LM337IMP National Semiconductor, LM337IMP Datasheet - Page 5

• Manufacturer Part Number: LM337IMP
• Description: IC, NEG ADJ REG, -1.2V TO -37V, SOT223-3
• Manufacturer: National Semiconductor

Specifications of LM337IMP

• Primary Input Voltage: 40V
• Output Voltage Adjustable Range: -1.2V To -37V
• Dropout Voltage Vdo: 1.9V
• No. Of Outputs: 1
• No. Of Pins: 3
• Output Current: 1A
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Connection Diagrams
Application Hints
When a value for θ
a heatsink must be selected that has a value that is less than
or equal to this number.
HEATSINKING SOT-223 PACKAGE PARTS
The SOT-223 (“MP”) packages use a copper plane on the
PCB and the PCB itself as a heatsink. To optimize the heat
sinking ability of the plane and PCB, solder the tab of the
package to the plane.
Figures 3, 4 show the information for the SOT-223 package.
Figure 4 assumes a θ
51˚C/W for 2 ounce copper and a maximum junction tem-
perature of 125˚C.
FIGURE 3. θ
See NS Package Number T03B
(J−A)
Order Number LM337T
(H−A)
SOT-223 Package
vs Copper (2 ounce) Area for the
(J−A)
Plastic Package
is found using the equation shown,
Front View
of 75˚C/W for 1 ounce copper and
TO-220
(Continued)
00906707
00906732
5
Package Marked N02A See NS Package Number MP04A
Please see AN1028 for power enhancement techniques to
be used with the SOT-223 package.
FIGURE 4. Maximum Power Dissipation vs. T
Order Number LM337IMP
the SOT-223 Package
3-Lead SOT-223
Front View
00906734
00906733
www.national.com
AMB
for