Single 0.275% Comparator and Reference
with Dual Polarity Outputs
ADCMP361
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
VDD
ADCMP361
IN
OUT
400mV
APPLICATIONS
06496-001
OUT
GND
Figure 1.
Li-Ion monitoring
Threshold detectors
Relay driving
Optoisolator driving
Industrial control systems
Handheld instruments
GENERAL DESCRIPTION
There are dual open-drain outputs to enable the comparator
and 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
automotive applications.
R1
4.7MΩ
VDD
IN
3V +
Li-Ion
CELL
R3
1MΩ
ADCMP361
+
OUT
–
R2
1MΩ
OUT
400mV
C1
100nF
GND
06496-029
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.
Figure 2. Typical Li-Ion Monitoring Application
DISCHARGING
VBATT
2.280V
CHARGING
2.271V
06496-030
VOUT
Figure 3. Li-Ion Monitoring Waveforms
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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.
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.
ADCMP361
TABLE OF CONTENTS
Features .............................................................................................. 1
Typical Performance Characteristics ..............................................6
Applications....................................................................................... 1
Application Information................................................................ 11
Functional Block Diagram .............................................................. 1
Comparators and Internal Reference ...................................... 11
General Description ......................................................................... 1
Power Supply............................................................................... 11
Revision History ............................................................................... 2
Inputs ........................................................................................... 11
Specifications..................................................................................... 3
Outputs ........................................................................................ 11
Absolute Maximum Ratings............................................................ 4
Adding Hysteresis....................................................................... 11
Thermal Characteristics .............................................................. 4
Outline Dimensions ....................................................................... 12
ESD Caution.................................................................................. 4
Ordering Guide .......................................................................... 12
Pin Configuration and Function Descriptions............................. 5
REVISION HISTORY
2/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADCMP361
SPECIFICATIONS
VDD = 1.7 V to 5.5 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 1.
Parameter
THRESHOLDS 1
Rising Input Threshold Voltage
Falling Input Threshold Voltage
Hysteresis = VTH(R) – VTH(F)
Threshold Voltage Accuracy
Threshold Voltage Temperature Coefficient
POWER SUPPLY
Supply Current
INPUT CHARACTERISTICS
Input Bias Current
OPEN-DRAIN OUTPUTS
Output Low Voltage 2
Output Leakage Current 3
DYNAMIC PERFORMANCE
High-to-Low Propagation Delay2, 4
Low-to-High Propagation Delay2, 4
Output Rise time2, 4
Output Fall time2, 4
Min
399.3
391.2
393.1
393.1
381.1
381.2
381.0
2
Typ
400.4
400.4
400.4
400.4
391.1
391.1
391.1
9.3
Max
401.5
407.7
405.9
405.8
400.9
398.4
398.2
13.5
±0.275
16
Unit
Test Conditions/Comments
mV
mV
mV
mV
mV
mV
mV
mV
%
ppm/°C
VDD = 3.3 V, TA = 25°C
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
TA = 25°C, VDD = 3.3 V
6.5
7.0
9
10
μA
μA
VDD = 1.7 V
VDD = 5.5 V
0.01
0.01
5
5
nA
nA
VDD = 1.7 V, VIN = VDD
VDD = 1.7 V, VIN = 0.1 V
140
140
0.01
0.01
220
220
1
1
mV
mV
μA
μA
VDD = 1.7 V, IOUT = 3 mA
VDD = 5.5 V, IOUT = 5 mA
VDD = 1.7 V, VOUT = VDD
VDD = 1.7 V, VOUT = 5.5 V
μs
μs
μs
μs
VDD = 5 V, VOL = 400 mV
VDD = 5 V, VOH = 0.9 × VDD
VDD = 5 V, VO = (0.1 to 0.9) × VDD
VDD = 5 V, VO = (0.1 to 0.9) × VDD
10
8
0.5
0.07
1
RL = 100 kΩ, VO = 2 V swing.
10 mV input overdrive.
3
VIN = 40 mV overdrive.
4
RL = 10 kΩ.
2
Rev. 0 | Page 3 of 12
ADCMP361
ABSOLUTE MAXIMUM RATINGS
THERMAL CHARACTERISTICS
Table 2.
Parameter
VDD
IN
OUT, OUT
Operating Temperature Range
Storage Temperature Range
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Rating
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
−40°C to +125°C
−65°C to +150°C
Table 3. Thermal Resistance
Package Type
5-Lead SOT-23
ESD CAUTION
300°C
215°C
220°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
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.
Rev. 0 | Page 4 of 12
θJA
240
Unit
°C/W
ADCMP361
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
GND
2
IN
3
5
OUT
4
VDD
ADCMP361
TOP VIEW
(Not to Scale)
06496-002
OUT
Figure 4. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
3
Mnemonic
OUT
GND
IN
4
5
VDD
OUT
Description
Noninverting Open-Drain Output.
Ground.
Monitors analog input voltage on comparator. The other input of the comparator is connected to a 400 mV
reference.
Power Supply.
Inverting Open-Drain Output.
