LM337L
3-Terminal Adjustable Regulator
General Description
The LM337L is an adjustable 3-terminal negative voltage
regulator capable of supplying 100mA over a 1.2V to 37V
output range. It is exceptionally easy to use and requires
only two external resistors to set the output voltage. Further-
more, both line and load regulation are better than standard
fixed regulators.Also, the LM337L is packaged in a standard
TO-92 transistor package which is easy to use.
In addition to higher performance than fixed regulators, the
LM337L offers full overload protection. Included on the chip
are current limit, thermal overload protection and safe area
protection.All overload protection circuitry remains fully func-
tional even if the adjustment terminal is disconnected.
Normally, only a single 1µF solid tantalum output capacitor is
needed unless the device is situated more than 6 inches
from the input filter capacitors, in which case an input bypass
is needed.Alarger output capacitor can be added to improve
transient response. The adjustment terminal can be by-
passed to achieve very high ripple rejection ratios which are
difficult to achieve with standard 3-terminal regulators.
Besides replacing fixed regulators, the LM337L is useful in a
wide variety of other applications. Since the regulator is
“floating” and sees only the input-to-output differential volt-
age, supplies of several hundred volts can be regulated as
long as the maximum input-to-output differential is not ex-
ceeded.
Also, it makes an especially simple adjustable switching
regulator, a programmable output regulator, or by connecting
a fixed resistor between the adjustment and output, the
LM337L can be used as a precision current regulator. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put to 1.2V where most loads draw little current.
The LM337L is available in a standard TO-92 transistor
package, SO-8 surface mount package, and in our new 12
mil diameter bump micro SMD package. The LM337L is
rated for operation over a −25˚C to +125˚C range.
For applications requiring greater output current in excess of
0.5A and 1.5A, see LM137 series data sheets. For the
positive complement, see series LM117 and LM317L data
sheets.
Features
nAdjustable output down to 1.2V
nGuaranteed 100mA output current
nLine regulation typically 0.01%/V
nLoad regulation typically 0.1%
nCurrent limit constant with temperature
nEliminates the need to stock many voltages
nStandard 3-lead transistor package
n80 dB ripple rejection
nOutput is short circuit protected
nAvailable in the 6-Bump micro SMD package
nSee AN-1112 for micro SMD considerations
Typical Application
1.2V-25V Adjustable Regulator
00913403
February 2002
LM337L 3-Terminal Adjustable Regulator
© 2002 National Semiconductor Corporation DS009134 www.national.com
Connection Diagrams
3-Pin TO92 8-Pin SOIC
00913401
Bottom View 00913402
Top View
6-Bump micro SMD micro SMD Laser mark
00913408
00913407
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
3-Pin TO92 LM337LZ LM337LZ 1800 per Bag Z03A
8-Pin SOIC LM337LM LM337LM Rails M08A
LM337LMX 2.5k Units Tape and Reel
6-Bump micro SMD LM337LBL PA 250 Units Tape and Reel BLA06FNB
LM337LBLX 3k Units Tape and Reel
LM337L
www.national.com 2
Absolute Maximum Ratings (Note 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 −25˚C to +125˚C
Storage Temperature −55˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.) 300˚C
Plastic Package (Soldering 4 sec.) 260˚C
ESD Rating 1.5kV (Note 5)
