MAX22517_V01 [MAXIM]
Self-Powered, 2-Channel, 3.5kVRMS Digital Isolator;
| 型号： | MAX22517_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Self-Powered, 2-Channel, 3.5kVRMS Digital Isolator |
| 文件： | 总25页 (文件大小：2583K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
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MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
General Description
Benefits and Features
The MAX22517–MAX22519 are dual-channel digital gal-
vanic isolators with integrated field-side supply using Max-
im's proprietary process technology. The field-side power
is supplied by the logic-side using an integrated isolated
DC-DC converter. This approach eliminates the bulky and
expensive external isolated power supply when the power
demand of the field side is small. All of the devices in the
family feature basic isolation with a withstand voltage rat-
● Robust Protection in Small Footprint
• Integrated Isolated Field-Side Supply
• Integrated Galvanic Digital Isolation
• Integrated Surge and Short Protection with External
Series Resistor
• 24VAC Short Protection
• ±1kV Line-to-Ground and ±2kV Line-to-Line
Surge Tolerance (1.2/50μs Waveform)
• Compact 8-Pin Wide-Body SOIC Package (5.5mm
Creepage)
ing of 3.5kV
for 60s or 445V
of continuous oper-
RMS
RMS
ation. With a single resistor on each input, the inputs of
the MAX22517–MAX22519 can withstand 1.2/50μs surge
pulses up to ±2kV between inputs (common mode) or
up to ±1kV between input and field ground (differential),
as well as continuous shorts to 24VAC. The
MAX22517–MAX22519 provide compact, reliable, and
cost-efficient solutions for applications such as industrial
IoT, industrial networking systems, and building automa-
tion.
● Robust Galvanic Isolation of Digital Signals
• 3.5kV
• 445V
Isolation Voltage for 60s (V
Continuous Working Voltage (V
)
RMS
RMS
ISO
)
IOWM
● Design Flexibility
• 220μA Field-Side Supply External Load Capability
• 3V to 5.5V Logic-Side Supply
• -40°C to +125°C Operating Temperature Range
Both sides of the isolators are powered from a single 3.0V
to 5.5V supply on the logic side, which also sets the output
logic level. Both channels of the MAX22517–MAX22519
transfer data from the field side to the logic side and are
always enabled. Each output is high when the correspond-
ing input is high and low when the corresponding input is
low.
Safety Regulatory Approvals
● UL According to UL1577
● cUL According to CSA Bulletin 5A
Devices are available with either push-pull or open-drain
outputs, and output default states are either logic-high
(push-pull version) or high impedance (open-drain ver-
sions). The default is the state the output assumes when
either power domain of the device is undervoltage or the
input is open circuit. See the Ordering Information for the
part numbers associated with each option.
All of the devices in the MAX22517–MAX22519 family are
available in a 8-pin wide-body SOIC package with 5.5mm
of creepage and clearance. The package material has a
minimum comparative tracking index (CTI) of 400, which
gives it a group II rating in creepage tables. All devices
are rated for operation at ambient temperatures of -40°C
to +125°C.
Applications
● Industrial IoT
● Industrial Networking Systems
● Building Automation
● Medical Equipment
19-100722; Rev 1; 9/21
Ordering Information appears at end of data sheet.
© 2022 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2022 Analog Devices, Inc. All rights reserved.
