ame5250 AME, Inc., ame5250 Datasheet - Page 10

• Manufacturer Part Number: ame5250
• Description: 1a, 1.5mhz Synchronous Step-down Converter
• Manufacturer: AME, Inc.

PC Board Layout Checklist
AME5250. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout:
10
AME5250
2.5V to 5.5V
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the
1. The power traces, consisting of the GND trace, the SW trace and the V
2. Does the V
3. Does the (+) plate of CIN connect to V
4. Keep the switching node, SW, away from the sensitive V
5. Keep the (-) plates of C
4.7µF
CER
C
the (+) plate of C
power MOSFETs.
V
OUT
V
C
IN
IN
IN
NC
EN
V
C
between V
GND as closer as
possible
IN
C
IN
Figure 10: AME5250 Adjustable Voltage
IN
must be placed
1
2
3
Figure 8: 1.6V Step-Down Regulator
AME
IN
EN
AME5250
DD
FB
EN
NC
IN
and
Regulator Layout Diagram
pin connect directly to the feedback resistors? The resistive divider R2/R1 must be connected between
AME5250
AME5250
GND
OUT
6
5
4
and ground.
GND
SW
GND
FB
FB
SW
SW should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
IN
SW
FB
and C
L1
C1
OUT
90K
2.2µH
L1
150K
as close as possible.
22pF
IN
as closely as possible? This capacitor provides the AC current to the internal
R1
R2
C
OUT
Output capacitor
must be near
AME5250
C1
V
C
OUT
V
1.6V
OUT
OUT
CER
C
10µF
OUT
R1
R2
FB
3.6V to 5.5V
node.
4.7µF
CER
C
V
C
OUT
IN
V
IN
IN
EN
NC
V
IN
C
Figure 11: AME5250 Fixed Voltage
IN
1
2
3
Figure 9: 3.3V Step-Down Regulator
IN
1A, 1.5MHz Synchronous
C
between V
GND as closer as
possible
IN
Regulator Layout Diagram
trace should be kept short, direct and wide.
AME5250
must be placed
EN
NC
IN
IN
EN
AME5250
Step-Down Converter
DD
AME5250
and
GND
6
5
4
GND
OUT
SW
V
GND
SW
OUT
SW
FB
SW should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
L1
33.3K
C
OUT
L1
2.2µH
150K
22pF
V
OUT
C
Rev. A.02
OUT
Output capacitor
must be near
AME5250
V
3.3V
OUT
CER
10µF
C
OUT