AME5251 Datasheet, PDF (11/19 Pages) Analog Microelectronics – Dual 1A, 1.5MHz Synchronous Step-Down Converter

AME
AME5251
Dual 1A, 1.5MHz Synchronous
Step-Down Converter
PCB Board Layout Check List
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the
AME5251. 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
AME5251
C1
R1
AME5251
CIN
EN
FB
COUT
CIN
EN
OUT
C_OUT
R2
NC
GND
NC
GND
Figure 7
Figure 8
Rev.A.05
11