Datasheet LM337MP Datasheet (NSC)

LM137/LM337
3-Terminal Adjustable Negative Regulators

General Description

The LM137/LM337 are adjustable 3-terminal negative volt­age 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 opti­mized 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 in­cluding local on-card regulation, programmable-output volt­age 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

Rated Design

Device Package Power Load

Dissipation Current

LM137/337 TO-3 (K) 20W 1.5A

TO-39 (H) 2W 0.5A
LM337 TO-220 (T) 15W 1.5A
LM337 SOT-223

(MP)

2W 1A

Typical Applications

Adjustable Negative Voltage Regulator

00906701

Full output current not available at high input-output voltages

†

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

Comparison between SOT-223 and
D-Pak (TO-252) Packages

00906731

Scale 1:1

November 2001

LM137/LM337 3-Terminal Adjustable Negative Regulators

© 2001 National Semiconductor Corporation DS009067 www.national.com

Absolute Maximum Ratings (Notes 1,

4)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Power Dissipation Internally Limited
Input-Output Voltage Differential 40V
Operating Junction Temperature

Range

LM137 −55˚C to +150˚C

LM337 0˚C to +125˚C

LM337I −40˚C to +125˚C
Storage Temperature −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.) 300˚C
Plastic Package (Soldering, 4 sec.) 260˚C
ESD Rating 2k Volts

Electrical Characteristics (Note 1)

Parameter Conditions LM137 LM337 Units

Min Typ Max Min Typ Max

Line Regulation T

j

= 25˚C, 3V ≤ |VIN−V

OUT

| ≤ 40V 0.01 0.02 0.01 0.04 %/V

(Note 2) I

L

=10mA

Load Regulation T

j

= 25˚C, 10 mA ≤ I

OUT

≤ I

MAX

0.3 0.5 0.3 1.0 %

Thermal Regulation T

j

= 25˚C, 10 ms Pulse 0.002 0.02 0.003 0.04 %/W
Adjustment Pin Current 65 100 65 100 µA
Adjustment Pin Current Charge 10 mA ≤ I

L

≤ I

MAX

25 25µA

3.0V ≤ |V

IN−VOUT

| ≤ 40V,

T

A

= 25˚C

Reference Voltage T

j

= 25˚C (Note 3) −1.225 −1.250 −1.275 −1.213 −1.250 −1.287 V

3V ≤ |V

IN−VOUT

| ≤ 40V, (Note 3) −1.200 −1.250 −1.300 −1.200 −1.250 −1.300 V

10 mA ≤ I

OUT

≤ I

MAX

,P≤P

MAX

Line Regulation 3V ≤ |VIN−V

OUT

| ≤ 40V, (Note 2) 0.02 0.05 0.02 0.07 %/V

Load Regulation 10 mA ≤ I

OUT

≤ I

MAX

, (Note 2) 0.3 1 0.3 1.5 %

Temperature Stability T

MIN

≤ Tj≤ T

MAX

0.6 0.6 %

Minimum Load Current |V

IN−VOUT

| ≤ 40V 2.5 5 2.5 10 mA

|V

IN−VOUT

| ≤ 10V 1.2 3 1.5 6 mA

Current Limit |V

IN−VOUT

| ≤ 15V
K, MP and T Package 1.5 2.2 3.5 1.5 2.2 3.7 A
H Package 0.5 0.8 1.8 0.5 0.8 1.9 A
|V

IN−VOUT

| = 40V, Tj= 25˚C
K, MP and T Package 0.24 0.4 0.15 0.4 A
H Package 0.15 0.17 0.10 0.17 A

RMS Output Noise, % of V

OUT

Tj= 25˚C, 10 Hz ≤ f ≤ 10 kHz 0.003 0.003 %

Ripple Rejection Ratio V

OUT

= −10V, f = 120 Hz 60 60 dB

C

ADJ

=10µF 6677 6677 dB

Long-Term Stability T

j

= 125˚C, 1000 Hours 0.3 1 0.3 1 %

Thermal Resistance, Junction to
Case

H Package 12 15 12 15 ˚C/W
K Package 2.3 3 2.3 3 ˚C/W
T Package 4 ˚C/W

Thermal Resistance, Junction to
Ambient (No Heat Sink)

H Package 140 140 ˚C/W
K Package 35 35 ˚C/W
T Package

MP Package

50

170

˚C/W
˚C/W

Note 1: Unless otherwise specified, these specifications apply −55˚C ≤ Tj≤ +150˚C for the LM137, 0˚C ≤ Tj≤ +125˚C for the LM337; VIN−V

OUT

= 5V; and I

OUT

= 0.1A for the TO-39 package and I

OUT

= 0.5A for the TO-3, SOT-223 and TO-220 packages. Although power dissipation is internally limited, these specifications

are applicable for power dissipations of 2W for the TO-39 and SOT-223 (see Application Hints), and 20W for the TO-3, and TO-220. I

MAX

is 1.5A for the TO-3,

SOT-223 and TO-220 packages, and 0.2A for the TO-39 package.
Note 2: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are

covered under the specification for thermal regulation. Load regulation is measured on the output pin at a point

1

⁄8" below the base of the TO-3 and TO-39 packages.

