LM337 adjustable 3-terminal negative voltage regulator capable supplyi

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LM337 adjustable 3-terminal negative voltage regulator capable supplyi

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Three-Terminal Adjustable Output Negative Voltage Regulator
LM337 adjustable 3-terminal negative voltage regulator capable supplying excess over output voltage range -1.2 This voltage regulator exceptionally easy requires only external resistors output voltage. Further, employs internal current limiting, thermal shutdown safe area compensation, making essentially blow-out proof. LM337 serves wide variety applications including local, card regulation. This device also used make programmable output regulator, connecting fixed resistor between adjustment output, LM337 used precision current regulator. Output Current Excess Output Adjustable between -1.2 Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe-Area Compensation Floating Operation High Voltage Applications Eliminates Stocking many Fixed Voltages Available Surface Mount D2PAK Standard 3-Lead Transistor Package
LM337
THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR
SEMICONDUCTOR TECHNICAL DATA
SUFFIX PLASTIC PACKAGE CASE 221A Heatsink surface connected
Adjust Vout
Standard Application
IPROG Cin* IAdj CO** SUFFIX PLASTIC PACKAGE CASE (D2PAK)
Heatsink surface (shown terminal case outline drawing) connected
-Vin
LM337
Vout
-Vout
ORDERING INFORMATION
*Cin required regulator located more than inches from power supply filter. solid tantalum aluminum electrolytic recommended. **CO necessary stability. solid tantalum aluminum electrolytic **is recommended. 1.25 Device LM337BD2T LM337BT LM337D2T LM337T -40° +125°C +125°C Operating Temperature Range Package Surface Mount Insertion Mount Surface Mount Insertion Mount
Semiconductor Components Industries, LLC, 2001
March, 2001 Rev.
Publication Order Number: LM337/D
LM337
MAXIMUM RATINGS
Rating Input-Output Voltage Differential Power Dissipation Case 221A +25°C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case (D2PAK) +25°C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Operating Junction Temperature Range Storage Temperature Range Symbol VI-VO Value Unit
Tstg
Internally Limited Internally Limited +125 +150
°C/W °C/W °C/W °C/W
ELECTRICAL CHARACTERISTICS (|VI-VO| package; Tlow Thigh [Note Imax Pmax [Note 2].)
Characteristics Line Regulation (Note +25°C, |VI-VO| Load Regulation (Note +25°C, Imax |VO| |VO| Thermal Regulation, +25°C (Note Pulse Adjustment Current Adjustment Current Change, |VI-VO| Imax, Pmax, +25°C Reference Voltage, +25°C, |VI-VO| Imax, Pmax, Tlow Thigh Line Regulation (Note |VI-VO| Load Regulation (Note Imax |VO| |VO| Temperature Stability (Tlow Thigh) Minimum Load Current Maintain Regulation (|VI-VO| (|VI-VO| Maximum Output Current |VI-VO| Pmax, Package |VI-VO| Pmax, +25°C, Package Noise, +25°C, Ripple Rejection, (Note Without CAdj CAdj Long-Term Stability, Thigh (Note +25°C Endpoint Measurements Thermal Resistance Junction-to-Case, Package Figure Symbol Regline Regload Regtherm IAdj IAdj Vref Regline Regload ILmin Imax %/1.0 Hrs. °C/W 0.15 0.003 -1.213 -1.20 0.003 -1.250 -1.25 0.02 0.04 -1.287 -1.30 0.07 VO/W 0.01 0.04 Unit
NOTES: Tlow Thigh +125°C, LM337T, D2T. Tlow Thigh -40° +125°C, LM337BT, BD2T. Imax Pmax Load line regulation specified constant junction temperature. Change because heating effects covered under Thermal Regulation specification. Pulse testing with duty cycle used. CAdj, when used, connected between adjustment ground. Since Long Term Stability cannot measured each device before shipment, this specification engineering estimate average stability from lot. Power dissipation within voltage regulator produces temperature gradient die, affecting individual components die. These effects minimized proper integrated circuit design layout techniques. Thermal Regulation effect these temperature gradients output voltage expressed percentage output change watt power change specified time.
