Isolated Switching Regulators (0/4 Channel Directionality)

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

* 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