Dual High-Efficiency PWM Step-Down DC-DC Coverter
PCB Layout Check List
When laying out the printed circuit board, the following checklist should be used to ensure proper
operation of the PAM2306. 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 FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be con-
nected 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 FB node.
5. Keep the (–) plates of C
IN
and C
OUT
as close as possible.
Top
Bottom
PAM2306
Figure 1 :PAM2306 Suggested Layout
Power Analog Microelectronics
,
Inc
www.poweranalog.com
07/2008 Rev 1.0
13
PAM [ POWER ANALOG MICOELECTRONICS ]
