October 2004

9

M9999-100604

MIC5319

Micrel

Table 1 shows junction-to-ambient thermal resistance for the

MIC5319 in the 2mm x 2mm MLF package.

Package

θ

θθ

θ

θ

θθ

θ

Minimum Footprint

2 x 2 MLF™

93°C/W

2°C/W

SOT-23-5

235°C/W

Table 1. Thermal Resistance

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.

0.25W

125 C

T

93 C/W

T

101.75 C

A

A

=

° −

°

=°

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

tion can be found on Micrel's website at:

http://www.micrel.com/_PDF/other/LDOBk_ds.pdf