LT137A/LM137 LT337A/LM337 Negative Adjustable Regulator FEATURES DESCRIPTION n The LT(R)137A/LT337A negative adjustable regulators will deliver up to 1.5A output current over an output voltage range of -1.2V to -37V. Linear Technology has made significant improvements in these regulators compared to previous devices, such as better line and load regulation, and a maximum output voltage error of 1%. n n n n Guaranteed 1% Initial Voltage Tolerance Guaranteed 0.01%/V Line Regulation Guaranteed 0.5% Load Regulation Guaranteed 0.02%/W Thermal Regulation 100% Burn-in in Thermal Limit APPLICATIONS n n n n Every effort has been made to make these devices easy to use and difficult to damage. Internal current and power limiting coupled with true thermal limiting prevents device damage due to overloads or shorts, even if the regulator is not fastened to a heat sink. Adjustable Power Supplies System Power Supplies Precision Voltage/Current Regulators On-Card Regulators Maximum reliability is attained with Linear Technology's advanced processing techniques combined with a 100% burn-in in the thermal limit mode. This assures that all device protection circuits are working and eliminates field failures experienced with other regulators that receive only standard electrical testing. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Negative Regulator Output Voltage Error 12 + C2 5F SOLID TANTALUM -VIN VIN LT137A VOUT 137A TA01 *R2 = R1 | VOUT| -1 1.25V + R1 121 ADJ 1% RESISTORS 2% RESISTORS 11 C3 1F SOLID TANTALUM R2 -VOUT = 1.25V 1 + R1 OUTPUT VOLTAGE ERROR (%) R2* 10 9 8 7 LM337 6 5 4 LT337A 3 2 1 0 1 2 4 6 8 10 20 40 OUTPUT VOLTAGE (V) 100 137A TA01b 137afb 1 LT137A/LM137 LT337A/LM337 ABSOLUTE MAXIMUM RATINGS (Note 1) Power Dissipation ..............................Internally Limited Input to Output Voltage Differential .........................40V Operating Junction Temperature Range LT137A/LM137 .................................. -55C to 150C LT337A/LM337 ...................................... 0C to 125C Storage Temperature Range LT137A/LM137 .................................. -65C to 150C LT337A/LM337 .................................. -65C to 150C Lead Temperature (Soldering, 10 sec.) ................. 300C PRECONDITIONING 100% Thermal Limit Burn-In PIN CONFIGURATION BOTTOM VIEW BOTTOM VIEW ADJ VOUT CASE IS INPUT 2 1 CASE IS VIN 2 3 1 ADJ VIN K PACKAGE 2-LEAD TO-3 METAL CAN JA = 35C/W, JC = 3C/W H PACKAGE 3-LEAD TO-39 METAL CAN JA = 150C/W, JC = 15C/W OBSOLETE PACKAGE Consider the M and T Packages for Alternate Source OBSOLETE PACKAGE Consider the M and T Packages for Alternate Source FRONT VIEW TAB IS INPUT FRONT VIEW TAB IS INPUT VOUT 3 VOUT 2 VIN 1 ADJ M PACKAGE 3-LEAD PLASTIC DD JA = 30C/W, JC = 3C/W 3 VOUT 2 VIN 1 ADJ T PACKAGE 3-LEAD PLASTIC TO-220 JA = 50C/W, JC = 4C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT337AM#PBF LT337AM#TRPBF LT337AM 3-Lead Plastic DD 0C to 125C LT337AT#PBF LT337AT#TRPBF LT337AT 3-Lead Plastic TO-220 0C to 125C LM337T#PBF LM337T#TRPBF LM337T 3-Lead Plastic TO-220 0C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT337AM LT337AM#TR LT337AM 3-Lead Plastic DD 0C to 125C LT337AT LT337AT#TR LT337AT 3-Lead Plastic TO-220 0C to 125C 137afb 2 LT137A/LM137 LT337A/LM337 ORDER INFORMATION LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LM337T LM337T#TR LM337T 3-Lead Plastic TO-220 