DA9155M

2.5 A Companion Charger for rapid charging

12 Application information

12.1 PCB layout

EN

nIRQ

SDA

SCL

NC0

AGND

AGND

TP

NC1

AGND

AGND

VDDIO

AGND

AGND

AGND

VBAT

PGND

VLX

VLX

VLX

BOOT

PVDD

AVDD

VBATN

VIN

PGND

VLX

VLX

VLX

VIN

1005

1005

Power ground

Power ground

Quiet ground

112

112

112

112

112

112

112

112

112

Figure 21: Preliminary PCB layout for DA9155M (component sizes in mm)

It is recommended to create a separate quiet ground for the AVDD capacitor connection. The PCB

layout should ensure this ground is kept quiet, for example, they should be separated from the main

noisy power ground return path. The quiet ground can then be connected to the main ground at the

ground plane.

12.2 Component selection

12.2.1

Capacitors

Ref

Value

Size code

[mm]

Temp.

Char.

Tol.

Rating

Part

Buck input

bypass

10 µF

1608

X5R

±20%

25 V

CL10A106MA8NRNC

10 µF

1608

X5R

±20%

25 V

Murata GRM188R61E106MA73

Buck output

bypass

22 µF

1608

X5R

±20%

6.3 V

Murata GRM188R60J226MEA0

10 µF

1608

X5R

±20%

6.3 V

GRM188R60J106ME84

Datasheet

v3.05

22-July-2016

CFR0011-120-00 Rev 5

34 of 36

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