ame5251 AME, Inc., ame5251 Datasheet - Page 10

• Manufacturer Part Number: ame5251
• Description: Dual 1a, 1.5mhz Synchronous Step-down Converter
• Manufacturer: AME, Inc.

PC Board Layout Checklist
AME5251. Check the following in your layout:
10
AME5251
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
V
the (+) plate of C
power MOSFETs.
C
IN
IN
2.5 to 5.5V
4.7 F
CER
C
IN
V
IN
Figure 9: 1.6V Step-Down Regulator
AME
FB
EN
NC
IN
IN
EN
pin connect directly to the feedback resistors? The resistive divider R2/R1 must be connected between
AME5251
AME5251
GND
OUT
and ground.
GND
SW
FB
IN
SW
FB
and C
22pF
OUT
L1
2.2 H
150K
90K
C1
as close as possible.
IN
as closely as possible? This capacitor provides the AC current to the internal
V
OUT
R1
R2
1.6V
10 F
C
CER
OUT
V
C
OUT
OUT
FB
node.
Dual 1A, 1.5MHz Synchronous
3.6 to 5.5V
4.7 F
CER
C
IN
V
V
C
IN
IN
IN
Figure 10: 3.3V Step-Down Regulator
IN
trace should be kept short, direct and wide.
IN
EN
AME5251
Step-Down Converter
GND
EN
NC
IN
AME5251
SW
FB
GND
OUT
SW
22pF
2.2 H
33.3K
150K
L1
V
C
OUT
OUT
3.3V
Rev. A.02
10 F
C
CER
OUT
V
OUT