LM137/LM237 LM337 THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS

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1 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 TEM- PERATURE RIPPLE REJECTION : 77dB STANDARD 3-LEAD TRANSISTOR PACK- AGES. EXCELLENT THERMAL REGULATION: 0.002%/V 50ppm/ C TEMPERATURE COEFFICIENT TO-3 DESCRIPTION The LM137 series are adjustable 3-terminal negative voltage regulators capable of supplying in excess- 1.5Aover 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-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 1 - Adj 2 - Output 3 - input Heatsink surface connected to input March /14

2 ABSOLUTE MAXIMUM RATING Symbol Parameter Value Unit VI -VO Input Output Voltage Differential 40 V I O Output Current TO-220/TO A TO Toper LM to 150 oc LM to 150 LM337 0 to 125 Tstg -65 to 150 oc Ptot Internally Limited W THERMAL CHARACTERISTICS Symbol Parameter Typ. Max. Unit R thj-case Junction-case Thermal Resistance TO-3 4 o C/W TO TO R thj-amb Junction-ambient Thermal Resistance TO-3 35 o C/W TO TO ORDER CODES PART NUMBER TEMPERATURE PACKAGE RANGE TO-3 TO-220 TO-39 LM to 150 o C LM137K LM137H LM to 150 o C LM237K LM237SP LM237H LM337 0 to 125 o C LM337K LM337SP LM337H 2/14

3 SCHEMATIC DIAGRAM 3/14

4 ELECTRICAL CHARACTERISICS LM137: -55 o C<Tj<150 o C LM237: -25 o C<Tj<150 o C LM337: 0 o C<Tj<150 o C VI-VO=5V,IO= 0.5 A (unless otherwise specified) Symbol Parameter LM137/LM237 LM337 Unit Min. Typ. Max. Min. Typ. Max. V ref Reference Voltage T amb =25 o C Tmin Tj Tmax 3V VI -VO 40V, 10mA IO IO(max) P Pmax V K VI K VO Line Regulation (Tamb =25 o C, 3V VI -VO 40V) - Note 2 IO = 0.1 A IO =20mA Load Regulation (Tamb =25 o C, 10mA IO IO(max) ) - Note 2 VO 5V VO 5V Thermal Regulation (T amb =25 o C, pulse 10 ms) %/W Iadj Adjustment Pin Current µa I adj Adjustment Pin Current Change (Tamb =25 o C, 10mA IO IO(max), 3V VI -VO 40V) %/V %/V mv % µa K VI Line Regulation (3V V I -V O 40V) - Note %/V KVO IO(min) IOS VNO Rvf Load Regulation (10mA I O I O(max) ) - Note 2 V O 5V V O 5V Minimum Load Current V I -V O 40V V I -V O 10V Short Circuit Output Current VI -VO 15V (TO-3 and TO-220) V I -V O 15V (TO-39) V I -V O = 40V, T j =25 o C (TO-3 and TO-220) V I -V O = 40V, T j =25 o C (TO-39) RMS Output Noise (% of VO) T amb =25 o C, 10Hz f 10KHz Ripple Rejection Ratio VO = - 10 V, f = 120 Hz Cadj =10µF mv % ma ma A A A A % K VT Temperature Stability % KVH Long Term Stability (Tamb = 125 o C, 1000H) % Notes : 1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of : 2W for TO-39 15W for TO W for TO-3 Package I O(max) is : 1.5A for TO-3 and TO A for TO 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 db db 4/14

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7 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 VI V0= 40V I L =0A 0.25A 0A Vertical sensitivity 5mV/div. LM 337, V0 = 10V VI V0= 40V I L =0A 0.25A 0A Horizontal sensitivity 20msN/div. 7/14

8 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

9 CURRENT REGULATOR NEGATIVE REGULATOR WITH PROTECTION DIODES * When C L is larger than 20µF, D1 protects the LM137 in case the input supply is shorted. * * When C2 is larger than 10µF and V 0 is larger than 25V, D2 protects the LM137 in case the output is shorted. 9/14

10 * 5.2V REGULATOR WITH ELECTRONIC SHUTDOWN * Minimum output 1.3V when control input is low. ADJUSTABLE CURRENT REGULATOR 10/14

11 TO-3 MECHANICAL DATA DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B C D E G N P R U V P A D G C N O U V B E R P003F 11/14

12 TO-220 MECHANICAL DATA DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A C D D E F F F G G H L L L L L L DIA F G D1 C D A E L2 G1 H2 F1 Dia. L5 L7 L9 F2 L6 L4 P011C 12/14

13 TO39 MECHANICAL DATA DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B D E F G H I L 45 o (typ.) G D A H I F E L B P008B 13/14

14 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. Specificationsmentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronicsproducts are not authorized foruse ascritical componentsin life support devices or systems without express written approval of SGS-THOMSON Microelectonics 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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