Si88xx Digital Isolators with Integrated dc-dc Converter

The new additions to the Si88xx family of products combine high speed digital isolators with an isolated power supply. This integrated product for signal and power isolation provides a complete isolation solution to designers. The Si88xx has up to four high speed digital isolation channels integrated with a modified fly-back topology based dc-dc converter. The dc-dc converter works in conjunction with an external transformer to provide up to 5W of isolated power with a 24V input supply and an external switch to supply the secondary side of the Si88xx as well as other circuits on the isolated side with an isolated 5V supply. The converter provides a high efficiency of 83%. It includes built-in secondary sensing and feedback through the isolation barrier back to the controller to achieve excellent line and load regulation for system stability. The converter also includes safety features like soft start, thermal detection and cycle by cycle current limiting.

The Si88xx has very low EMI emissions due to the dithering technique used by the converter as well as Silicon Labs’ proprietary low noise capacitive based signal isolation. This signal isolation technology has excellent timing characteristics like low propagation delay and low jitter as well as providing the longest lifetimes at high voltages. These products are ideal solutions for applications like industrial automation, PLCs, battery management systems and motor control that require long-term performance and product warranties.

Features

  • Digital isolation
    • Precise timing on high speed 100 Mbps digital isolators, 23 ns typ prop delay
    • Transient immunity of 100 kV/µs typical
    • High electro-magnetic immunity and ultra-low emissions
    • Isolation of up to 5000 Vrms
    • Highly-reliable: 100 year lifetime
    • RoHS compliant packages: SOIC-20 wide body
    • AEC-Q100 qualified
    • Wide temperature range: -40 to +125 °C
  • dc-dc converter
    • Integrated dc-dc converter, up to 5W power
    • Fully-integrated, secondary sensing, feedback controlled converter with dithering for low EMI
    • dc-dc converter efficiency of 83%
    • dc-dc shutdown, programmable frequency control and soft start
    • Conversion from 3/5 V to isolated 3/5 V, 24 V to isolated 3/5 V supported




Si88xx Product Matrix

Common Specifications

Channel Type: Unidirectional

Integrated Pull-Up: No

Temperature Range Min (°C): -40

Enable Control: No

10 Kv Surge: No

Temperature Range Max (°C): 125

Devices
Part Number Data Sheet Evaluation Kit Isolation Rating (kVrms) Max Propagation Delay (µs) Max Data Rate (bps) Forward Channels Reverse Channels Channel Type Unidirectional Channels Default Output State Input Supply Min (V) Input Supply Max (V) Output Supply Min (V) Output Supply Max (V) Integrated Pull-Up Enable Control Package Type 10 kV Surge AEC-Q100 Temperature Range Min (ºC) Temperature Range Max (ºC)
Si88xxxISO-KIT 3.75, 5 23 100 2 0 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC16 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 1 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC16 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 2 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC16 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 4 0 Unidirectional 4 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 3 1 Unidirectional 4 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 2 Unidirectional 4 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 3 Unidirectional 4 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 4 Unidirectional 4 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 0 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 1 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 2 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 4 0 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 3 1 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 2 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 3 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 4 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 0 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 1 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 2 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 4 0 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 3 1 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 2 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 3 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 4 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 0 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 1 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 2 Unidirectional 2 High, Low 3 5.5 3 5.5 No No WB SOIC20 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 4 0 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 3 1 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 2 2 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 1 3 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
Si88xxxISO-KIT 3.75, 5 23 100 0 4 Unidirectional 4 High 3 5.5 3 5.5 No No WB SOIC24 No Yes -40 125
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