LT337AM

LT137A/LM137 LT337A/LM337 Negative Adjustable Regulator FEATURES n n n n n DESCRIPTION The LT®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%. 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. 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. 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 Adjustable Power Supplies System Power Supplies Precision Voltage/Current Regulators On-Card Regulators TYPICAL APPLICATION Negative Regulator 12 R2* C2 5μF SOLID TANTALUM VIN 11 C3 1μF SOLID TANTALUM R2 –VOUT = 1.25V 1 + R1 OUTPUT VOLTAGE ERROR (%) Output Voltage Error 1% RESISTORS 2% RESISTORS + + 10 9 8 7 6 5 4 3 2 1 0 1 2 4 6 8 10 20 40 OUTPUT VOLTAGE (V) 100 137A TA01b ADJ LT137A VOUT R1 121Ω LM337 –VIN LT337A 137A TA01 *R2 = R1 |VOUT| 1.25V –1 137afb 1 LT137A/LM137 LT337A/LM337 ABSOLUTE MAXIMUM RATINGS (Note 1) PRECONDITIONING 100% Thermal Limit Burn-In Power Dissipation .......................…….Internally Limited Input to Output Voltage Differential ..................…….40V Operating Junction Temperature Range LT137A/LM137 .................................. –55°C to 150°C LT337A/LM337 ...................................... 0°C to 125°C Storage Temperature Range LT137A/LM137 .................................. –65°C to 150°C LT337A/LM337 .................................. –65°C to 150°C Lead Temperature (Soldering, 10 sec.) ................. 300°C PIN CONFIGURATION BOTTOM VIEW VOUT 2 CASE IS VIN 1 ADJ K PACKAGE 2-LEAD TO-3 METAL CAN θJA = 35°C/W, θJC = 3°C/W Consider the M and T Packages for Alternate Source 3 1 2 VOUT BOTTOM VIEW ADJ CASE IS INPUT VIN H PACKAGE 3-LEAD TO-39 METAL CAN θJA = 150°C/W, θJC = 15°C/W Consider the M and T Packages for Alternate Source FRONT VIEW OBSOLETE PACKAGE FRONT VIEW 3 OBSOLETE PACKAGE TAB IS INPUT VOUT VIN ADJ TAB IS INPUT 3 2 1 VOUT VIN ADJ 2 1 M PACKAGE 3-LEAD PLASTIC DD θJA = 30°C/W, θJC = 3°C/W T PACKAGE 3-LEAD PLASTIC TO-220 θJA = 50°C/W, θJC = 4°C/W ORDER INFORMATION LEAD FREE FINISH LT337AM#PBF LT337AT#PBF LM337T#PBF LEAD BASED FINISH LT337AM LT337AT TAPE AND REEL LT337AM#TRPBF LT337AT#TRPBF LM337T#TRPBF TAPE AND REEL LT337AM#TR LT337AT#TR PART MARKING* LT337AM LT337AT LM337T PART MARKING* LT337AM LT337AT PACKAGE DESCRIPTION 3-Lead Plastic DD 3-Lead Plastic TO-220 3-Lead Plastic TO-220 PACKAGE DESCRIPTION 3-Lead Plastic DD 3-Lead Plastic TO-220 TEMPERATURE RANGE 0°C to 125°C 0°C to 125°C 0°C to 125°C TEMPERATURE RANGE 0°C to 125°C 0°C to 125°C 137afb 2 LT137A/LM137 LT337A/LM337 ORDER INFORMATION LEAD BASED FINISH LM337T TAPE AND REEL LM337T#TR PART MARKING LM337T PACKAGE DESCRIPTION 3-Lead Plastic TO-220 TEMPERATURE RANGE 0°C to 125°C 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/ The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 2, 3) LT137A SYMBOL PARAMETER VREF Reference Voltage CONDITIONS MIN l –1.220 ELECTRICAL CHARACTERISTICS LM137 MAX MIN TYP MAX UNITS V V TYP |VIN – VOUT| = 5V, IOUT = 10mA, Tj = 25°C 3V ≤ |VIN – VOUT| ≤ 40V 10mA ≤ IOUT ≤ IMAX, P ≤ PMAX 10mA ≤ IOUT ≤ IMAX, (Note 4) Tj = 25°C, |VOUT| ≤ 5V Tj = 25°C, |VOUT| ≥ 5V |VOUT| ≤ 5V –1.238 –1.250 –1.262 –1.225 –1.250 –1.275 –1.250 –1.280 –1.200 –1.250 –1.300 ΔVOUT ΔIOUT Load Regulation 5 0.1 l l 25 0.5 50 1 0.01 0.03 15 0.3 20 0.3 0.01 0.02 60 77 0.002 65 0.5 2 2.5 1.2 1.5 0.5 0.24 0.15 2.2 0.8 