LM137H/883 - NATIONAL SEMICONDUCTOR

LM137,LM337

LM137/LM337 3-Terminal Adjustable Negative Regulators

Literature Number: SNVS778C

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

nOutput voltage adjustable from −1.2V to −37V

n1.5A output current guaranteed, −55˚C to +150˚C

nLine regulation typically 0.01%/V

nLoad regulation typically 0.3%

nExcellent thermal regulation, 0.002%/W

n77 dB ripple rejection

nExcellent rejection of thermal transients

n50 ppm/˚C temperature coefficient

nTemperature-independent current limit

nInternal thermal overload protection

Product Enhancement tested

nStandard 3-lead transistor package

nOutput 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=1µFsolid tantalum or 10 µF aluminum electrolytic required for

stability

*C2=1µFsolid 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 2004

LM137/LM337 3-Terminal Adjustable Negative Regulators

Absolute Maximum Ratings (Notes 1,

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

= 25˚C, 3V ≤|V

−V

OUT

|≤40V 0.01 0.02 0.01 0.04 %/V

(Note 2) I

=10mA

Load Regulation T

= 25˚C, 10 mA ≤I

OUT

≤I

MAX

0.3 0.5 0.3 1.0 %

Thermal Regulation T

= 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

≤I

MAX

25 25µA

3.0V ≤|V

−V

OUT

|≤40V,

= 25˚C

Reference Voltage T

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

3V ≤|V

−V

OUT

|≤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 ≤|V

−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

≤T

MAX

0.6 0.6 %

Minimum Load Current |V

−V

OUT

|≤40V 2.5 5 2.5 10 mA

−V

OUT

|≤10V 1.2 3 1.5 6 mA

Current Limit |V

−V

OUT

|≤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

OUT

| = 40V, T

= 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

= 25˚C, 10 Hz ≤f≤10 kHz 0.003 0.003 %

Ripple Rejection Ratio V

OUT

= −10V, f = 120 Hz 60 60 dB

ADJ

=10µF 66 77 66 77 dB

Long-Term Stability T

= 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

170

˚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 IOUT

= 0.1A for the TO-39 package and IOUT = 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. IMAX 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

⁄

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

Note 3: Selected devices with tightened tolerance reference voltage available.

LM137/LM337

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Electrical Characteristics (Note 1) (Continued)

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 es-

pecially 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 coeffi-

cient, 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

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, VOUT = −10V

VIN −V

OUT = −40V

IIL =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

TO-39

Metal Can Package

00906705

Case is Input

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

00906706

Case Is Input

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

Bottom View

Order Number LM137H, LM137H/883 or LM337H

LM137HPQML and LM137HPQMLV(Note 5)

See NS Package Number H03A

00906704

LM137, VOUT = −10V

VIN −V

OUT = −40V

IL=0A→0.25A →0A

Horizontal sensitivity, 20 ms/div

FIGURE 2.

LM137/LM337

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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

(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 tem-

perature of 125˚C.

Please see AN1028 for power enhancement techniques to

be used with the SOT-223 package.

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

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 −VOUT is larger than −25V, D2

protects the LM137 in case the output is shorted

−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 MP04A

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

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.

For the most current product information visit us at www.national.com.

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2. A critical component is any component of a life support

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LM137/LM337 3-Terminal Adjustable Negative Regulators

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