THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS OUTPUT VOLT
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LM137/LM237 LM337
THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS
OUTPUT VOLTAGE ADJUSTABLE DOWN Vref 1.5A GUARANTEED OUTPUT CURRENT 0.3%/V TYPICAL LOAD REGULATION 0.01%/V TYPICAL LINE REGULATION CURRENT LIMIT CONSTANT WITH TEMPERATURE RIPPLE REJECTION: 77dB STANDARD 3-LEAD TRANSISTOR PACKAGES EXCELLENT THERMAL REGULATION: 0.002%/V 50ppm/°C TEMPERATURE COEFFICIENT
TO-220
DESCRIPTION LM137 series adjustable 3-terminal negative voltage regulators capable supplying excess -1.5A over -1.2 -37V output voltage range.They exceptionally easy require only external resistors output voltage. Further, both line load regulation better than standard fixed regulators. Also, LM137 regulators supplied standard transistor packages which easily mounted handled. addition higher performance than fixed regulators, LM137 series offer full overload protection available only integrated circuits. Figure Schematic Diagram
TO-3
Included chip current limit, thermal overload protection safe area protection. overload protection circuitry remains fully functional even adjustment terminal disconnected
January 2005
Rev.
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LM137-LM237-LM337
Table Absolute Maximum RatingSymbol Ptot Tstg Toper Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range LM137 LM237 LM337 Parameter Input Output Voltage Differential Value Internally Limited Unit
Absolute Maximum Ratings those values beyond which damage device occur. Functional operation under these condition implied.
Table Thermal Data
Symbol Rthj-case Rthj-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient TO-220 TO-3 Unit °C/W °C/W
Figure Connection (Top view TO-220, bottom view TO-3)
TO-220
TO-3 Table Ordering CodeTYPE LM137 LM237 LM337 TO-3 LM137K LM237K LM337K TEMPERATURE RANGE -55°C 150°C -25°C 150°C 125°C
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Table Electrical Characteristics LM137/LM237 150°C LM137, 150°C LM237, unless otherwise specified).
Symbol Vref Parameter Reference Voltage 25°C |IO| 10mA |IO(max)| Line Regulation (Note Load Regulation (Note Thermal Regulation Iadj Iadj Adjustment Current Adjustment Current Change Line Regulation (Note Load Regulation (Note 25°C, |IO| |IO(max)| |IO| 10mA |IO(max)| Short Circuit Output Current Output Noise Ripple Rejection Ratio Temperature Stability Long Term Stability 125°C, 1000 25°C Cadj 0.24 |VO| |VO| |IO(min)| Minimum Load Current 25°C 25°C |IO| 10mA |IO(max)| 25°C, pulse Tmin Tmax Pmax |VO| |VO| Test Conditions Min. -1.225 -1.2 Typ. -1.25 -1.25 0.01 0.01 0.002 0.02 0.003 Max. -1.275 -1.3 0.02 0.02 0.02 0.05 Unit
Notes: Although power dissipation internally limited, these specifications applicable power dissipation TO-220 TO-3 Package; IO(max) Regulation measured constant junction temperature, using pulse testing with duty cycle. Changes output voltage heating effects covered under specification thermal regulation.
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Table Electrical Characteristics LM337 150°C unless otherwise specified).
Symbol Vref Parameter Reference Voltage 25°C |IO| 10mA |IO(max)| Line Regulation (Note Load Regulation (Note Thermal Regulation Iadj Iadj Adjustment Current Adjustment Current Change Line Regulation (Note Load Regulation (Note 25°C, |IO| |IO(max)| |IO| 10mA |IO(max)| Short Circuit Output Current Output Noise Ripple Rejection Ratio Temperature Stability Long Term Stability 125°C, 1000 25°C Cadj 0.15 |VO| |VO| |IO(min)| Minimum Load Current 25°C 25°C |IO| 10mA |IO(max)| 25°C, pulse Tmin Tmax Pmax |VO| |VO| Test Conditions Min. -1.213 -1.2 Typ. -1.25 -1.25 0.01 0.01 0.003 0.02 0.003 Max. -1.287 -1.3 0.04 0.04 0.04 0.07 Unit
Notes: Although power dissipation internally limited, these specifications applicable power dissipation TO-220 TO-3 Package; IO(max) Regulation measured constant junction temperature, using pulse testing with duty cycle. Changes output voltage heating effects covered under specification thermal regulation.
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Figure Load Regulation Figure Dropout Voltage
Figure Current Limit
Figure Temperature Stability
Figure Adjustment Current
Figure Minimum Operating Current
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Figure Ripple Rejection Versus Output Voltage Figure Output Impedance
Figure Ripple Rejection Versus Frequency
Figure Line Transient Response
Figure Ripple Rejection Versus Output Current
Figure Load Transient Response
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THERMAL REGULATION When power dissipated temperature gradient occurs across chip affecting individual circuit components. With regulator, this gradient especially severe since power dissipation large. Thermal regulation effect these temperature gradients output voltage percentage output change) watt power change specified time. Thermal regulation error independent electrical regulation temperature coefficient, occurs within 50ms after change power dissipation. Thermal regulation depends layout well electrical design. thermal regulation voltage regulator defined percentage Figure Typical Output Drift change watt, within first 10ms after step power, applied. LM137 specification 0.02%/W max.In figure typical LM337's output drifts only 0.03% 10V) when pulse applied 10ms. This performance thus well inside specification limit 0.02%/W 0.2% max. When pulse ended thermal regulation again shows step LM137 chip cools off. Note that load regulation error about 8mV(0.08%) additional thermal regulation error. figure when pulse applied 100ms, output drifts only slightly beyond drift first 10ms thermal error stays well within 0.1% (10mV).
LM337, -10V, 40V, 0.25A Vertical sensitivity 5mV/div.
Figure Typical Output Drift
LM337, -10V, 40V, 0.25A Horizontal sensitivity 5msN/div.
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TYPICAL APPLICATIONS Figure Adjustable Negative Voltage Regulator
solid tantalum 10µF aluminium electrolytic required stability. solid tantalum required only regulator more than from power supply filter capacitor
Figure Adjustable Voltage Regulator
capacitors optimal improve ripple rejection.
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Figure Current Regulator
Figure Negative Regulator With Protection Diode
When larger than protects LM137 case input supply shorted. When larger than 10µF larger than -25V, protects LM137 case output shorted.
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Figure 5.2V Regulator With Electronic Shutdown
Minimum output 1.3V when control input low.
Figure Current Regulator
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TO-3 MECHANICAL DATA
DIM. 30.10 3.88 10.9 16.9 26.2 4.09 39.5 1.185 0.152 0.96 MIN. 11.85 1.05 1.10 1.70 20.0 0.429 0.665 1.031 0.161 1.555 0.037 MAX. MIN. inch TYP. 0.466 0.041 0.043 0.066 0.342 0.787 MAX.
P003C/C
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TO-220 MECHANICAL DATA
DIM. DIA. 13.0 2.65 15.25 3.75 0.49 0.61 1.14 1.14 4.95 10.0 16.4 14.0 2.95 15.75 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 MIN. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 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
P011C
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Table Revision History
Date 19-Jul-2004 10-Jan-2005 Revision Description Changes Mistake Connection TO-3 figure page Mistake Connection TO-3 figure page
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