LM1108 HTC Korea TAEJIN Technology Co., LM1108 Datasheet - Page 4

• Manufacturer Part Number: LM1108
• Description: 300ma C-mos L.d.o. Regulator
• Manufacturer: HTC Korea TAEJIN Technology Co.

300mA C-MOS L.D.O. Regulator
LM1108F/SF
EQUATION 2-2:
Table 2-1 shows various values of θJA for the LM1108 versus board copper area.
TABLE 2-1 : THERMAL RESISTANCE GUIDELINES FOR LM1108
Equation 2-1can be used in conjunction with Equation 2-2 to ensure regulator thermal operation is within limits.
Forexample:
In this example, the LM1108 dissipates a maximum of 260mW; below the allow able limit of 508 mW . In a similar
manner, Equation 2-1 and Equation 2-2 can be used to calculate maximum current and/or input voltage limits. For
example, the maximum allowable VIN, is found by sustituting the maximum allowable power dissipation of 508
mW into Equation 2-1, from which VINMAX = 4.6V.
HTC
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