Isolated Switch Regulator with Quad-Channel Isolators (3/1 Channel Directionality)

The ADuM4470 / ADuM4471 / ADuM4472 / ADuM4473 / ADuM4474 are quad-channel, digital isolations with a regulated DC/DC isolated power supply controller with an internal MOSFET driver. The DC/DC controller has an internal isolated PWM feedback from the secondary side based on the iCoupler® chip scale transformer technology and complete loop compensation. This eliminates the need to use an optocoupler for feedback and compensates the loop for stability.

The ADuM447x isolator provides a more stable output voltage and higher efficiency compared to unregulated isolated dc-to-dc power supplies. The fully integrated feedback and loop compensation in a wide-body SOIC package provide a smaller form factor and 8.3 mm creepage distance solution.

The regulated feedback provides a relatively flat efficiency curve over the full output power range. The ADuM3070 enables a DC/DC converter with a 3.3 V to 24 V isolated output voltage range from either a 5.0 V or a 3.3 V input voltage, with an output power of up to 2.5 W.

The ADuM447x isolators provide four independent isolation channels in a variety of channel configurations and data rates. (The x in ADuM447x throughout this data sheet stands for the ADuM4470 / ADuM4471 / ADuM4472 / ADuM4473 / ADuM4474).

APPLICATIONS

* Power supply startup bias and gate drives

* Isolated sensor interfaces

* Process controls

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

* Isolated PWM feedback with built-in compensation

* Primary side transformer driver for up to 2.5 W output power with 5 V input voltage

* Regulated adjustable output: 3.3 V to 24 V

* Up to 80% efficiency

* Quad DC-to-25 Mbps (NRZ) signal isolation channels

* 200 kHz to 1 MHz adjustable oscillator

* Soft start function at power-up

* Pulse-by-pulse overcurrent protection

* Thermal shutdown

* 5000 V rms isolation