MIC5301-1.3YMT datasheet(9/11 Pages) MICREL

Part #	MIC5301-1.3YMT

Description	Single, 150mA 關Cap ULDO

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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9 / 11 page

Micrel, Inc.

MIC5301

April 2008

9

M9999-042108

To determine the maximum ambient operating

temperature of the package, use the junction-to-

ambient thermal resistance of the device and the

following basic equation:

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 MIC5301 in the 6-pin 1.6mm x

1.6mm MLF

® package.

Package

θJA Recommended

Minimum Footprint

6-Pin 1.6x1.6 MLF

®

100°C/W

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 MIC5301-2.8YML at

an input voltage of 5V and 150mA load with a

minimum footprint layout, the maximum ambient

operating temperature TA can be determined as

follows:

0.33W = (125°C – TA)/(100°C/W)

TA=92°C

Therefore, a 2.8V application with 150mA of output

current can accept an ambient operating temperature

of 92°C in a 1.6mm x 1.6mm 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

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MIC5301-1.3YMT Datasheet(PDF) 9 Page - Micrel Semiconductor

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