Si88x4x Data Sheet
Quad Digital Isolators with DC-DC Converter
KEY FEATURES
The Si88xx integrates Silicon Labs’ proven digital isolator technology with an on-chip
isolated dc-dc converter that provides regulated output voltages of 3.3 or 5.0 V (or >5 V
with external components) at peak output power levels of up to 5 W. These devices pro-
vide up to four digital channels. The dc-dc converter has user-adjustable frequency for
minimizing emissions, a soft-start function for safety, a shut-down option and loop com-
pensation. The device requires only minimal passive components and a miniature trans-
former.
The ultra-low-power digital isolation channels offer substantial data rate, propagation de-
lay, size and reliability advantages over legacy isolation technologies. Data rates up to
100 Mbps max are supported, and all devices achieve propagation delays of only 23 ns
max. Ordering options include a choice of dc-dc converter features, isolation channel
configurations and a failsafe mode. All products are certified by UL, CSA, VDE, and
CQC.
Automotive Grade is available for certain part numbers. These products are built using
automotive-specific flows at all steps in the manufacturing process to ensure the robust-
ness and low defectivity required for automotive applications.
Industrial Applications
• Industrial automation systems
• Medical electronics
• Isolated switch mode supplies
• Inverters
• Data Acquisition
• Motor control
• PLCs, distributed control systems
Automotive Applications
• Hybrid electric and electric vehicles
• Traction inverters
• Battery management systems
• Vehicle communication busses
• High-speed isolators with integrated dc-dc
converter
• Fully-integrated secondary sensing
feedback-controlled converter with
dithering for low EMI
• dc-dc converter peak efficiency of 83%
with external power switch
• Up to 5 W isolated power with external
power switch
• Options include dc-dc shutdown, frequency
control, and soft start
• Standard Voltage Conversion
• 3/5 V to isolated 3/5 V
• 24 V to isolated 3/5 V supported
• Precise timing on digital isolators
• 0–100 Mbps
• 18 ns typical prop delay
• Highly-reliable: 100 year lifetime
• High electromagnetic immunity and ultra-
low emissions
• RoHS compliant packages
• SOIC-20 wide body
• SOIC-24 wide body
• Isolation of up to 5000 V
RMS
• High transient immunity of 100 kV/µs
(typical)
• AEC-Q100 qualified
• Wide temp range: -40 to +125°C
Safety Regulatory Approvals
• UL 1577 recognized
• Up to 5000 V
RMS
for 1 minute
• CSA component notice 5A approval
• IEC 60950
• VDE certification conformity
• VDE0884-10
• CQC certification approval
• GB4943.1
• Automotive-grade OPNs available
• AIAG compliant PPAP documentation
support
• IMDS and CAMDS listing support
silabs.com
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Rev. 1.01
Table of Contents
1. Feature List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Ordering Guide
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Theory of Operation .
3.2 Digital Isolation
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. 8
. 8
. 9
. 9
. 9
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.10
.10
.10
.11
.12
.13
.14
.15
3.3 DC-DC Converter Application Information . . .
3.3.1 Shutdown . . . . . . . . . . . .
3.3.2 Soft-Start . . . . . . . . . . . .
3.3.3 Programmable Frequency. . . . . . .
3.3.4 External Transformer Driver . . . . . .
3.3.5 VREGA, VREGB . . . . . . . . . .
3.3.6 Output Voltage Control . . . . . . . .
3.3.7 Compensation. . . . . . . . . . .
3.3.8 Thermal Protection . . . . . . . . .
3.3.9 Cycle Skipping . . . . . . . . . .
3.3.10 Low-Voltage Configuration . . . . . .
3.3.11 Low-Voltage to High-Voltage Configuration
3.3.12 High-Voltage to Low-Voltage Configuration
3.3.13 High-Voltage Configuration . . . . . .
3.4 Transformer Design .
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4. Digital Isolator Device Operation . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Device Startup
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.17
.17
.17
.17
.18
.18
.19
4.2 Undervoltage Lockout .
4.3 Layout Recommendations. .
4.3.1 Supply Bypass . . .
4.3.2 Output Pin Termination.
4.4 Fail-Safe Operating Mode .
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4.5 Typical Performance Characteristics .
