LM317
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Order this document LM317/D
LM317 Three-Terminal Adjustable Output Positive Voltage Regulator
LM317 adjustable 3-terminal positive voltage regulator capable supplying excess over output voltage range 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. LM317 serves wide variety applications including local, card regulation. This device also used make programmable output regulator, connecting fixed resistor between adjustment output, LM317 used precision current regulator. Output Current Excess
THREE-TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR
SEMICONDUCTOR TECHNICAL DATA
Output Adjustable between Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe-Area Compensation Floating Operation High Voltage Applications Available Surface Mount D2PAK, Standard 3-Lead Transistor Package Eliminates Stocking many Fixed Voltages
SUFFIX PLASTIC PACKAGE CASE 221A Heatsink surface connected
Standard Application
LM317 IAdj Cin* Adjust Vout
Adjust Vout
SUFFIX PLASTIC PACKAGE CASE (D2PAK)
Heatsink surface (shown terminal case outline drawing) connected
ORDERING INFORMATION
required regulator located appreciable distance from power supply filter. needed stability, however, does improve transient response. Device LM317BD2T LM317BT LM317D2T LM317T +125°C Operating Temperature Range +125°C Package Surface Mount Insertion Mount Surface Mount Insertion Mount
1.25 IAdj
Since IAdj controlled less than error associated with this term negligible most applications.
Motorola, Inc. 1996
MOTOROLA ANALOG DEVICE DATA
LM317
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 packages; Tlow Thigh [Note Imax Pmax
[Note unless otherwise noted.) Characteristics Line Regulation (Note +25°C, VI-VO Load Regulation (Note +25°C, Imax Thermal Regulation, +25°C (Note Pulse Adjustment Current Adjustment Current Change, VI-VO Imax, Pmax Reference Voltage, VI-VO Imax, Pmax Line Regulation (Note VI-VO Load Regulation (Note Imax Temperature Stability (Tlow Thigh) Minimum Load Current Maintain Regulation (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 Case, Package Figure Symbol Regline Regload Regtherm IAdj IAdj Vref Regline Regload ILmin Imax 0.15 %/1.0 Hrs. °C/W 0.003 0.03 1.25 0.02 0.07 0.07 VO/W 0.01 0.04 Unit
NOTES: Tlow Thigh +125°C, LM317T, D2T. Tlow Thigh +125°C, LM317BT, BD2T. Imax Pmax Load line regulation specified constant junction temperature. Changes heating effects must taken into account separately. 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.
MOTOROLA ANALOG DEVICE DATA
LM317
Representative Schematic Diagram
5.6k 6.3V 6.7k 125k 12.4k 5.0pF 6.8k 6.3V
6.3V 3.6k 5.8k 5.1k
2.4k 12.5k
Vout Adjust This device contains active transistors.
Figure Line Regulation IAdj/Line Test Circuit
LM317 Pulse testing required. Duty Cycle suggested. Adjust IAdj Line Regulation Vout
MOTOROLA ANALOG DEVICE DATA
LM317
Figure Load Regulation IAdj/Load Test Circuit
LM317 Vout (max Load) IAdj (min Load) (max Load) (min Load)
Adjust
Pulse testing required. Duty Cycle suggested.
Load Regulation (mV) (min Load) (max Load)
Load Regulation
(min Load) (max Load) (min Load)
Figure Standard Test Circuit
LM317 Vout
Adjust IAdj
Vref
ISET
Pulse testing required. Duty Cycle suggested.
Calculate Vout ISET 1.250 Calculate Assume ISET 5.25
Figure Ripple Rejection Test Circuit
LM317 Vout
Adjust
1N4002
Vout
1.65
CAdj
Discharges CAdj output shorted Ground.
