FEATURES
FUNCTIONAL BLOCK DIAGRAM
VDD
Window monitoring with minimum processor I/O
Individually monitoring N rails with only N + 1 processor I/O
400 mV, ± 0.275% threshold at VDD = 3.3 V, 25°C
Supply range: 1.7 V to 5.5 V
Low quiescent current: 17 μA maximum at 125°C
Input range includes ground
Internal hysteresis: 9.2 mV typical
Low input bias current: 2.5 nA maximum
Open-drain outputs
Power good indication output
Designated over voltage indication output
Low profile (1 mm), 6-lead TSOT package
ADCMP671
PWRGD
INH
UV
400mV
OV
OV
INL
10160-001
Data Sheet
Low Power, Adjustable UV and OV Monitor
with 400 mV, ±0.275% Reference
ADCMP671
GND
Figure 1.
APPLICATIONS
Supply voltage monitoring
Li-Ion monitoring
Portable applications
Handheld instruments
GENERAL DESCRIPTION
The ADCMP671 is available in 6-lead TSOT package. The
device operates over the −40°C to +125°C temperature range.
404
INH1
INL1
402
INH2
INL2
400
RISING INPUT
398
396
394
FALLING INPUT
392
390
388
TWO TYPICAL PARTS
COMPARATOR A AND COMPARATOR B
VDD = 5V
386
–40
–20
0
20
40
60
80
100
TEMPERATURE (°C)
120
10160-002
THRESHOLD VOLTAGE (mV)
The ADCMP671 voltage monitor consists of two low power, high
accuracy comparators and reference circuits. It operates on a
supply voltage from 1.7 V to 5.5 V and draws 17 μA maximum,
making it suitable for low power system monitoring and portable
applications. The part is designed to monitor and report supply
undervoltage and overvoltage fault. The low input bias current
and voltage reference allows resistor adjustable UV and OV
threshold down to 400 mV. The ADCMP671 has two opendrain outputs: the PWRGD output indicates that the supply is
within the UV and OV window, and the OV output indicates
that the supply is overvoltage. This output combination allows
users to window monitor N supplies with an N + 1 processor
input/output (I/O). Each output is guaranteed to sink greater
than 5 mA over temperature.
Figure 2. Comparator Thresholds vs. Temperature
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
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Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
ADCMP671
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Typical Performance Characteristics ..............................................9
Applications....................................................................................... 1
Applications Information .............................................................. 14
Functional Block Diagram .............................................................. 1
Comparators and Internal Reference ...................................... 14
General Description ......................................................................... 1
Power Supply............................................................................... 14
Revision History ............................................................................... 2
Inputs ........................................................................................... 14
Specifications..................................................................................... 3
Hysteresis..................................................................................... 14
Absolute Maximum Ratings............................................................ 7
Voltage Monitoring Scheme ..................................................... 14
Thermal Resistance ...................................................................... 7
Outputs ........................................................................................ 15
ESD Caution.................................................................................. 7
Outline Dimensions ....................................................................... 16
Pin Configuration and Function Descriptions............................. 8
Ordering Guide .......................................................................... 16
REVISION HISTORY
11/11—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
Data Sheet
ADCMP671
SPECIFICATIONS
VDD = 1.7 V to 5.5 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
THRESHOLDS 1
Rising Input Threshold Voltage (VTH(R))
Falling Input Threshold Voltage(VTH(F))
Rising Input Threshold Voltage Accuracy
Falling Input Threshold Voltage Accuracy
Hysteresis = VTH(R) − VTH(F)
INPUT CHARACTERISTICS
Input Bias Current
OPEN-DRAN OUTPUTS
Output Low Voltage 2
Output Leakage Current 3
DYNAMIC PERFORMANCE2, 4
High-to-Low Propagation Delay
Low-to-High Propagation Delay
Output Rise Time
Output Fall Time
POWER SUPPLY
Supply Current 5
Min
Typ
Max
Unit
Test Conditions/Comments
396.6
399.3
398.5
387
389.2
388.5
400.4
400.4
400.4
391
391
391
9.2
mV
mV
mV
mV
mV
mV
%
%
mV
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 3.3 V
VDD = 3.3 V
7.8
404.3
401.5
402.2
395.4
392.9
393.2
±0.275
±0.475
11.1
0.01
0.01
1
1
nA
nA
VDD = 1.7 V, VIN = VDD
VDD = 1.7 V, VIN = 0.1 V
140
130
0.01
0.01
200
200
0.1
0.1
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 = 5.5 V, VOL = 400 mV
VDD = 5.5 V, VOH = 0.9 × VDD
VDD = 5.5 V, VOUT = (0.1 to 0.9) × VDD
VDD = 5.5 V, VOUT = (0.1 to 0.9) × VDD
μA
μA
VDD = 1.7 V
VDD = 5.5 V
10
8
0.5
0.07
5.7
6.5
10
11
1
RL = 100 kΩ, VOUT = 2 V swing.
