LM150 National Semiconductor, LM150 Datasheet
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LM150
Manufacturer Part Number
LM150
Description
3-Amp Adjustable Regulators
Manufacturer
National Semiconductor
Datasheet
1.LM150.pdf
(14 pages)
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© 1999 National Semiconductor Corporation
LM150/LM350A/LM350
3-Amp Adjustable Regulators
General Description
The LM150 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 3A over a
1.2V to 33V output range. They are exceptionally easy to
use and require only 2 external resistors to set the output
voltage. Further, both line and load regulation are compa-
rable to discrete designs. Also, the LM150 is packaged in
standard transistor packages which are easily mounted and
handled.
In addition to higher performance than fixed regulators, the
LM150 series offers full overload protection available only in
IC’s. 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 termi-
nal is accidentally disconnected.
Normally, no capacitors are needed unless the device is situ-
ated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An output capacitor
can be added to improve transient response, while bypass-
ing the adjustment pin will increase the regulator’s ripple re-
jection.
Besides replacing fixed regulators or discrete designs, the
LM150 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, i.e., avoid short-circuiting the output.
By connecting a fixed resistor between the adjustment pin
and output, the LM150 can be used as a precision current
Connection Diagrams
Case is Output
See NS Package Number K02A
See NS Package Number K02C
Order Number LM150K STEEL
Order Number LM150K/883
Metal Can Package
or LM350K STEEL
(TO-3 STEEL)
Bottom View
DS009061-4
DS009061
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 part numbers in the LM150 series which have a K suffix
are packaged in a standard Steel TO-3 package, while those
with a T suffix are packaged in a TO-220 plastic package.
The LM150 is rated for −55˚C
LM350A is rated for −40˚C
rated for 0˚C
Features
n Adjustable output down to 1.2V
n Guaranteed 3A output current
n Guaranteed thermal regulation
n Output is short circuit protected
n Current limit constant with temperature
n P
n 86 dB ripple rejection
n Guaranteed 1% output voltage tolerance (LM350A)
n Guaranteed max. 0.01%/V line regulation (LM350A)
n Guaranteed max. 0.3% load regulation (LM350A)
Applications
n Adjustable power supplies
n Constant current regulators
n Battery chargers
+
Product Enhancement tested
Order Number LM350AT or LM350T
See NS Package Number T03B
T
J
+125˚C.
Plastic Package
Front View
(TO-220)
T
J
+125˚C, and the LM350 is
T
J
+150˚C, while the
DS009061-5
www.national.com
May 1998