Si88x2x Data Sheet
Dual 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 two digital channels. The dc-dc converter has user-adjustable frequency for
minimizing emissions, a soft-start function for safety, a shutdown 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 fail-safe mode. All products are certified by UL, CSA, VDE, and
CQC.
• 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
• 3/5 V to isolated 24 V
• 24 V to isolated 24 V
Applications:
•
•
•
•
Industrial automation systems
Hybrid electric and electric vehicles
Isolated power supplies
Inverters
• Data acquisition
• Motor control
• PLCs, distributed control systems
• 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
Safety Approval (Pending):
• UL 1577 recognized
• Up to 5000 Vrms for 1 minute
• CSA component notice 5A approval
• IEC 60950
• VDE certification conformity
• VDE0884-10
• CQC certification approval
• GB4943.1
• SOIC-16 wide body
• Isolation of up to 5000 Vrms
• High transient immunity of 100 kV/µs
(typical)
• AEC-Q100 qualified
• Wide temp range
• –40 to +125 °C
silabs.com
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Rev. 1.0
Table of Contents
1. Features List
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Ordering Guide
3. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Theory of Operation .
3.2 Digital Isolation
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. 7
. 7
. 8
. 8
. 8
. 8
. 8
. 8
. 8
. 9
. 9
. 9
.10
.11
.12
.13
.14
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 to High-Voltage Configuration
3.4 Transformer Design .
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4. Electrical Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . 16
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.28
4.1 Calculating Total Current Consumption .
5. Digital Isolator Device Operation . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Device Startup
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.29
.29
.29
.29
.29
.30
.30
5.2 Undervoltage Lockout .
5.3 Layout Recommendations. .
5.3.1 Supply Bypass . . .
5.3.2 Output Pin Termination.
5.4 Fail-Safe Operating Mode .
.
5.5 Typical Performance Characteristics .
6. Pin Descriptions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
39
.39
.41
7. Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Package Outline: 20-Pin Wide Body SOIC .
7.2 Package Outline: 16-Pin Wide Body SOIC .
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8. Land Patterns
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
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.43
.44
8.1 Land Pattern: 20-Pin SOIC
8.2 Land Pattern: 16-Pin Wide-Body SOIC
9. Top Markings
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Rev. 1.0 | 2
silabs.com
| Building a more connected world.
9.1 Si88x2x Top Marking: 20-Pin Wide Body SOIC.
9.2 Si88x2x Top Marking: 16-Pin Wide Body SOIC.
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.45
.46
10. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
47
silabs.com
| Building a more connected world.
Rev. 1.0 | 3
Si88x2x Data Sheet
Features List
1. Features List
• High-speed isolators with integrated dc-dc converter
• Fully-integrated secondary sensing feedback-controlled con-
verter 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
• 3/5 V to isolated 24 V
• 24 V to isolated 24 V
• 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-16 wide body
• Isolation of up to 5000 Vrms
• 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. 1.0 | 4
Si88x2x Data Sheet
Ordering Guide
2. Ordering Guide
Table 2.1. Si88x2x Ordering Guide
1,2,3,4
Ordering Part
Number
Available Now
Si88220BC-IS
Si88221BC-IS
Si88222BC-IS
Si88320BC-IS
Si88321BC-IS
Si88322BC-IS
Si88420BC-IS
Si88421BC-IS
Si88422BC-IS
Si88620BC-IS
Si88621BC-IS
Si88622BC-IS
Si88220EC-IS
Si88221EC-IS
Si88222EC-IS
Si88320EC-IS
Si88321EC-IS
Si88322EC-IS
Si88420EC-IS
Si88421EC-IS
Si88422EC-IS
Si88620EC-IS
Si88621EC-IS
Si88622EC-IS
Sampling Now
Si88220BD-IS
Si88221BD-IS
Si88222BD-IS
Si88320BD-IS
Si88321BD-IS
Si88322BD-IS
Y
Y
Y
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
N
N
N
2
1
0
2
1
0
0
1
2
0
1
2
5.0
5.0
5.0
5.0
5.0
5.0
WB SOIC-16
WB SOIC-16
WB SOIC-16
WB SOIC-20
WB SOIC-20
WB SOIC-20
Y
Y
Y
Y
Y
Y
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
N
N
N
N
N
N
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
Y
Y
Y
Y
Y
Y
2
1
0
2
1
0
2
1
0
2
1
0
2
1
0
2
1
0
2
1
0
2
1
0
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
3.75
WB SOIC-16
WB SOIC-16
WB SOIC-16
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-16
WB SOIC-16
WB SOIC-16
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-16
WB SOIC-16
WB SOIC-16
WB SOIC-20
WB SOIC-20
WB SOIC-20
WB SOIC-16
WB SOIC-16
WB SOIC-16
WB SOIC-20
WB SOIC-20
WB SOIC-20
DC-DC
Shutdown
Soft
Start
Frequency
Control
External
Switch
Forward
Digital
Reverse
Digital
Insulation
Rating
(kVrms)
Package
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Rev. 1.0 | 5
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