ame5258 AME, Inc., ame5258 Datasheet - Page 11

• Manufacturer Part Number: ame5258
• Description: Synchronous Buck Converter
• Manufacturer: AME, Inc.

PC Board Layout Checklist
AME5258. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout:
AME5258
Rev.A.05
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
3.3V to 5.5V
4.7 F
CER
C
the (+) plate of C
power MOSFETs.
OUT
V
IN
C
IN
V
Figure 8: 3V Step-Down Regulator
Figure 10: AME5258 Adjustable Voltage
IN
+
-
AME
IN
EN
FB
IN
EN
pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between
Regulator Layout Diagram
AME5258
AME5258
GND
GND
OUT
and ground.
SW
IN
FB
SW
FB
and C
OUT
R1
240K
C
FWD
L1
R2
2.2 H
as close as possible.
960K
22pF
IN
as closely as possible? This capacitor provides the AC current to the internal
V
+
-
OUT
C
V
OUT
OUT
3V
CER
C
10 F
OUT
FB
3.6V to 5.5V
node.
4.7 F
CER
C
Synchronous Buck Converter
OUT
C
V
IN
IN
V
IN
Figure 11: AME5258 Fixed Voltage
Figure 9: 3.3V Step-Down Regulator
+
-
IN
Regulator Layout Diagram
trace should be kept short, direct and wide.
IN
EN
IN
EN
AME5258
GND
AME5258
GND
V
SW
OUT
SW
FB
1.5MHz, 600mA
L1
196K
2.2 H
887K
22pF
V
OUT
+
-
C
OUT
V
3.3V
OUT
CER
C
10 F
OUT
11