AME5253 Datasheet, PDF (10/18 Pages) Analog Microelectronics – 1A, 1.5MHz Synchronous Step-Down Converter

AME
AME5253
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
AME5253. These items are also illustrated graphically in Figures 9. 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
IN
L1
SW
V_OUT
AME5253
CFWD
C_OUT
EN
FB
GND
R2
CIN
R1
CFWD: 22pF~220 pF
Figure 9: AME5253 Adjustable Voltage
Regulator Layout Diagram
10
Rev. A.04