RT8056 查看數據表（PDF） - Richtek Technology
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RT8056 Datasheet PDF : 11 Pages
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RT8056
Layout Consideration
Follow the PCB layout guidelines for optimal performance of RT8056.
` For the main current path, keep their traces short and wide.
` Put the input capacitor as close as possible to the device pins (VIN and GND).
` LX node is with high frequency voltage swing and should be kept small area. Keep analog components away from LX
node to prevent stray capacitive noise pick-up.
` Connect feedback network behind the output capacitors. Keep the loop area small. Place the feedback components
near the RT8056.
` Connect all analog grounds to a command node and then connect the command node to the power ground behind the
output capacitors.
Connect the FB pin directly to VOUT2
feedback resistors. The resistor
divider must be connected
R3
R4
between VOUT and GND
FB2 1
NC 2
VIN 3
CIN NC 4
FB1 5
The CIN between
VIN and GND must
be as close as
possible to the IC.
GND
R2
R1
VOUT1
The trace for L1 and L2
must be wide and short.
Keep sensitive
VOUT2 compontents away from
COUT2
this trace.
L2
10 LX2
9 EN2
8 GND
7 EN1
11 6 LX1
L1
COUT1
VOUT1
Figure 3. PCB Layout Guide
www.richtek.com
10
DS8056-02 April 2011
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