0.4 0.25 0.6 0.3 0.003 25 0.5 50 1 0.02 0.05 mV % mV % %/V %/V dB dB 10 0.2 0.005 0.01 60 70 66 80 0.002 ΔVOUT ΔVIN Line Regulation |VOUT| ≥ 5V 3V ≤ |VIN – VOUT| ≤ 40V (Note 4) Tj = 25°C VOUT = –10V, f = 120Hz CADJ = 0 CADJ = 10μF Tj = 25°C, 10ms Pulse l Ripple Rejection l l 66 0.02 100 2 5 5 3 Thermal Regulation IADJ ΔIADJ Adjust Pin Current Adjust Pin Current Change Minimum Load Current ISC Current Limit 0.02 100 5 5 5 3 %/W μA μA μA mA mA A A A A % 65 0.2 1 2.5 1.2 1.5 0.5 0.24 0.15 2.2 0.8 0.4 0.25 0.6 0.3 0.003 12 2.3 10mA ≤ IOUT ≤ IMAX 3V ≤ |VIN – VOUT| ≤ 40V l l l l l l |VIN – VOUT| ≤ 40V |VIN – VOUT| ≤ 10V |VIN – VOUT| ≤ 15V, K and T Package (Note 7) H Package |VIN – VOUT| = 40V, K and T Package Tj = 25°C H Package ΔVOUT ΔTemp ΔVOUT ΔTime en θJC Temperature Stability of Output Voltage (Note 6) Long Term Stability RMS Output Noise (% of VOUT) Thermal Resistance Junction to Case TMIN ≤ T ≤ TMAX TA = 125°C, 1000 Hours TA = 25°C, 10Hz ≤ f ≤ 10kHz H Package K Package l 1.5 1 1 % % 15 3 12 2.3 15 3 °C/W °C/W 137afb 3 LT137A/LM137 LT337A/LM337 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VREF Reference Voltage CONDITIONS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 2, 3) LT337A MIN l –1.220 LM337 MAX MIN TYP MAX UNITS V V TYP |VIN – VOUT| = 5V, IOUT = 10mA, Tj = 25°C 3V ≤ |VIN – VOUT| ≤ 40V 10mA ≤ IOUT ≤ IMAX, P ≤ PMAX 10mA ≤ IOUT ≤ IMAX, (Notes 4 and 5) Tj = 25°C, |VOUT| ≤ 5V Tj = 25°C, |VOUT| ≥ 5V |VOUT| ≤ 5V –1.238 –1.250 –1.262 –1.213 –1.250 –1.287 –1.250 –1.280 –1.200 –1.250 –1.300 ΔVOUT ΔIOUT Load Regulation 5 0.1 l l 25 0.5 50 1 0.01 0.03 15 0.3 20 0.3 0.01 0.02 60 77 0.003 65 0.5 2 2.5 1 1.5 0.5 0.15 0.1 2.2 0.8 0.4 0.17 0.6 0.3 0.003 50 1 70 1.5 0.04 0.07 mV % mV % %/V %/V dB dB 10 0.2 0.005 0.01 60 70 66 80 0.002 ΔVOUT ΔVIN Line Regulation |VOUT| ≥ 5V 3V ≤ |VIN – VOUT| ≤ 40V (Note 4) Tj = 25°C VOUT = –10V, f = 120Hz CADJ = 0 CADJ = 10μF Tj = 25°C, 10ms Pulse l Ripple Rejection l l 66 0.02 100 2 5 5 3 Thermal Regulation IADJ ΔIADJ Adjust Pin Current Adjust Pin Current Change Minimum Load Current ISC Current Limit 0.04 100 5 5 10 6 %/W μA μA μA mA mA A A A A % 65 0.2 1 2.5 1.2 1.5 0.5 0.24 0.15 2.2 0.8 0.5 0.25 0.6 0.3 0.003 12 2.3 3 10mA ≤ IOUT ≤ IMAX 3V ≤ |VIN – VOUT| ≤ 40V l l l l l l |VIN – VOUT| ≤ 40V |VIN – VOUT| ≤ 10V |VIN – VOUT| ≤ 15V, K, M and T Package H Package |VIN – VOUT| = 40V, K, M and T Package Tj = 25°C H Package ΔVOUT ΔTemp ΔVOUT ΔTime en θJC Temperature Stability of Output Voltage (Note 6) Long Term Stability RMS Output Noise (% of VOUT) Thermal Resistance Junction to Case TA = 125°C, 1000 Hours TA = 25°C, 10Hz ≤ f ≤ 10kHz H Package K Package M and T Package l 1.5 1 1 % % 15 3 5 12 2.3 3 15 3 5 °C/W °C/W °C/W 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. 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 25°C and –55°C. ISC cannot be tested at the maximum ambient temperature of 150°C due to the high power level required. ISC specification at 150°C ambient is guaranteed by characterization and correlation to 25°C testing. 