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| LM137/LM237 LM337 THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS .OUTPUTVOLTAGEADJUSTABLEDOWNTO .1. .0. .0. .CURRENT .RI .STANDARD .EXCELLENT .50ppm/ Vref 5A GUARANTEED OUTPUT CURRENT 3%/V TYPICAL LOAD REGULATION 01%/V TYPICAL LINE REGULATION LIMIT CONSTANT WITH TEMPERATURE PPLE REJECTION : 77dB 3-LEAD TRANSISTOR PACKAGES THERMAL REGULATION: 0.002%/V C TEMPERATURE COEFFICIENT TO-3 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. PIN CONNECTIONS TO-3 (bottom view) TO-39 (bottom view) TO-220 TO-39 TO-220 (front view) 1 - Adj 2 - Output 3 - Input 1 - Output 2 - Adj Case is input 1 - Adj 2 - Output 3 - input Heatsink surface connected to input March 1993 1/14 LM137-LM237-LM337 ABSOLUTE MAXIMUM RATING Symbol VI - VO IO Toper Input Output Voltage Differential Output Current TO-220/TO-3 TO-39 LM137 LM237 LM337 Tstg Ptot Parameter Value 40 1.5 0.5 -55 to 150 -25 to 150 0 to 125 -65 to 150 Internally Limited oC oC Unit V A W THERMAL CHARACTERISTICS Symbol Parameter TO-3 TO-220 TO-39 Rthj-amb Junction-ambient Thermal Resistance TO-3 TO-220 TO-39 Typ. Max. 4 3 15 35 70 160 o Unit o Rthj-case Junction-case Thermal Resistance C/W C/W ORDER CODES PART NUMBER LM137 LM237 LM337 TEMPERATURE RANGE -55 to 150 oC -25 to 150 oC 0 to 125 C o PACKAGE TO-3 LM137K LM237K LM337K LM237SP LM337SP TO-220 TO-39 LM137H LM237H LM337H 2/14 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 Parameter Reference Voltage Tamb = 25 oC Tmin Tj Tmax 3V |VI - VO| 40V, 10mA |IO| |IO(max)| P Pmax Line Regulation (Tamb = 25 oC, 3V |VI -VO| 40V) - Note 2 IO = 0.1 A IO = 20 mA Load Regulation (Tamb = 25 oC, 10mA |IO| |IO(max)|) - Note 2 |VO| 5V |VO| 5V Thermal Regulation (Tamb = 25 oC, pulse 10 ms) Iadj Iadj Adjustment Pin Current Adjustment Pin Current Change (Tamb = 25 oC, 10mA |IO| |IO(max)|, 3V |VI -VO| 40V) Line Regulation (3V |VI -VO| 40V) - Note 2 Load Regulation (10mA |IO| |IO(max)|) - Note 2 |VO| 5V |VO| 5V Minimum Load Current |VI -V O| 40V |VI -V O| 10V 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) RMS Output Noise (% of VO) Tamb = 25 oC, 10Hz f 10KHz Ripple Rejection Ratio VO = - 10 V, f = 120 Hz Cadj = 10 F Temperature Stability Long Term Stability (Tamb = 125 C, 1000H) o LM137/LM237 Min. -1.225 Typ. -1.25 Max. Min. LM337 Typ. -1.25 Max. -1.287 Unit -1.275 -1.213 V -1.2 -1.25 -1.3 -1.2 -1.25 -1.3 K VI 0.01 0.01 0.02 0.02 0.01 0.01 0.04 0.04 %/V %/V KVO 15 0.3 0.002 65 2 25 0.5 0.02 100 5 15 0.3 0.003 65 2 50 1 0.04 100 5 mV % %/W A A K VI KVO 0.02 0.05 0.02 0.07 %/V 20 0.3 2.5 1.2 1.5 0.5 0.24 0.15 2.2 0.4 0.2 0.003 50 1 5 3 1.5 0.5 0.15 0.1 20 0.3 2.5 1.5 2.2 0.4 0.2 0.003 70 1.5 10 6 mV % mA mA A A A A % |IO(min)| IOS VNO Rvf 66 60 77 0.6 0.3 1 66 60 77 0.6 0.3 1 dB dB % % KVT KVH 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. Figure 1. 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 2. LM 337, V0 = - 10V VI - V0 = - 40V IL = 0A 0.25A 0A Vertical sensitivity 5mV/div. LM 337, V0 = - 10V VI - V0 = - 40V IL = 0A 0.25A 0A Horizontal sensitivity 20msN/div. 7/14 LM137-LM237-LM337 TYPICAL APPLICATIONS ADJUSTABLE NEGATIVE VOLTAGE REGULATOR * C1 = 1F solid tantalum or 10F aluminium electrolytic required for stability. * * C2 = 1F solid tantalum is required only if regulator is more than 10cm from power supply filter capacitor. ADJUSTABLE LAB VOLTAGE REGULATOR * The 10F capacitors are optimal to improve ripple rejection. 8/14 LM137-LM237-LM337 CURRENT REGULATOR NEGATIVE REGULATOR WITH PROTECTION DIODES * When CL is larger than 20F, D1 protects the LM137 in case the input supply is shorted. * * When C2 is larger than 10F 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 MIN. A B C D E G N P R U V 11.00 0.97 1.50 8.32 19.00 10.70 16.50 25.00 4.00 38.50 30.00 TYP. MAX. 13.10 1.15 1.65 8.92 20.00 11.10 17.20 26.00 4.09 39.30 30.30 MIN. 0.433 0.038 0.059 0.327 0.748 0.421 0.649 0.984 0.157 1.515 1.187 inch TYP. MAX. 0.516 0.045 0.065 0.351 0.787 0.437 0.677 1.023 0.161 1.547 1.193 DIM. P G A D C U V O N R B P003F 11/14 E LM137-LM237-LM337 TO-220 MECHANICAL DATA DIM. MIN. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.2 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.9 6.6 4.2 3.85 0.511 0.104 0.598 0.244 0.137 0.147 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.625 0.260 0.165 0.151 mm TYP. MAX. 4.60 1.32 2.72 MIN. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch TYP. MAX. 0.181 0.051 0.107 A C D1 L2 F1 D G1 E Dia. F2 F L5 L7 L6 L9 L4 G 12/14 H2 P011C LM137-LM237-LM337 TO39 MECHANICAL DATA mm DIM. MIN. A B D E F G H I L 5.08 1.2 0.9 45o (typ.) 12.7 0.49 6.6 8.5 9.4 0.200 0.047 0.035 TYP. MAX. MIN. 0.500 0.019 0.260 0.334 0.370 TYP. MAX. inch D G I H E F A L B 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. (c) 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 |
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