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Dual Relay Contact Monitoring System
3.3V
MAX22517
V
V
DDL
DDF
µPOWER DC-DC
0.1µF
0.1µF 1000pF
CHARGE
PUMP
27kΩ
27kΩ
CONTROLLER
GPI1
RELAY CONTACT
10kΩ
10kΩ
IN1F
IN2F
OUT1L
C
RELAY_DIS
OUT2L
GNDL
GPI2
C
RELAY_DIS
GNDF
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Analog Devices | 2
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Absolute Maximum Ratings
DDF
V
to GNDF (internally generated) ...................... -0.3V to +6V
MAX22518, MAX22519.........................................-0.3V to +6V
Short-Circuit Continuous Current
IN_F Current
MAX22517, MAX22518 .................................. -6mA to +5.5mA
MAX22519 ......................................................... -6mA to +6mA
IN_F to GNDF (no series resistor)
OUT_L to V
Continuous Power Dissipation (T = +70°C)
or GNDL...............................................±50mA
DDL
A
Wide SOIC (derate 9.39mW/°C above +70°C) ........751.17mW
Operating Temperature Range...........................-40°C to +125°C
Maximum Junction Temperature ......................................+150°C
Storage Temperature Range ..............................-60°C to +150°C
Lead Temperature (soldering, 10s)...................................+300°C
Soldering Temperature (reflow) ........................................+260°C
MAX22517, MAX22518 ................................... -0.4V to +5.65V
MAX22519 ............................................ -0.4V to (V
+ 0.3V)
DDF
IN_F to GNDF (10kΩ series resistor) ...................... -60V to +60V
to GNDL.......................................................... -0.3V to +6V
V
DDL
OUT_L to GNDL
MAX22517 ............................................ -0.3V to (V
+ 0.3V)
DDL
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Package Information
8 Wide SOIC
Package Code
W8MS+1
21-0262
90-0258
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
106.5°C/W
46.67°C/W
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates
RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal
considerations, refer to www.maximintegrated.com/thermal-tutorial.
DC Electrical Characteristics
(V
- V
= 3.0V to 5.5V, C = 15pF, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
- V
= 3.3V,
DDL
GNDL
L
A
DDL
GNDL
V
GNDF
= V
, T = +25°C, unless otherwise noted.) (Note 1)
GNDL A
PARAMETER
FIELD SIDE
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
Supply Voltage
V
Relative to GNDF, internally regulated
Data rate < 100kbps
2.7
4
V
DDF
DDF
V
DDF
External Load
I
220
µA
DDF_LD
Current
Field-Side
Undervoltage-Lockout
Threshold
V
V
DDF
rising
1.95
2.1
2.25
V
UVLOF
Field-Side
Undervoltage-Lockout
Threshold Hysteresis
V
100
mV
UVLOF_HYST
FIELD-SIDE INPUTS (IN_F)
MAX22517/MAX22518, I
per input
= -1μA
IN_BST
Input Boost Voltage
V
5
5.5
V
IN_BST
Input Boost Current
Input Pullup Current
I
MAX22517/MAX22518
MAX22519
-5
-5
µA
µA
IN_BST
I
-10
-1.5
IN_PU
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Analog Devices | 3
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
DC Electrical Characteristics (continued)
(V
- V
= 3.0V to 5.5V, C = 15pF, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
- V
= 3.3V,
DDL
GNDL
L
A
DDL
GNDL
V
GNDF
= V
, T = +25°C, unless otherwise noted.) (Note 1)
GNDL A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0.7 x
Field Input High Voltage
Field Input Low Voltage
V
V
IH
V
DDF
0.3 x
V
V
V
IL
V
DDF
Field Input Hysteresis
V
HYS
0.4
LOGIC SIDE
V
Supply Voltage
V
Relative to GNDL
3
5.5
10
10
V
DDL
DDL
V
DDL
DDL
= 5V, C = 0pF
7.5
7.5
L
V
DDL
Supply Current
I
mA
DDL
V
= 3.3V, C = 0pF
L
Logic-Side
Undervoltage-Lockout
Threshold
V
V
DDL
rising
2.69
2.82
100
2.95
V
UVLOL
Logic-Side
Undervoltage-Lockout
Threshold Hysteresis
V
mV
UVLOL_HYST
LOGIC-SIDE OUTPUTS (OUT_L)
Output Logic-High
Voltage
V
-
DDL
0.4
V
MAX22517, OUT_L sourcing 4mA
OUT_L sinking 4mA
V
V
OH
Output Logic-Low
Voltage
V
0.4
+1
OL
Output Logic-High
Leakage Current
MAX22518/MAX22519, OUT_L = 0V,
5.5V
I
-1
μA
OH_LK
Dynamic Characteristics
(V
- V
= 3.0V to 5.5V, C = 15pF, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
