The VCC pin supplies all analog and digital circuits internal to the device. Connect a 3.3-V supply voltage, and local ceramic bypass capacitor with a minimum effective capacitance of 1.0 µF.

The VREF pin is the output of an internal LDO with a nominal voltage of 1.5 V. The VREF voltage provides a common-mode voltage for the power stage IOUT pins, as well as internal analog circuits. Bypass the VREF pin local to the controller, with a ceramic bypass capacitor with a minimum effective capacitance of 1.0 µF. Connect VREF to the REFIN pins of the power stages.