Maker : National Semiconductor
Part No. : LM337LZ

  Datasheet PDF : LM337LZ.pdf
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Product Information

LM337L 3-Terminal Adjustable Regulator May 1998 LM337L 3-Terminal Adjustable Regulator General Description The LM337L is an adjustable 3-terminal negative voltage regulator capable of supplying 100 mA 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 1 µF 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 and a SO-8 surface mount 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 n n n n n n n n Adjustable output down to 1.2V Guaranteed 100 mA 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 Connection Diagram DS009134-1 Bottom View Top View Order Number LM337LM or LM337LZ See NS Package Number M08A or Z03A DS009134-2 © 1999 National Semiconductor Corporation DS009134 www.national.com 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 Input–Output Voltage Differential Operating Junction Temperature Range Internally Limited 40V −25˚C to +125˚C Storage Temperature Lead Temperature (Soldering, 10 sec.) Plastic Package (Soldering 4 sec.) ESD rating to be determined. −55˚C to +150˚C 300˚C 260˚C Electrical Characteristics (Note 2) Parameter Line Regulation Load Regulation Thermal Regulation Adjustment Pin Current Adjustment Pin Current Change Reference Voltage Line Regulation Load Regulation Temperature Stability Minimum Load Current Current Limit Rms Output Noise, % of VOUT Ripple Rejection Ratio Long-Term Stability 5 mA ≤ IL ≤ 100 mA 3V ≤ |VIN − VOUT| ≤ 40V 3V ≤ |VIN − VOUT| ≤ 40V, (Note 4) 10 mA ≤ IOUT ≤ 100 mA, P ≤ 625 mW 3V ≤ |VIN − VOUT| ≤ 40V, (Note 3) 5 mA ≤ IOUT ≤ 100 mA, (Note 3) TMIN ≤ Tj ≤ TMAX |VIN − VOUT| ≤ 40V 3V ≤ |VIN − VOUT| ≤ 15V 3V ≤ |VIN − VOUT| ≤ 13V |VIN − VOUT| = 40V TA = 25˚C, 10 Hz ≤ f ≤ 10...

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