As this slide shows on the left, the efficiency of the ADuM347x based solution stays relatively flat at greater than 70% for loads down to about 10% of the maximum output current for a 5V to 5V design. This flat efficiency curve is a result of the built-in PWM feedback that is achieved with the iCoupler technology. This kind of flat efficiency response can not be achieved with an open loop design using a simple switching topology. The PWM feedback also ensures a DC load regulation of about 0.1% for 0 to 500mA as shown on the right.