SLVS658C March 2006 – January 2016 TPS65811
PRODUCTION DATA.
The PCB layout for a switching power supply is an important step of the design, especially for high peak current and high switching frequency converters. To avoid stability and EMI problems, TI recommends that short and wide traces be used for the main current path and for the power ground tracks. The input capacitor, output capacitor and the inductor must be placed as close as possible to the IC. Use a common ground node for power ground and a different one for analog ground to minimize the effects of ground noise. Both these ground nodes must be connected together at a point close to one of the IC ground pins.
The PGNDx pins are the ground connections for the power stage and therefore carry high DC and AC peak currents. A low impedance connection between the PGNDx pins and the power ground plane is recommended. No other pins must be connected to the PGNDx pins.
The AGNDx pins serve as the ground connections for the internal analog circuitry of the device. These pins must be connected directly to the PCB ground plane using vias.