MIC5264 datasheet(10/11 Pages) MICREL

Part #	MIC5264

Description	150mA 關Cap Dual LDO Regulator

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel, Inc.

MIC5264

May 2006

10

M9999-052406

(408) 955-1690

MIC5264 Junction-To-Ambient Thermal Resistance

Package

θJA Recommended

Minimum Footprint

θJC

2.5mm x 2.5mm

MLF-10

75°C/W

2°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

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:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

°

−

°

=

C

T

C

W

A

63

125

52

.

0

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

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