VIN = 10 mV input overdrive.
3
VIN = 40 mV overdrive.
4
RL = 10 kΩ.
5
No load current.
2
Rev. 0 | Page 3 of 16
ADCMP671
Data Sheet
VDD = 1.7 V to 5.5 V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
Table 2.
Parameter
THRESHOLDS 1
Rising Input Threshold Voltage (VTH(R))
Falling Input Threshold Voltage (VTH(F))
Rising Input Threshold Voltage Accuracy
Falling Input Threshold Voltage Accuracy
Hysteresis = VTH(R) − VTH(F)
INPUT CHARACTERISTICS
Input Bias Current
OPEN-DRAIN OUTPUTS
Output Low Voltage 2
Output Leakage Current 3
POWER SUPPLY
Supply Current 4
Min
395.3
397.3
396.8
385.8
386.2
385.8
6.8
Typ
Max
Unit
Test Conditions/Comments
405.3
403.3
403.8
397.3
394.8
395.2
±0.75
±1.1
12.2
mV
mV
mV
mV
mV
mV
%
%
mV
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 3.3 V
VDD = 3.3 V
1
1
nA
nA
VDD = 1.7 V, VIN = VDD
VDD = 1.7 V, VIN = 0.1 V
250
250
0.1
0.1
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
13
14
μA
μA
VDD = 1.7 V
VDD = 5.5 V
1
RL = 100 kΩ, VOUT = 2 V swing.
VIN =10 mV input overdrive.
VIN = 40 mV overdrive.
4
No load.
2
3
Rev. 0 | Page 4 of 16
Data Sheet
ADCMP671
VDD = 1.7 V to 5.5 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 3.
Parameter
THRESHOLDS 1
Rising Input Threshold Voltage (VTH(R))
Falling Input Threshold Voltage (VTH(F))
Rising Input Threshold Voltage Accuracy
Falling Input Threshold Voltage Accuracy
Hysteresis = VTH(R) − VTH(F)
INPUT CHARACTERISTICS
Input Bias Current
OPEN-DRAIN OUTPUTS
Output Low Voltage 2
Output Leakage Current 3
POWER SUPPLY
Supply Current 4
Min
391.2
393.1
393.5
383.3
384.7
384.4
5.4
Typ
Max
Unit
Test Conditions/Comments
407.8
405.9
405.4
400.9
398.4
398.2
±1.6
±1.75
12.6
mV
mV
mV
mV
mV
mV
%
%
mV
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 3.3 V
VDD = 3.3 V
1
1
nA
nA
VDD = 1.7 V, VIN = VDD
VDD = 1.7 V, VIN = 0.1 V
250
250
0.1
0.1
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
14
15
μA
μA
VDD = 1.7 V
VDD = 5.5 V
1
RL = 100 kΩ, VOUT = 2 V swing.
VIN = 10 mV input overdrive.
