MIC5355 Datasheet, PDF(10/18 Page) Micrel Semiconductor – Dual 500mA μCap Low Dropout, Micropower Linear Regulator

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MIC5355 Datasheet, PDF (10/18 Pages) Micrel Semiconductor – Dual 500mA μCap Low Dropout, Micropower Linear Regulator

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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 64.4Â°C/W.

The maximum power dissipation must not be

exceeded for proper operation.

For example, when operating a 2.5V/1.8V application

with an input voltage of 3.0V and 500mA at each

output with a minimum footprint layout, the maximum

ambient operating temperature TA can be determined

as follows:

0.85W = (125Â°C â TA)/(64.4Â°C/W)

TA = 70.3Â°C

Therefore, a MIC5355-JGYMME application with

500mA at each output current can accept an ambient

operating temperature of 70.3Â°C in a small 8-pin ePad

MSOP package. For a full discussion of heat sinking

and thermal effects on voltage regulators refer to the

âRegulator Thermalsâ section of Micrelâs 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

MIC5355/6

March 2012

M9999-031512-A

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