Three-terminal adjustable negative voltage regulators Output volt

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Three-terminal adjustable negative voltage regulators Output volt

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LM137 LM337
Three-terminal adjustable negative voltage regulators
Output voltage adjustable down VREF guaranteed output current typical load regulation 0.01 typical line regulation Current limit constant with temperature Ripple rejection: Standard 3-lead transistor packages Excellent thermal regulation: 0.002 ppm/°C temperature coefficient
TO-220 TO-3
Description
LM137 series adjustable 3-terminal negative voltage regulators capable supplying excess -1.5 over -1.2 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.
Included chip current limit, thermal overload protection safe area protection. overload protection circuitry remains fully functional even adjustment terminal disconnected.
Table
Device summary
Part numbers LM137 LM337 Order codes LM137K LM337K Temperature range
July 2008
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www.st.com
Contents
LM137 LM337
Contents
Diagram configuration Maximum ratings Electrical characteristics Typical characteristics Thermal regulation Typical application Package mechanical data Revision history
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LM137 LM337
Diagram
Figure
Diagram
Schematic diagram
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configuration
LM137 LM337
Figure
configuration
connections (top view)
TO-220
TO-3
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LM137 LM337
Maximum ratings
Table
Symbol TSTG
Maximum ratings
Absolute maximum ratings
Parameter Input output voltage differential Output current Power dissipation Storage temperature range LM137 Operating junction temperature range LM337 Value Internally limited Unit
Note:
Absolute maximum ratings those values beyond which damage device occur. Functional operation under these condition implied. Thermal data
Parameter Thermal resistance junction-case max. Thermal resistance junction-ambient max. TO-220 TO-3 Unit °C/W °C/W
Table
Symbol RthJC RthJA
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Electrical characteristics
LM137 LM337
Table
Symbol
Electrical characteristics
Electrical characteristics LM137 unless otherwise specified)
Parameter 25°C Test conditions Min. -1.225 -1.2 Typ. -1.25 -1.25 0.01 0.01 0.002 25°C, |IO| |IO(max)| |IO| 10mA |IO(max)| =25°C output noise Ripple rejection ratio Temperature stability Long term stability 125°C, 1000 25°C, CADJ 0.24 |VO| |VO| 0.02 0.003 Max. -1.275 -1.3 0.02 0.02 0.02 0.05 Unit
VREF
Reference voltage
Tmin Tmax |IO| 10mA |IO(max)| Pmax 25°C 25°C |IO| 10mA |IO(max)| 25°C, pulse |VO| |VO|
Line regulation
Load regulation Thermal regulation
IADJ IADJ
Adjustment current Adjustment current change Line regulation Load regulation
|IO(min)| Minimum load current
Short circuit output current
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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LM137 LM337 Table
Symbol
Electrical characteristics
Electrical characteristics LM337 unless otherwise specified).
Parameter 25°C Test conditions Min. -1.213 -1.2 Typ. -1.25 -1.25 0.01 0.01 0.003 25°C, |IO| |IO(max)| |IO| 10mA |IO(max)| output noise Ripple rejection ratio Temperature stability Long term stability 125°C, 1000 25°C, CADJ 0.15 |VO| |VO| 0.02 0.003 Max. -1.287 -1.3 0.04 0.04 0.04 0.07 Unit
VREF
Reference voltage
Tmin Tmax |IO| 10mA |IO(max)|, Pmax 25°C 25°C |IO| 10mA |IO(max)| 25°C, pulse |VO| |VO|
Line regulation
Load regulation Thermal regulation
IADJ IADJ
Adjustment current Adjustment current change Line regulation Load regulation
|IO(min)| Minimum load current
Short circuit output current
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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Typical characteristics
LM137 LM337
Figure
Typical characteristics
Load regulation Figure Current limit
Figure
Adjustment current
Figure
Dropout voltage
Figure
Temperature stability
Figure
Minimum operating current
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LM137 LM337
Typical characteristics
Figure
Ripple rejection output voltage
Figure Ripple rejection frequency
Figure Ripple rejection output current
Figure Output impedance
Figure Line transient response
Figure Load transient response
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Thermal regulation
LM137 LM337
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 after change power dissipation. Thermal regulation depends layout well electrical design. thermal regulation voltage regulator defined percentage change watt, within first 10ms after step power, applied. LM137 specification 0.02 max. Figure typical LM337's output drifts only 0.03% when pulse applied This performance thus well inside specification limit 0.02 0.2% max. When pulse ended thermal regulation again shows step LM137 chip cools off. Note that load regulation error about (0.08 additional thermal regulation error. Figure when pulse applied output drifts only slightly beyond drift first thermal error stays well within 0.1% mV).
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LM137 LM337
Typical application
Typical application
Figure Adjustable negative voltage regulator
solid tantalum 10µF aluminium electrolytic required stability. solid tantalum required only regulator more than from power supply filter capacitors
Figure Adjustable voltage regulator
capacitors optimal improve ripple rejection.
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Typical application
LM137 LM337
Figure Current regulator
Figure Negative regulator with protection diodes
When larger than protects LM137 case input supply shorted. When larger than larger than protects LM137 case output shorted.
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LM137 LM337
Typical application
Figure regulator with electronic shutdown
Minimum output when control input low.
Figure Current regulator
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Package mechanical data
LM137 LM337
Package mechanical data
order meet environmental requirements, offers these devices ECOPACK® packages. These packages have lead-free second level interconnect. category second Level Interconnect marked package inner label, compliance with JEDEC Standard JESD97. maximum ratings related soldering conditions also marked inner label. ECOPACK trademark. ECOPACK specifications available www.st.com.
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LM137 LM337
Package mechanical data
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 Typ. 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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Package mechanical data
LM137 LM337
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. Typ. 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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LM137 LM337
Revision history
Table
Date
Revision history
Document revision history
Revision First issue. Modified connection TO-3. Added: Table page Changes
19-Jul-2004 10-Jan-2005 17-Jul-2008
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LM137 LM337
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Three-terminal adjustable negative voltage regulators Output volt

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