- V = 3.3V,
GNDL
DDL
GNDL
L
A
DDL
V
GNDF
= V
, T = +25°C, unless otherwise noted.) (Note 2)
GNDL A
PARAMETER
Common-Mode
SYMBOL
CONDITIONS
IN_F = GNDF or V (Note 4)
MIN
TYP
MAX
UNITS
CMTI
50
kV/μs
Mbps
μs
DDF
Transient Immunity
Maximum Data Rate
DR
(Note 1)
No external capacitor on IN_F (Note 1)
1
MAX
Minimum Detectable
Field Input Pulse Width
PW
1
MIN
Glitch Rejection
55
ns
Power-Up Delay (Figure
2)
t
t
C
= 0.1μF
280
μs
DEL
VDDF
No external input series resistance
10kΩ external input series resistance
No external input series resistance
10kΩ external input series resistance
No external input
80
120
80
130
130
PLH
Propagation Delay
(Figure 1)
ns
ns
t
PHL
120
20
series resistance
|t
- t
|,
PLH PHL
Pulse Width Distortion
www.analog.com
PWD
MAX22517
10kΩ external input
series resistance
10
Analog Devices | 4
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Dynamic Characteristics (continued)
(V
- V
= 3.0V to 5.5V, C = 15pF, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
- V
= 3.3V,
DDL
GNDL
L
A
DDL
GNDL
V
GNDF
= V
, T = +25°C, unless otherwise noted.) (Note 2)
GNDL A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Propagation Delay Skew
Part-to-Part (Same
Channel)
t
t
No external input series resistance
70
70
10
10
SPLH
SPHL
ns
ns
No external input series resistance
No external input series resistance
No external input series resistance
Propagation Delay Skew
Channel-to-Channel
(Same Part) (Figure 1)
t
t
SCSLH
SCSHL
JIT(PK)
Peak Eye Diagram Jitter
Rise Time (Figure 1)
Fall Time (Figure 1)
t
1Mbps
10
20
20
ns
ns
ns
t
R
MAX22517
35
35
t
F
Note 1: All devices are 100% production tested at T = +25°C. Specifications over temperature are guaranteed by design and
A
characterization.
Note 2: Not production tested. Guaranteed by design and characterization.
Note 3: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to their
respective ground (GNDF or GNDL), unless otherwise noted.
Note 4: CMTI is the maximum sustainable common-mode voltage slew rate while maintaining the correct output. CMTI applies to both
rising and falling common-mode voltage edges. Tested with the transient generator connected between GNDF and GNDL
(V
= 1000V).
CM
V
DDF
50%
50%
IN1F, IN2F
0.1µF
1000pF
0.1µF
GNDF
t
t
PHL
PLH
V
DDL
V
V
DDL
DDF
V
DDL
MAX22517 –
MAX22519
50%
50%
OUT1L
OUT2L
0Ω OR 10kΩ
GNDL
IN_F
OUT_L
t
t
SCSHL
SCSLH
TEST
C
L
SOURCE
GNDF
GNDL
V
DDL
90%
50%
10%
50%
GNDL
t
t
F
R
(A)
(B)
Figure 1. Test Circuit (A) and Timing Diagram (B)
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Analog Devices | 5
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
V
DDL
0.1µF
1000pF
0.1µF
V
V
DDL
DDF
MAX22517
V
OUT_L
IN_F
OUT_L
V
DDL
50%
V
DDL
GNDF
GNDL
GNDL
V
DDL
V
DDL
50%
DEL
OUT_L
0.1µF
1000pF
0.1µF
GNDL
V
V
DDL
DDF
t
MAX22518/
MAX22519
4.7kΩ
V
OUT_L
IN_F
OUT_L
GNDF
GNDL
Figure 2. Power-Up Delay Timing Diagram
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Analog Devices | 6
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Insulation Characteristics
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Repetitive
Peak Isolation Voltage
V
IORM
(Note 5)
630
V
P
Maximum Working
Isolation Voltage
V
Continuous RMS voltage (Note 5)
t = 1s (Note 5)
445
V
V
IOWM
RMS
Maximum Transient
Isolation Voltage
V
5000
V
P
IOTM
Maximum Withstand
Isolation Voltage (Table
1)
V
f
= 60Hz, duration = 60s (Note 5, 6)
3500
10
ISO
SW
RMS
kV
Maximum Surge
Isolation Voltage
Basic insulation, 1.2/50μs pulse per IEC
61000-4-5 (Note 8)
V
IOSM
12
V
V
V
= 500V, T = 25°C
> 10
> 10
IO
IO
IO
A
11
9
Insulation Resistance
R
C
= 500V, 100°C ≤ T ≤ 125°C
Ω
IO
A
= 500V at T = 150°C
S
> 10
2
Barrier Capacitance
Field-Side to Logic-Side
f
= 1MHz (Note 7)
pF
IO
SW
Minimum Creepage
Distance
CPG
CLR
5.5
mm
Minimum Clearance
Distance
5.5
mm
mm
Internal Clearance
Distance through insulation
Material Group II (IEC 60112)
0.015
> 400
Comparative Tracking
Index
CTI
40/125/
21
Climate Category
Pollution Degree
DIN VDE 0110, Table 1
2
Note 5: V
, V
, V
, V
, and V
are defined by the IEC 60747-5-5 standard.
