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PDF LM137HPQMLV Data sheet ( Hoja de datos )
| Número de pieza | LM137HPQMLV | |
| Descripción | 3-Terminal Adjustable Negative Regulators | |
| Fabricantes | National Semiconductor | |
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May 1999
LM137/LM337
3-Terminal Adjustable Negative Regulators
General Description
The LM137/LM337 are adjustable 3-terminal negative volt-
age regulators capable of supplying in excess of −1.5A over
an output voltage range of −1.2V to −37V. These regulators
are exceptionally easy to apply, requiring only 2 external re-
sistors to set the output voltage and 1 output capacitor for
frequency compensation. The circuit design has been opti-
mized for excellent regulation and low thermal transients.
Further, the LM137 series features internal current limiting,
thermal shutdown and safe-area compensation, making
them virtually blowout-proof against overloads.
The LM137/LM337 serve a wide variety of applications in-
cluding local on-card regulation, programmable-output volt-
age regulation or precision current regulation. The LM137/
LM337 are ideal complements to the LM117/LM317
adjustable positive regulators.
Features
n Output voltage adjustable from −1.2V to −37V
n 1.5A output current guaranteed, −55˚C to +150˚C
n Line regulation typically 0.01%/V
n Load regulation typically 0.3%
n Excellent thermal regulation, 0.002%/W
n 77 dB ripple rejection
n Excellent rejection of thermal transients
n 50 ppm/˚C temperature coefficient
n Temperature-independent current limit
n Internal thermal overload protection
n P+ Product Enhancement tested
n Standard 3-lead transistor package
n Output is short circuit protected
LM137 Series Packages and Power
Capability
Device
Package
LM137/337
LM337
LM337
TO-3 (K)
TO-39 (H)
TO-220 (T)
SOT-223
(MP)
Rated
Power
Dissipation
20W
2W
15W
2W
Design
Load
Current
1.5A
0.5A
1.5A
1A
Typical Applications
Adjustable Negative Voltage Regulator
Comparison between SOT-223 and
D-Pak (TO-252) Packages
Full output current not available at high input-output voltages
DS009067-1
†C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for
stability
*C2 = 1 µF solid tantalum is required only if regulator is more than 4" from
power-supply filter capacitor
Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and
rejection of transients
Scale 1:1
DS009067-31
© 1999 National Semiconductor Corporation DS009067
www.national.com
1 page  
Application Hints (Continued)
Typical Applications
Adjustable Lab Voltage Regulator
DS009067-32
FIGURE 3. θ(J−A) vs Copper (2 ounce) Area for the
SOT-223 Package
Full output current not available
at high input-output voltages
*The 10 µF capacitors are optional to improve ripple rejection
Current Regulator
DS009067-9
DS009067-33
FIGURE 4. Maximum Power Dissipation vs TAMB for
the SOT-223 Package
Please see AN1028 for power enhancement techniques to
be used with the SOT-223 package.
DS009067-11
Negative Regulator with Protection Diodes
DS009067-13
*When CL is larger than 20 µF, D1 protects the LM137 in case the input
supply is shorted
**When C2 is larger than 10 µF and −VOUT is larger than −25V, D2
protects the LM137 in case the output is shorted
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-220 Plastic Package (T)
Order Number LM337T
NS Package Number T03B
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
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| PDF Descargar | [ Datasheet LM137HPQMLV.PDF ] | |
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