LM337MP National Semiconductor, LM337MP Datasheet

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LM337MP

Manufacturer Part Number
LM337MP
Description
3-Terminal Adjustable Negative Regulator
Manufacturer
National Semiconductor
Datasheet

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© 2001 National Semiconductor Corporation
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
resistors 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%
Typical Applications
Full output current not available at high input-output voltages
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
C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for
Adjustable Negative Voltage Regulator
DS009067
00906701
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
n Standard 3-lead transistor package
n Output is short circuit protected
Comparison between SOT-223 and
D-Pak (TO-252) Packages
LM137/337
LM337
LM337
+
Device
LM137 Series Packages and Power Capability
Product Enhancement tested
TO-3 (K)
TO-39 (H)
TO-220 (T)
SOT-223
(MP)
Package
Scale 1:1
Dissipation
Power
Rated
20W
15W
2W
2W
00906731
November 2001
www.national.com
Current
Design
Load
1.5A
0.5A
1.5A
1A

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LM337MP Summary of contents

Page 1

... 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 © 2001 National Semiconductor Corporation n Excellent thermal regulation, 0.002%/ ripple rejection n Excellent rejection of thermal transients n 50 ppm/˚ ...

Page 2

... Absolute Maximum Ratings 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Input-Output Voltage Differential Operating Junction Temperature Range LM137 Electrical Characteristics Parameter Line Regulation T j (Note 2) I Load Regulation ...

Page 3

Electrical Characteristics Note 3: Selected devices with tightened tolerance reference voltage available. Note 4: Refer to RETS137H drawing for LM137H or RETS137K drawing for LM137K military specifications. Schematic Diagram Thermal Regulation When power is dissipated in an IC, a temperature ...

Page 4

Thermal Regulation (Continued) In Figure typical LM137’s output drifts only 3 mV (or 0.03 −10V) when a 10W pulse is applied for OUT 10 ms. This performance is thus well inside the specification limit ...

Page 5

Application Hints When a value for is found using the equation shown, (H−A) 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 ...

Page 6

Typical Applications −5.2V Regulator with Electronic Shutdown *Minimum output . −1.3V when control input is low Adjustable Current Regulator www.national.com (Continued) * 00906710 00906712 6 High Stability −10V Regulator 00906714 ...

Page 7

Typical Performance Characteristics Load Regulation Adjustment Current Temperature Stability (K Steel and T Packages) 00906716 00906718 Minimum Operating Current 00906720 7 Current Limit 00906717 Dropout Voltage 00906719 00906721 www.national.com ...

Page 8

Typical Performance Characteristics Ripple Rejection Ripple Rejection Line Transient Response www.national.com (K Steel and T Packages) (Continued) 00906722 00906724 Load Transient Response 00906726 8 Ripple Rejection 00906723 Output Impedance 00906725 00906727 ...

Page 9

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM137H, LM137H/883 or LM337H Metal Can Package (H) NS Package Number H03A 9 www.national.com ...

Page 10

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Metal Can Package (K) Order Number LM337K STEEL NS Package Number K02A Mil-Aero Metal Can Package (K) Order Number LM137K/883 NS Package Number K02C 10 ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 3-Lead SOT-223 Package Order Number LM337IMP NS Package Number M04A 11 www.national.com ...

Page 12

... 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 ...

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