As depicted in Figure 10-1 and Figure 10-2, place the input and output capacitors close to the device for the layout of the TPS7B87-Q1. In order to enhance the thermal performance, place as many vias as possible around the device. These vias improve the heat transfer between the different GND planes in the PCB.

To improve AC performance such as PSRR, output noise, and transient response, TI recommends a board design with separate ground planes for V_IN and V_OUT, with each ground plane connected only at the GND pin of the device. In addition, the ground connection for the output capacitor must connect directly to the GND pin of the device.

Minimize equivalent series inductance (ESL) and ESR in order to maximize performance and ensure stability. Place each capacitor as close as possible to the device and on the same side of the PCB as the regulator itself.

Do not place any of the capacitors on the opposite side of the PCB from where the regulator is installed. TI strongly discourages the use of vias and long traces to connect the capacitors because may negatively affect system performance and even cause instability.

If possible, and to ensure the maximum performance specified in this document, use the same layout pattern used for the TPS7B87-Q1 evaluation board, available at www.ti.com.