AME5259A datasheet(12/21 Pages) AME

12 / 21 page

AME

1.2A, 1.5MHz Synchronous

Step-Down Converter

AME5259A

Rev.A.02

PC Board Layout Checklist

When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the

AME5259A. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your

layout:

1. The power traces, consisting of the GND trace, the SW trace and the V

IN trace should be kept short, direct and wide.

2. Does the V

FB pin connect directly to the feedback resistors? The resistive divider R2/R1 must be connected between

the (+) plate of C

OUT and ground.

3. Does the (+) plate of CIN connect to V

IN as closely as possible? This capacitor provides the AC current to the internal

power MOSFETs.

4. Keep the switching node, SW, away from the sensitive V

FB node.

5. Keep the (-) plates of C

IN and COUT as close as possible.

Figure 10. AME5259A Adjustable Voltage

Regulator Layout Diagram

Figure 11. AME5259A Fixed Voltage

Regulator Layout Diagram

COUT

AME5259A

VIN

CIN

GND

VOUT

COUT

AME5259A

VIN

CIN

OUT

GND

VOUT

VIN

GND

CIN must be placed

between VDD and

GND as closer as

possible

CIN

COUT

SW should be connected

to Inductor by wide and

short trace, keep

sensitive components

away from this trace

AME5259A

Output capacitor

must be near

AME5259A

Output capacitor

must be near

AME5259 A

VIN

VOUT

GND

CIN must be placed

between VDD and

GND as closer as

possible

CIN

COUT

SW should be connected

to Inductor by wide and

short trace, keep

sensitive components

away from this trace

AME5259A

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