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参数资料
| 型号： | LM137KPQMLV |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 可调负电压单路输出标准稳压器 |
| 英文描述： | 3-Terminal Adjustable Negative Regulators |
| 中文描述： | 1.2 V-37 V ADJUSTABLE NEGATIVE REGULATOR, MBCY2 |
| 封装： | METAL CAN, TO-3, 3 PIN |
| 文件页数： | 8/12页 |
| 文件大小： | 836K |
| 代理商： | LM137KPQMLV |
Connection Diagrams (Continued)
TO-220
Plastic Package
3-Lead SOT-223
00906707
Front View
Order Number LM337T
See NS Package Number T03B
00906734
Front View
Order Number LM337IMP
Package Marked N02A See NS Package Number MP04A
Application Hints
When a value for
θ
(HA) is found using the equation shown,
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
(JA) of 75C/W for 1 ounce copper and
51C/W for 2 ounce copper and a maximum junction tem-
perature of 125C.
Please see AN1028 for power enhancement techniques to
be used with the SOT-223 package.
00906732
FIGURE 3.
θ
(JA) vs Copper (2 ounce) Area for the
SOT-223 Package
00906733
FIGURE 4. Maximum Power Dissipation vs. T
AMB for
the SOT-223 Package
LM137/LM337
www.national.com
5
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