LT337AT

LT137A_1 LINER | Alldatasheet

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DESCRIPTION

The L T®137A/L T337A 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 signifi cant 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 diffi cult 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 fi eld failures experienced with other regulators that receive only standard electrical testing. Negative Regulator n Guaranteed 1% Initial Voltage Tolerance n Guaranteed 0.01%/V Line Regulation n Guaranteed 0.5% Load Regulation n Guaranteed 0.02%/W Thermal Regulation n 100% Burn-in in Thermal Limit n Adjustable Power Supplies n System Power Supplies n Precision Voltage/Current Regulators n On-Card Regulators L, L T , L TC and L TM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Output Voltage Error L T137A ADJ VIN–VIN R2* *R2 = R1 VOUT –VOUT = 1.25V 1 + R2 137A TA01 121Ω 1μF SOLID TANTALUM + C2 5μF SOLID TANTALUM – 1 |VOUT| 1.25V OUTPUT VOLTAGE (V) 12 4 6 8 2 0 4 0 OUTPUT VOLTAGE ERROR (%) 10 100 137A TA01b LM337 LT337A 1% RESISTORS 2% RESISTORS

PRECONDITIONING ABSOLUTE MAXIMUM RATINGS Operating Junction Temperature Range Storage Temperature Range (Note 1) VOUT CASE IS VIN ADJ K PACKAGE 2-LEAD TO-3 METAL CAN BOTTOM VIEW θJA = 35°C/W , θJC = 3°C/W OBSOLETE PACKAGE Consider the M and T Packages for Alternate Source BOTTOM VIEW CASE IS INPUT VOUT VIN ADJ H PACKAGE 3-LEAD TO-39 METAL CAN θJA = 150°C/W , θJC = 15°C/W OBSOLETE PACKAGE Consider the M and T Packages for Alternate Source M PACKAGE 3-LEAD PLASTIC DD FRONT VIEW TAB IS INPUT VOUT VIN ADJ θJA = 30°C/W , θJC = 3°C/W TAB IS INPUT T PACKAGE 3-LEAD PLASTIC TO-220 VOUT VIN ADJ FRONT VIEW θJA = 50°C/W , θJC = 4°C/W PIN CONFIGURATION ORDER INFORMATION 100% Thermal Limit Burn-In LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L T337AM#PBF L T337AM#TRPBF L T337AM 3-Lead Plastic DD 0°C to 125°C L T337AT#PBF L T337AT#TRPBF L T337AT 3-Lead Plastic TO-220 0°C to 125°C LM337T#PBF LM337T#TRPBF LM337T 3-Lead Plastic TO-220 0°C to 125°C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L T337AM L T337AM#TR L T337AM 3-Lead Plastic DD 0°C to 125°C L T337AT L T337AT#TR L T337AT 3-Lead Plastic TO-220 0°C to 125°C

The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. (Notes 2, 3) SYMBOL PARAM ETER CONDITIONS L T137A LM137 UNITSMIN TYP MAX MIN TYP MAX 10mA ≤ IOUT ≤ IMAX, P ≤ PMAX ΔVOUT ΔIOUT Load Regulation 10mA ≤ IOUT ≤ IMAX, (Note 4) T j = 25°C, |VOUT| ≤ 5V T j = 25°C, |VOUT| ≥ 5V |VOUT| ≤ 5V |VOUT| ≥ 5V l l 0.1 0.2 0.5 0.3 0.3 0.5 mV mV ΔVOUT ΔVIN Line Regulation 3V ≤ |VIN – VOUT| ≤ 40V (Note 4) T j = 25°C l 0.005 0.01 0.01 0.03 0.01 0.02 0.02 0.05 %/V %/V Ripple Rejection V OUT = –10V , f = 120Hz C ADJ = 0 C ADJ = 10μF l 80 66 dB dB Thermal Regulation T j = 25°C, 10ms Pulse 0.002 0.02 0.002 0.02 %/W IADJ Adjust Pin Current l 65 100 65 100 μA ΔIADJ Adjust Pin Current Change 10mA ≤ I OUT ≤ IMAX l l 0.2 0.5 μA μA Minimum Load Current |VIN – VOUT| ≤ 40V |VIN – VOUT| ≤ 10V l l 2.5 1.2 2.5 1.2 mA mA I SC Current Limit |VIN – VOUT| ≤ 15V , K and T Package (Note 7) H Package |VIN – VOUT| = 40V , K and T Package T j = 25°C H Package l l 1.5 0.5 0.24 0.15 2.2 0.8 0.4 0.25 1.5 0.5 0.24 0.15 2.2 0.8 0.4 0.25 A A A A ΔV OUT ΔTemp Temperature Stability of Output Voltage (Note 6) T MIN ≤ T ≤ TMAX l 0.6 1.5 0.6 % ΔVOUT ΔTime Long Term Stability T A = 125°C, 1000 Hours 0.3 1 0.3 1 % en RMS Output Noise (% of V OUT) TA = 25°C, 10Hz ≤ f ≤ 10kHz 0.003 0.003 % θJC Thermal Resistance Junction to Case H Package K Package 2.3 2.3 °C/W °C/W

