SNVS780D – MAY 1998 – REVISED MAY 2013
LM337L 3-Terminal Adjustable Regulator
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FEATURES
Adjustable Output Down to 1.2V
Ensured 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 DSBGA Package
See AN-1112 (Literature Number
for
DSBGA Considerations
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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 DSBGA
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.
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.
Typical Application
1.2V-25V Adjustable Regulator
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Copyright © 1998–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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