LP3964EMP-5.0/NOPB National Semiconductor, LP3964EMP-5.0/NOPB Datasheet - Page 16
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LP3964EMP-5.0/NOPB
Manufacturer Part Number
LP3964EMP-5.0/NOPB
Description
IC REGULATOR ULTR LDO SOT223-5
Manufacturer
National Semiconductor
Datasheet
1.LP3961EMP-1.8NOPB.pdf
(22 pages)
Specifications of LP3964EMP-5.0/NOPB
Regulator Topology
Positive Fixed
Voltage - Output
5V
Voltage - Input
Up to 7V
Voltage - Dropout (typical)
0.24V @ 800mA
Number Of Regulators
1
Current - Output
800mA
Current - Limit (min)
1.2A
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-223 (4 leads + Tab)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LP3964EMP-5.0
LP3964EMP-5.0TR
LP3964EMP-5.0TR
www.national.com
Application Hints
HEATSINKING TO-263 AND SOT-223 PACKAGES
The TO-263 and SOT223 packages use the copper plane on
the PCB as a heatsink. The tab of these packages are
soldered to the copper plane for heat sinking. Figure 3
shows a curve for the θ
copper area sizes, using a typical PCB with 1 ounce copper
and no solder mask over the copper area for heat sinking.
As shown in the figure, increasing the copper area beyond 1
square inch produces very little improvement. The minimum
value for θ
32˚C/W.
Figure 4 shows the maximum allowable power dissipation
for TO-263 packages for different ambient temperatures,
assuming θ
ture is 125˚C.
Figure 5 shows a curve for the θ
different copper area sizes, using a typical PCB with 1 ounce
copper and no solder mask over the copper area for heat
sinking.
FIGURE 3. θ
FIGURE 4. Maximum power dissipation vs ambient
JA
JA
temperature for TO-263 package
for the TO-263 packag mounted to a PCB is
is 35˚C/W and the maximum junction tempera-
JA
vs Copper(1 Ounce) Area for TO-263
JA
package
of TO-263 package for different
(Continued)
JA
of SOT-223 package for
10112932
10112933
16
The following figures show different layout scenarios for
SOT-223 package.
FIGURE 5. θ
FIGURE 6. SCENARIO A, θ
FIGURE 7. SCENARIO B, θ
JA
vs Copper(1 Ounce) Area for SOT-223
package
JA
JA
= 148˚C/W
= 125˚C/W
10112919
10112921
10112920