ELECTRICAL CHARACTERISTICS

LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LM337T LM337T#TR LM337T 3-Lead Plastic TO-220 0°C to 125°C Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container . Consult L TC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/

ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. (Notes 2, 3) SYMBOL PARAM ETER CONDITIONS L T337A LM337 UNITSMIN TYP MAX MIN TYP MAX 10mA ≤ IOUT ≤ IMAX, P ≤ PMAX ΔVOUT ΔIOUT Load Regulation 10mA ≤ I OUT ≤ IMAX, (Notes 4 and 5) T j = 25°C, |VOUT| ≤ 5V T j = 25°C, |VOUT| ≥ 5V |VOUT| ≤ 5V |VOUT| ≥ 5V l l 0.1 0.2 0.5 0.3 0.3 1.5 mV mV ΔVOUT ΔVIN Line Regulation 3V ≤ |VIN – VOUT| ≤ 40V (Note 4) T j = 25°C l 0.005 0.01 0.01 0.03 0.01 0.02 0.04 0.07 %/V %/V Ripple Rejection V OUT = –10V , f = 120Hz C ADJ = 0 C ADJ = 10μF l 80 66 dB dB Thermal Regulation T j = 25°C, 10ms Pulse 0.002 0.02 0.003 0.04 %/W IADJ Adjust Pin Current l 65 100 65 100 μA ΔIADJ Adjust Pin Current Change 10mA ≤ I OUT ≤ IMAX l l 0.2 0.5 μA μA Minimum Load Current |VIN – VOUT| ≤ 40V |VIN – VOUT| ≤ 10V l l 2.5 1.2 2.5 mA mA ISC Current Limit |VIN – VOUT| ≤ 15V , K, M and T Package H Package |VIN – VOUT| = 40V , K, M and T Package T j = 25°C H Package l l 1.5 0.5 0.24 0.15 2.2 0.8 0.5 0.25 1.5 0.5 0.15 0.1 2.2 0.8 0.4 0.17 A A A A ΔVOUT ΔTemp Temperature Stability of Output Voltage (Note 6) l 0.6 1.5 0.6 % ΔVOUT ΔTime Long Term Stability T A = 125°C, 1000 Hours 0.3 1 0.3 1 % en RMS Output Noise (% of VOUT) TA = 25°C, 10Hz ≤ f ≤ 10kHz 0.003 0.003 % θJC Thermal Resistance Junction to Case H Package K Package M and T Package 2.3 2.3 °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 specifi cations indicate those parameters which have been improved or guaranteed test limits provided for the fi rst time. Note 3: Unless otherwise indicated, these specifi cations 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 specifi cations apply for power dissipation up to 2W for the H package and 20W for the K and T packages. I MAX = 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 specifi cations 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 L T337AT is the same as for LM337T . Note 6: Guaranteed on L T137A and L T337A, but not 100% tested in production. Note 7: I SC 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. I SC specifi cation at 150°C ambient is guaranteed by characterization and correlation to 25°C testing.

OUTPUT CURRENT (A) 0.01 RIPPLE REJECTION (dB) 100 137A G06 0.1 1 10 CADJ = 10μF VIN = –15V VOUT = –10V f = 120Hz T j = 25°C CADJ = 0 FREQUENCY (Hz) 10 100 RIPPLE REJECTION (dB) 100 137A G05 1k 10k 100k 1M CADJ = 10μF VIN = –15V VOUT = –10V IL = 500mA Tj = 25°C CADJ = 0 OUTPUT VOLTAGE (V) RIPPLE REJECTION (dB) 100 137A G04 –10 –20 –30 –40 CADJ = –10μF |VIN – VOUT| = 5V IL = 500mA f = 120Hz T j = 25°C CADJ = 0 TEMPERATURE (°C) –75 75 –25 REFERENCE VOLTAGE (V) 1.270 1.260 1.250 1.240 1.230 137A G02 –50 25 50 0 150 100 125 OUTPUT CURRENT (A) INPUT-OUTPUT DIFFERENTIAL 3.0 2.6 2.2 1.8 1.4 1.0 1.6 137A G01 0.4 0.8 1.2 2.0 Tj = –55°C Tj = 25°C Tj = 150°C TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Temperature Stability Minimum Load Current Ripple Rejection Ripple Rejection Ripple Rejection INPUT-OUTPUT DIFFERENTIAL (V) CURRENT (mA) 1.8 1.6 1.2 1.4 0.8 0.6 0.2 0.4 1.0 137A G03 40302010 Tj = –55°C Tj = 150°C Tj = 25°C