Electrical Characteristics (Note 2)
Parameter Conditions Min Typ Max Units
Line Regulation T
A
= 25˚C, 3V ≤|V
IN
−V
OUT
|≤40V, 0.01 0.04 %/V
(Note 3)
Load Regulation T
A
= 25˚C, 5mA ≤I
OUT
≤I
MAX
, (Note 3) 0.1 0.5 %
Thermal Regulation T
A
= 25˚C, 10ms Pulse 0.04 0.2 %/W
Adjustment Pin Current 50 100 µA
Adjustment Pin Current Change 5mA ≤I
L
≤100mA 0.2 5 µA
3V ≤|V
IN
−V
OUT
|≤40V
Reference Voltage 3V ≤|V
IN
−V
OUT
|≤40V, (Note 4) 1.20 1.25 1.30 V
10mA ≤I
OUT
≤100mA, P ≤625mW
Line Regulation 3V ≤|V
IN
−V
OUT
|≤40V, (Note 3) 0.02 0.07 %/V
Load Regulation 5mA ≤I
OUT
≤100mA, (Note 3) 0.3 1.5 %
Temperature Stability T
MIN
≤T
j
≤T
MAX
0.65 %
Minimum Load Current |V
IN
−V
OUT
|≤40V 3.5 5 mA
3V ≤|V
IN
−V
OUT
|≤15V 2.2 3.5 mA
Current Limit 3V ≤|V
IN
−V
OUT
|≤13V 100 200 320 mA
|V
IN
−V
OUT
| = 40V 25 50 120 mA
Rms Output Noise, % of V
OUT
T
A
= 25˚C, 10Hz ≤f≤10kHz 0.003 %
Ripple Rejection Ratio V
OUT
= −10V, F = 120 Hz, C
ADJ
= 0 65 dB
C
ADJ
= 10µF 66 80 dB
Long-Term Stability T
A
= 125˚C 0.3 1 %
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: Unless otherwise specified, these specifications apply −25˚C ≤TJ≤+ 125˚C for the LM337L; |VIN −V
OUT| = 5V and IOUT = 40mA. Although power
dissipation is internally limited, these specifications are applicable for power dissipations up to 625 mW. IMAX is 100mA.
Note 3: 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.
Note 4: Thermal resistance of the TO-92 package is 180˚C/W junction to ambient with 0.4" leads from a PC board and 160˚C/W junction to ambient with 0.125" lead
length to PC board. The M package θJA is 180˚C/W in still air. The 6-Bump micro SMD package θJA is 290˚C/W in still air.
Note 5: Human body model, 1.5kΩin series with 100pF.
LM337L
www.national.com3
Typical Applications
1.2V-25V Adjustable Regulator
00913403
Full output current not available at high input-output voltages
†C1 = 1µF solid tantalum or 10µF aluminum electrolytic required for
stability
*C2 = 1µF solid tantalum is required only if regulator is more than 4" from
power supply filter capacitor
Regulator with Trimmable Output Voltage
00913404
Trim Procedure:
—IfVOUT is −23.08V or bigger, cut out R3 (if smaller, don’t cut it out).
—Then if VOUT is −22.47V or bigger, cut out R4 (if smaller, don’t).
—Then if VOUT is −22.16V or bigger, cut out R5 (if smaller, don’t).
This will trim the output to well within 1% of −22.00 VDC, without any of the
expense or trouble of a trim pot (see LB-46). Of course, this technique can
be used at any output voltage level.
LM337L
www.national.com 4
Physical Dimensions inches (millimeters)
unless otherwise noted
8-Pin SOIC
NS Package Number M08A
3-Pin TO-92 (Z)
NS Package Number Z03A
LM337L
www.national.com5
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
6-Bump micro SMD
NS Package Number BLA06FNB
X1 = 1133µm X2 = 1819µm X3 = 945µm
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING.
2. 63Sn/37Pb EUTECTIC BUMP.
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED
COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH. X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT (SEE TABLE, SHEET 2). EXAMPLE: BLA06AFA HAS WIDTH = 1006. LENGTH = 1641, HEIGHT = 795.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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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.
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www.national.com
LM337L 3-Terminal Adjustable Regulator
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.
