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RT7247C Datasheet(PDF) 13 Page - Richtek Technology Corporation

Part # RT7247C
Description  2A, 18V, 800kHz Synchronous Step-Down Converter
PDF  15 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT7247C Datasheet(HTML) 13 Page - Richtek Technology Corporation

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RT7247C
13
DS7247C-02
September 2012
www.richtek.com
©
Copyright
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
(a) Copper Area = (2.3 x 2.3) mm2,
θJA = 75°C/W
(b) Copper Area = 10mm2,
θJA = 64°C/W
(c) Copper Area = 30mm
2 ,
θJA = 54°C/W
(d) Copper Area = 50mm2 ,
θJA = 51°C/W
(e) Copper Area = 70mm
2 ,
θJA = 49°C/W
Figure 6. Thermal Resistance vs. Copper Area Layout
Design
Layout Consideration
Follow the PCB layout guidelines for optimal performance
of the RT7247C.
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).
SW node is with high frequency voltage swing and
should be kept at small area. Keep analog components
away from the SW 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 RT7247C.
An example of PCB layout guide is shown in Figure 8
for reference.



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