MIC5319 Datasheet, PDF (9/10 Pages) Micrel Semiconductor – 500mA uCap Ultra-Low Dropout, High PSRR LDO Regulator

MIC5319
Micrel
Table 1 shows junction-to-ambient thermal resistance for the
MIC5319 in the 2mm x 2mm MLF package.
0.25W = ^{125°C − TA}
93°C/W
Package
θ_JA Recommended
Minimum Footprint
2 x 2 MLF™
93°C/W
SOT-23-5
235°C/W
Table 1. Thermal Resistance
θ_JC
2°C/W
Substituting 0.25W for P_D(max) and solving for the ambient
operating temperature will give the maximum operating con-
ditions for the regulator circuit. The maximum power dissipa-
tion must not be exceeded for proper operation.
T_A = 101.75°C
Therefore, a 2.8V application at 500mA of output current can
accept an ambient operating temperature of 101.75°C in a
2mm x 2mm MLF package. For a full discussion of heat
sinking and thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook. This informa-
tion can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
October 2004
9
M9999-100604