TEMPERATURE (°C) –75 75 –25 ADJUSTMENT CURRENT (μA) 137A G12 –50 25 50 0 150 100 125 OUTPUT CURRENT (A) *THE LT137A/LT337A HAS LOAD REGULATION COMPENSATION WHICH MAKES THE TYPICAL UNIT READ CLOSE TO ZERO. THIS BAND REPRESENTS THE TYPICAL PRODUCTION SPREAD. OUTPUT VOLTAGE DEVIATION (%) 1.6 137A G10 0.4 0.8 1.2 2.0 0.4 0.2 –0.2 –0.4 INPUT-OUTPUT DIFFERENTIAL (V) OUTPUT CURRENT (A) 137A G11 40302010 H PACKAGE M, T AND K PACKAGES Tj = –55°C Tj = 25°C Tj = 150°C TIME (μs) OUTPUT VOLTAGE DEVIATION (V) INPUT VOLTAGE CHANGE (V) 0.8 0.6 0.4 0.2 –0.4 –0.5 –0.2 –1.0 137A G08 03 0 20 40 CADJ = 10μF VOUT = –10V IL = 50mA CL = 1μF Tj = 25°C CADJ = 0 FREQUENCY (Hz) 10 100 OUTPUT IMPEDANCE (Ω) 101 100 10–1 10–2 10–3 137A G07 1k 10k 100k 1M CADJ = 10μF VIN = –15V VOUT = –10V IL = 500mA CL = 1μF Tj = 25°C CADJ = 0 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance Line T ransient Response Load T ransient Response Load Regulation* Current Limit Adjustment Current TIME (μs) OUTPUT VOLTAGE DEVIATION (V)LOAD CURRENT (A) 0.6 0.4 0.2 –0.6 –0.4 –0.5 –0.2 –1.5 –1.0 137A G09 03 0 20 40 CADJ = 0 VIN = –15V VOUT = –10V INL = 50mA CL = 1μF Tj = 25°C CADJ = 10μF

The output voltage is determined by two external resis- tors, R1 and R2 (see Figure 1). The exact formula for the output voltage is: VV R R IROUT REF ADJ=+ ⎛ ⎠⎟ + ()1 2 1 2 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 V OUT. In more critical applications, the exact formula should be used, with I ADJ equal to 65μA. Solving for R2 yields: R VV V R I OUT REF REF ADJ Smaller values of R1 and R2 will reduce the infl uence of I ADJ 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 specifi cation of the regulator . The operating current of the L T137A fl ows 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 L T137A. If input-output volt- age differential is less than 10V , the operating current that must be absorbed drops to 3mA. APPLICATIONS INFORMATION EXAMPLES: 1. A precision 10V regulator to supply up to 1A load current. a. Select R1 = 100Ω to minimize effect of I ADJ b. Calculate R2 = VV V R I VV V μ OUT REF REF ADJ – –. 10 1 25 12 5 100 65+ +Ω AA = 696 4. Ω 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 R V mA1 12 5 3 417== . ΩΩ,u s e4 0 2 ,1 % b. The high value for R1 will exaggerate the error due to IADJ, so the exact formula to calculate R2 should be used. R VV V R I VV V OUT REF REF ADJ 15 1 25 12 5 402 – –. Ω 665 4331 μA Use R2 = 4320Ω Capacitors and Protection Diodes An output capacitor , C3, is required to provide proper fre- quency compensation of the regulator feedback loop. A 1μF or larger solid tantalum capacitor is generally suffi cient for this purpose if the 1MHz impedance of the capacitor is 2Ω or less. High Q capacitors, such as Mylar , are not recom- mended 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 Figure 1 L T137A ADJ IADJ VIN–VIN VOUT VREF –VOUT 137A F01 1μF + C2 5μF + C1 10μF