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LM337
Representative Schematic Diagram
2.0k 2.5k Vout 15pF 5.0k 100k 15pF 2.0k 25pF Adjust
4.0k 6.0k 1.0k 9.6k 8.0k 2.9k 4.0k 100k 3.0k 100pF 2.2k 5.0pF 5.0k 2.4k 0.05 This device contains active transistors.
Pulse testing required. Duty Cycle suggested.
IAdj Adjust LM337 Vout
Line Regulation
Figure Line Regulation IAdj/Line Test Circuit
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LM337
IAdj Vout (max Load)
Pulse testing required. Duty Cycle suggested.
Adjust LM337
(min Load) (max Load) (min Load) (max Load) (min Load)
Load Regulation (mV) (min Load) (max Load)
Load Regulation
Figure Load Regulation IAdj/Load Test Circuit
IAdj Vref Vout
Adjust Calculate LM337
Vref This assumes IAdj negligible.
Pulse testing required. Duty Cycle suggested.
Figure Standard Test Circuit
Adjust 14.3
CAdj
10µF
LM337
Vout
1N4002
Vout -1.25
Discharges CAdj output shorted Ground.
Figure Ripple Rejection Test Circuit
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LM337
OUTPUT VOLTAGE CHANGE -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 JUNCTION TEMPERATURE (°C) Vout OUTPUT CURRENT
25°C
Vin-Vout INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure Load Regulation
Figure Current Limit
Vout INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) IAdj, ADJUSTMENT CURRENT (µA) JUNCTION TEMPERATURE (°C)
Vout -5.0
JUNCTION TEMPERATURE (°C)
Figure Adjustment Current
Figure Dropout Voltage
1.27 REFERENCE VOLTAGE QUIESCENT CURRENT (mA) Vin-Vout INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) 25°C
1.26
1.25
1.24
1.23
JUNCTION TEMPERATURE (°C)
Figure Temperature Stability
Figure Minimum Operating Current
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LM337
RIPPLE REJECTION (dB) Vout 25°C -5.0 Vout, OUTPUT VOLTAGE RIPPLE REJECTION (dB) CAdj 0.01 Vout 25°C OUTPUT CURRENT CAdj Without CAdj
Without CAdj
Figure Ripple Rejection versus Output Voltage
Figure Ripple Rejection versus Output Current
RIPPLE REJECTION (dB) Without CAdj CAdj OUTPUT IMPEDANCE Vout 25°C
Vout 25°C Without CAdj CAdj
10-1
10-2
10-3
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure Ripple Rejection versus Frequency
Figure Output Impedance
INPUT OUTPUT VOLTAGE CHANGE VOLTAGE DEVIATION
OUTPUT VOLTAGE DEVIATION
-0.2 -0.4 -0.6 -0.5 -1.0 -1.5 CAdj Without CAdj
-0.2 -0.4 -0.5 -1.0 Without CAdj CAdj Vout 25°C TIME (µs)
LOAD CURRENT
Vout 25°C TIME (µs)
Figure Line Transient Response
Figure Load Transient Response
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LM337
APPLICATIONS INFORMATION
Basic Circuit Operation
LM337 3-terminal floating regulator. operation, LM337 develops maintains nominal -1.25 reference (Vref) between output adjustment terminals. This reference voltage converted programming current (IPROG) (see Figure 17), this constant current flows through from ground. regulated output voltage given
near load ground provide remote ground sensing improve load regulation.
External Capacitors
Since current into adjustment terminal (IAdj) represents error term equation, LM337 designed control IAdj less than keep constant. this, quiescent operating current returned output terminal. This imposes requirement minimum load current. load current less than this minimum, output voltage will rise. Since LM337 floating regulator, only voltage differential across circuit which important performance, operation high voltages with respect ground possible.