0C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Notes 2, 3) LT137A SYMBOL PARAMETER VREF Reference Voltage CONDITIONS |VIN - VOUT| = 5V, IOUT = 10mA, Tj = 25C 3V |VIN - VOUT| 40V MIN TYP LM137 MAX MIN TYP MAX -1.238 -1.250 -1.262 -1.225 -1.250 -1.275 l -1.220 -1.250 -1.280 -1.200 -1.250 -1.300 UNITS V V 10mA IOUT IMAX, P PMAX VOUT IOUT VOUT VIN Load Regulation Line Regulation 10mA IOUT IMAX, (Note 4) Tj = 25C, |VOUT| 5V 5 25 15 25 mV Tj = 25C, |VOUT| 5V |VOUT| 5V 0.1 0.5 0.3 0.5 % l 10 50 20 50 mV l 0.2 1 0.3 1 % l 0.005 0.01 0.01 0.03 0.01 0.02 0.02 0.05 |VOUT| 5V 3V |VIN - VOUT| 40V (Note 4) Tj = 25C Ripple Rejection Thermal Regulation VOUT = -10V, f = 120Hz CADJ = 0 CADJ = 10F l 60 70 Tj = 25C, 10ms Pulse 66 80 66 60 77 %/V %/V dB dB 0.002 0.02 0.002 0.02 %/W l 65 100 65 100 A IADJ Adjust Pin Current IADJ Adjust Pin Current Change 10mA IOUT IMAX 3V |VIN - VOUT| 40V l l 0.2 1 2 5 0.5 2 5 5 A A Minimum Load Current |VIN - VOUT| 40V |VIN - VOUT| 10V |VIN - VOUT| 15V, l 2.5 5 2.5 5 mA l 1.2 3 1.2 3 mA ISC Current Limit K and T Package (Note 7) H Package |VIN - VOUT| = 40V, K and T Package Tj = 25C H Package l l l VOUT Temp Temperature Stability of Output Voltage (Note 6) TMIN T TMAX VOUT Time Long Term Stability TA = 125C, 1000 Hours en RMS Output Noise (% of VOUT) TA = 25C, 10Hz f 10kHz JC Thermal Resistance Junction to Case H Package K Package 1.5 0.5 2.2 0.8 1.5 0.5 2.2 0.8 A A 0.24 0.15 0.4 0.25 0.24 0.15 0.4 0.25 A A % 0.6 1.5 0.6 0.3 1 0.3 0.003 12 2.3 1 0.003 15 3 12 2.3 % % 15 3 C/W C/W 137afb 3 LT137A/LM137 LT337A/LM337 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Notes 2, 3) LT337A SYMBOL PARAMETER VREF Reference Voltage CONDITIONS MIN |VIN - VOUT| = 5V, IOUT = 10mA, Tj = 25C 3V |VIN - VOUT| 40V TYP LM337 MAX MIN TYP MAX -1.238 -1.250 -1.262 -1.213 -1.250 -1.287 l -1.220 -1.250 -1.280 -1.200 -1.250 -1.300 UNITS V V 10mA IOUT IMAX, P PMAX VOUT IOUT VOUT VIN Load Regulation Line Regulation Thermal Regulation IADJ ISC Tj = 25C, |VOUT| 5V 5 25 15 50 mV Tj = 25C, |VOUT| 5V |VOUT| 5V 0.1 0.5 0.3 1 % l 10 50 20 70 mV l 0.2 1 0.3 1.5 % l 0.005 0.01 0.01 0.03 0.01 0.02 0.04 0.07 %/V %/V |VOUT| 5V 3V |VIN - VOUT| 40V (Note 4) Tj = 25C Ripple Rejection IADJ 10mA IOUT IMAX, (Notes 4 and 5) VOUT = -10V, f = 120Hz CADJ = 0 CADJ = 10F l 60 70 Tj = 25C, 10ms Pulse 66 80 66 60 77 dB dB 0.002 0.02 0.003 0.04 %/W Adjust Pin Current l 65 100 65 100 A Adjust Pin Current Change 10mA IOUT IMAX 3V |VIN - VOUT| 40V l l 0.2 1 2 5 0.5 2 5 5 A A Minimum Load Current |VIN - VOUT| 40V |VIN - VOUT| 10V |VIN - VOUT| 15V, l 2.5 5 2.5 10 mA l 1.2 3 1 6 mA Current Limit K, M and T Package H Package |VIN - VOUT| = 40V, K, M and T Package Tj = 25C H Package l l l VOUT Temp Temperature Stability of Output Voltage (Note 6) VOUT Time Long Term Stability TA = 125C, 1000 Hours en RMS Output Noise (% of VOUT) TA = 25C, 10Hz f 10kHz JC Thermal Resistance Junction to Case H Package K Package M and T Package Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The shaded electrical specifications indicate those parameters which have been improved or guaranteed test limits provided for the first time. Note 3: Unless otherwise indicated, these specifications apply: |VIN - VOUT| = 5V; and IOUT = 0.1A for the H package, IOUT = 0.5A for the K, M, and T packages. Power dissipation is internally limited. However, these specifications apply for power dissipation up to 2W for the H package and 20W for the K and T packages. IMAX = 1.5A for the K, M, and T packages, and 0.2A for the H package. 