Isolated Switch Regulator with Integrated Feedback

The ADuM40701 is a regulated dc-to-dc isolated power supply controller with an internal MOSFET driver. The dc-to-dc controller has internal isolated PWM feedback from the secondary side based on the iCoupler® chip scale transformer technology and complete loop compensation. This architecture eliminates the need to use an optocoupler for feedback and compensates the loop for stability.

The ADuM4070 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 solution with a smaller form factor and 8.3 mm creepage distance.

The regulated feedback provides a relatively flat efficiency curve over the full output power range. The ADuM4070 enables a dc-todc 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..

Applications

* Power supply startup bias and gate drives

* Isolated sensor interfaces

* Process controls

* 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 70% efficiency

* 200 kHz to 1 MHz adjustable oscillator

* Soft start function at power-up

* Pulse-by-pulse overcurrent protection

* Thermal shutdown

* 5000 V rms isolation

* High common-mode transient immunity: >25 kV/µs