ADP5053ACPZ-R7 datasheet(32/37 Pages) AD

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Data Sheet

ADP5053

Rev. B | Page 31 of 36

CIRCUIT BOARD LAYOUT RECOMMENDATIONS

Effective circuit board layout is essential to obtain the best

performance from the ADP5053 (see Figure 51). Poor layout

can affect the regulation and stability of the device, as well as

the electromagnetic interference (EMI) and electromagnetic

compatibility (EMC) performance. Refer to the following

guidelines for the most effective PCB layout.

•

Place the input capacitor, inductor, MOSFET, output

capacitor, and bootstrap capacitor near to the IC.

•

Use short, thick traces to connect the input capacitors to

the PVINx pins, and use dedicated power ground to connect

the input and output capacitor grounds to minimize the

connection length.

•

Use several high current vias, if required, to connect

PVINx, PGNDx, and SWx to other power planes.

•

Use short, thick traces to connect the inductors to the

SWx pins and the output capacitors.

•

Ensure that the high currentloop traces are as short and wide

as possible. Figure 50 shows the high current path.

•

Maximize the amount of ground metal for the exposed pad,

and use as many vias as possible on the component side to

improve thermal dissipation.

•

Use a ground plane with several vias connected to the

component side ground to further reduce noise

interference on sensitive circuit nodes.

•

Place the decoupling capacitors near to the VREG and

VDD pins.

•

Place the frequency setting resistor near to the RT pin.

•

Place the feedback resistor divider near to the FBx pin. In

addition, keep the FBx traces away from the high current

traces and the switch node to avoid noise pickup.

•

Use 0402 or 0603 size resistors and capacitors to achieve

the smallest possible footprint solution on boards where

space is limited.

VIN

VOUT

PVINx

ENx

PGND

BSTx

SWx

ADP5053

DLx

FBx

Figure 50. Typical Circuit with High Current Traces Shown in Gray

ADP5053

DUAL MOSFET

VOUT4

VOUT3

VOUT2

VOUT1

Figure 51. Typical PCB Layout

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