AME

10

Dual 1A, 1.5MHz Synchronous

Step-Down Converter

AME5251A

Rev.A.04

PC Board Layout Checklist

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

AME5251A. Check the following in your layout:

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

2. Does the V

the (+) plate of C

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

power MOSFETs.

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

5. Keep the (-) plates of C

Figure 7: AME5251A Adjustable Voltage Regulator Layout Diagram

2

3

12

11

10

SW2

GND

EN2

NC2

FB2

close as possible .

R11, R12, R21, R22 and C 11,

C21 must be kept close to the

IC s FB pin to prevent noise

injection on the FB pin trace and

keeping far away from SW

node.

AME5251A

VIN2

1

GND

9

8

7

GND

SW1

VIN1

FB1

NC1

EN1

4

5

6

The ground area must provide adequate heat

dissipating area to the thermal pad and using

multiple vias to help thermal dissipation .

NC 1, NC2 pin no

connect or connect

to GND.

R21

R22

C21

L1

L2

R12

R11

C11

SW1, SW2 should be connected to inductor by wide and short trace

.

Keep sensitive components away from this trace .

VOUT 1

VOUT1

VOUT2

VOUT2