VIN = 40 mV overdrive.
4
No load.
2
3
Rev. 0 | Page 5 of 16
ADCMP671
Data Sheet
VDD = 1.7 V to 5.5 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 4.
Parameter
THRESHOLDS 1
Rising Input Threshold Voltage (VTH(R))
Falling Input Threshold Voltage (VTH(F))
Rising Input Threshold Voltage Accuracy
Falling Input Threshold Voltage Accuracy
Hysteresis = VTH(R) − VTH(F)
INPUT CHARACTERISTICS
Input Bias Current
Min
Typ
391.2
393.1
393.1
381.1
381.2
381
5.4
OPEN-DRAIN OUTPUTS
Output Low Voltage 2
Output Leakage Current 3
POWER SUPPLY
Supply Current 4
1
RL = 100 kΩ, VOUT = 2 V swing.
VIN = 10 mV input overdrive.
VIN = 40 mV overdrive.
4
No load.
2
3
Rev. 0 | Page 6 of 16
Max
Unit
Test Conditions/Comments
407.8
405.9
405.8
400.9
398.4
398.2
±1.6
±2.2
13.5
mV
mV
mV
mV
mV
mV
%
%
mV
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 1.7 V
VDD = 3.3 V
VDD = 5.5 V
VDD = 3.3 V
VDD = 3.3 V
2.5
2.5
nA
nA
VDD = 1.7 V, VIN = VDD
VDD = 1.7 V, VIN = 0.1 V
250
250
0.1
0.1
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
16
17
μA
μA
VDD = 1.7 V
VDD = 5.5 V
Data Sheet
ADCMP671
ABSOLUTE MAXIMUM RATINGS
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.
Table 5.
Parameter
VDD
INH, INL
OV, PWRGD
Output Short-Circuit Duration1
Input Current
Operating Temperature Range
Storage Temperature Range
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
1
Rating
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
Indefinite
−10 mA
−40°C to +125°C
−65°C to +150°C
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
300°C
215°C
220°C
Table 6. Thermal Resistance
When the output is shorted indefinitely, the use of a heat sink may be required to
keep the junction temperature within the absolute maximum ratings.
Package Type
6-Lead TSOT
ESD CAUTION
Rev. 0 | Page 7 of 16
θJA
200
Unit
°C/W
ADCMP671
Data Sheet
PWRGD
1
GND
2
INH
3
ADCMP671
TOP VIEW
(Not to Scale)
6
OV
5
VDD
4
INL
10160-003
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 3. Pin Configuration
Table 7. Pin Function Descriptions
Pin No.
1
Mnemonic
PWRGD
2
3
GND
INH
4
INL
5
6
VDD
OV
Description
Open-Drain Active High Power Good Output. It asserts when the input falls within the UV and OV window, for
example, INH high and INL low.
Ground.
Monitors for Supply Undervoltage Fault Through an External Resistor Divider Network. It is internally connected to the
noninverting input of a comparator. The other input of the comparator is connected to a 400 mV reference.
Monitors for Supply Overvoltage Fault Through an External Resistor Divider Network. It is internally connected to the
inverting input of a comparator. The other input of the comparator is connected to a 400 mV reference.
Power Supply Pin.
Open-Drain Output Active Low Overvoltage Fault Indication Output. It asserts when there is an overvoltage fault,
for example, INL high.
Rev. 0 | Page 8 of 16
Data Sheet
ADCMP671
TYPICAL PERFORMANCE CHARACTERISTICS
50
VDD = 5V
TA = 25°C
VDD = 5V
TA = 25°C
40
PERCENT OF UNITS (%)
40
30
20
FALLING INPUT THRESHOLD VOLTAGE (mV)
Figure 4. Distribution of Rising Input Threshold Voltage
Figure 7. Distribution of Falling Input Threshold Voltage
402
VDD = 5V
TA = 25°C
RISING INPUT THRESHOLD VOLTAGE (mV)
PERCENT OF UNITS (%)
30
25
20
15
10
5
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)
401
401
RISING INPUT THRESHOLD VOLTAGE (mV)
FOUR TYPICAL PARTS
VDD = 5V
398
–20
0
20
40
60
80
0
20
40
60
80
100
120
Figure 8. Rising Input Threshold Voltage vs.