MOTOROLA ANALOG DEVICE DATA
LM317
Figure Load Regulation
Vout, OUTPUT VOLTAGE CHANGE OUTPUT CURRENT -0.2 -0.4 -0.6 -0.8 -1.0 JUNCTION TEMPERATURE (°C) Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) Vout 25°C 150°C 55°C
Figure Current Limit
Figure Adjustment Current
Adj, ADJUSTMENT CURRENT in-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure Dropout Voltage
Vout
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure Temperature Stability
1.26 Vref, REFERENCE VOLTAGE QUIESCENT CURRENT (mA) 1.22 JUNCTION TEMPERATURE (°C)
Figure Minimum Operating Current
-55°C +25°C +150°C
1.25
1.24
1.23
Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
MOTOROLA ANALOG DEVICE DATA
LM317
Figure Ripple Rejection versus Output Current
RIPPLE REJECTION (dB) Vout 25°C 0.01 CAdj Without CAdj
Figure Ripple Rejection versus Output Voltage
CAdj RIPPLE REJECTION (dB) Vout, OUTPUT VOLTAGE Vout 25°C Without CAdj
OUTPUT CURRENT
Figure Ripple Rejection versus Frequency
RIPPLE REJECTION (dB) FREQUENCY (Hz) Vout 25°C OUTPUT IMPEDANCE
Figure Output Impedance
10-1
Vout 25°C Without CAdj
10-2 CAdj 10-3 FREQUENCY (Hz)
CAdj Without CAdj
Vout OUTPUT VOLTAGE DEVIATION
Vout OUTPUT VOLTAGE DEVIATION
Figure Line Transient Response
-0.5 -1.0 -1.5 TIME (µs) Vout 25°C CAdj
Figure Load Transient Response
-1.0 -2.0 -3.0 Without CAdj TIME (µs) Vout 25°C CAdj
INPUT VOTLAGE CHANGE
LOAD CURRENT
Without CAdj
MOTOROLA ANALOG DEVICE DATA
LM317
APPLICATIONS INFORMATION
Basic Circuit Operation LM317 3-terminal floating regulator. operation, LM317 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 ground. regulated output voltage given
Vref IAdj
Since current from adjustment terminal (IAdj) represents error term equation, LM317 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 LM317 floating regulator, only voltage differential across circuit which important performance, operation high voltages with respect ground possible. Figure Basic Circuit Configuration
Vout LM317 Adjust Vref IPROG Vout
External Capacitors disc 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. Although LM317 stable with output capacitance, like feedback circuit, certain values external capacitance cause excessive ringing. output capacitance (CO) form tantalum aluminum electrolytic capacitor output swamps this effect insures stability. Protection Diodes When external capacitors used with regulator sometimes necessary protection diodes prevent capacitors from discharging through current points into regulator. Figure shows LM317 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. Figure Voltage Regulator with Protection Diodes
IAdj Vref 1.25 Typical
Vout 1N4002 Vout
LM317 Load Regulation LM317 capable providing extremely good load regulation, precautions needed obtain maximum performance. best performance, Adjust programming resistor (R1) should connected close regulator possible minimize line drops which effectively appear series with reference, thereby degrading regulation. ground returned near load ground provide remote ground sensing improve load regulation. Figure D2PAK Thermal Resistance Maximum Power Dissipation versus P.C.B. Copper Length PD(max) +50°C Free Mounted Vertically Copper Minimum Size MAXIMUM POWER DISSIPATION THERMAL RESISTANCE JUNCTION-TO-AIR (°C/W)
1N4002 CAdj
LENGTH COPPER (mm)
MOTOROLA ANALOG DEVICE DATA
LM317
Figure ``Laboratory'' Power Supply with Adjustable Current Limit Output Voltage
1N4002 LM317 Vout1 Vin2 LM317 Vout Adjust Current Limit Adjust Diodes transistor added allow adjustment output voltage protects both LM317's during input short circuit. 1.0K 1N4001 1N4001 Adjust Voltage Adjust 1N4001 2N3822 2N5640 IN4001 Output Range: Output Range: IN4001 Iout Vout Tantalum
Vin1
Figure Adjustable Current Limiter
LM317 Vout 1.25 Iout
Figure Electronic Shutdown Regulator
1N4002 Vout LM317 Adjust MPS2222 2N5640 Control
Adjust
1N4001 1N4001
provide current limiting system ground, source must tied negative voltage below 1.25 Vref IOmax IDSS Vref IDDS
BVDSS 1.25 VSS, ILmin IDSS shown
VSS*
Minimum Vout 1.25 protects device during input short circuit.
Figure Slow Turn-On Regulator
LM317 Adjust MPS2907 1N4001 Vout
Figure Current Regulator
Vout LM317 Iout
Adjust
IAdj 1.25 Iout
MOTOROLA ANALOG DEVICE DATA
LM317
OUTLINE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 221A-06 ISSUE
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: INCH. 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 4.82 4.07 0.88 0.64 3.73 3.61 2.66 2.42 3.93 2.80 0.64 0.46 12.70 14.27 1.52 1.15 5.33 4.83 3.04 2.54 2.79 2.04 1.39 1.15 6.47 5.97 1.27 0.00 1.15 2.04
SEATING PLANE
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)
MOTOROLA ANALOG DEVICE DATA
LM317
Motorola reserves right make changes without further notice products herein. Motorola makes warranty, representation guarantee regarding suitability products particular purpose, does Motorola assume liability arising application product circuit, specifically disclaims liability, including without limitation consequential incidental damages. "Typical" parameters which provided Motorola 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. Motorola does convey license under patent rights rights others. Motorola products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure Motorola product could create situation where personal injury death occur. Should Buyer purchase Motorola products such unintended unauthorized application, Buyer shall indemnify hold Motorola 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 Motorola negligent regarding design manufacture part. Motorola registered trademarks Motorola, Inc. Motorola, Inc. Equal Opportunity/Affirmative Action Employer. Mfax trademark Motorola, Inc. reach EUROPE Locations Listed: Motorola Literature Distribution; P.O. 5405, Denver, Colorado 80217. 303-675-2140 1-800-441-2447 JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. 81-3-5487-8488
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MOTOROLA ANALOG DEVICELM317/D DATA
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