LP38853_14 datasheet(17/27 Pages) TI1

Part #	LP38853

Description	3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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17 / 27 page

LP38853

www.ti.com

SNVS335C – DECEMBER 2006 – REVISED SEPTEMBER 2011

Figure 34. Maximum Power Dissipation vs Ambient Temperature for the DDPAK Package

Figure 34 shows the maximum allowable power dissipation for DDPAK packages for different ambient

temperatures, assuming

θJA is 35°C/W and the maximum junction temperature is 125°C.

Heat-Sinking The SO PowerPAD-8 Package

The LP38853MR package has a

θJA rating of 168°C/W, and a θJC rating of 11°C/W. The θJA rating of 168°C/W

includes the device DAP soldered to an area of 0.008 square inches (0.09 in x 0.09 in) of 1 ounce copper, with

no airflow.

Figure 35.

θJA vs Copper (1 Ounce) Area for the SO PowerPAD-8 Package

Increasing the copper area soldered to the DAP to 1 square inch of 1 ounce copper, using a dog-bone type

layout, will improve the

θJA rating to 98°C/W. Figure 35 shows that increasing the copper area beyond 1 square

inch produces very little improvement.

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LP38853 Datasheet(PDF) 17 Page - Texas Instruments