137afb 4 LT137A/LM137 LT337A/LM337 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage 3.0 1.270 Temperature Stability 1.8 1.6 Minimum Load Current Tj = –55°C INPUT-OUTPUT DIFFERENTIAL REFERENCE VOLTAGE (V) 2.6 Tj = –55°C 2.2 Tj = 25°C 1.260 CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 Tj = 150°C Tj = 25°C 1.250 1.8 Tj = 150°C 1.4 1.240 1.0 0 0.4 0.8 1.2 1.6 OUTPUT CURRENT (A) 2.0 137A G01 1.230 –75 –50 –25 0 0 25 50 75 100 125 150 TEMPERATURE (°C) 137A G02 0 10 20 30 INPUT-OUTPUT DIFFERENTIAL (V) 40 137A G03 Ripple Rejection 100 CADJ = –10μF RIPPLE REJECTION (dB) 100 Ripple Rejection 100 Ripple Rejection 80 RIPPLE REJECTION (dB) 80 RIPPLE REJECTION (dB) 80 CADJ = 10μF 60 CADJ = 0 60 CADJ = 10μF 40 CADJ = 0 60 CADJ = 0 40 |V – VOUT| = 5V 20 I IN 500mA L= f = 120Hz Tj = 25°C 0 –10 –20 –30 0 OUTPUT VOLTAGE (V) 40 V = –15V 20 VIN = –10V OUT f = 120Hz Tj = 25°C 0 0.1 1 0.01 OUTPUT CURRENT (A) –40 137A G04 V = –15V 20 VIN = –10V OUT IL = 500mA Tj = 25°C 0 10 100 1k 10k FREQUENCY (Hz) 100k 1M 137A G05 10 137A G06 137afb 5 LT137A/LM137 LT337A/LM337 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance 101 OUTPUT VOLTAGE DEVIATION (V) VIN = –15V VOUT = –10V IL = 500mA CL = 1μF 100 Tj = 25°C 0.8 OUTPUT VOLTAGE DEVIATION (V) 0.6 0.4 0.2 0 –0.2 –0.4 INPUT VOLTAGE CHANGE (V) 10–2 CADJ = 10μF 0 –0.5 –1.0 0 10 20 TIME (μs) 30 40 137A G08 Line Transient Response 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 LOAD CURRENT (A) VOUT = –10V IL = 50mA CL = 1μF Tj = 25°C 0 –0.5 –1.0 –1.5 Load Transient Response CADJ = 0 OUTPUT IMPEDANCE (Ω) CADJ = 0 CADJ = 10μF 10–1 CADJ = 0 CADJ = 10μF VIN = –15V VOUT = –10V INL = 50mA CL = 1μF Tj = 25°C 0 10 20 TIME (μs) 30 40 137A G09 10–3 10 100 1k 10k FREQUENCY (Hz) 100k 1M 137A G07 Load Regulation* 3 OUTPUT VOLTAGE DEVIATION (%) 0.4 OUTPUT CURRENT (A) Current Limit Tj = –55°C Tj = 25°C Tj = 150°C 80 75 70 65 60 55 Adjustment Current 0.2 2 0 M, T AND K PACKAGES –0.2 1 H PACKAGE –0.4 0 0.4 0.8 1.2 1.6 OUTPUT CURRENT (A) 2.0 137A G10 ADJUSTMENT CURRENT (μA) 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 The output voltage is determined by two external resistors, R1 and R2 (see Figure 1). The exact formula for the output voltage is: ⎛ R2 ⎞ VOUT = VREF ⎜ 1+ ⎟ + IADJ (R2) ⎝ R1⎠ 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 65μA. Solving for R2 yields: R2 = VOUT – VREF VREF +I R1 ADJ EXAMPLES: 1. A precision 10V regulator to supply up to 1A load current. a. Select R1 = 100Ω to minimize effect of IADJ b. Calculate R2 = VOUT – VREF 10 V – 1.25V = = 696.4Ω VREF 1.25V + 65μA + IADJ 100Ω R1 Use R2 = 698Ω 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 R1= 1.25V = 417Ω, use 402Ω, 1% 3mA 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 100Ω and 300Ω, 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. 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. + + C2 5μF ADJ –VIN VIN LT137A VOUT C1 10μF IADJ R2 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 = = 4331Ω VREF 1.25V + 65μA +I R1 ADJ 402Ω Use R2 = 4320Ω Capacitors and Protection Diodes An output capacitor, C3, is required to provide proper frequency compensation of the regulator feedback loop. A 1μF or larger solid tantalum capacitor is generally sufficient for this purpose if the 1MHz impedance of the capacitor is 2Ω 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 10μF 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 20μF has been used, it is possible to damage the regulator if the input voltage 137afb + R1 C3 1μF VREF –VOUT 137A F01 Figure 1 