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HA15

C-MOS L.D.O. Regulator

HTC Korea 

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(TAMAX), the maximum allowable die

temperature(TJMAX) and the thermal resistance from

junction-to-air(θJA).

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 JA

and therefore increase the maximum allow able power dissipation limit.

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