1.5 0.5 2.2 0.8 1.5 0.5 2.2 0.8 A A 0.24 0.15 0.5 0.25 0.15 0.1 0.4 0.17 A A % 0.6 1.5 0.6 0.3 1 0.3 0.003 12 2.3 3 1 0.003 15 3 5 12 2.3 3 % % 15 3 5 C/W C/W C/W Note 4: Testing is done using a pulsed low duty cycle technique. See thermal regulation specifications for output changes due to heating effects. Load regulation is measured on the output pin at a point 1/8" below the base of the K and H package and at the junction of the wide and narrow portion of the lead on the M and T package. Note 5: Load regulation for the LT337AT is the same as for LM337T. Note 6: Guaranteed on LT137A and LT337A, but not 100% tested in production. Note 7: ISC is tested at the ambient temperatures of 25C and -55C. ISC cannot be tested at the maximum ambient temperature of 150C due to the high power level required. ISC specification at 150C ambient is guaranteed by characterization and correlation to 25C testing. 137afb 4 LT137A/LM137 LT337A/LM337 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Temperature Stability 3.0 Minimum Load Current 1.270 1.8 Tj = 25C 1.8 Tj = 150C 1.4 Tj = -55C 1.4 1.260 CURRENT (mA) Tj = -55C 2.2 REFERENCE VOLTAGE (V) INPUT-OUTPUT DIFFERENTIAL 1.6 2.6 1.250 1.240 1.2 1.0 Tj = 25C 0.8 0.6 Tj = 150C 0.4 0.2 1.0 0.4 0.8 1.2 1.6 OUTPUT CURRENT (A) 2.0 1.230 -75 -50 -25 0 0 25 50 75 100 125 150 TEMPERATURE (C) 137A G01 Ripple Rejection CADJ = -10F CADJ = 0 40 |V - VOUT| = 5V 20 I IN L = 500mA f = 120Hz Tj = 25C 0 -10 -20 -30 0 OUTPUT VOLTAGE (V) -40 137A G04 Ripple Rejection 100 100 80 80 60 CADJ = 10F 40 CADJ = 0 V = -15V 20 VIN = -10V OUT IL = 500mA Tj = 25C 0 10 100 40 137A G03 Ripple Rejection RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) 60 10 20 30 INPUT-OUTPUT DIFFERENTIAL (V) 137A G02 100 80 0 RIPPLE REJECTION (dB) 0 1k 10k FREQUENCY (Hz) 100k 1M 137A G05 60 CADJ = 10F CADJ = 0 40 V = -15V 20 VIN = -10V OUT f = 120Hz Tj = 25C 0 0.1 1 0.01 OUTPUT CURRENT (A) 10 137A G06 137afb 5 LT137A/LM137 LT337A/LM337 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance Line Transient Response CADJ = 0 Load Transient Response 0.6 0.6 0.4 0.4 OUTPUT VOLTAGE DEVIATION (V) 0.8 CADJ = 0 0.2 0 CADJ = 10F -0.2 CADJ = 10F 10-3 10 100 1k 10k FREQUENCY (Hz) 100k 1M VOUT = -10V IL = 50mA CL = 1F Tj = 25C 0 -0.5 -1.0 0 10 20 TIME (s) 30 137A G07 -0.4 40 -1.0 -1.5 0 OUTPUT CURRENT (A) -0.2 10 20 TIME (s) 2 30 40 137A G09 Adjustment Current Tj = -55C Tj = 25C Tj = 150C 0.4 0 VIN = -15V VOUT = -10V INL = 50mA CL = 1F Tj = 25C 0 -0.5 Current Limit 3 0.2 CADJ = 10F 137A G08 Load Regulation* OUTPUT VOLTAGE DEVIATION (%) 0 -0.2 M, T AND K PACKAGES 1 H PACKAGE 80 ADJUSTMENT CURRENT (A) 10-2 CADJ = 0 0.2 -0.6 -0.4 LOAD CURRENT (A) 10-1 OUTPUT VOLTAGE DEVIATION (V) VIN = -15V VOUT = -10V IL = 500mA CL = 1F 100 Tj = 25C INPUT VOLTAGE CHANGE (V) OUTPUT IMPEDANCE () 101 75 70 65 60 55 -0.4 0 0.4 0.8 1.2 1.6 OUTPUT CURRENT (A) 2.0 137A G10 0 0 10 20 30 INPUT-OUTPUT DIFFERENTIAL (V) 40 137A G11 50 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 137A G12 *THE LT137A/LT337A HAS LOAD REGULATION COMPENSATION WHICH MAKES THE TYPICAL UNIT READ CLOSE TO ZERO. THIS BAND REPRESENTS THE TYPICAL PRODUCTION SPREAD. 