5. Electrical Specifications
6. Pin Descriptions
. . . . . . . . . . . . . . . . . . . . . . . . . . 24
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.37
5.1 Calculating Total Current Consumption .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
43
7. Package Outline: 20-Pin Wide Body SOIC. . . . . . . . . . . . . . . . . . . .
8. Land Pattern: 20-Pin SOIC
. . . . . . . . . . . . . . . . . . . . . . . . . 45
46
9. Package Outline: 24-Pin Wide Body SOIC. . . . . . . . . . . . . . . . . . . .
10. Land Pattern: 24-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . 48
11. Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.1 Si88x4x Top Marking (20-Pin Wide Body SOIC) .
silabs.com
| Building a more connected world.
49
.49
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Rev. 1.01 | 2
11.2 Top Marking Explanation (20-Pin Wide Body SOIC).
11.3 Si88x4x Top Marking (24-Pin Wide Body SOIC) .
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11.4 Top Marking Explanation (24-Pin Wide Body SOIC).
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.49
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12. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
silabs.com
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Rev. 1.01 | 3
Si88x4x Data Sheet
Feature List
1. Feature List
•
•
•
•
•
•
High-speed isolators with integrated dc-dc converter
Fully-integrated secondary sensing feedback-controlled converter with dithering for low EMI
dc-dc converter peak efficiency of 83% with external power switch
Up to 5 W isolated power with external power switch
Options include dc-dc shutdown, frequency control, and soft start
Standard Voltage Conversion
• 3/5 V to isolated 3/5 V
• 24 V to isolated 3/5 V supported
Precise timing on digital isolators
• 0–100 Mbps
• 18 ns typical prop delay
Highly-reliable: 100 year lifetime
High electromagnetic immunity and ultra-low emissions
RoHS compliant packages
• SOIC-20 wide body
• SOIC-24 wide body
Isolation of up to 5000 V
RMS
•
•
•
•
•
• High transient immunity of 100 kV/µs (typical)
• AEC-Q100 qualified
• Wide temp range: -40 to +125°C
silabs.com
| Building a more connected world.
Rev. 1.01 | 4
Si88x4x Data Sheet
Ordering Guide
2. Ordering Guide
Table 2.1. Si88x4x Ordering Guide
1,2,3,4
Ordering
Part Number
Available Now
Si88240BC-IS
Si88240EC-IS
Si88241BC-IS
Si88241EC-IS
Si88242BC-IS
Si88242EC-IS
Si88243BC-IS
Si88243EC-IS
Si88244BC-IS
Si88244EC-IS
Si88340EC-IS
Si88341EC-IS
Si88342EC-IS
Si88343EC-IS
Si88344EC-IS
Si88440EC-IS
Si88441EC-IS
Si88442EC-IS
Si88443EC-IS
Si88444EC-IS
Si88640EC-IS
Si88641EC-IS
Si88642EC-IS
Si88643EC-IS
Si88644EC-IS
Sample Now
Si88240BD-IS
Si88240ED-IS
Si88241BD-IS
Y
Y
Y
N
N
N
N
N
N
N
N
N
4
4
3
0
0
1
5.0 kV
RMS
5.0 kV
RMS
5.0 kV
RMS
WB SOIC-20
WB SOIC-20
WB SOIC-20
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
N
N
N
Y
Y
Y
Y
Y
N
N
N
N
N
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
N
N
N
Y
Y
Y
Y
Y
N
N
N
N
N
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
4
4
3
3
2
2
1
1
0
0
4
3
2
1
0
4
3
2
1
0
4
3
2
1
0
0
0
1
1
2
2
3
3
4
4
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
3.75 kV
RMS
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-24
WB SOIC-24
WB SOIC-24
WB SOIC-24
WB SOIC-24
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-24
WB SOIC-24
WB SOIC-24
WB SOIC-24
WB SOIC-24
DC-DC
Shutdown
Soft
Frequency
Start
Control
Control
External
Switch
Forward
Digital
Channels
Reverse
Digital
Channels
Insulation
Rating
Package
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