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Layout Guidelines
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7 Layout Guidelines
The primary concerns when layout a custom receiver PCB are:
• AC1 and AC2 trace resistance
• OUT trace resistance
• RECT trace resistance
• GND connection
• Copper weight ≥ 2oz
For a 1A application the current rating for each net is as follows:
• AC1 = AC2 = 1.2 A
• BOOT1 = BOOT2 = 10 mA
• RECT = 1 A
• OUT = 1 A
• COM1 = COM2 = 300 mA
• CLAMP1 = CLAMP2 = 500 mA
• ILIM = 10 mA
• AD = AD_EN = TS-CTRL = EN1 = EN2 = TERM = FOD = 1 mA
• CHG = 10 mA
It is also recommended to have the following capacitance on RECT and OUT:
• RECT ≥ 10 μ F
• OUT ≥ 1 μ F
It is always good practice to place high frequency bypass capacitors next to RECT and OUT of 0.1 μ F. It
is also recommended to place vias directly underneath the QFN power-pad to optimize thermal flow to the
GND copper.
Figure 10 illustrates an example of a QFN layout:
Figure 10. QFN Layout
12 bq51013AEVM-765 Evaluation Module SLUU911 – June 2012
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