ADP1660ACBZ-R7 datasheet(25/28 Pages) AD

25 / 28 page

Data Sheet

ADP1660

Rev. 0 | Page 25 of 28

PCB LAYOUT

Poor layout can affect performance, causing electromagnetic

interference (EMI) and electromagnetic compatibility (EMC)

problems, ground bounce, and power losses. Poor layout can also

affect regulation and stability. Figure 32 shows an optimized

layout implemented using the following guidelines:

•

Place the inductor, input capacitor, and output capacitor

close to the IC using short tracks. These components carry

high switching frequencies and large currents.

•

Use as wide a trace as possible between the inductor and

the SW pin. The easiest path for this trace is through the

center of the output capacitor.

•

Route the LED1/LED2 path away from the inductor and

SW node to minimize noise and magnetic interference.

•

Maximize the size of ground metal on the component side

of the board to help with thermal dissipation.

•

Use a ground plane with two or three vias connecting to

the component side ground near the output capacitor to

reduce noise interference on sensitive circuit nodes.

Analog Devices applications engineers can be contacted

through the Analog Devices sales team to discuss different

layouts based on system design constraints.

LED2

DIGITAL

INPUT/

OUTPUT

PGND

LED1

AREA = 16.4mm2

Li-ION+

INDUCTOR

Figure 32. Layout of the ADP1660 Driving a High Power White LED

ADP1660ACBZ-R7 Datasheet(PDF) 25 Page - Analog Devices