MIC5264 Ver la hoja de datos (PDF) - Micrel

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MIC5264

150mA µCap Dual LDO Regulator

Micrel 

Micrel, Inc.

MIC5264 Junction-To-Ambient Thermal Resistance

Package

θJA Recommended

Minimum Footprint

θJC

2.5mm x 2.5mm

MLF-10

75°C/W

Thermal Resistance

2°C/W

Substituting PD for PD(max) and solving for the ambient

operating temperature will give the maximum operating

conditions for the regulator circuit. The junction-to-

ambient thermal resistance for the minimum footprint is

63°C/W. The maximum power dissipation must not be

exceeded for proper operation.

For example, when operating the MIC5264PMYML at an

input voltage of 5.0V at 150mA on VOUT1 and 100mA on

VOUT2 with a minimum footprint layout, the maximum

ambient operating temperature TA can be determined as

follows:

MIC5264

0.52W

=

⎜⎜⎝⎛

125°C −

63°C

TA

⎟⎟⎠⎞

TA = 92.24°C

Therefore, a 3.0V application at 150mA on Ch1 and 2.8V

at 100mA on Ch2 can accept an ambient operating

temperature of 92°C in a 10-pin 2.5mm x 2.5mm 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

information can be found on Micrel's website at:

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

May 2006

10

M9999-052406

(408) 955-1690

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