RT7272A
Layout Considerations
For best performance of the RT7272A, the following layout
guidelines must be strictly followed.
` Input capacitor must be placed as close to the IC as
possible.
(a) Copper Area = (2.3 x 2.3) mm2,θJA = 75°C/W
` SW should be connected to inductor by wide and short
trace. Keep sensitive components away from this trace.
` The RL resistor, compensator and feedback components
must be connected as close to the device as possible.
(b) Copper Area = 10mm2,θJA = 64°C/W
(c) Copper Area = 30mm2 ,θJA = 54°C/W
(d) Copper Area = 50mm2 ,θJA = 51°C/W
(e) Copper Area = 70mm2 ,θJA = 49°C/W
Figure 6. Thermal Resistance vs. CopperArea Layout
Design
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DS7272A-01 January 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
