LM337LMX National Semiconductor, LM337LMX Datasheet

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LM337LMX

Manufacturer Part Number
LM337LMX
Description
IC,VOLT REGULATOR,ADJUSTABLE,-1.2 TO -37V,BIPOLAR,SOP,8PIN,PLASTIC
Manufacturer
National Semiconductor
Type
Voltage Regulatorr
Datasheet

Specifications of LM337LMX

Rohs Compliant
NO
Current, Output
100 mA
Load Regulation
0.3% (Typ.)
Noise Voltage, Output
0.003% (Typ.)
Package Type
SOIC-8
Regulation, Line
0.01 %/V
Regulation, Load
0.1 %
Regulator Type
Negative Voltage Out
Ripple, Rejection
77 dB (Typ.)
Temperature, Operating
0 to +125 °C
Temperature, Operating, Range
-25 to +125 °C
Temperature, Storage
-65 to +150 °C
Voltage, Input
40 V
Voltage, Noise
0.003 %
Voltage, Output
1.2 to 37 V
Voltage, Supply, Rejection Ratio
80 dB

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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. A larger 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
Typical Application
1.2V-25V Adjustable Regulator
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
n Adjustable output down to 1.2V
n Guaranteed 100mA output current
n Line regulation typically 0.01%/V
n Load regulation typically 0.1%
n Current limit constant with temperature
n Eliminates the need to stock many voltages
n Standard 3-lead transistor package
n 80 dB ripple rejection
n Output is short circuit protected
n Available in the 6-Bump micro SMD package
n See AN-1112 for micro SMD considerations
00913403

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LM337LMX Summary of contents

Page 1

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 exceptionally easy to use and requires only two external resistors to set ...

Page 2

... TO92 00913401 Bottom View 6-Bump micro SMD Ordering Information Package Part Number 3-Pin TO92 LM337LZ LM337LM 8-Pin SOIC LM337LMX LM337LBL 6-Bump micro SMD LM337LBLX micro SMD Laser mark 00913408 Package Marking Transport Media LM337LZ 1800 per Bag LM337LM 2.5k Units Tape and Reel ...

Page 3

... Absolute Maximum Ratings 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 Electrical Characteristics Parameter Line Regulation T (Note 3) Load Regulation T Thermal Regulation T Adjustment Pin Current 5mA ≤ ...

Page 4

Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Package Number M08A 3-Pin TO-92 (Z) NS Package Number Z03A 5 ...

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