LM337IMP National Semiconductor, LM337IMP Datasheet

IC, NEG ADJ REG, -1.2V TO -37V, SOT223-3

LM337IMP

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

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

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© 2004 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 2004
www.national.com
Current
Design
Load
1.5A
0.5A
1.5A
1A

Related parts for LM337IMP

LM337IMP 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 © 2004 National Semiconductor Corporation n Excellent thermal regulation, 0.002%/ ripple rejection n Excellent rejection of thermal transients n 50 ppm/˚C temperature coefficient ...

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 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 gradient occurs across the IC chip affecting the individual IC ...

Page 4

Thermal Regulation (Continued) In Figure 1, a 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 of ...

Page 5

... Package Marked N02A See NS Package Number MP04A 00906707 FIGURE 4. Maximum Power Dissipation vs. T Please see AN1028 for power enhancement techniques to be used with the SOT-223 package. 00906732 5 3-Lead SOT-223 00906734 Front View Order Number LM337IMP 00906733 AMB the SOT-223 Package www.national.com for ...

Page 6

Typical Applications Adjustable Lab Voltage Regulator Full output current not available at high input-output voltages *The 10 µF capacitors are optional to improve ripple rejection Current Regulator Negative Regulator with Protection Diodes *When C is larger than 20 µF, D1 ...

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 MP04A 11 www.national.com ...

Page 12

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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