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LM150/LM350A/LM350 3-Amp Adjustable Regulators

May 1998

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 andload regulation are comparable 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 protectioncircuitry remains fully functional even if the adjustment terminal is accidentally disconnected. Normally, no capacitors are needed unless the device is situated 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 bypassing the adjustment pin will increase the regulator’s ripple rejection.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 resistorbetween the adjustment pin and output, the LM150 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 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 suffixare packaged in a TO-220 plastic package. The LM150 is rated for −55˚C ≤ TJ ≤ +150˚C, while the LM350A is rated for −40˚C ≤ TJ ≤ +125˚C, and the LM350 is rated for 0˚C ≤ TJ ≤ +125˚C.

n n n n n n n n n n Adjustable output down to 1.2V Guaranteed 3A output current Guaranteed thermal regulation Output is short circuit protected Current limit constant with temperature P+ ProductEnhancement tested 86 dB ripple rejection Guaranteed 1% output voltage tolerance (LM350A) Guaranteed max. 0.01%/V line regulation (LM350A) Guaranteed max. 0.3% load regulation (LM350A)

n Adjustable power supplies n Constant current regulators n Battery chargers

Connection Diagrams
(TO-3 STEEL) Metal Can Package (TO-220) Plastic Package



Case is OutputFront View Order Number LM350AT or LM350T See NS Package Number T03B

Bottom View Order Number LM150K STEEL or LM350K STEEL See NS Package Number K02A Order Number LM150K/883 See NS Package Number K02C

© 1999 National Semiconductor Corporation


Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact theNational Semiconductor Sales Office/ Distributors for availability and specifications. (Note 4) Power Dissipation Input-Output Voltage Differential Storage Temperature Internally Limited +35V −65˚C to +150˚C

Lead Temperature Metal Package (Soldering, 10 sec.) Plastic Package (Soldering, 4 sec.) ESD Tolerance Operating Temperature Range LM150 LM350A LM350

300˚C 260˚C TBD −55˚C ≤ TJ ≤ +150˚C −40˚C≤ TJ ≤ +125˚C 0˚C ≤ TJ ≤ +125˚C

Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN− VOUT = 5V, and IOUT = 10 mA. (Note 2) Parameter Reference Voltage Line Regulation Load Regulation Thermal Regulation Adjustment Pin Current Adjustment Pin Current Change...
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