150 mA C-MOS L.D.O. Regulator
EQUATION 3-1:
LM1185SF
The maximum allowable power dissipation (Equation
3-2) is a function of the maximum ambient
temperature(T
AMAX
), the maximum allowable die
temperature(T
JMAX
) and the thermal resistance from
junction-to-air(θ
JA
).
EQUATION 3-2:
Equation 3-1 can be used in conjunction with
Equation 4-2 to ensure regulator thermal operation
is within limits.Forexample:
3.3 Layout Considerations :
The primary path of heat conduction out of the package is via the package leads. Therefore,layouts
having a ground plane,wide traces at the pads,and wide power supply bus lines combine to lower
θ
and therefore increase the maximum allow able power dissipation limit.
JA
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