V
voltage. These outputs are capable of sinking up 40 mA.
DD
voltage range, regardless of the
DD
ADDING HYSTERESIS
To prevent oscillations at the output caused by noise or slowly
moving signals passing the switching threshold, each comparator has built-in hysteresis of approximately 9.3 mV. Positive
feedback can be used to increase hysteresis.
V
IN
R1
R2
ADCMP361
IN
I
BIAS
DD
OUT
OUT
400mV
INPUTS
The comparator input is limited to the maximum VDD voltage
range. The voltage on these inputs can be above V
above the maximum allowed V
voltage. When adding a
DD
resistor string to the input, care must be taken when choosing
resistor values. This is due to the fact that the input bias current
will be in parallel with the bottom resistor, R2, of the input
resistor divider string. This bottom resistor must therefore be
chosen carefully in order to reduce the error introduced by this
bias current (see
Figure 30).
but never
DD
GND
Figure 30. Input Bias Current Effect on Input Resistor String
6496-028
Rev. 0 | Page 11 of 12
Page 12
ADCMP361
www.BDTIC.com/ADI
OUTLINE DIMENSIONS
2.90 BSC
1.60 BSC
1.30
1.15
0.90
0.15 MAX
5
123
PIN 1
COMPLIANT TO JEDEC STANDARDS MO-178-A A
1.90
BSC
0.50
0.30
4
0.95 BSC
2.80 BSC
1.45 MAX
SEATING
PLANE
0.22
0.08
10°
5°
0°
0.60
0.45
0.30
Figure 31. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dim
ensions shown in millimeters
ORDERING GUIDE
Model Temperature Range Package Description Package Option Branding
ADCMP361YRJZ-REEL7
1
Z = Pb-free part.
1
–40°C to +125°C 5-Lead SOT-23 RJ-5 M99
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06496-0-2/07(0)
Rev. 0 | Page 12 of 12
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