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AME5259A Datasheet, PDF (12/21 Pages) Analog Microelectronics – 1.2A, 1.5MHz Synchronous Step-Down Converter
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AME
AME5259A
1.2A, 1.5MHz Synchronous
Step-Down Converter
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 VIN trace should be kept short, direct and wide.
2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R2/R1 must be connected between
the (+) plate of COUT and ground.
3. Does the (+) plate of CIN connect to VIN 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 VFB node.
5. Keep the (-) plates of CIN and COUT as close as possible.
VIN
L1
IN
SW
VOUT
CIN
AME5259A
EN
FB
C1
R1
COUT
R2
NC
GND
VIN
L1
VOUT
IN
SW
CIN
A ME5259 A
EN
OUT
COUT
NC
GND
NC 1
AME5259A
6
VOUT
EN 2
VIN
3
5 GND
4 SW
Output capacitor
L1
must be near
AME 5259 A
C OU T
CIN
CIN must be placed
between VDD and
GND as closer as
possible
SW should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
Figure 10. AME5259A Adjustable Voltage
Regulator Layout Diagram
AME5259A
NC 1
6 FB
EN 2
5 GND
Output capacitor
must be near
L1
AME 5259 A
VIN 3
4 SW
R1
COUT C1
CIN
SW should be connected
R2
to Inductor by wide and
CIN must be placed
between VDD and
GND as closer as
short trace, keep
sensitive components
away from this trace
possible
Figure 11. AME5259A Fixed Voltage
Regulator Layout Diagram
12
Rev. A.02
 ▷