Quad-Channel Isolators with Integrated DC-to-DC Converter

The ADuM6420A/ADuM6421A/ADuM6422A1 from Analog Devices are quad-channel digital isolators with an isoPower®, integrated, isolated dc-to-dc converter. Based on the company’s iCoupler® technology, the dc-to-dc converter provides regulated, isolated power that meets CISPR 32/EN 55032 Class B limits at a full load on a 2-layer printed circuit board (PCB) with ferrites. The EVAL-ADUM6421A evaluation board is pictured above.

The ADuM6420A/ADuM6421A/ADuM6422A isolators provide four independent isolation channels. Applications are expected to include; RS-232 transceivers, Power supply start-up bias and gate drives, Isolated sensor interfaces, and Industrial programmable logic controllers (PLCs).

The ADuM6420A/ADuM6421A/ADuM6422A eliminate the need for a separate, isolated dc-to-dc converter in 500mW, isolated designs. The iCoupler chip scale transformer technology is used for isolated logic signals and for the magnetic components of the dc-to-dc converter. The result is a small form factor, total isolation solution.

Summary of Features and Benefits

• isoPower integrated, isolated dc-to-dc converter
• 100mA output supply
• Meets CISPR 32/EN550 32 Class B emission limits up to 5 Mbps at a full load on a 2-layer PCB
• Quad dc to 100 Mbps signal isolation channels
• 28-lead, fine pitch, SOIC with 8.3mm minimum creepage
• High temperature operation: 125°C maximum
• High common-mode transient immunity: 100kV/μs
• Safety and regulatory approvals (pending)
  • UL recognition (pending)
    • 5000V rms for 1 minute per UL 1577
  • CSA Component Acceptance Notice 5A (pending)
  • VDE V 0884-11 certificate of conformity (pending)
    • VIORM = 566V peak