IORM
ISO IOTM IOSM IOWM
Note 6: Product is qualified at V
for 60s. Not production tested.
ISO
Note 7: Capacitance is measured with all field-side pins tied together and all logic-side pins tied together.
Note 8: Devices are immersed in oil during surge characterization.
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Analog Devices | 7
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
ESD and Transient Immunity Characteristics
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IEC 61000-4-5, 1.2/50µs pulse, minimum
10kΩ resistor in series with IN_F
IN_F to GNDF
±1
IEC 61000-4-5, 1.2/50µs pulse, minimum
10kΩ resistor in series with IN_F
IN_F to IN_F
IN_F to Earth
±2
Surge
kV
IEC 61000-4-5, 1.2/50µs pulse, minimum
10kΩ resistor in series with IN_F, 220pF
Y capacitor between GNDL and Earth or
GNDL is shorted to Earth
±10
IEC 61000-4-4, 5kHz or 100kHz
repetition frequency, minimum 10kΩ
resistor in series with IN_F
EFT
IN_F
±4
±8
kV
IEC 61000-4-2, Contact discharge,
minimum 10kΩ resistor in series with
IN_F
IN_F to GNDF
IEC 61000-4-2, Air-Gap discharge,
minimum 10kΩ resistor in series with
IN_F
±15
±15
ESD
Human Body Model, minimum 10kΩ
IN_F to Earth resistor in series with IN_F, 220pF Y
capacitor between GNDF and Earth
kV
Human Body Model, minimum 10kΩ
IN_F to GNDL resistor in series with IN_F, 220pF Y
capacitor between GNDF and GNDL
±15
±4
All other pins, Human Body Model
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Analog Devices | 8
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Typical Operating Characteristics
(V
- V
= +3.3V, V
= V
, C = 15pF, T = +25°C, unless otherwise noted.)
GNDF L A
DDL
GNDL
GNDL
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Analog Devices | 9
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Typical Operating Characteristics (continued)
(V
- V
= +3.3V, V
= V
, C = 15pF, T = +25°C, unless otherwise noted.)
GNDF L A
DDL
GNDL
GNDL
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Analog Devices | 10
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Pin Configuration
TOP VIEW
+
IN1F
1
2
3
4
8
7
6
5
OUT1L
OUT2L
MAX22517–MAX22519
IN2F
V
V
DDL
DDF
GNDF
GNDL
SOIC
Pin Description
REF
SUPPLY
PIN
INPUTS
1
NAME
FUNCTION
Field-Side Input 1. Corresponds to logic-side output 1. Place an optional minimum
10kΩ resistor between IN1F and the field input for protection.
IN1F
IN2F
GNDF
GNDF
Field-Side Input 2. Corresponds to logic-side output 2. Place an optional minimum
10kΩ resistor between IN2F and the field input for protection.
2
POWER
3
Field-Side Power Supply Output. Bypass V
to GNDF with 1000pF || 0.1μF
DDF
V
DDF
GNDF
ceramic capacitors as close as possible to the pin.
4
5
GNDF
GNDL
Field-Side Ground Reference
—
—
Logic-Side Ground Reference
Logic-Side Power Supply. Bypass V
as close as possible to the pin.
to GNDL with a 0.1μF ceramic capacitor
DDL
6
V
DDL
GNDL
OUTPUTS
Logic-Side Output 2. OUT2L is the logic output for the IN2F input on the field side.
OUT2L is an open-drain output in the MAX22518 and MAX22519, so connect a
7
8
OUT2L
OUT1L
GNDL
GNDL
pullup resistor between OUT2L and V
MAX22517.
