LM137/LM337 3-Terminal Adjustable Negative Regulators LM137/LM337
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LM137/LM337 3-Terminal Adjustable Negative Regulators
LM137/LM337 3-Terminal Adjustable Negative Regulators
LM137/LM337 adjustable 3-terminal negative voltage regulators capable supplying excess -1.5A over output voltage range -1.2V -37V. These regulators exceptionally easy apply, requiring only external resistors output voltage output capacitor frequency compensation. circuit design been optimized excellent regulation thermal transients. Further, LM137 series features internal current limiting, thermal shutdown safe-area compensation, making them virtually blowout-proof against overloads. LM137/LM337 serve wide variety applications including local on-card regulation, programmable-output voltage regulation precision current regulation. LM137/ LM337 ideal complements LM117/LM317 adjustable positive regulators. ripple rejection Excellent rejection thermal transients ppm/°C temperature coefficient Temperature-independent current limit Internal thermal overload protection Product Enhancement tested Standard 3-lead transistor package Output short circuit protected
LM137 Series Packages Power Capability
Rated Device LM137/337 LM337 LM337 Package TO-3 TO-39 TO-220 SOT-223 (MP) Power Dissipation Design Load Current 1.5A 0.5A 1.5A
Features
Output voltage adjustable from -1.2V -37V 1.5A output current guaranteed, -55°C +150°C Line regulation typically 0.01%/V Load regulation typically 0.3% Excellent thermal regulation, 0.002%/W
Typical Applications
Adjustable Negative Voltage Regulator
Comparison between SOT-223 D-Pak (TO-252) Packages
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Scale
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Full output current available high input-output voltages
solid tantalum aluminum electrolytic required stability solid tantalum required only regulator more than from power-supply filter capacitor Output capacitors range 1000 aluminum tantalum electrolytic commonly used provide improved output impedance rejection transients
2001 National Semiconductor Corporation
DS009067
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LM137/LM337
Absolute Maximum Ratings (Notes
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Power Dissipation Input-Output Voltage Differential Operating Junction Temperature Range LM137 Internally Limited -55°C +150°C
LM337 Storage Temperature Lead Temperature (Soldering, sec.) Plastic Package (Soldering, sec.) Rating
+125°C -65°C +150°C 300°C 260°C Volts
Electrical Characteristics
(Note Parameter Line Regulation Load Regulation Thermal Regulation Adjustment Current Adjustment Current Charge IMAX 3.0V |VIN VOUT| 40V, 25°C Reference Voltage 25°C (Note |VIN VOUT| 40V, (Note IOUT IMAX, PMAX Line Regulation Load Regulation Temperature Stability Minimum Load Current Current Limit |VIN VOUT| 40V, (Note IOUT IMAX, (Note TMIN TMAX |VIN VOUT| |VIN VOUT| |VIN VOUT| Package Package |VIN VOUT| 40V, 25°C Package Package Output Noise, VOUT Ripple Rejection Ratio Long-Term Stability Thermal Resistance, Junction Case Thermal Resistance, Junction Ambient Heat Sink) 25°C, VOUT -10V, CADJ 125°C, 1000 Hours Package Package Package Package Package Package Package 0.24 0.15 0.17 0.003 0.15 0.10 0.17 0.003 °C/W °C/W °C/W °C/W °C/W °C/W °C/W 0.02 0.05 0.02 0.07 -1.225 -1.250 -1.275 -1.213 -1.250 -1.287 -1.200 -1.250 -1.300 -1.200 -1.250 -1.300 Conditions 25°C, |VIN VOUT| (Note 25°C, IOUT IMAX 25°C, Pulse 0.002 0.02 0.003 0.04 LM137 0.01 0.02 LM337 0.01 0.04 Units
Note Unless otherwise specified, these specifications apply -55°C +150°C LM137, +125°C LM337; VOUT IOUT 0.1A TO-39 package IOUT 0.5A TO-3, SOT-223 TO-220 packages. Although power dissipation internally limited, these specifications applicable power dissipations TO-39 SOT-223 (see Application Hints), TO-3, TO-220. IMAX 1.5A TO-3, SOT-223 TO-220 packages, 0.2A TO-39 package. Note Regulation measured constant junction temperature, using pulse testing with duty cycle. Changes output voltage heating effects covered under specification thermal regulation. Load regulation measured output point 1/8" below base TO-3 TO-39 packages. Note Selected devices with tightened tolerance reference voltage available. Note Refer RETS137H drawing LM137H RETS137K drawing LM137K military specifications.
