NPM1100-CAAA-R datasheet(48/58 Pages) NORDIC

48 / 58 page

Hardware and layout

Designator

Value

Description

Footprint

2.2 µF

Capacitor, X5R, 25 V,

±20%

0603

C2, C3, C4

10 µF

Capacitor, X5R, 6.3 V,

±20%

0603

Battery pack

Battery pack with NTC

TP_3x1mm_TH

2.2 µH

Inductor ±20%

0806

LD1, LD3

L0603R

LED, SMD, 0603, RED

0603

LD2

L0603G

LED, SMD, 0603, GREEN 0603

1 K

Resistor, 0.05 W, ±1%

0201

R_ICHG

1K5

Resistor, 0.05 W, ±1%

0201

nPM1100-CAAA

Li-ion/Li-poly USB

battery charger with

a high efficiency buck

regulator

WLCSP-25

Table 25: Configuration 3 reference circuitry

8.3.4 PCB guidelines

A well designed PCB is necessary to achieve good performance. A poor layout can lead to loss in

performance or functionality.

To ensure functionality, it is essential to follow the schematics and layout references closely.

A PCB with a minimum of two layers, including a ground plane, is recommended for optimal performance.

The DC supply voltage should be decoupled with high performance capacitors as close as possible to the

supply pins. See the reference schematics Schematic nPM1100 WLCSP25 for recommended decoupling

capacitor values.

Long power supply lines on the PCB should be avoided. All device grounds, VDD connections, and VDD

bypass capacitors must be connected as close as possible to the device.

8.3.5 PCB layout example

The PCB layout shown here is a reference layout for the WLCSP25 package.

For all available reference layouts, see the Reference Layout section on the Downloads tab for nPM1100

on www.nordicsemi.com.

4445_367 v1.0

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