LM137/LM237 LM337 THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS . .. .. .. . . OUTPUT VOLTAGE ADJUSTABLE DOWN TO Vref 1.5A GUARANTEED OUTPUT CURRENT 0.3%/V TYPICAL LOAD REGULATION 0.01%/V TYPICAL LINE REGULATION CURRENT LIMIT CONSTANT WITH TEMPERATURE RIPPLE REJECTION : 77dB STANDARD 3-LEAD TRANSISTOR PACKAGES EXCELLENT THERMAL REGULATION: 0.002%/V 50ppm/°C TEMPERATURE COEFFICIENT DESCRIPTION The LM137 series are adjustable 3-terminal negative voltage regulators capable of supplying in excess - 1.5A over a -1.2 to - 37V output voltage range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, LM137 regulators are supplied in standard transistor packages which are easily mounted and handled. In addition to higher performance than fixed regulators, the LM137 series offer full overload protection available only in integrated circuits. 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. TO-3 TO-220 TO-39 PIN CONNECTIONS TO-3 (bottom view) TO-39 (bottom view) TO-220 (front view) 1 - Adj 2 - Output 3 - Input 1 - Output 2 - Adj Case is input March 1993 1 - Adj 2 - Output 3 - input Heatsink surface connected to input 1/14 LM137-LM237-LM337 ABSOLUTE MAXIMUM RATING Symbol VI - VO Parameter Input Output Voltage Differential Output Current IO Toper Value Unit 40 V TO-220/TO-3 1.5 A TO-39 0.5 LM137 -55 to 150 LM237 -25 to 150 LM337 0 to 125 oC Tstg -65 to 150 oC Ptot Internally Limited W THERMAL CHARACTERISTICS Symbol Parameter Typ. Rthj-case Junction-case Thermal Resistance Rthj-amb Junction-ambient Thermal Resistance Max. TO-3 4 TO-220 3 C/W TO-39 15 TO-3 35 TO-220 70 TO-39 160 ORDER CODES PART NUMBER TEMPERATURE RANGE TO-3 LM137 -55 to 150 oC LM137K LM237 -25 to 150 oC LM237K LM237SP LM237H LM337K LM337SP LM337H LM337 2/14 o 0 to 125 C PACKAGE TO-220 Unit o TO-39 LM137H o C/W LM137-LM237-LM337 SCHEMATIC DIAGRAM 3/14 LM137-LM237-LM337 ELECTRICAL CHARACTERISICS o o LM137: -55 C < Tj < 150 C o LM237: -25 C < Tj < 150 o C LM337: 0 o C < Tj < 150 o C V I - V O = 5V, I O = 0.5 A (unless otherwise specified) Symbol Vref K VI KVO Parameter LM137/LM237 Typ. Max. -1.225 -1.25 -1.25 -1.287 -1.2 -1.25 -1.3 -1.25 -1.3 Line Regulation (Tamb = 25 oC, 3V ≤ |VI -VO| ≤ 40V) - Note 2 IO = 0.1 A IO = 20 mA 0.01 0.01 0.02 0.02 0.01 0.01 0.04 0.04 %/V %/V Load Regulation (Tamb = 25 oC, 10mA ≤ |IO| ≤ |IO(max)|) - Note 2 |VO| ≤ 5V |VO| ≥ 5V 15 0.3 25 0.5 15 0.3 50 1 mV % 0.002 0.02 0.003 0.04 %/W Adjustment Pin Current 65 100 65 100 µA Adjustment Pin Current Change (Tamb = 25 oC, 10mA ≤ |IO| ≤ |IO(max)|, 3V ≤ |VI -VO| ≤ 40V) Line Regulation (3V ≤ |VI -VO| ≤ 40V) - Note 2 2 5 2 5 µA 0.02 0.05 0.02 0.07 %/V Load Regulation (10mA ≤ |IO| ≤ |IO(max)|) - Note 2 |VO| ≤ 5V |VO| ≥ 5V 20 0.3 50 1 20 0.3 70 1.5 mV % Minimum Load Current |VI -V O| ≤ 40V |VI -V O| ≤ 10V 2.5 1.2 5 3 2.5 1.5 10 6 mA mA Reference Voltage Tamb = 25 oC Tmin ≤ Tj ≤ Tmax 3V ≤ |VI - VO| ≤ 40V, 10mA ≤ |IO| ≤ |IO(max)| P ≤ Pmax Iadj K VI KVO |IO(min)| IOS Short Circuit Output Current |VI -V O| ≤ 15V (TO-3 and TO-220) |VI -V O| ≤ 15V (TO-39) |VI -V O| = 40V, Tj = 25 oC (TO-3 and TO-220) |VI -V O| = 40V, Tj = 25 oC (TO-39) VNO RMS Output Noise (% of VO) Tamb = 25 oC, 10Hz ≤ f ≤ 10KHz Rvf Ripple Rejection Ratio VO = - 10 V, f = 120 Hz Cadj = 10 µF KVT KVH 1.5 0.5 0.24 0.15 Max. Min. Unit Typ. Thermal Regulation (Tamb = 25 oC, pulse 10 ms) ∆Iadj LM337 Min. -1.275 -1.213 2.2 -1.2 1.5 0.5 0.15 0.1 0.4 0.2 0.003 66 Temperature Stability 60 77 66 0.6 o Long Term Stability (Tamb = 125 C, 1000H) 0.3 1 2.2 V 0.4 0.2 A A A A 0.003 % 60 77 dB dB 0.6 % 0.3 1 % Notes : 1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of : • 2W for TO-39 • 15W for TO-220 • 20W for TO-3 Package IO( max) is : • 1.5A for TO-3 and TO-220 • 0.5A for TO-39 2. 