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LM137/LM337
Schematic Diagram
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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 after change power dissipation. Thermal regulation depends layout well electrical design. thermal regulation voltage regulator defined percentage change VOUT, Watt, within first after step power applied. LM137's specification 0.02%/W, max.
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LM137, VOUT -10V VOUT -40V 0.25A Vertical sensitivity, mV/div
FIGURE Figure typical LM137's output drifts only 0.03% VOUT -10V) when pulse applied 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 (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
Thermal Regulation
(Continued) TO-220 Plastic Package
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LM137, VOUT -10V VOUT -40V 0.25A Horizontal sensitivity, ms/div
FIGURE
Connection Diagrams
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TO-3 Metal Package
Front View Order Number LM337T Package Number T03B 3-Lead SOT-223
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Case Input
Bottom View Order Number LM137K/883 LM137KPQML LM137KPQMLV(Note Package Number K02C Order Number LM337K STEEL Package Number K02A TO-39 Metal Package
Front View Order Number LM337IMP Package Marked N02ASee Package Number MA04A
Application Hints
When value (H-A) found using equation shown, heatsink must selected that value that less than equal this number. HEATSINKING SOT-223 PACKAGE PARTS SOT-223 ("MP") packages copper plane itself heatsink. optimize heat sinking ability plane PCB, solder package plane.
Figures show information SOT-223 package. Figure assumes (J-A) 75°C/W ounce copper 51°C/W ounce copper maximum junction temperature 125°C.
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Case Input Note 5962P99517 Radiation Tolerant Devices
Bottom View Order Number LM137H, LM137H/883 LM337H LM137HPQML LM137HPQMLV(Note Package Number H03A
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LM137/LM337
Application Hints
(Continued)
Typical Applications
Adjustable Voltage Regulator
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FIGURE (J-A) Copper ounce) Area SOT-223 Package
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Full output current available high input-output voltages *The capacitors optional improve ripple rejection
Current Regulator
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FIGURE Maximum Power Dissipation TAMB SOT-223 Package Please AN1028 power enhancement techniques used with SOT-223 package.
Negative Regulator with Protection Diodes
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supply shorted **When larger than -VOUT larger than -25V, protects LM137 case output shorted
*When larger than protects LM137 case input
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LM137/LM337
Typical Applications
(Continued) High Stability -10V Regulator
-5.2V Regulator with Electronic Shutdown*
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DS009067-10
*Minimum output -1.3V when control input
Adjustable Current Regulator
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LM137/LM337
Typical Performance Characteristics
Load Regulation Current Limit
Steel Packages) Adjustment Current
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Dropout Voltage
Temperature Stability
Minimum Operating Current
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Ripple Rejection
Ripple Rejection
Ripple Rejection
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Output Impedance
Line Transient Response
Load Transient Response
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DS009067-26
DS009067-27
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LM137/LM337
Physical Dimensions
inches (millimeters) unless otherwise noted
Metal Package Order Number LM137H, LM137H/883 LM337H Package Number H03A
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LM137/LM337
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Metal Package Order Number LM337K STEEL Package Number K02A
Mil-Aero Metal Package Order Number LM137K/883 Package Number K02C
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LM137/LM337
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
3-Lead SOT-223 Package Order Number LM337IMP Package Number M04A
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LM137/LM337 3-Terminal Adjustable Negative Regulators
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
TO-220 Plastic Package Order Number LM337T Package Number T03B
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.
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