. OUT2L is a push-pull output in the
DDL
Logic-Side Output 1. OUT1L is the logic output for the IN1F input on the field side.
OUT1L is an open-drain output in the MAX22518 and MAX22519, so connect a
pullup resistor between OUT1L and V
MAX22517.
. OUT1L is a push-pull output in the
DDL
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Analog Devices | 11
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Functional Diagrams
MAX22517
MAX22517
CHARGE
PUMP
IN1F
OUT1L
OUT2L
PUSH-
PULL
IN2F
PUSH-
PULL
V
V
DDL
DDF
µPOWER DC-DC
GNDF
GNDL
MAX22518
MAX22518
CHARGE
PUMP
IN1F
IN2F
OUT1L
OUT2L
OPEN-
DRAIN
OPEN-
DRAIN
V
V
DDL
DDF
µPOWER DC-DC
GNDF
GNDL
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Analog Devices | 12
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
MAX22519
MAX22519
IN1F
OUT1L
OUT2L
OPEN-
DRAIN
IN2F
OPEN-
DRAIN
V
V
DDL
DDF
µPOWER DC-DC
GNDF
GNDL
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Analog Devices | 13
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Detailed Description
The MAX22517–MAX22519 are a family of dual-channel digital galvanic isolators with integrated field-side supply. The
field-side power is supplied by the logic side through an integrated isolated DC-DC converter. All of the devices in
the family feature basic isolation with an isolation rating of 3.5kV
for 60s. This family of digital isolators offers
RMS
low-power operation, high electromagnetic interference (EMI) immunity, and stable temperature performance through
Maxim’s proprietary process technology.
The devices isolate different ground domains and block high-voltage/high-current transients from sensitive or human
interface circuitry. With a single resistor on each input, the inputs of the MAX22517-MAX22519 can withstand 1.2/50μs
surge pulses up to ±2kV between inputs (common mode) or up to ±1kV between input and field-ground (differential), as
well as continuous short to 24VAC. The MAX22517–MAX22519 provide compact, reliable, and cost-efficient solutions for
applications such as industrial IoT, industrial networking systems, and building automation.
Both channels of the MAX22517–MAX22519 transfer data from the field side to the logic side and are always enabled.
The device senses the field-side voltage at the IN1F and IN2F pins and compares it against the internal reference levels
to determine whether the input is on (logic 1) or off (logic 0). The input state is then transferred to the logic-side output
through the capacitive isolation barrier. The inputs of the MAX22517 and MAX22518 feature a boost voltage that provides
enough wetting current to clean relay contacts that makes them ideal for use in relay contact detection applications.
Isolated Field-Side Power Supply
As shown in the Functional Diagrams, the logic-side supply V
powers an integrated DC-DC converter that generates
DDL
a nominal 3.3V output (V
) on the field side. When the input data rate is less than 100kbps, the isolated DC-DC
DDF
converter provides enough current to power the field side of the MAX22517–MAX22519 as well as up to 220μA to
external circuits, such as a window comparator or relay contact detection circuit. This approach eliminates the bulky and
expensive external isolated power supply when the power demand of the field side is small.
Digital Isolation
The MAX22517–MAX22519 provide basic galvanic isolation for both power and digital signals that are transmitted from
the field side to the logic side. The devices withstand differences in ground potential between the two power domains
of up to 3.5kV
(V
) for up to 60s, and up to 445V
(V
) for extended periods of time. See Table 1 for
RMS
ISO
RMS
IOWM
certification information. The devices withstand surge voltages up to 10kV (1.2/50μs pulses).
All of the devices in the MAX22517–MAX22519 family are available in a 8-pin wide-body SOIC package with 5.5mm of
creepage and clearance. The package material has a minimum comparative tracking index (CTI) of 400 to give it a group
II rating in creepage tables.
Table 1. Safety Regulatory Approvals
UL
The MAX22517–MAX22519 are certified under UL1577. For more details, refer to File E351759.
Rated up to 3500V
isolation voltage for single protection.
RMS
cUL (Equivalent to CSA notice 5A)
The MAX22517–MAX22519 are certified up to 3500V
for single protection. For more details, refer to File E351759.
