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LM337L Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM337L Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
1 / 5 page 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. 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 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 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 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 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 posi- tive complement, see series LM117 and LM317L data sheets. Features n Adjustable output down to 1.2V n Guaranteed 100 mA 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 Connection Diagram DS009134-1 Bottom View DS009134-2 Top View Order Number LM337LM or LM337LZ See NS Package Number M08A or Z03A May 1998 © 1999 National Semiconductor Corporation DS009134 www.national.com |
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