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. 4/14 LM137-LM237-LM337 5/14 LM137-LM237-LM337 6/14 LM137-LM237-LM337 THERMAL REGULATION When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the individual IC circuit components. With an IC regulator, this gradient can be especially severe since power dissipation is large. Thermal regulation is the effect of these temperature gradients on output voltage (in percentage output change) per watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or temperature coefficient, and occurs within 5ms to 50ms after a change in power dissipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regulation of a voltage regulator is defined as the percentage change of VO, per watt, within the first 10ms after a step of power, is applied. The LM137 specification is 0.02 %/W max.In figure 1, a typical LM337’s output drifts only 3mV for 0.03% of VO = – 10V) when a 10W pulse is applied for 10ms. This performance is thus well inside the specification limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is ended the thermal regulation again shows a 3mV step as the LM137 chip cools off. Note that the load regulation error of about 8mV(0.08%) is additional to the thermal regulation error. In figure 2, when the 10W pulse is applied for 100ms, the output drifts only slightly beyond the drift in the first 10ms and the thermal error stays well within 0.1% (10mV). Figure 1. Figure 2. LM 337, V0 = – 10V LM 337, V0 = – 10V VI – V0 = – 40V IL = 0A → 0.25A → 0A VI – V0 = – 40V IL = 0A → 0.25A → 0A Vertical sensitivity 5mV/div. Horizontal sensitivity 20msN/div. 7/14 LM137-LM237-LM337 TYPICAL APPLICATIONS ADJUSTABLE NEGATIVE VOLTAGE REGULATOR * C1 = 1µF solid tantalum or 10µF aluminium electrolytic required for stability. * * C2 = 1µF solid tantalum is required only if regulator is more than 10cm from power supply filter capacitor. ADJUSTABLE LAB VOLTAGE REGULATOR * The 10µF capacitors are optimal to improve ripple rejection. 8/14 LM137-LM237-LM337 CURRENT REGULATOR NEGATIVE REGULATOR WITH PROTECTION DIODES * When CL is larger than 20µF, D1 protects the LM137 in case the input supply is shorted. * * When C2 is larger than 10µF and V0 is larger than – 25V, D2 protects the LM137 in case the output is shorted. 9/14 LM137-LM237-LM337 * – 5.2V REGULATOR WITH ELECTRONIC SHUTDOWN * Minimum output ≡ – 1.3V when control input is low. ADJUSTABLE CURRENT REGULATOR 10/14 LM137-LM237-LM337 TO-3 MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. MIN. TYP. MAX. A 11.00 13.10 0.433 0.516 B 0.97 1.15 0.038 0.045 C 1.50 1.65 0.059 0.065 D 8.32 8.92 0.327 0.351 E 19.00 20.00 0.748 0.787 G 10.70 11.10 0.421 0.437 N 16.50 17.20 0.649 0.677 P 25.00 26.00 0.984 1.023 R 4.00 4.09 0.157 0.161 U 38.50 39.30 1.515 1.547 V 30.00 30.30 1.187 1.193 A P C O N B V E G U D R P003F 11/14 LM137-LM237-LM337 TO-220 MECHANICAL DATA mm DIM. MIN. inch MAX. MIN. A 4.40 TYP. 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 D1 TYP. MAX. 0.107 1.27 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 0.409 16.4 0.645 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.2 15.9 0.598 0.625 L7 6.2 6.6 0.244 0.260 L9 3.5 4.2 0.137 0.165 DIA. 3.75 3.85 0.147 0.151 D1 C D A E L4 H2 G G1 F1 L2 F2 F Dia. L5 L9 L7 L6 L4 P011C 12/14 LM137-LM237-LM337 TO39 MECHANICAL DATA mm inch DIM. MIN. A TYP. MAX. MIN. 12.7 TYP. MAX. 0.500 B 0.49 0.019 D 6.6 0.260 E 8.5 0.334 F 9.4 0.370 G 5.08 0.200 H 1.2 0.047 I 0.9 0.035 45o (typ.) L D A G I E F H B L P008B 13/14 LM137-LM237-LM337 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A 14/14