GENERAL DESCRIPTION

The ADuM3470/ADuM3471/ADuM3472/ADuM3473/ ADuM3474 devices1 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 (see the Ordering Guide).

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 recognition: 2500 V rms for 1 minute per UL 1577

CSA Component Acceptance Notice #5A

VDE certificate of conformity

DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

VIORM = 560 V peak

Qualified for automotive applications

APPLICATIONS

RS-232/RS-422/RS-485 transceivers

Industrial field bus isolation

Power supply start-up bias and gate drives

Isolated sensor interfaces

Process controls

Automotive