Temperature for Various VDD Voltages
400
396
–40
–20
TEMPERATURE (°C)
100
TEMPERATURE (°C)
120
TA = –40°C
400
TA = +25°C
399
TA = +85°C
398
397
TA = +125°C
396
395
1.7
10160-006
RISING INPUT THRESHOLD VOLTAGE (mV)
402
1
2
3
4
= 1.8V
= 2.5V
= 3.3V
= 5.0V
399
Figure 5. Distribution of Hysteresis
404
VDD
VDD
VDD
VDD
400
398
–40
10160-005
0
388 389 390 391 392 393 394 395 396 397 398 399 400
10160-007
0
10160-004
394 395 396 397 398 399 400 401 402 403 404 405 406
RISING INPUT THRESHOLD VOLTAGE (mV)
35
20
10
10
0
30
10160-008
PERCENT OF UNITS (%)
50
2.2
2.7
3.2
3.7
4.2
4.7
5.2
5.7
SUPPLY VOLTAGE (V)
Figure 6. Rising Input Threshold Voltage vs.
Temperature for Four Typical Parts
Figure 9. Rising Input Threshold Voltage vs. Supply Voltage
Rev. 0 | Page 9 of 16
10160-009
60
ADCMP671
11.0
10.5
10.0
9.5
9.0
FOUR TYPICAL PARTS
VDD = 5V
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
10.0
9.5
9.0
= 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
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
4.0
–40
10160-010
4.5
4.0
–40
VDD
VDD
VDD
VDD
11.0
10.5
HYSTERESIS (mV)
HYSTERESIS (mV)
12.0
11.5
1NH1
1NL1
INH2
INL2
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 10. Hysteresis vs. Temperature for Four Typical Parts
10160-013
12.0
11.5
Data Sheet
Figure 13. Hysteresis vs. Temperature for Various VDD Voltages
1
12
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
10160-011
4
1.7
1.9
2.0
2.1
2.2
2.3
2.4
2.5
50
NO LOAD CURRENT
8
SUPPLY CURRENT (µA)
40
TA = +125°C
TA = +85°C
7
TA = +25°C
6
TA = –40°C
5
2.2
2.7
30
20
TA = +25°C
10
3.2
3.7
4.2
4.7
5.2
SUPPLY VOLTAGE (V)
10160-012
SUPPLY CURRENT (µA)
1.8
Figure 14. Minimum Supply Voltage
9
4
1.7
1.7
SUPPLY VOLTAGE (V)
Figure 11. Hysteresis vs. Supply Voltage
10
1.6
10160-014
–4
5
Figure 12. Quiescent Supply Current vs. Supply Voltage
0
TA = +85°C
TA = +125°C
TA = –40°C
0
0.5
1.0
SUPPLY VOLTAGE (V)
Figure 15. Start-Up Supply Current
Rev. 0 | Page 10 of 16
1.5
10160-015
HYSTERESIS (mV)
10
Data Sheet
10
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
TA = 25°C
VDD
VDD
VDD
VDD
100
10
1
0.001
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
Figure 16. Supply Current vs. Output Sink Current for TA = −40°C
Figure 19. Supply Current vs. Output Sink Current for TA = 25°C
1000
10k
= 5.0V
= 3.3V
= 2.5V
= 1.7V
1k
100
10
0.01
0.1
1
10
100
100
TA = +85°C
TA = +25°C
10
OUTPUT SINK CURRENT (mA)
TA = –40°C
0.1
–0.3
10160-018
1
0.001
–0.2
0
–0.1
INPUT VOLTAGE (V)
Figure 17. Supply Current vs. Output Sink Current for TA = 85°C
Figure 20. Below Ground Input Bias Current vs. Input Voltage
10
INPUT BIAS CURRENT (nA)
1
TA = +125°C
TA = +85°C
TA = +25°C
TA = –40°C
–1
–3
–5
0
0.2
0.4
0.6
0.8
INPUT VOLTAGE (V)
1.0
10160-020
CURRENT IS POSITIVE
GOING INTO THE DEVICE
VDD = 5V
0V < VIB < 1V
Figure 18. Low Level Input Bias Current vs. Input Voltage
TA = +125°C
1
TA = +85°C
TA = +25°C
0.1
0.01
TA = –40°C
CURRENT IS GOING INTO THE DEVICE
VDD = 5V
VIB > 1V
1
2
3
4
INPUT VOLTAGE (V)
Figure 21. High Level Input Bias Current vs. Input Voltage
Rev. 0 | Page 11 of 16
5
10160-021
3
–7
CURRENT IS GOING
OUT OF THE DEVICE.