Rev. 0 | Page 5 of 12
ADCMP361
TYPICAL PERFORMANCE CHARACTERISTICS
50
60
VDD = 5V
TA = 25°C
VDD = 5V
TA = 25°C
40
PERCENT OF UNITS (%)
40
30
20
FALLING INPUT THRESHOLD VOLTAGE (mV)
404
RISING INPUT THRESHOLD VOLTAGE (mV)
VDD = 5V
TA = 25°C
30
PERCENT OF UNITS (%)
Figure 8. Distribution of Falling Input Threshold Voltage
25
20
15
10
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)
TA = +25°C
HYSTERESIS (mV)
399
TA = +85°C
398
397
TA = +125°C
396
2.7
3.2
3.7
4.2
4.7
5.2
5.7
SUPPLY VOLTAGE (V)
06496-007
RISING INPUT THRESHOLD VOLTAGE (mV)
12.0
11.5
TA = –40°C
2.2
–20
0
20
40
60
80
100
120
Figure 9. Rising Input Threshold Voltage vs. Temperature
400
395
1.7
398
TEMPERATURE (°C)
Figure 6. Distribution of Hysteresis
401
FOUR TYPICAL PARTS
VDD = 5V
400
396
–40
06496-004
5
402
1
2
3
4
06496-005
Figure 5. Distribution of Rising Input Threshold Voltage
35
388 389 390 391 392 393 394 395 396 397 398 399 400
06496-006
0
06496-003
394 395 396 397 398 399 400 401 402 403 404 405 406
RISING INPUT THRESHOLD VOLTAGE (mV)
0
20
10
10
0
30
Figure 7. Rising Input Threshold Voltage vs. Supply Voltage
11.0
10.5
10.0
9.5
9.0
VDD
VDD
VDD
VDD
= 1.8V
= 2.5V
= 3.3V
= 5.0V
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
–40
–20
0
20
40
60
80
TEMPERATURE (°C)
Figure 10. Hysteresis vs. Temperature
Rev. 0 | Page 6 of 12
100
120
06496-010
PERCENT OF UNITS (%)
50
ADCMP361
12
1
TA = +125°C
11
0
THRESHOLD SHIFT (mV)
TA = +25°C
9
TA = +85°C
8
7
TA = –40°C
6
TA = –40°C
TA = +25°C
TA = +85°C
TA = +125°C
–1
–2
–3
2.2
2.7
3.2
3.7
4.2
4.7
5.2
5.7
SUPPLY VOLTAGE (V)
–5
1.5
06496-008
4
1.7
1.6
2.0
2.1
2.2
2.3
2.4
2.5
Figure 14. Minimum Supply Voltage
NO LOAD CURRENT
9
40
TA = +125°C
TA = +85°C
7
TA = +25°C
6
TA = –40°C
2.7
3.2
3.7
4.2
5.2
4.7
0
06496-009
2.2
20
TA = +25°C
10
5
4
1.7
30
SUPPLY VOLTAGE (V)
TA = +85°C
TA = +125°C
TA = –40°C
0
0.5
VDD
VDD
VDD
VDD
Figure 15. Start-Up Supply Current
1000
SUPPLY CURRENT (µA)
= 5.0V
= 3.3V
= 2.5V
= 1.7V
100
0.01
0.1
1
10
OUTPUT SINK CURRENT (mA)
100
06496-013
10
1
0.001
1.5
SUPPLY VOLTAGE (V)
Figure 12. Quiescent Supply Current vs. Supply Voltage
TA = –40°C
1.0
06496-012
8
SUPPLY CURRENT (µA)
SUPPLY CURRENT (mA)
1.9
50
10
SUPPLY CURRENT (µA)
1.8
SUPPLY VOLTAGE (V)
Figure 11. Hysteresis vs. Supply Voltage
1000
1.7
06496-011
–4
5
Figure 13. Supply Current vs. Output Sink Current
TA = 25°C
VDD
VDD
VDD
VDD
= 5.0V
= 3.3V
= 2.5V
= 1.7V
100
10
1
0.001
0.01
0.1
1
10
OUTPUT SINK CURRENT (mA)
Figure 16. Supply Current vs. Output Sink Current
Rev. 0 | Page 7 of 12
100
06496-014
HYSTERESIS (mV)
10
ADCMP361
10k
= 5.0V
= 3.3V
= 2.5V
= 1.7V
1k
100
10
100
TA = +85°C
TA = +25°C
10
1
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
TA = –40°C
0.1
–0.3
06496-015
1
0.001
–0.2
Figure 20. Below Ground Input Bias Current
3
10
–3
–5
CURRENT IS POSITIVE
GOING INTO THE DEVICE.
