MIC5321 查看數據表（PDF） - Micrel

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MIC5321

Dual, High Performance 150mA µCap ULDO™

Micrel 

Micrel, Inc.

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 100°C/W.

The maximum power dissipation must not be

exceeded for proper operation.

For example, when operating the MIC5321-MFYMT at

an input voltage of 3.3V and 150mA loads at each

output with a minimum footprint layout, the maximum

ambient operating temperature TA can be determined

as follows:

MIC5321

0.345W = (125°C – TA)/(100°C/W)

TA=90.5°C

Therefore, a 2.8V/1.5V application with 150mA at

each output current can accept an ambient operating

temperature of 90.5°C in a 1.6mm x 1.6mm Thin

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 2008

10

M9999-051508-E

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