Vout IAdj Adjust LM337 Vout IPROG
tantalum input bypass capacitor (Cin) recommended reduce sensitivity input line impedance. adjustment terminal bypassed ground improve ripple rejection. This capacitor (CAdj) prevents ripple from being amplified output voltage increased. capacitor should improve ripple rejection about application. output capacitance (CO) form tantalum aluminum electrolytic capacitor required stability.
Protection Diodes
Vref Vout
When external capacitors used with regulator sometimes necessary protection diodes prevent capacitors from discharging through current points into regulator. Figure shows LM337 with recommended protection diodes output voltages excess high capacitance values CAdj µF). Diode prevents from discharging thru during input short circuit. Diode protects against capacitor CAdj discharging through during output short circuit. combination diodes prevents CAdj from discharging through during input short circuit.
-Vin Adjust LM337 Vout CAdj Vout
Vref -1.25 Typical
Figure Basic Circuit Configuration Load Regulation
1N4002
LM337 capable providing extremely good load regulation, precautions needed obtain maximum performance. best performance, programming resistor (R1) should connected close regulator possible minimize line drops which effectively appear series with reference, thereby degrading regulation. ground returned
THERMAL RESISTANCE JUNCTION C/W) Free Mounted Vertically Minimum Size
Vout
1N4002
Figure Voltage Regulator with Protection Diodes
PD(max) +50°C Copper
LENGTH COPPER (mm)
Figure D2PAK Thermal Resistance Maximum Power Dissipation versus P.C.B. Copper Length http://onsemi.com
MAXIMUM POWER DISSIPATION
LM337
PACKAGE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 221A-09 ISSUE
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: INCH. DIMENSION DEFINES ZONE WHERE BODY LEAD IRREGULARITIES ALLOWED. INCHES 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.045 0.055 0.235 0.255 0.000 0.050 0.045 -0.080 MILLIMETERS 14.48 15.75 9.66 10.28 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 1.15 1.39 5.97 6.47 0.00 1.27 1.15 -2.04
SEATING PLANE
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LM337
PACKAGE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 936-03 (D2PAK) ISSUE
OPTIONAL CHAMFER
TERMINAL
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: INCH. CONTOUR OPTIONAL WITHIN DIMENSIONS DIMENSIONS ESTABLISH MINIMUM MOUNTING SURFACE TERMINAL DIMENSIONS INCLUDE MOLD FLASH GATE PROTRUSIONS. MOLD FLASH GATE PROTRUSIONS EXCEED 0.025 (0.635) MAXIMUM. INCHES 0.386 0.403 0.356 0.368 0.170 0.180 0.026 0.036 0.045 0.055 0.051 0.100 0.539 0.579 0.125 0.050 0.000 0.010 0.088 0.102 0.018 0.026 0.058 0.078 0.116 0.200 0.250 MILLIMETERS 9.804 10.236 9.042 9.347 4.318 4.572 0.660 0.914 1.143 1.397 1.295 2.540 13.691 14.707 3.175 1.270 0.000 0.254 2.235 2.591 0.457 0.660 1.473 1.981 2.946 5.080 6.350
0.010 (0.254)
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LM337
Notes
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LM337
Notes
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LM337
Semiconductor trademarks Semiconductor Components Industries, (SCILLC). SCILLC reserves right make changes without further notice products herein. SCILLC makes warranty, representation guarantee regarding suitability products particular purpose, does SCILLC assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential incidental damages. "Typical" parameters which provided SCILLC data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. SCILLC does convey license under patent rights rights others. SCILLC products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure SCILLC product could create situation where personal injury death occur. Should Buyer purchase SCILLC products such unintended unauthorized application, Buyer shall indemnify hold SCILLC officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that SCILLC negligent regarding design manufacture part. SCILLC Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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LM337/D

LM337 adjustable 3-terminal negative voltage regulator capable supplyi

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