VDD = 5V
0V < VIB < 1V
0
0.4
0.2
0.6
0.8
1.0
INPUT VOLTAGE (V)
TA = +85°C
TA = +25°C
0.1
0.01
CURRENT IS GOING INTO THE DEVICE
VDD = 5V
VIB > 1V
1
2
1000
TA = 25°C
OUTPUT SATURATION VOLTAGE (mV)
= 5.0V
= 3.3V
= 2.5V
= 1.8V
100
0.1
1
10
OUTPUT SINK CURRENT (mA)
06496-019
10
0.01
5
4
Figure 21. High Level Input Bias Current
1000
1
0.001
3
INPUT VOLTAGE (V)
Figure 18. Low Level Input Bias Current
VDD
VDD
VDD
VDD
TA = –40°C
TA = –40°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
100
10
1
0.001
0.01
0.1
1
10
OUTPUT SINK CURRENT (mA)
Figure 22. Output Saturation Voltage vs. Output Sink Current
Figure 19. Output Saturation Voltage vs. Output Sink Current
Rev. 0 | Page 8 of 12
06496-020
–1
TA = +125°C
1
06496-018
INPUT BIAS CURRENT (nA)
TA = +125°C
TA = +85°C
TA = +25°C
TA = –40°C
06496-017
INPUT BIAS CURRENT (nA)
1
OUTPUT SATURATION VOLTAGE (mV)
0
–0.1
INPUT VOLTAGE (V)
Figure 17. Supply Current vs. Output Sink Current
–7
CURRENT IS GOING
OUT OF THE DEVICE.
VDD = 5V
–0.3V < VIB < 0V
TA = +125°C
06496-016
VDD
VDD
VDD
VDD
TA = 85°C
INPUT BIAS CURRENT (nA)
SUPPLY CURRENT (µA)
1000
ADCMP361
80
TA = 85°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
VDD = 5V
SHORT-CIRCUIT CURRENT (mA)
100
10
60
50
TA = +85°C
30
20
1
10
0
0
Figure 26. Short-Circuit Current vs. Output Voltage
10
TA = 25°C
OUTPUT LEAKAGE CURRENT (nA)
60
50
VDD = 3.3V
30
VDD = 2.5V
20
VDD = 1.8V
0
2
4
OUTPUT VOLTAGE (V)
TA = +125°C
1
TA = +85°C
TA = +25°C
0.1
TA = –40°C
0.01
0.001
06496-023
10
100
RISE AND FALL TIMES (µs)
50
2
3
40
30
20
5
VDD = 5V
CL = 20pF
TA = 25°C
10
RISE
1
0.1
10
FALL
0
20
40
60
80
INPUT OVERDRIVE (mV)
100
06496-025
0
4
Figure 27. Output Leakage Current vs. Output Voltage
LH NONINV
LH INV
HL NONINV
HL INV
TA = 25°C
1
OUTPUT VOLTAGE (V)
Figure 24. Short-Circuit Current vs. Output Voltage
60
0
Figure 25. Propagation Delay vs. Input Overdrive
0.01
0.1
1
10
100
1000
OUTPUT PULL-UP RESISTOR (kΩ)
Figure 28. Rise and Fall Times vs. Output Pull-Up Resistor
Rev. 0 | Page 9 of 12
06496-027
0
VDD = 5V
VDD = 5.0V
40
4
OUTPUT VOLTAGE (V)
Figure 23. Output Saturation Voltage vs. Output Sink Current
70
2
06496-022
0.1
06496-024
0.01
OUTPUT SINK CURRENT (mA)
SHORT-CIRCUIT CURRENT (mA)
TA = +125°C
40
10
1
0.001
PROPAGATION DELAY (µs)
TA = –40°C
TA = +25°C
70
06496-021
OUTPUT SATURATION VOLTAGE (mV)
1000
ADCMP361
NON INV (OUTA)
2
INV (OUTB)
3
VIN (+INA, –INB)
CH1 50.0mV
CH3 5.00V
CH2 5.00V
M20.0µs
CH1
7mV
06496-026
1
Figure 29. Noninverting and Inverting Comparators Propagation Delay
Rev. 0 | Page 10 of 12
ADCMP361
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.
OUTPUTS
The open-drain comparator outputs are limited to the
maximum specified VDD voltage range, regardless of the
VDD voltage. These outputs are capable of sinking up 40 mA.
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.
VDD
VIN
ADCMP361
R1
IN
POWER SUPPLY
R2
The ADCMP361 is designed to operate from 1.7 V to 5.5 V.
A 100 nF decoupling capacitor is recommended between VDD
and GND.
OUT
IBIAS
OUT
INPUTS
The comparator input is limited to the maximum VDD voltage
range. The voltage on these inputs can be above VDD but never
above the maximum allowed VDD voltage. When adding a
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).
Rev. 0 | Page 11 of 12
GND
06496-028
400mV
Figure 30. Input Bias Current Effect on Input Resistor String
ADCMP361
OUTLINE DIMENSIONS
2.90 BSC
5
4
2.80 BSC
1.60 BSC
1
2
3
PIN 1
0.95 BSC
1.90
BSC
1.30
1.15
0.90
1.45 MAX
0.15 MAX
0.50
0.30
0.22
0.08
SEATING
PLANE
10°
5°
0°
0.60
0.45
0.30
COMPLIANT TO JEDEC STANDARDS MO-178-A A
Figure 31. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADCMP361YRJZ-REEL7 1
1
Temperature Range
–40°C to +125°C
Package Description
5-Lead SOT-23
Z = Pb-free part.
©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
Package Option
RJ-5
Branding
M99