RMS
Field Input Charge Pump
The MAX22517 and MAX22518 are equipped with a built-in charge pump at the IN1F and IN2F pins, which makes
the devices ideal for use in relay contact detection applications. The charge pump charges the external capacitor with
a nominal 5.25V boost voltage providing a typical 5μA boost current. When the input is connected to a relay and the
relay contact is switched to the closed position, the charge stored in the capacitor provides enough energy to clean any
residual oxidation on the relay contact. The input series resistor should be carefully selected to allow enough current to
charge the external capacitor while protecting the field inputs from surge pulses and continuous shorts to 24VAC.
The MAX22519 does not come with input charge pumps. Instead, it features internal pullup current sources to V
the IN1F and IN2F pins.
at
DDF
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Analog Devices | 14
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Field Input Protection
With a single input series resistor of 10kΩ or greater, the input pins (IN1F and IN2F) of the MAX22517–MAX22519 are
protected from 1.2/50μs surge pulses up to ±2kV between inputs (common mode) or up to ±1kV between input and field
ground (differential), as well as continuous shorts to 24VAC. See the ESD and Transient Immunity Characteristics table
for details.
When a discharging capacitor is used to clean the oxidation growth on the relay contact, a TVS is recommended to
protect it, unless the capacitor is sized properly for the application. See the Typical Application Circuits section for details.
Unidirectional Channels and Logic Outputs
Both channels of the MAX22517–MAX22519 are unidirectional; they only pass data from the field side to the logic side,
as indicated in the Functional Diagrams section.
Both sides of the isolators are powered from a single 3.0V to 5.5V supply on the logic side, which also sets the output
logic level. This family of the devices offers two different types of the output drivers. The MAX22517 features push-pull
output drivers with an output-high default state. The MAX22518 and MAX22519 have open-drain output drivers with a
high-impedance output default state. The default is the state the output assumes when either power domain of the device
is undervoltage or the input is open-circuit. The open-drain output requires a pullup resistor between the OUT_L pins and
V
DDL
. See the Ordering Information for part numbers associated with different input and output options.
Startup and Undervoltage Lockout
The V
and V
supplies are both internally monitored for undervoltage conditions. Undervoltage events can occur
DDL
DDF
during power-up, power-down, or during normal operation due to a sagging supply voltage on V
, or heavy loads on
DDL
V
DDF
. When an undervoltage condition is detected on either supply, all outputs go to their default states regardless of
the state of the inputs (Table 2 and Table 3). Figure 3 through Figure 6 show the behavior of the outputs during power-up
and power-down.
The internal DC-DC converter still operates when V
(MAX22517 and MAX22518 only) stop operating when V
is in UVLO (2.82V, typ). The field input charge pumps
is in UVLO (2.1V, typ).
DDL
DDF
Table 2. MAX22517 Output Behavior During Undervoltage Conditions
V
IN_F
V
DDF
V
DDL
V
OUT_L
1
Powered
Powered
Powered
Powered
High
0
X
X
Low
High
High
Undervoltage
Don’t care
Powered
Undervoltage
Note: The internal DC-DC converter still operates when V
is in UVLO (2.82V, typ).
DDL
Table 3. MAX22518/MAX22519 Output Behavior During Undervoltage Conditions
V
V
V
DDL
V
OUT_L
IN_F
DDF
1
Powered
Powered
Powered
Powered
High impedance
Low
0
X
X
Undervoltage
Don’t care
Powered
High impedance
High impedance
Undervoltage
Note: The internal DC-DC converter still operates when V
is in UVLO (2.82V, typ).
DDL
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Analog Devices | 15
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Figure 3. Undervoltage Lockout Behavior (MAX22517, Input Unconnected)
Figure 4. Undervoltage Lockout Behavior (MAX22518, Input Unconnected)
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Analog Devices | 16
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Figure 5. Undervoltage Lockout Behavior (MAX22517, Input Low)
Figure 6. Undervoltage Lockout Behavior (MAX22518/MAX22519, Input Low)
Safety Limits
Damage to the IC can result in a low-resistance path to ground or to the supply and, without current limiting, the
MAX22517–MAX22519 can dissipate excessive amounts of power. Excessive power dissipation can damage the die and
result in damage to the isolation barrier, potentially causing long-term reliability issues. Table 4 shows the safety limits
for the MAX22517–MAX22519.