VDD = 5V
–0.3V < VIB < 0V
TA = +125°C
INPUT BIAS CURRENT (nA)
VDD
VDD
VDD
VDD
TA = 85°C
1
INPUT BIAS CURRENT (nA)
= 5.0V
= 3.3V
= 2.5V
= 1.7V
10160-017
SUPPLY CURRENT (µA)
100
1
0.001
SUPPLY CURRENT (µA)
1000
= 5.0V
= 3.3V
= 2.5V
= 1.7V
10160-019
VDD
VDD
VDD
VDD
TA = –40°C
10160-016
SUPPLY CURRENT (µA)
1000
ADCMP671
ADCMP671
1000
100
10
1
0.001
0.01
0.1
1
10
OUTPUT SINK CURRENT (mA)
Figure 22. Output Saturation Voltage vs. Output Sink Current for TA = 25°C
10
0.01
0.1
1
10
OUTPUT SINK CURRENT (mA)
Figure 25. Output Saturation Voltage vs. Output Sink Current for TA = −40°C
80
TA = 85°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
VDD = 5V
SHORT-CIRCUIT CURRENT (mA)
10
TA = –40°C
TA = +25°C
70
100
60
50
TA = +85°C
TA = +125°C
40
30
20
0.1
1
10
OUTPUT SINK CURRENT (mA)
0
OUTPUT LEAKAGE CURRENT (nA)
50
VDD = 3.3V
40
30
VDD = 2.5V
20
VDD = 1.8V
0
2
4
OUTPUT VOLTAGE (V)
10160-026
10
0
VDD = 5V
VDD = 5.0V
60
4
Figure 26. Output Short-Circuit Current vs. Output Voltage
10
TA = 25°C
2
OUTPUT VOLTAGE (V)
Figure 23. Output Saturation Voltage vs. Output Sink Current for TA = 85°C
70
0
Figure 24. Output Short-Circuit Current vs. Output Voltage
TA = +125°C
1
TA = +85°C
TA = +25°C
0.1
TA = –40°C
0.01
0.001
0
1
2
3
4
OUTPUT VOLTAGE (V)
Figure 27. Output Leakage Current vs. Output Voltage
Rev. 0 | Page 12 of 16
5
10160-027
0.01
10160-025
10
1
0.001
SHORT-CIRCUIT CURRENT (mA)
100
1
0.001
10160-024
OUTPUT SATURATION VOLTAGE (mV)
1000
TA = –40°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
10160-023
OUTPUT SATURATION VOLTAGE (mV)
TA = 25°C
VDD = 5.0V
VDD = 3.3V
VDD = 2.5V
VDD = 1.8V
10160-022
OUTPUT SATURATION VOLTAGE (mV)
1000
Data Sheet
Data Sheet
70
ADCMP671
5
TA = 25°C
INH LH
INL LH
INH HL
INL HL
OUTPUTS BEING PULLED UP TO VDD WITH 10kΩ
INH = LOW
INL = LOW
4
50
40
VOUT (V)
PROPAGATION DELAY (µs)
60
30
3
2
20
1
PWRGD
10
0
20
40
60
80
100
INPUT OVERDRIVE (mV)
0
10160-028
0
0
1
2
3
4
5
VDD (V)
Figure 28. Propagation Delay vs. Input Overdrive
10160-031
OV
Figure 31. Output Voltage vs. Supply Voltage with Both INH and INL Low
5
INL VTH(R)
INH VTH(R)
INL VTH(F)
OUTPUTS BEING PULLED UP TO VDD WITH 10kΩ
INH = HIGH
INL = LOW
4
VOUT (V)
VIN
INH VTH(F)
1
PWRGD
3
3
2
OV
1
CH4 5.0V
OV
0
M40.0µs
0
1
2
3
4
5
VDD (V)
Figure 29. Propagation Delay
