LP38851 datasheet(18/29 Pages) TI

Part #	LP38851

Description	LP38851 800 mA Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

PDF	29 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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18 / 29 page

LP38851

SNVS492C – JUNE 2007 – REVISED APRIL 2013

www.ti.com

Heat-Sinking The SO PowerPad Package

The LP38851MR 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 34.

θJA vs Copper (1 Ounce) Area for the SO PowerPad 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 34 shows that increasing the copper area beyond 1 square

inch produces very little improvement.

Figure 35. Maximum Power Dissipation vs Ambient Temperature for the SO PowerPad Package

Figure 35 shows the maximum allowable power dissipation for the SO PowerPad package for a range of ambient

temperatures, assuming

θJA is 98°C/W and the maximum junction temperature is 125°C.

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LP38851 Datasheet(PDF) 18 Page - Texas Instruments