RT8283A Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
componentes Descripción
Fabricante
RT8283A Datasheet PDF : 15 Pages
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RT8283A
(d) Copper Area = 50mm2 , θJA = 51°C/W
(e) Copper Area = 70mm2 , θJA = 49°C/W
Figure 6. Themal Resistance vs. Copper Area Layout
Design
Layout Consideration
Follow the PCB layout guidelines for optimal performance
of the RT8283A.
` Keep the traces of the main current paths as short and
wide as possible.
` 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 at small area. Keep analog components away
from the 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 RT8283A.
` Connect all analog grounds to a command node and
then connect the command node to the power ground
behind the output capacitors.
` An example of PCB layout guide is shown in Figure 6 for
reference.
GND
VIN SW GND
Input capacitor must
be placed as close
to the IC as possible.
VOUT
CIN
L1
CS*
BOOT
VIN
SW
GND
8
2
7
GND
3
6
9
4
5
VIN The feedback components
must be connected as close
CS
REN to the device as possible.
CC
SS
EN
CP RC
COMP
R1
FB
RS*
COUT
R2 VOUT
SW should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace.
GND
Figure 8. PCB Layout Guide
DS8283A-01 March 2011
www.richtek.com
13
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