Datasheet

TAB
IS
GND
OUT
GND
EN
1
2
3
4
5
IN
LP38513S-1.8
ERROR
Power Dissipation www.ti.com
6 Power Dissipation
The TO-263 package alone has a junction to ambient thermal resistance (θ
JA
) rating of 60°C/W. When
mounted on the LP38513S evaluation board the θ
JA
rating is approximately 30°C/W.
Although there is only approximately 0.28 square inches of 1 ounce copper area immediately under the
tab, the top copper surface area is extended to an additional copper area, 1 square inch of 1 ounce
copper, on the bottom of the board by the use of nine thermal vias.
With the 30°C/W thermal rating the LP38513S-1.8 evaluation board will deliver the rated 3A output current
if V
IN
= 2.5V, V
OUT
= 1.8V, and T
A
≤ 25°C.
Figure 5. Maximum Power Dissipation vs. Ambient Temperature
7 Connection Diagram
4
AN-1518 LP38513S-1.8 Evaluation Board SNVA182A–August 2007–Revised April 2013
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