PAM2309 Datasheet, PDF (12/16 Pages) Power Analog Micoelectronics – 1A Step-Down DC-DC Converter

PAM2309
1A Step-Down DC-DC Converter
PCB Layout Check List
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of
the PAM2309. These items are also illustrated graphically in Figure 1. 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 V_FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected
between the (+) plate of C_OUT 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 C_IN and C_OUT as close as possible.
Figure 1 :PAM2309 Suggested Layout
Power Analog Microelectronics,Inc
www.poweranalog.com
12
08/2009 Rev 1.1