ADUM3473

PRODUCTION

Isolated Switching Regulators (1/3 Channel Directionality)

Analog Devices ADUM3473 Product Info

10 February 2026 3

Features

Isolated PWM Controller
Integrated transformer driver
Regulated adjustable output: 3.3 V to 24 V
2 W output power
70% efficiency at guaranteed load of 400 mA at 5.0 V output
Quad dc-to-25 Mbps (NRZ) signal isolation channels
20-lead SSOP package
High temperature operation: 105°C maximum
High common-mode transient immunity: >25 kV/μs
200 kHz to 1 MHz adjustable oscillator frequency

Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
Safety and regulatory approvals
- UL 1577
  - V_ISO = 2500 V rms for 1 minute
- IEC/EN/CSA 62368-1
- IEC/CSA 61010-1
- CQC GB 4943.1
- DIN EN IEC 60747-17 (VDE 0884-17)
  - V_IORM = 560 V peak
Qualified for automotive applications

Part details & applications

The ADuM3470 / ADuM3471/ADuM3472 / ADuM3473 / ADuM3474 devices are quad-channel, digital isolators with an integrated PWM controller and transformer driver for an isolated dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler^® technology, the dc-to-dc converter provides up to 2 W of regulated, isolated power at 3.3 V to 24 V from a 5.0 V input supply or from a 3.3 V supply. This eliminates the need for a separate, isolated dc-to-dc converter in 2 W 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-to-dc converter. The result is a small form factor, total isolation solution.

The ADuM347x isolators provide four independent isolation channels in a variety of channel configurations and data rates.

Applications

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

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