The maximum safety temperature (T ) for the device is the 150°C maximum junction temperature specified in the
S
Absolute Maximum Ratings section. The power dissipation (P ) and junction-to-ambient thermal impedance (θ
)
D
JA
determine the junction temperature. Thermal impedance values (θ and θ ) are available in the Package Information
JA
JC
section of the data sheet. Calculate the junction temperature (T ) as:
J
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Analog Devices | 17
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
T = T + (P × θ )
JA
J
A
D
Figure 7 and Figure 8 show the thermal derating curve for safety limiting the power and the current of the device. Ensure
that the junction temperature does not exceed 150°C.
Table 4. Safety Limiting Values for the MAX22517–MAX22519
PARAMETER
SYMBOL
TEST CONDITIONS
MAX
UNIT
Safety Current on Any Pin
I
T = +150°C, T = +25°C
200
mA
S
J
A
(No Damage to Isolation Barrier)
Total Safety Power Dissipation
Maximum Safety Temperature
P
T
T = +150°C, T = +25°C
1174
150
mW
°C
S
J
A
S
Figure 7. Thermal Derating Curve for Safety Power Limiting
Figure 8. Thermal Derating Curve for Safety Current Limiting
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Analog Devices | 18
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Applications Information
Power-Supply Decoupling
To reduce ripple and the chance of introducing data errors, bypass V
with a 0.1μF low-ESR ceramic capacitor to
DDL
GNDL, and place the bypass capacitor as close to the V
pin as possible.
DDL
The V
pin is the integrated DC-DC converter output. It is recommended to decouple it with low-ESR capacitors, 0.1μF
DDF
in parallel with 1000pF, to GNDF. Place the 1000pF capacitor as close as possible to the V
pin.
DDF
Layout Considerations
The PCB designer should follow some critical recommendations in order to get the best performance from the design.
● Keep the input/output traces as short as possible. To keep signal paths low-inductance, avoid using vias.
● Have a solid ground plane underneath the signal layer to minimize the noise.
● Keep the area underneath the MAX22517–MAX22519 free from ground and signal planes. Any galvanic or metallic
connection between the field side and logic side defeats the isolation.
Typical Application Circuits
The MAX22517 and MAX22518 are designed for relay contact detection applications. The relay state is continuously
monitored by the inputs, and transmitted across the isolation barrier to the logic side. The output pins indicate the real-
time relay status. See the Typical Application Circuits section for details.
The input charge pump provides a nominal 5.25V voltage and a typical 5μA current to charge an external capacitor.
When the relay contact is switched to the closed position, the energy stored in the capacitor cleans the relay of any
oxidation residue. The input pins are also protected from hazardous high-voltage transients such as ±1kV input-to-GNDF
surge with a single input series resistor per channel.
When the input data rate is less than 100kbps, the isolated field-side supply output V
is able to supply up to 220μA
DDF
to power external field-side circuits such as window comparators or other relay detection circuits.
When the field-side power collapses or is lost, the outputs enter the default state so that the logic-side control unit is not
falsely informed a relay is closed.
Radiated Emission
The MAX22517–MAX22519 feature an integrated DC-DC converter to generate a nominal 3.3V supply, powering the
field side of the MAX22517–MAX22519 as well as external circuits that consume less than 220μA power. The DC-DC
converter uses a switching frequency of 750MHz (typ) to pass power from the logic side across the isolation barrier
through an internal transformer. Due to the isolated nature of the device, the split of the ground planes (GNDL and
GNDF) prevents the return current from flowing back to the logic side, thus causing high-frequency signals to radiate
when crossing the isolation barrier.
The MAX22517–MAX22519 can meet CISPR 22 and FCC radiated emission standards with proper PCB design. A
stitching capacitance of 30pF minimum is recommended to be built into the PCB to pass the CISPR 22 and FCC Class
B limits. See Figure 11 and Figure 12.
To achieve optimal radiated emission performance, the following layout guidelines are recommended:
● Use at least 4-layer PCB stackup with GNDL and GNDF ground planes on two adjacent internal layers.
● Extend the GNDF and GNDL planes on two adjacent layers so they overlap each other, thus creating a stitching
capacitance between GNDL and GNDF. See Figure 9 and Figure 10.