LM137/LM337

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Electrical Characteristics (Note 1) (Continued)

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

00906702

Thermal Regulation

When power is dissipated in an IC, a temperature gradient
occurs across the IC chip affecting the individual IC circuit
components. With an IC regulator, this gradient can be es­pecially severe since power dissipation is large. Thermal
regulation is the effect of these temperature gradients on
output voltage (in percentage output change) per Watt of
power change in a specified time. Thermal regulation error is
independent of electrical regulation or temperature coeffi­cient, and occurs within 5 ms to 50 ms after a change in
power dissipation. Thermal regulation depends on IC layout
as well as electrical design. The thermal regulation of a
voltage regulator is defined as the percentage change of
V

OUT

, per Watt, within the first 10 ms after a step of power is

applied. The LM137’s specification is 0.02%/W, max.

00906703

LM137, V

OUT

= −10V

V

IN−VOUT

= −40V

I

IL

=0A→0.25A→0A

Vertical sensitivity, 5 mV/div

FIGURE 1.

LM137/LM337

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Thermal Regulation (Continued)

In

Figure 1

, a typical LM137’s output drifts only 3 mV (or

0.03% of V

OUT

= −10V) when a 10W pulse is applied for
10 ms. This performance is thus well inside the specification
limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is
ended, the thermal regulation again showsa3mVstep at
the LM137 chip cools off. Note that the load regulation error
of about 8 mV (0.08%) is additional to the thermal regulation
error.In

Figure 2

, when the 10W pulse is applied for 100 ms,
the output drifts only slightly beyond the drift in the first
10 ms, and the thermal error stays well within 0.1% (10 mV).

Connection Diagrams

TO-3

Metal Can Package

00906705

Bottom View

Order Number LM137K/883

LM137KPQML and LM137KPQMLV(Note 5)

See NS Package Number K02C

Order Number LM337K STEEL

See NS Package Number K02A

Case is Input

TO-39

Metal Can Package

00906706

Bottom View

Order Number LM137H, LM137H/883 or LM337H

LM137HPQML and LM137HPQMLV(Note 5)

See NS Package Number H03A

Case Is Input

Note 5: See STD Mil DWG 5962P99517 for Radiation Tolerant Devices

TO-220

Plastic Package

00906707

Front View

Order Number LM337T

See NS Package Number T03B

3-Lead SOT-223

00906734

Front View

Order Number LM337IMP

Package Marked N02ASee NS Package Number MA04A

00906704

LM137, V

OUT

= −10V

V

IN−VOUT

= −40V

I

L

=0A→0.25A→0A

Horizontal sensitivity, 20 ms/div

FIGURE 2.

LM137/LM337

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Application Hints

When a value for θ

(H−A)

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

(J−A)

of 75˚C/W for 1 ounce copper and
51˚C/W for 2 ounce copper and a maximum junction tem­perature of 125˚C.

Please see AN1028 for power enhancement techniques to
be used with the SOT-223 package.

Typical Applications

Adjustable Lab Voltage Regulator

00906709

Full output current not available
at high input-output voltages
*The 10 µF capacitors are optional to improve ripple rejection

Current Regulator

00906711

Negative Regulator with Protection Diodes

00906713

*

When CLis larger than 20 µF, D1 protects the LM137 in case the input

supply is shorted

**

When C2 is larger than 10 µF and −V

OUT

is larger than −25V, D2

protects the LM137 in case the output is shorted

00906732

FIGURE 3. θ

(J−A)

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

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Typical Applications (Continued)

−5.2V Regulator with Electronic Shutdown

*

00906710

*Minimum output . −1.3V when control input is low

Adjustable Current Regulator

00906712

High Stability −10V Regulator

00906714

LM137/LM337

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Typical Performance Characteristics (K Steel and T Packages)

Load Regulation Current Limit

00906716

00906717

Adjustment Current Dropout Voltage

00906718

00906719

Temperature Stability Minimum Operating Current

00906720

00906721

LM137/LM337

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Typical Performance Characteristics (K Steel and T Packages) (Continued)

Ripple Rejection Ripple Rejection

00906722

00906723

Ripple Rejection Output Impedance

00906724

00906725

Line Transient Response Load Transient Response

00906726

00906727

LM137/LM337

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Physical Dimensions inches (millimeters)

unless otherwise noted

Metal Can Package (H)

Order Number LM137H, LM137H/883 or LM337H

NS Package Number H03A

LM137/LM337

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Physical Dimensions 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

LM137/LM337

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

3-Lead SOT-223 Package
Order Number LM337IMP

NS Package Number M04A

LM137/LM337

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

TO-220 Plastic Package (T)

Order Number LM337T

NS Package Number T03B

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significant injury to the user.

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support device or system whose failure to perform
can be reasonably expected to cause the failure of
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LM137/LM337 3-Terminal Adjustable Negative Regulators

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