137afb 6 LT137A/LM137 LT337A/LM337 APPLICATIONS INFORMATION Output Voltage EXAMPLES: The output voltage is determined by two external resistors, R1 and R2 (see Figure 1). The exact formula for the output voltage is: 1. A precision 10V regulator to supply up to 1A load current. R2 VOUT = VREF 1+ + IADJ (R2) R1 b. Calculate R2 = Where: VREF = Reference Voltage, IADJ = Adjustment Pin Current. In most applications, the second term is small enough to be ignored, typically about 0.5% of VOUT. In more critical applications, the exact formula should be used, with IADJ equal to 65A. Solving for R2 yields: R2 = VOUT - VREF VREF +I R1 ADJ The maximum value for the operating current, which must be absorbed, is 5mA for the LT137A. If input-output voltage differential is less than 10V, the operating current that must be absorbed drops to 3mA. + C1 10F R2 + IADJ C2 5F VREF ADJ -VIN VIN VOUT - VREF 10 V - 1.25V = = 696.4 VREF 1.25V + 65A + IADJ 100 R1 Use R2 = 698 2. A 15V regulator to run off batteries and supply 50mA. VIN MAX = 25V a. To minimize battery drain, select R1 as high as possible Smaller values of R1 and R2 will reduce the influence of IADJ on the output voltage, but the no-load current drain on the regulator will be increased. Typical values for R1 are between 100 and 300, giving 12.5mA and 4.2mA no-load current respectively. There is an additional consideration in selecting R1, the minimum load current specification of the regulator. The operating current of the LT137A flows from input to output. If this current is not absorbed by the load, the output of the regulator will rise above the regulated value. The current drawn by R1 and R2 is normally high enough to absorb the current, but care must be taken in no-load situations where R1 and R2 have high values. + a. Select R1 = 100 to minimize effect of IADJ LT137A VOUT 137A F01 Figure 1 C3 1F R1 -VOUT R1= 1.25V = 417, use 402, 1% 3mA b. The high value for R1 will exaggerate the error due to IADJ, so the exact formula to calculate R2 should be used. R2 = VOUT - VREF 15V - 1.25V = = 4331 VREF 1.25V + 65A +I R1 ADJ 402 Use R2 = 4320 Capacitors and Protection Diodes An output capacitor, C3, is required to provide proper frequency compensation of the regulator feedback loop. A 1F or larger solid tantalum capacitor is generally sufficient for this purpose if the 1MHz impedance of the capacitor is 2 or less. High Q capacitors, such as Mylar, are not recommended because they tend to reduce the phase margin at light load currents. Aluminum electrolytic capacitors may also be used, but the minimum value should be 10F to ensure a low impedance at 1MHz. The output capacitor should be located within a few inches of the regulator to keep lead impedance to a minimum. The following caution should be noted: if the output voltage is greater than 6V and an output capacitor greater than 20F has been used, it is possible to damage the regulator if the input voltage 137afb 7 LT137A/LM137 LT337A/LM337 APPLICATIONS INFORMATION becomes shorted, due to the output capacitor discharging into the regulator. This can be prevented by using the diode D1 (see Figure 2) between the input and the output. The input capacitor, C2, is only required if the regulator is more than 4 inches from the raw supply filter capacitor. Bypassing the Adjustment Pin The adjustment pin of the LT137A may be bypassed with a capacitor to ground, C1, to reduce output ripple, noise, and impedance. These