ADUM3471

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Isolated Switching Regulators (3/1 Channel Directionality)

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Overview

  • 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
      • VISO = 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)
      • VIORM = 560 V peak
  • Qualified for automotive 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

ADUM3471
Isolated Switching Regulators (3/1 Channel Directionality)
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474 Functional Block Diagram
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Evaluation Kits

eval board
EVAL-ADUM3471

EVAL-ADUM3471: Evaluation Board for the ADUM3470/3471/3472/3473/3474

Features and Benefits

  • 2 independent ADuM347x circuits including 2.5 kVrms isolated dc-to-dc converters
  • Single supply 5 V in to 5 V out (regulated) Reconfigurable to 5 V in to 3.3 V out or 3.3 V in to 3.3 V out
  • Double supply 5 V in to 15 V out (regulated) and 7.5 V out (unregulated) Reconfigurable to 5 V in to 12 V out (regulated) and 6 V out (unregulated)
  • 4 isolated 25Mbps data channels per ADuM347x circuit
  • Footprints for Coilcraft and Halo transformer options
  • Multiple switching frequency options

Product Details

The EVAL-ADuM3471EBZ demonstrates two separate applications for the ADuM347x family of quad-channel digital isolators with integrated transformer drivers. It has two independent power supply circuits: a double supply and a single supply. The switching frequency can be set from 200 kHz to 1000 kHz. The board supports a variety of I/O configurations and multiple transformer options. It is equipped with two ADuM3471 isolators.

EVAL-ADUM3471
EVAL-ADUM3471: Evaluation Board for the ADUM3470/3471/3472/3473/3474
EVAL-ADUM3471_sm

Reference Designs

16-Bit, 250 kSPS, 8-Channel Data Acquisition System
CN0254 Circuits from the lab

16-Bit, 250 kSPS 8-Channel, Single Supply, Isolated Data Acquisition System

Features and Benefits

  • Precision conversion up to 8 channels
  • Digital and power galvanic isolation
  • Small board area
Functional Block Diagram
CN0321 Circuits from the lab

Fully Isolated, Single Channel Voltage and 4 mA to 20 mA Output with HART

Features and Benefits

  • Voltage and 4mA to 20mA output
  • Fully isolated
  • HART connectivity
CN0254
16-Bit, 250 kSPS 8-Channel, Single Supply, Isolated Data Acquisition System
16-Bit, 250 kSPS, 8-Channel Data Acquisition System
CN0321
Fully Isolated, Single Channel Voltage and 4 mA to 20 mA Output with HART
Functional Block Diagram

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