Si88xx Automotive Digital Isolators with Integrated dc-dc Converter

Si88xx automotive products offer a complete isolation solution, combining high speed digital isolators with an isolated power supply. These products are ideal for automotive applications including battery management, PTC heaters, traction inverters, and on-board chargers.

Si88xx devices offer up to four high speed digital isolation channels integrated with a modified fly-back topology based dc-dc converter working in conjunction with an external transformer to provide up to 5 W of isolated power with a 24 V input supply. An external switch is used to supply the secondary side of the Si88xx, as well as other circuits on the isolated side with an isolated 5 V supply. The converter includes safety soft start, thermal detection, and cycle-by-cycle current limiting safety features, as well as built-in secondary sensing and feedback through the isolation barrier back to the controller, resulting in excellent line and load regulation for system stability.

dc-dc power converter
Up to 5 W of integrated power
dc-dc power converter
80% efficient
Automotive grade
AEC-Q100 qualification

Common Specs

Digital isolation

  • Precise timing on high speed 100 Mbps digital isolators, 23 ns typical propagation 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

dc-dc converter

  • Integrated dc-dc converter, up to 5 W power
  • Fully-integrated, secondary sensing, feedback controlled converter with dithering for low EMI
  • 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

Automotive grade products

  • True automotive grade products with automotive qualification, manufacturing, production test, and support
  • AEC-Q100 qualification
  • dc-dc converter efficiency of 83%
  • PPAP documentation and material listing system support (IMDS, CAMDS)
  • –40 to +125 °C temperature range


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