The integrated isolated DC-DC converter uses advanced circuit and on-chip layout techniques to reduce radiated emissions and achieve up to 46% typical efficiency. The integrated transformer uses thin film polymer as the insulation barrier. Output voltage of power converter can be controlled to 3.3 V or 5 V using V_SEL pin. The DC-DC converter can be switched off using the EN pin to save power. The output voltage, V_ISOOUT , is monitored and feedback information is conveyed to the primary side through a dedicated isolation channel. V_ISOOUT needs to be connected to V_ISOIN to ensure the feedback channel is properly powered to regulate the DC-DC converter. This can be achieved by connecting the pins directly or through an LDO that remains powered up at all times. A ferrite bead is recommended between V_ISOOUT and V_ISOIN to further reduce emissions. See the Section 10.2 section. The duty cycle of the primary switching stage is adjusted accordingly. The fast feedback control loop of the power converter ensures low overshoots and undershoots during load transients. Undervoltage lockout (UVLO) with hysteresis is integrated on the V_IO, V_DD and V_ISOIN supplies which ensures robust fails-safe system performance under noisy conditions. An integrated soft-start mechanism ensures controlled inrush current and avoids any overshoot on the output during power up.