A high stability regulator is illustrated in the application circuit shown to the right. The output stability, load regula- tion, line regulation, thermal regulation, temperature drift, long term drift, and noise can be improved by a factor of 6.6 over the standard regulator confi guration. 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 regula- tors 2 to “N” will be improved by V OUT/1.25V compared to a standard regulator , so regulator #1 should be the one which has the lowest load current. Multiple T racking Regulators High Stability Regulator Dual T racking Supply ±1.25V to ±20V Current Regulator L T137A ADJ VIN–VIN R2*7V LM329B VOUT –VOUT 137A TA03 1.5k + 1μF SOLID TANTALUM *R2 = – 908Ω |VOUT| 9.08 • 10–3 L T337A ADJ VIN(–) V OUT (+) 137A TA05 RS I + C1 1μF SOLID TANTALUM I = 65μA + (0.8Ω < R S < 250Ω) 1.25V RS L T337A ADJ VIN–VIN *SOLID TANTALUM R1 OR R5 MAY BE TRIMMED SLIGHTL Y TO IMPROVE TRACKING 1N4002 VOUT –VOUT 137A TA04 R5 100Ω L T317A ADJ VIN+VIN VOUT +VOUT 2.2μF* 10μF 10μF R1** 100Ω 1N4002 2.2μF* REG #1 ADJ VIN –VIN VOUT –VOUT1 137A TA02 120Ω1N4002 1μF SOLID TANTALUM +C3 10μF 2μF REG #2 L T137A L T137A ADJ VIN VOUT –VOUT2 137A TA02 1N4002 1μF SOLID TANTALUM 2μF REG #N L T137A ADJ VIN VOUT –VOUT3 137A TA02 1μF SOLID TANTALUM 2μF

0.02Ω VOUT 137A SD 250Ω Q26 Q25 100Ω 100Ω 12k 12k 10Ω Q22 480Ω 2pF 5pF Q12 Q11 Q30 Q29 220Ω 500Ω2.4k Q31 Q27 Q34 Q23 6.8k 150Ω 15k Q24 20kQ4 20Ω 800Ω 600Ω 18k 100k 25pF 15pF D3D2 ADJ Q10 Q33 Q32 20Ω 15pF 100k 60k 750Ω Q6 Q7 Q21 Q20 Q19 Q17 Q15 20k 12k 600Ω 4k 270Ω 4.2k Q13 Q14 Q18

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. PACKAGE DESCRIPTION .016 – .019** (0.406 – 0.483) DIA .050 (1.270) MAX .165 – .185 (4.191 – 4.699) .500 (12.700) MIN .305 – .335 (7.747 – 8.509) .350 – .370 (8.890 – 9.398) .200 (5.080) TYP 45o H3(TO-39) 0801 .100 (2.540) .100 (2.540) .029 – .045 (0.737 – 1.143) .028 – .034 (0.711 – 0.864) REFERENCE PLANE * LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND .050" BELOW THE REFERENCE PLANE FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS .016 – .024 (0.406 – 0.610) PIN 1 K2 (TO-3) 0801 .038 – .043 (0.965 – 1.09) .060 – .135 (1.524 – 3.429) .320 – .350 (8.13 – 8.89) .420 – .480 (10.67 – 12.19) .760 – .775 (19.30 – 19.69) .490 – .510 (12.45 – 12.95) R .167 – .177 (4.24 – 4.49) R .151 – .161 (3.86 – 4.09) DIA, 2PLCS 1.177 – 1.197 (29.90 – 30.40) .655 – .675 (16.64 – 17.15) .067 – .077 (1.70 – 1.96) .210 – .220 (5.33 – 5.59) .425 – .435 (10.80 – 11.05) H Package 3-Lead TO-39 Metal Can (Reference L TC DWG # 05-08-1330) K Package 2-Lead TO-3 Metal Can (Reference L TC DWG # 05-08-1310) OBSOLETE PACKAGES

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 1983 LT 0807 REV B • PRINTED IN USA M(DD3) (STRAIGHT) 0801 .045 – .055 (1.143 – 1.397) .165 – .180 (4.191 – 4.572) .050 (1.270) TYP .090 – .110 (2.286 – 2.794) .013 – .023 (0.330 – 0.584) .095 – .115 (0.711 – 0.965) .520 – .570 (13.208 – 14.478) .218 – .252 (5.537 – 6.401) .330 – .370 (8.382 – 9.398) .060 (1.524) TYP .390 – .415 (9.906 – 10.541) 15° TYP .420 .350 .565 .090 .070 TYP.100 BSC .420 .276 .325 .205 .080 .565 .090 .070 TYP.100 BSC RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE .320 .100 (2.540) BSC .028 – .038 (0.711 – 0.965) T3 (TO-220) 0801 .045 – .055 (1.143 – 1.397) .165 – .180 (4.191 – 4.572) .095 – .115 (2.413 – 2.921) .013 – .023 (0.330 – 0.584) .520 – .570 (13.208 – 14.478) .980 – 1.070 (24.892 – 27.178) .218 – .252 (5.537 – 6.401) .050 (1.270) TYP .147 – .155 (3.734 – 3.937) DIA .390 – .415 (9.906 – 10.541) .330 – .370 (8.382 – 9.398) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .230 – .270 (5.842 – 6.858) M Package 3-Lead Plastic DD Pak (Reference L TC DWG # 05-08-1460) PACKAGE DESCRIPTION T Package 3-Lead Plastic TO-220 (Reference L TC DWG # 05-08-1420)