SC1566 Datasheet, PDF (7/9 Pages) Semtech Corporation – Very Low Dropout 3.0 Amp Regulator With Enable

POWER MANAGEMENT
Applications Information (Cont.)
( ) _{( ) R = TH(J−A )(MAX )}
T_{J(MAX )} − T_{A (MAX )}
P_{D(MAX )}
= ^{150 − 85}
1.81
= 36°C / W
R _{TH(J−C)(MAX )} = 3°C / W and R _TH(C−S) = 0°C / W,
therefore R _{TH(S−A )(MAX )} = 33°C / W
Outline Drawing - T0-263-3
SC1566
This should be achievable for the TO-263 package using
pcb copper area to aid in conducting the heat away from
the device, such as a large (~2 squ. inch) pad connected
to the tab of the device. Internal ground/power planes
and air flow will also assist in removing heat. For higher
power dissipations it may be necessary to use a small
heatsink and the TO-220 package.
Minimum Land Pattern - TO-263-3
ã 2001 Semtech Corp.
7
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