LM337L 3-Terminal Adjustable Regulator General 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. 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 micro SMD 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 n n Adjustable output down to 1.2V Guaranteed 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 micro SMD package See AN-1112 for micro SMD considerations Typical Application 1.2V-25V Adjustable Regulator 00913403 © 2002 National Semiconductor Corporation DS009134 www.national.com LM337L 3-Terminal Adjustable Regulator February 2002 LM337L Connection Diagrams 3-Pin TO92 8-Pin SOIC 00913401 Bottom View 00913402 Top View 6-Bump micro SMD micro SMD Laser mark 00913407 00913408 Ordering Information Package Part Number Package Marking Transport Media NSC Drawing 3-Pin TO92 LM337LZ LM337LZ 1800 per Bag Z03A LM337LM LM337LM 8-Pin SOIC 6-Bump micro SMD www.national.com LM337LMX LM337LBL LM337LBLX Rails 2.5k Units Tape and Reel PA 2 250 Units Tape and Reel 3k Units Tape and Reel M08A BLA06FNB (Note 1) Storage Temperature Lead Temperature (Soldering, 10 sec.) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Operating Junction Temperature Range 300˚C Plastic Package (Soldering 4 sec.) Internally Limited Input–Output Voltage Differential −55˚C to +150˚C ESD Rating 260˚C 1.5kV (Note 5) 40V −25˚C to +125˚C Electrical Characteristics (Note 2) Parameter Line Regulation Conditions Min TA = 25˚C, 3V ≤ |VIN − VOUT| ≤ 40V, Typ Max Units 0.01 0.04 %/V (Note 3) Load Regulation TA = 25˚C, 5mA ≤ IOUT ≤ IMAX, (Note 3) 0.1 0.5 % Thermal Regulation TA = 25˚C, 10ms Pulse 0.04 0.2 %/W 50 100 µA 0.2 5 µA 1.25 1.30 V %/V Adjustment Pin Current Adjustment Pin Current Change 5mA ≤ IL ≤ 100mA 3V ≤ |VIN − VOUT| ≤ 40V Reference Voltage 3V ≤ |VIN − VOUT| ≤ 40V, (Note 4) 1.20 10mA ≤ IOUT ≤ 100mA, P ≤ 625mW Line Regulation 3V ≤ |VIN − VOUT| ≤ 40V, (Note 3) 0.02 0.07 Load Regulation 5mA ≤ IOUT ≤ 100mA, (Note 3) 0.3 1.5 Temperature Stability TMIN ≤ Tj ≤ TMAX 0.65 |VIN − VOUT| ≤ 40V 3.5 5 mA 3V ≤ |VIN − VOUT| ≤ 15V 2.2 3.5 mA 200 320 mA 50 120 mA Minimum Load Current Current Limit 3V ≤ |VIN − VOUT| ≤ 13V 100 |VIN − VOUT| = 40V 25 Rms Output Noise, % of VOUT TA = 25˚C, 10Hz ≤ f ≤ 10kHz Ripple Rejection Ratio VOUT = −10V, F = 120 Hz, CADJ = 0 CADJ = 10µF Long-Term Stability 66 TA = 125˚C % % 0.003 % 65 dB 80 dB 0.3 1 % Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 2: Unless otherwise specified, these specifications apply −25˚C ≤ TJ ≤ + 125˚C for the LM337L; |VIN − VOUT| = 5V and IOUT = 40mA. Although power dissipation is internally limited, these specifications are applicable for power dissipations up to 625 mW. IMAX is 100mA. Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 4: Thermal resistance of the TO-92 package is 180˚C/W junction to ambient with 0.4" leads from a PC board and 160˚C/W junction to ambient with 0.125" lead length to PC board. The M package θJA is 180˚C/W in still air. The 6-Bump micro SMD package θJA is 290˚C/W in still air. Note 5: Human body model, 1.5kΩ in series with 100pF. 3 www.national.com LM337L Absolute Maximum Ratings LM337L Typical Applications Regulator with Trimmable Output Voltage 1.2V-25V Adjustable Regulator 00913403 Full output current not available at high input-output voltages 00913404 Trim Procedure: — If VOUT is −23.08V or bigger, cut out R3 (if smaller, don’t cut it out). — Then if VOUT is −22.47V or bigger, cut out R4 (if smaller, don’t). — Then if VOUT is −22.16V or bigger, cut out R5 (if smaller, don’t). †C1 = 1µF solid tantalum or 10µF aluminum electrolytic required for This will trim the output to well within 1% of −22.00 VDC, without any of the expense or trouble of a trim pot (see LB-46). Of course, this technique can be used at any output voltage level. stability *C2 = 1µF solid tantalum is required only if regulator is more than 4" from power supply filter capacitor www.national.com 4 LM337L Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Package Number M08A 3-Pin TO-92 (Z) NS Package Number Z03A 5 www.national.com LM337L 3-Terminal Adjustable Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 6-Bump micro SMD NS Package Number BLA06FNB X1 = 1133µm X2 = 1819µm X3 = 945µm NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING. 2. 63Sn/37Pb EUTECTIC BUMP. 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTERCLOCKWISE. 5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH. X2 IS PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT (SEE TABLE, SHEET 2). 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