● Calculate the stitching capacitance value by using the following equation, where A is the overlapping area between
-12
the GNDL and GNDF planes, ε is the permittivity of free space (8.854 x 10
F/m), ε is the relative permittivity of
R
0
the PCB insulation material, and d is the dielectric thickness between two adjacent layers.
A × ε × ε
0
r
C =
d
● Adjust the overlapping area A or the dielectric thickness d to achieve a minimum 30pF stitching capacitance. Make
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Analog Devices | 19
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
sure that the creepage and clearance between the GNDF plane and the GNDL plane on the same layer as well as
between two different layers are large enough to meet isolation standards for various applications.
● Multiple GNDL and GNDF vias are recommended to be placed next to the GNDF and GNDL pins to provide a good
connection between the stitching capacitor and the device ground pins.
● Apply edge guarding vias to stitch the GNDF and GNDL planes on all layers together to limit the emission from
escaping from the PCB edges.
MAX22517-MAX22519
GNDF
GNDF
GNDF
GNDF
GNDL
GNDL
GNDL
GNDL
TOP LAYER
2ND LAYER
d
3RD LAYER
A
BOTTOM LAYER
GNDF VIAS
5.5mm
GNDL VIAS
STITCHING CAPACITANCE
Figure 9. Stitching Capacitance Example on a 4-Layer PCB
GNDF
GNDL
GNDF
GNDL
Figure 10. Stitching Capacitance on Internal Layers
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Analog Devices | 20
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Figure 11. Radiated Emission with 50pF Stitching Capacitance, 3-Meter Antenna Distance, Horizontal Scan
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Analog Devices | 21
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Figure 12. Radiated Emission with 50pF Stitching Capacitance, 3-Meter Antenna Distance, Vertical Scan
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Analog Devices | 22
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Typical Application Circuits
Dual Relay Contact Monitoring System
3.3V
MAX22517
27kΩ
V
V
DDL
DDF
µPOWER DC-DC
0.1µF
0.1µF
1000pF
27kΩ
10kΩ
CHARGE
PUMP
MICRO-
CONTROLLER
RELAY CONTACT
IN1F
IN2F
OUT1L
GPI1
C
C
RELAY_DIS
10kΩ
OUT2L
GNDL
GPI2
RELAY_DIS
GNDF
Single-Channel Relay Contact Monitoring With Self-Diagnostics
5V
MAX22518
27kΩ
V
V
DDL
DDF
µPOWER DC-DC
0.1µF
1000pF
0.1µF
CHARGE
PUMP
MICRO-
CONTROLLER
RELAY CONTACT
10kΩ
IN1F
IN2F
OUT1L
GPI1
C
RELAY_DIS
OUT2L
GNDL
GPI2
GNDF
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Analog Devices | 23
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Typical Application Circuits (continued)
Isolated Power Monitoring System
3.3V
MAX22519
VBUS+
V
V
DDL
DDF
µPOWER DC-DC
0.1µF
1000pF
0.1µF
MICRO-
CONTROLLER
WINDOW COMPARATOR
(MAX9042/MAX9052)
IN1F
OUT1L
GPI1
REFERENCE
VOLTAGE
IN2F
OUT2L
GNDL
GPI2
GNDF
VBUS-
Ordering Information
ISOLATION RATING
(V
PART NUMBER
IN_F CHARGE PUMP
OUT_L DEFAULT
OUT_L TYPE
PIN-PACKAGE
)
RMS
MAX22517AWA+
MAX22518AWA+
MAX22519AWA+
3500
3500
3500
Yes
Yes
No
High
Push-pull
Open drain
Open drain
8 Wide SOIC
8 Wide SOIC
8 Wide SOIC
High impedance
High impedance
+Denotes a lead(Pb)-free/RoHS-compliant package.
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Analog Devices | 24
MAX22517-MAX22519
Self-Powered, 2-Channel, 3.5kV
Digital
RMS
Isolator
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
1/20
Initial release
—
Updated CTI to 400 in General Description, added MAX22517 to Pulse Width
Distortion test condition in the Dynamic Characteristics table, updated CTI to 400 in
the Digital Isolation section, removed future product designation from
MAX22517AWA+ and MAX22519AWA+ in the Ordering Information
1
9/21
1, 4, 14, 24
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.
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Analog Devices | 25
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