Si88x2x Data Sheet Dual Digital Isolators with DC-DC Converter KEY FEATURES The Si88xx integrates Skyworks proven digital isolator technology with an on-chip isola- ted 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 provide up to two digital channels. The dc-dc converter has user-adjustable frequency Fully-integrated secondary sensing feedback-controlled converter with for minimizing emissions, a soft-start function for safety, a shutdown option and loop dithering for low EMI compensation. The device requires only minimal passive components and a miniature transformer. dc-dc converter peak efficiency of 83% with external power switch The ultra-low-power digital isolation channels offer substantial data rate, propagation Up to 5 W isolated power with external delay, size and reliability advantages over legacy isolation technologies. Data rates up power switch to 100 Mbps max are supported, and all devices achieve propagation delays of only 23 Options include dc-dc shutdown, frequency ns max. Ordering options include a choice of dc-dc converter features, isolation channel control, and soft start configurations and a fail-safe 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 3/5 V to isolated 24 V Applications: 24 V to isolated 24 V Precise timing on digital isolators Industrial automation systems Data acquisition 0 100 Mbps Hybrid electric and electric vehicles Motor control 18 ns typical prop delay Isolated power supplies PLCs, distributed control systems Highly-reliable: 100 year lifetime Inverters High electromagnetic immunity and ultra- low emissions RoHS compliant packages Safety Approval (Pending): SOIC-20 wide body SOIC-16 wide body UL 1577 recognized VDE certification conformity Isolation of up to 5000 Vrms Up to 5000 Vrms for 1 minute VDE0884-10, EN62368-1 High transient immunity of 100 kV/s CSA approval CQC certification approval (typical) IEC 60950-1, 62638-1 GB4943.1-2011 AEC-Q100 qualified Wide temp range 40 to +125 C Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 1.04 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 10, 2021 1Table of Contents 1. Features List ...............................4 2. Ordering Guide ..............................5 3. Functional Description............................7 3.1 Theory of Operation ............................7 3.2 Digital Isolation..............................7 3.3 DC-DC Converter Application Information.....................8 3.3.1 Shutdown ..............................8 3.3.2 Soft-Start ..............................8 3.3.3 Programmable Frequency.........................8 3.3.4 External Transformer Driver........................8 3.3.5 VREGA, VREGB............................8 3.3.6 Output Voltage Control..........................8 3.3.7 Compensation.............................9 3.3.8 Thermal Protection...........................9 3.3.9 Cycle Skipping ............................9 3.3.10 Low-Voltage Configuration ........................10 3.3.11 Low-Voltage to High-Voltage Configuration...................11 3.3.12 High-Voltage to Low-Voltage Configuration ..................12 3.3.13 High-Voltage to High-Voltage Configuration ..................13 3.4 Transformer Design ............................14 4. Electrical Specifications .......................... 16 4.1 Calculating Total Current Consumption......................28 5. Digital Isolator Device Operation....................... 29 5.1 Device Startup..............................29 5.2 Undervoltage Lockout ...........................29 5.3 Layout Recommendations..........................29 5.3.1 Supply Bypass ............................29 5.3.2 Output Pin Termination..........................29 5.4 Fail-Safe Operating Mode ..........................30 5.5 Typical Performance Characteristics.......................30 6. Pin Descriptions............................. 34 7. Package Outlines............................. 39 7.1 Package Outline: 20-Pin Wide Body SOIC.....................39 7.2 Package Outline: 16-Pin Wide Body SOIC.....................41 8. Land Patterns.............................. 43 8.1 Land Pattern: 20-Pin SOIC..........................43 8.2 Land Pattern: 16-Pin Wide-Body SOIC......................44 9. Top Markings .............................. 45 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 1.04 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 10, 2021 2