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 = 130Ω. The capacitor should have a voltage rating at least as high as the output voltage of the regulator. Values larger than 10μF 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). + C1 R2 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 VIN LT137A VOUT 137A F03 + C2 R1 ADJ –VIN VIN LT137A VOUT + C3 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 20μF AND VOUT IS LARGER THAN 6V. **D2 PROTECTS THE ADJUST PIN OF THE REGULATOR FROM OUTPUT SHORTS IF C2 IS LARGER THAN 10μF 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. Multiple Tracking Regulators 10μF C3 10μF 2μF ADJ –VIN VIN LT137A 137A TA02 High Stability Regulator 7V LM329B R3 1.5k 1% ADJ –VIN VIN LT137A VOUT *R2 = –VOUT R2* + R1 1k 1% 1μF SOLID TANTALUM |VOUT| 9.08 • 10–3 137A TA03 – 908Ω Dual Tracking Supply ±1.25V to ±20V +VIN VIN LT317A VOUT ADJ R1** 100Ω 1% +VOUT + 2.2μF* + R2 C1 1μF SOLID TANTALUM –VOUT1 D1 1N4002 + + 10μF R2 5k 1% R4 5k 1% R3 5k + 1N4002 R1 120Ω + R5** 100Ω 1% 2.2μF* D2 1N4002 REG #1 VOUT ADJ –VIN VIN LT337A VOUT –VOUT + 2μF ADJ VIN LT137A 137A TA02 + 1N4002 1μF SOLID TANTALUM 137A TA04 *SOLID TANTALUM **R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING REG #2 VOUT –VOUT2 Current Regulator + + ADJ (–) –VOUT3 137A TA05 + 2μF ADJ VIN LT137A 137A TA02 1μF SOLID TANTALUM VIN C1 1μF SOLID TANTALUM (+) RS I I = 65μA + 1.25V RS LT337A VOUT REG #N VOUT (0.8Ω < RS < 250Ω) 137afb 9 LT137A/LM137 LT337A/LM337 SCHEMATIC DIAGRAM ADJ 2k Q1 2k Q3 Q4 Q5 D1 Q6 750Ω Q7 60k 100k 18k Q8 100k 600Ω Q33 Q10 Q9 Q12 D2 D3 800Ω 5k 15pF 2k Q11 25pF 20k 15pF Q2 D4 VOUT Q32 Q34 220Ω D5 20Ω 20Ω Q13 4k 6.8k Q23 480Ω 5pF Q21 12k Q18 Q19 1k Q14 270Ω Q16 Q15 600Ω 4.2k 4k 2k Q17 8k 20k 6k 1k 1k Q29 Q27 Q28 Q31 150Ω Q20 Q24 Q22 15k 2pF 12k Q25 Q26 250Ω 12k 10Ω Q30 100Ω 0.02Ω 100Ω 2.4k 500Ω 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 REFERENCE PLANE .165 – .185 (4.191 – 4.699) * .016 – .019** (0.406 – 0.483) DIA .200 (5.080) TYP .500 (12.700) MIN .100 (2.540) PIN 1 .029 – .045 (0.737 – 1.143) .028 – .034 (0.711 – 0.864) .100 (2.540) 45 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) .320 – .350 (8.13 – 8.89) .760 – .775 (19.30 – 19.69) .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 .067 – .077 (1.70 – 1.96) .490 – .510 (12.45 – 12.95) R .425 – .435 (10.80 – 11.05) 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) 15° TYP .165 – .180 (4.191 – 4.572) .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) .028 – .038 (0.711 – 0.965) .050 (1.270) TYP .013 – .023 (0.330 – 0.584) .095 – .115 (2.413 – 2.921) .420 .420 .080 .276 .350 .205 .565 .325 .565 .320 .090 .100 BSC .070 TYP .100 BSC .090 .070 TYP RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS M(DD3) (STRAIGHT) 0801 T Package 3-Lead Plastic TO-220 (Reference LTC DWG # 05-08-1420) .390 – .415 (9.906 – 10.541) .147 – .155 (3.734 – 3.937) DIA .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .330 – .370 (8.382 – 9.398) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) .980 – 1.070 (24.892 – 27.178) .520 – .570 (13.208 – 14.478) .218 – .252 (5.537 – 6.401) .013 – .023 (0.330 – 0.584) .100 (2.540) BSC .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 (408) 432-1900 ● LT 0807 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1983