ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474 are four-channel digital isolators that integrate a PWM controller and a transformer driver for driving isolated DC/DC converters. The DC/DC converter is based on Analog Devices’ iCoupler® technology and provides a regulated isolated power supply of 2 W, 3.3 V to 24 V, with an input supply voltage of 5.0 V or 3.3 V. This eliminates the need for a separate isolated DC/DC converter in 2 W isolated designs. iCoupler chip-scale transformer technology is used for isolation of logic signals; the integrated transformer driver with isolated secondary control enhances the efficiency of the isolated DC/DC converter, thus providing a small-sized, fully isolated solution. ADuM347x isolators provide four independent isolation channels supporting a variety of channel configurations and data rates.
The ADuM347x family (ADuM3470‑ADuM3474) are four‑channel digital isolators that integrate a PWM controller and a transformer driver to power isolated DC‑DC converters. They use Analog Devices’ iCoupler® chip‑level transformer technology and provide adjustable isolated output voltages from 3.3 V to 24 V.
Key features include 2 W output power, selectable AR (1 Mbps) or CR (25 Mbps) data rates, 2500 V rms isolation, a -40 °C to +105 °C operating range, and soft‑start with over‑current protection. Typical applications are industrial field‑bus isolation, gate‑drive for power converters, and isolated sensor interfaces.
| Isolation voltage | 2500 V rms |
|---|---|
| Isolated output voltage VISO (5 V version) | 4.5 V – 5.5 V (typ 5.0 V) |
| Switching frequency fSW | 500 kHz |
| Logic high input threshold VIH | 2.0 V (typ) |
| Maximum data rate (CR version) | 25 Mbps |
| Operating temperature range | -40 °C to +105 °C |
The AR version supports up to 1 Mbps, while the CR version supports up to 25 Mbps.
They are rated for 2500 V rms isolation between primary and secondary sides.
They operate from –40 °C up to +105 °C.
The PWM controller runs at a typical frequency of 500 kHz.