Figure 32. Output Voltage vs. Supply Voltage with INH High and INL Low
5
VDD = 5V
CL = 20pF
TA = 25°C
OUTPUTS BEING PULLED UP TO VDD WITH 10kΩ
INH = HIGH
INL = HIGH
4
10
VOUT (V)
RISE
1
3
2
0.1
1
FALL
1
10
100
1000
OUTPUT PULL-UP RESISTOR (kΩ)
Figure 30. Rise and Fall Times vs. Output Pull-Up Resistor
0
0
1
2
3
VDD (V)
4
5
10160-033
0.01
0.1
PWRGD
OV
10160-030
RISE AND FALL TIMES (µs)
100
10160-032
CH3 5.0V
PWRGD
10160-029
R_PULLUP = 10kΩ
V_PULLUP = 5V
4
Figure 33. Output Voltage vs. Supply Voltage with Both INH and INL High
Rev. 0 | Page 13 of 16
ADCMP671
Data Sheet
APPLICATIONS INFORMATION
The ADCMP671 is a UV and OV monitor with a built-in 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 9.2 mV. The outputs
are open-drain, capable of sinking 40 mA.
12V
5V
VDD
ADCMP671
RX
PWRGD
INH
UV
There are two comparators inside the ADCMP671. The
comparator with its noninverting input connected to the INH
pin (and its inverting input connected internally to the 400 mV
reference) is for undervoltage detection, and the comparator
with its inverting input available through the INL pin (and its
noninverting input connected internally to the 400 mV reference)
is for overvoltage detection. The rising input threshold voltage of
the comparators is designed to be equal to that of the reference.
POWER SUPPLY
The ADCMP671 is designed to operate from 1.7 V to 5.5 V.
A 0.1 μF decoupling capacitor is recommended between VDD
and GND.
INL
To minimize the number of external components use three
resistor dividers to program the UV and OV thresholds.
HYSTERESIS
To prevent oscillations at the output caused by noise or slowly
moving signals passing the switching threshold, each comparator
has a built-in hysteresis of approximately 8.9 mV.
VOLTAGE MONITORING SCHEME
When monitoring a supply rail, the desired nominal operating
voltage for monitoring is denoted by VM, IM is the nominal current
through the resistor divider, VOV is the overvoltage trip point,
and VUV is the undervoltage trip point.
Figure 34 illustrates the voltage monitoring input connection.
Three external resistors, RX, RY, and RZ, divide the positive voltage
for monitoring (VM) into the high-side voltage (VH) and lowside voltage (VL). The high-side voltage is connected to the INH
pin, and the low-side voltage is connected to the INL pin.