parameters scale directly with output voltage if the adjustment pin is not bypassed. A bypass capacitor reduces ripple, noise, and impedance to that of a 1.25V regulator. In a 15V regulator, for example, these parameters are improved by 15V/1.25V = 12 to 1. This improvement holds only for those frequencies where the impedance of the bypass capacitor is less than R1. Ten microfarads is generally sufficient for 60Hz power line applications where the ripple frequency is 120Hz since XC = 130. The capacitor should have a voltage rating at least as high as the output voltage of the regulator. Values larger than 10F may be used, but if the output is larger than 25V, a diode, D2, should be added between the output and adjustment pins (see Figure 2). Proper Connection of Divider Resistors The LT137A has an excellent load regulation specification of 0.5% and is measured at a point 1/8" from the bottom of the package. To prevent degradation of load regulation, the resistors which set output voltage, R1 and R2, must be connected as shown in Figure 3. Note that the positive side of the load has a true force and sense (Kelvin) connection, but the negative side of the load does not. R1 should be connected directly to the output lead of the regulator, as close as possible to the specified point 1/8" from the case. R2 should be connected to the positive side of the load separately from the positive (ground) connection to the raw supply. With this arrangement, load regulation is degraded only by the resistance between the regulator output pin and the load. If R1 is connected to the load, regulation will be degraded. LEAD RESISTANCE HERE DOES NOT AFFECT LOAD REGULATION R2 LOAD R1 ADJ + -VIN R2 C1 LT137A VOUT 137A F03 + + C3 C2 R1 ADJ -VIN VIN VIN LT137A VOUT D2** 1N4002 -VOUT CONNECT R1 DIRECTLY TO REGULATOR PIN LEAD RESISTANCE HERE DEGRADES LOAD REGULATION. MINIMIZE THE LENGTH OF THIS LEAD. Figure 3 137A F02 D1* 1N4002 *D1 PROTECTS THE REGULATOR FROM INPUT SHORTS TO GROUND. IT IS REQUIRED ONLY WHEN C3 IS LARGER THAN 20F AND VOUT IS LARGER THAN 6V. **D2 PROTECTS THE ADJUST PIN OF THE REGULATOR FROM OUTPUT SHORTS IF C2 IS LARGER THAN 10F AND VOUT IS LARGER THAN -25V. Figure 2 137afb 8 LT137A/LM137 LT337A/LM337 TYPICAL APPLICATIONS A high stability regulator is illustrated in the application circuit shown to the right. The output stability, load regulation, line regulation, thermal regulation, temperature drift, long term drift, and noise can be improved by a factor of 6.6 over the standard regulator configuration. This assumes a zener whose drift and noise is considerably better than the regulator itself. The LM329B has 20ppm/C maximum drift and about 10 times lower noise than the regulator. In the application shown below, regulators #2 to "N" will track regulator #1 to within 24mV initially, and to 60mV over all load, line, and temperature conditions. If any regulator output is shorted to ground, all other outputs will drop to approximately -2V. Load regulation of regulators 2 to "N" will be improved by VOUT/1.25V compared to a standard regulator, so regulator #1 should be the one which has the lowest load current. High Stability Regulator 7V LM329B + R3 1.5k 1% VIN LT137A VOUT 137A TA03 +VIN VIN ADJ VIN -VIN R1** 100 1% REG #1 VOUT R4 5k 1% + C1 1F SOLID TANTALUM 10F ADJ -VIN + + 2F 1N4002 ADJ REG #2 VOUT VIN 1F SOLID TANTALUM + 