LP3893ES-1.5/NOPB National Semiconductor, LP3893ES-1.5/NOPB Datasheet - Page 9

• Manufacturer Part Number: LP3893ES-1.5/NOPB
• Description: IC REG LDO 3.0A 1.5V TO-263-5
• Manufacturer: National Semiconductor

Specifications of LP3893ES-1.5/NOPB

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.5V
• Voltage - Input: Up to 5.5V
• Voltage - Dropout (typical): 0.27V @ 3A
• Number Of Regulators: 1
• Current - Output: 3A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-5, D²Pak (5 leads + Tab), TO-263BA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: *LP3893ES-1.5; *LP3893ES-1.5/NOPB; LP3893ES-1.5

Application Hints
HEATSINKING TO-263 PACKAGE
The TO-263 package uses the copper plane on the PCB as
a heatsink. The tab of these packages are soldered to the
copper plane for heat sinking. The graph below shows a
curve for the θ
sizes, using a typical PCB with 1 ounce copper and no solder
mask over the copper area for heat sinking.
FIGURE 1. θ
JA
JA
of TO-263 package for different copper area
vs Copper (1 Ounce) Area for TO-263
package
(Continued)
20069725
9
As shown in the graph below, increasing the copper area
beyond 1 square inch produces very little improvement. The
minimum value for θ
PCB is 32˚C/W.
Figure 2 shows the maximum allowable power dissipation
for TO-263 packages for different ambient temperatures,
assuming θ
ture is 125˚C.
FIGURE 2. Maximum power dissipation vs ambient
JA
temperature for TO-263 package
is 35˚C/W and the maximum junction tempera-
JA
for the TO-263 package mounted to a
20069726
www.national.com