OV
RZ
GND
Figure 34. Undervoltage/Overvoltage Monitoring Configuration
To trigger an overvoltage condition, the low-side voltage (in this
case, VL) must exceed the 0.4 V threshold on the INL pin. The
low-side voltage, VL, is given by the following equation:
⎛
RZ
VL = VOV ⎜⎜
⎝ RX + RY + RZ
INPUTS
The comparator inputs are limited to the maximum VDD voltage
range. The voltage on these inputs can be more than VDD but never
more than the maximum allowed VDD voltage. When adding a
resistor string to the input, choose resistor values carefully because
the input bias current is in parallel with the bottom resistor of
the string. Therefore, choose the bottom resistor first to control
the error introduced by the bias current.
OV
400mV
RY
10160-034
COMPARATORS AND INTERNAL REFERENCE
⎞
⎟ = 0.4 V
⎟
⎠
Also,
R X + RY + RZ =
VM
IM
Therefore, RZ, which sets the desired trip point for the overvoltage
monitor, is calculated using the following equation:
RZ =
(0.4)(VM )
(VOV )(I M )
To trigger the undervoltage condition, the high-side voltage, VH,
must fall below the 0.4 V threshold on the INH pin. The highside voltage, VH, is given by the following equation:
⎛ RY + RZ
VH = VUV ⎜⎜
⎝ R X + RY + RZ
⎞
⎟ = 0.4 V
⎟
⎠
Because RZ is already known, RY can be expressed as follows:
RY =
(0.4)(VM )
−R
(VUV )(I M ) Z
When RY and RZ are known, RX is calculated using the following
equation:
RX =
(VM ) − R − R
(I M ) Z Y
If VM, IM, VOV, or VUV changes each step must be recalculated.
Rev. 0 | Page 14 of 16
Data Sheet
ADCMP671
PWRGD
2.5V
The PWRGD output is used to indicate supply power good for
the rail being monitored. It asserts if the monitored voltage falls
within the UV and OV threshold window. The OV output acts
as a dedicated overvoltage indication output, allows the board
manager to take decisive action to protect the system from
overvoltage faults. Both outputs are open-drain and can be
pulled up to voltages above VDD. These outputs are capable of
sinking current up to 40 mA.
In the multisupply monitoring application, multiple ADCMP671
can be used with their OV pin tied together to generate a single
overvoltage fault alert signal, as shown in Figure 35. During power
up and power down, the power management processor of the
board can manage supply sequencing based on PWRGD signals.
In the event of supply overvoltage fault, the processor can react
quickly to the provide necessary circuit protection because of its
dedicated OV alert. The processor is also able to identify the faulty
supply from combining the information on the PWRGD pins.
This allows the processor to use the N + 1 input pins to
individually monitor N channels of supplies.
Rev. 0 | Page 15 of 16
1.8V
ADCMP671
OV
PWRGD
ADCMP671
OV
PWRGD
1.0V
2.5V GOOD
1.8V GOOD
1.0V GOOD
0.9V GOOD
ADCMP671
OV FAULT
BOARD
MANAGER
OV
PWRGD
0.9V
ADCMP671
OV
Figure 35. N Rails Monitoring with N + 1 Processor I/O
10160-035
OUTPUTS
ADCMP671
Data Sheet
OUTLINE DIMENSIONS
2.90 BSC
6
5
4
2.80 BSC
1.60 BSC
1
3
2
PIN 1
INDICATOR
0.95 BSC
1.90
BSC
*1.00 MAX
0.10 MAX
SEATING
PLANE
0.50
0.30
0.20
0.08
8°
4°
0°
0.60
0.45
0.30
*COMPLIANT TO JEDEC STANDARDS MO-193-AA WITH
THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS.
102808-A
*0.90
0.87
0.84
Figure 36. 6-Lead Thin Small Outline Transistor Package [TSOT]
(UJ-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model 1
ADCMP671-1YUJZ-RL7
1
Temperature Range
−40°C to +125°C
Package Description
6-Lead Thin Small Outline Transistor Package [TSOT]
Z = RoHS Compliant Part.
©2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D10160-0-11/11(0)
Rev. 0 | Page 16 of 16
Package Option
UJ-6
Branding
LLS
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