ADuM347x Isolated DC/DC Controller


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ADuM347x Isolated DC/DC Controller

Analog Devices ADuM347x Isolated DC/DC Controller

Featuring a quad iCoupler® digital isolator from Analog Devices

Analog Devices’ ADuM347x device is a quad-channel digital isolator with an integrated transformer driver for an isolated DC/DC converter.

Based on Analog Devices’ iCoupler® technology, the DC/DC converter provides up to 2W of regulated, isolated power at 3.3V to 24V from a 5.0V input supply or from a 3.3V supply. This eliminates the need for a separate, isolated DC/DC converter in up to 2W isolated designs.

The iCoupler chip-scale transformer technology is used to isolate the logic signals, and the integrated transformer driver with isolated secondary side control provides higher efficiency for the isolated DC/DC converter. The result is a small form factor, total isolation solution.


  • Integrated transformer driver for isolated DC/DC converter
  • Regulated adjustable output: 3.3V to 24V
  • 2W output power
  • 70% efficiency at maximum load of 400mA at 5.0V output
  • Quad DC-to-25Mbps (NRZ) signal isolation channels
  • Schmitt trigger inputs
  • 20-lead SSOP package
  • High temperature operation: 105°C
  • High common-mode transient immunity: >25kV/µs
  • 200kHz to 1MHz oscillator frequency with adjust function
  • Soft start function at power-up
  • Pulse-by-pulse overcurrent protection
  • Thermal shutdown
  • 2500Vrms isolation


  • RS-232/RS-422/RS-485 transceivers
  • Industrial field bus isolation
  • Power supply startup bias and gate drives
  • Isolated sensor interfaces
  • Process controls