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 High-speed isolators with integrated dc-dc
converter
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 Fully-integrated secondary sensing
feedback-controlled converter with
minimizing emissions, a soft-start function for safety, a shut-down option and loop com-
dithering for low EMI
pensation. The device requires only minimal passive components and a miniature trans-
former. dc-dc converter peak efficiency of 83%
with external power switch
The ultra-low-power digital isolation channels offer substantial data rate, propagation de-
Up to 5 W isolated power with external
lay, size and reliability advantages over legacy isolation technologies. Data rates up to
power switch
100 Mbps max are supported, and all devices achieve propagation delays of only 23 ns
Options include dc-dc shutdown, frequency
max. Ordering options include a choice of dc-dc converter features, isolation channel
control, and soft start
configurations and a failsafe mode. All products are certified by UL, CSA, VDE, and
Standard Voltage Conversion
CQC.
3/5 V to isolated 3/5 V
24 V to isolated 3/5 V supported
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- Precise timing on digital isolators
ness and low defectivity required for automotive applications.
0100 Mbps
18 ns typical prop delay
Industrial Applications Automotive Applications
Highly-reliable: 100 year lifetime
Industrial automation systems Hybrid electric and electric vehicles
High electromagnetic immunity and ultra-
low emissions
Medical electronics Traction inverters
RoHS compliant packages
Isolated switch mode supplies Battery management systems
SOIC-20 wide body
Inverters Vehicle communication busses
SOIC-24 wide body
Data Acquisition
Isolation of up to 5000 V
RMS
Motor control
High transient immunity of 100 kV/s
PLCs, distributed control systems
(typical)
AEC-Q100 qualified
Wide temp range: -40 to +125C
Safety Regulatory Approvals
Automotive-grade OPNs available
AIAG compliant PPAP documentation
UL 1577 recognized VDE certification conformity
support
Up to 5000 V for 1 minute VDE0884-10
RMS
IMDS and CAMDS listing support
CQC certification approval
CSA component notice 5A approval
GB4943.1
IEC 60950
silabs.com | Building a more connected world. Rev. 1.01 Table of Contents
1. Feature List................................4
2. Ordering Guide ..............................5
3. Functional Description............................8
3.1 Theory of Operation............................8
3.2 Digital Isolation .............................8
3.3 DC-DC Converter Application Information ....................9
3.3.1 Shutdown .............................9
3.3.2 Soft-Start .............................9
3.3.3 Programmable Frequency........................9
3.3.4 External Transformer Driver.......................9
3.3.5 VREGA, VREGB...........................9
3.3.6 Output Voltage Control.........................9
3.3.7 Compensation............................10
3.3.8 Thermal Protection..........................10
3.3.9 Cycle Skipping ...........................10
3.3.10 Low-Voltage Configuration.......................11
3.3.11 Low-Voltage to High-Voltage Configuration .................12
3.3.12 High-Voltage to Low-Voltage Configuration .................13
3.3.13 High-Voltage Configuration.......................14
3.4 Transformer Design............................15
4. Digital Isolator Device Operation ....................... 17
4.1 Device Startup .............................17
4.2 Undervoltage Lockout ...........................17
4.3 Layout Recommendations..........................17
4.3.1 Supply Bypass ...........................17
4.3.2 Output Pin Termination.........................18
4.4 Fail-Safe Operating Mode..........................18
4.5 Typical Performance Characteristics ......................19
5. Electrical Specifications .......................... 24
5.1 Calculating Total Current Consumption .....................37
6. Pin Descriptions ............................. 38
7. Package Outline: 20-Pin Wide Body SOIC.................... 43
8. Land Pattern: 20-Pin SOIC ......................... 45
9. Package Outline: 24-Pin Wide Body SOIC.................... 46
10. Land Pattern: 24-Pin SOIC ......................... 48
11. Top Markings.............................. 49
11.1 Si88x4x Top Marking (20-Pin Wide Body SOIC)..................49
silabs.com | Building a more connected world. Rev. 1.01 | 2