National P/N LM337L - 3-Terminal Adjustable Regulator
See A/D Converters
Products
Products > Analog - Regulators > Linear Regulators - Standard/NPN > Negative Voltage - Adjustable >
LM337L
LM337L Product Folder
3-Terminal Adjustable Regulator
Generic P/N 337L
General
Description Features Datasheet Package
& Models Samples
& Pricing
Parametric Table Parametric Table
Multiple Output Capability No
On/Off Pin No
Error Flag -
Input Voltage, min (Volt) -40
Input Voltage, max (Volt) -4.20
Output Current, max 100 mA
Watchdog -
Output Voltage, min (Volt) -37
Output Voltage, max (Volt) -1.20
Datasheet
Title Size in
Kbytes Date View Online Download Receive via
Email
LM337L 3-Terminal Adjustable Regulator 118
Kbytes
4-
Mar-
02 View Online Download Receive via
Email
LM337L 3-Terminal Adjustable Regulator (JAPANESE)84
Kbytes
View Online
Download
Receive via
Email
If you have trouble printing or viewing PDF file(s), see Printing Problems.
Package Availability, Models, Samples & Pricing
Part Number Package Status Models Samples &
Electronic
Orders
Budgetary
Pricing Std
Pack
Size
Package
Marking
Type Pins MSL SPICE IBIS Qty $US each
LM337LBL microSMD 6MSL Full
production N/A N/A
Samples
1K+ $0.3200 reel
of
250
¢1¢IP
$I¢CA
LM337LBLX microSMD 6MSL Full
production N/A N/A 1K+ $0.3200 reel
of
3000
¢1¢IP
$I¢CA
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National P/N LM337L - 3-Terminal Adjustable Regulator
LM337LM SOIC
NARROW 8MSL Full
production N/A N/A
24 Hour
Samples
Buy Now
1K+ $0.3150 rail
of
95
[logo]¢2¢T
LM337
LM
LM337LMX SOIC
NARROW 8MSL Full
production N/A N/A
Buy Now
1K+ $0.3150 reel
of
2500
[logo]¢2¢T
LM337
LM
LM337LZ TO 92 3MSL Full
production N/A N/A
Buy Now
1K+ $0.3150 box
of
1800
[logo]¢2¢T
LM337
LZ
LM337L MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM337L MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
General Description
The LM337L is an adjustable 3-terminal negative voltage regulator capable of supplying 100mA over a 1.2V
to 37V output range. It is exceptionally easy to use and requires only two external resistors to set the output
voltage. Furthermore, both line and load regulation are better than standard fixed regulators. Also, the
LM337L is packaged in a standard TO-92 transistor package which is easy to use.
In addition to higher performance than fixed regulators, the LM337L offers full overload protection. Included
on the chip are current limit, thermal overload protection and safe area protection. All overload protection
circuitry remains fully functional even if the adjustment terminal is disconnected.
Normally, only a single 1µF solid tantalum output capacitor is needed unless the device is situated more than
6 inches from the input filter capacitors, in which case an input bypass is needed. A larger output capacitor
can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high
ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators.
Besides replacing fixed regulators, the LM337L is useful in a wide variety of other applications. Since the
regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts
can be regulated as long as the maximum input-to-output differential is not exceeded.
Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the LM337L can be used as a precision
current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to
ground which programs the output to 1.2V where most loads draw little current.
The LM337L is available in a standard TO-92 transistor package, SO-8 surface mount package, and in our
new 12 mil diameter bump micro SMD package. The LM337L is rated for operation over a -25°C to +125°C
range.
For applications requiring greater output current in excess of 0.5A and 1.5A, see LM137 series data sheets.
For the positive complement, see series LM117 and LM317L data sheets.
Features
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National P/N LM337L - 3-Terminal Adjustable Regulator
● Adjustable output down to 1.2V
● Guaranteed 100mA output current
● Line regulation typically 0.01%/V
● Load regulation typically 0.1%
● Current limit constant with temperature
● Eliminates the need to stock many voltages
● Standard 3-lead transistor package
● 80 dB ripple rejection
● Output is short circuit protected
● Available in the 6-Bump micro SMD package
● See AN-1112 for micro SMD considerations
[Information as of 5-Aug-2002]
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