SNVSBK2 September 2019 LP8733
The performance of the LP8733xx device depends greatly on the care taken in designing the printed circuit board (PCB). The use of low-inductance and low serial-resistance ceramic capacitors is strongly recommended, while proper grounding is crucial. Attention must be given to decoupling the power supplies. Decoupling capacitors must be connected close to the device and between the power and ground pins to support high peak currents being drawn from system power rail during turnon of the switching MOSFETs. Keep input and output traces as short as possible, because trace inductance, resistance, and capacitance can become performance limiting items. The separate buck regulator power pins VIN_Bx are not connected together internally. Connect the VIN_Bx power connections together outside the package using power plane construction.