2.2F* D1 1N4002 2.2F* D2 1N4002 + R5** 100 1% -VOUT1 137A TA02 - 908 R3 5k R2 R1 120 |VOUT| 9.08 * 10-3 +VOUT R2 5k 1% LT137A VIN *R2 = ADJ + 1N4002 -VOUT LT317A VOUT + 2F 1F SOLID TANTALUM Dual Tracking Supply 1.25V to 20V 10F + R1 1k 1% ADJ -VIN Multiple Tracking Regulators C3 10F R2* LT337A VOUT -VOUT 137A TA04 *SOLID TANTALUM **R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING -VOUT2 Current Regulator LT137A 137A TA02 + + 2F ADJ VIN + 1F SOLID TANTALUM ADJ (-) REG #N VOUT VIN LT337A VOUT 137A TA02 (+) RS -VOUT3 137A TA05 LT137A C1 1F SOLID TANTALUM I I = 65A + 1.25V RS (0.8 < RS < 250) 137afb 9 LT137A/LM137 LT337A/LM337 SCHEMATIC DIAGRAM ADJ 2k Q1 Q2 2k D4 Q3 20k Q4 15pF Q5 D1 Q6 D2 D3 750 100k 600 800 Q32 Q34 60k Q7 VOUT 5k 15pF 25pF 220 2k Q11 Q33 18k Q12 Q10 Q9 Q8 100k D5 20 20 Q13 Q25 Q26 4k 6.8k 12k 250 Q23 480 12k 5pF Q22 Q21 2pF 15k 12k Q20 Q18 Q24 Q19 150 1k Q14 Q27 Q28 Q31 Q30 270 Q16 100 0.02 2k Q17 8k 20k Q29 6k Q15 600 10 4.2k 4k 1k 100 1k 2.4k 500 VIN 137A SD 137afb 10 LT137A/LM137 LT337A/LM337 PACKAGE DESCRIPTION OBSOLETE PACKAGES H Package 3-Lead TO-39 Metal Can (Reference LTC DWG # 05-08-1330) .350 - .370 (8.890 - 9.398) .305 - .335 (7.747 - 8.509) .050 (1.270) MAX .165 - .185 (4.191 - 4.699) REFERENCE PLANE * .016 - .019** (0.406 - 0.483) DIA .500 (12.700) MIN .200 (5.080) TYP .100 (2.540) PIN 1 .029 - .045 (0.737 - 1.143) .100 (2.540) .028 - .034 (0.711 - 0.864) 45o H3(TO-39) 0801 *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND .050" BELOW THE REFERENCE PLANE .016 - .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610) K Package 2-Lead TO-3 Metal Can (Reference LTC DWG # 05-08-1310) .760 - .775 (19.30 - 19.69) .320 - .350 (8.13 - 8.89) .060 - .135 (1.524 - 3.429) .420 - .480 (10.67 - 12.19) .038 - .043 (0.965 - 1.09) 1.177 - 1.197 (29.90 - 30.40) .655 - .675 (16.64 - 17.15) .210 - .220 (5.33 - 5.59) .151 - .161 (3.86 - 4.09) DIA, 2PLCS .167 - .177 (4.24 - 4.49) R .425 - .435 (10.80 - 11.05) .067 - .077 (1.70 - 1.96) .490 - .510 (12.45 - 12.95) R K2 (TO-3) 0801 137afb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LT137A/LM137 LT337A/LM337 PACKAGE DESCRIPTION M Package 3-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1460) .060 (1.524) TYP .390 - .415 (9.906 - 10.541) .165 - .180 (4.191 - 4.572) 15 TYP .045 - .055 (1.143 - 1.397) .330 - .370 (8.382 - 9.398) .218 - .252 (5.537 - 6.401) .520 - .570 (13.208 - 14.478) .090 - .110 (2.286 - 2.794) .013 - .023 (0.330 - 0.584) .050 (1.270) TYP .028 - .038 (0.711 - 0.965) .095 - .115 (2.413 - 2.921) .420 .080 .420 .276 .325 .350 .205 .565 .565 .320 .090 .090 .100 BSC .070 TYP .100 BSC RECOMMENDED SOLDER PAD LAYOUT .070 TYP RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE M(DD3) (STRAIGHT) 0801 T Package 3-Lead Plastic TO-220 (Reference LTC DWG # 05-08-1420) .147 - .155 (3.734 - 3.937) DIA .390 - .415 (9.906 - 10.541) .165 - .180 (4.191 - 4.572) .045 - .055 (1.143 - 1.397) .230 - .270 (5.842 - 6.858) .460 - .500 (11.684 - 12.700) .570 - .620 (14.478 - 15.748) .330 - .370 (8.382 - 9.398) .980 - 1.070 (24.892 - 27.178) .520 - .570 (13.208 - 14.478) .100 (2.540) BSC .218 - .252 (5.537 - 6.401) .013 - .023 (0.330 - 0.584) .028 - .038 (0.711 - 0.965) .050 (1.270) TYP .095 - .115 (2.413 - 2.921) T3 (TO-220) 0801 137afb 12 Linear Technology Corporation LT 0807 REV B * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 1983