AME5250 Datasheet, PDF (11/21 Pages) Analog Microelectronics – 1A, 1.5MHz Synchronous Step-Down Converter

AME
AME5250
1A, 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
AME5250. 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 V_IN trace should be kept short, direct and wide.
2. Does the V_FB pin connect directly to the feedback resistors? The resistive divider R2/R1 must be connected between
the (+) plate of C_OUT and ground.
3. Does the (+) plate of CIN connect to V_IN 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 V_FB node.
5. Keep the (-) plates of C_IN and C_OUT as close as possible.
VIN
L1
IN
SW
V_OUT
VIN
L1
V_OUT
IN
SW
CIN
AME5250
EN
FB
C1
R1
COUT
CIN
AME5250
EN
OUT
C_OUT
C_OUT
R2
NC
GND
NC
GND
AME5250
NC 1
EN 2
VIN 3
CIN
CIN must be placed
between VDD and
GND as closer as
possible
6 FB
5 GND
Output capacitor
must be near
L1
AME5250
4 SW
R1
COUT C1
SW should be connected
R2
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
Figure 10. AME5250 Adjustable Voltage Regulator
Layout Diagram
NC 1
AME5250
6 VOUT
EN 2
VIN 3
5 GND
4 SW
Output capacitor
L1
must be near
AME5250
CIN
CIN must be placed
between VDD and
GND as closer as
possible
COUT
SW should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
Figure 11. AME5250 Fixed Voltage Regulator
Layout Diagram
Rev.B.04
11