MIC5318-33YD5 datasheet(9/11 Pages) MICREL

Part #	MIC5318-33YD5

Description	High Performance 300mA uCap ULDO TM

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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9 / 11 page

Micrel, Inc.

MIC5318

January 2007

9

M9999-011207

PD(MAX) =

TJ(MAX) - TA

JA

⎝

⎛

TJ(max) = 125°C, the maximum junction temperature of

the die θJA thermal resistance = 100°C/W.

The table below shows junction-to-ambient thermal

resistance for the MIC5318 in the 6-pin 1.6mm x

1.6mm Thin MLF

® package.

Package

θJA Recommended

Minimum Footprint

6-Pin 1.6x1.6 Thin MLF

®

100°C/W

Thermal Resistance

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 MIC5318-2.8YMT at

an input voltage of 3.3V and 300mA load with a

minimum footprint layout, the maximum ambient

operating temperature TA can be determined as

follows:

0.15W = (125°C – TA)/(100°C/W)

TA = 110°C

Therefore, a 2.8V application with 300mA of output

current can accept an ambient operating temperature

of 110°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 informa-

tion can be found on Micrel's website at:

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

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