LM317M. 500 ma Adjustable Output, Positive Voltage Regulator

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1 5 ma able Output, Positive Voltage Regulator The is an adjustable threeterminal positive voltage regulator capable of supplying in excess of 5 ma over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blowout proof. The serves a wide variety of applications including local, oncard regulation. This device also makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the can be used as a precision current regulator. Features Output Current in Excess of 5 ma Output able between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor SafeArea Compensation Floating Operation for High Voltage Applications Eliminates Stocking Many Fixed Voltages PbFree Packages are Available Heatsink surface connected to Pin 2 TO22AB T SUFFIX CASE 221AB SOT223 ST SUFFIX CASE 318E DT SUFFIX CASE 369C Heatsink Surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. * C in.1 F I Adj R 1 24 ** CO 1. F 1 PIN ASSIGNMENT 2 3 * = C in is required if regulator is located an appreciable distance from power supply filter. ** = C O is not needed for stability, however, it does improve transient response. Vout 1.25 V 1 R1 I Adj R2 Since I Adj is controlled to less than 1 A, the error associated with this term is negligible in most applications. ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 1 of this data sheet. DEVICE MARKING INFORMATION See general marking information in the device marking section on page 11 of this data sheet. Figure 1. Simplified Application Semiconductor Components Industries, LLC, 26 August, 26 Rev Publication Order Number: /D

2 MAXIMUM RATINGS (T A = 25 C, unless otherwise noted.) Rating Symbol Value Unit InputOutput Voltage Differential V I V O 4 Vdc Power Dissipation (Package Limitation) (Note 1) Plastic Package, T Suffix, Case 221A T A = 25 C Thermal Resistance, JunctiontoAir Thermal Resistance, JunctiontoCase Plastic Package, DT Suffix, Case 369C T A = 25 C Thermal Resistance, JunctiontoAir Thermal Resistance, JunctiontoCase Plastic Package, ST Suffix, Case 318E T A = 25 C Thermal Resistance, JunctiontoAir Thermal Resistance, JunctiontoCase P D JA JC P D JA JC P D JA JC Internally Limited 7 5. Internally Limited Internally Limited Operating Junction Temperature Range T J 4 to 125 C Storage Temperature Range T stg 65 to 15 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. Figure 25 provides thermal resistance versus PC board pad size. ELECTRICAL CHARACTERISTICS (V I V O = 5. V; I O =.1 A, T J = T low to T high (Note 2), unless otherwise noted.) / B Characteristics Figure Symbol Min Typ Max Unit Line Regulation (Note 3) (T A = 25 C, 3. V V I V O 4 V) 3 Reg line.1.4 %/V Load Regulation (Note 3) T A = 25 C, 1 ma I O A V O 5. V V O 5. V 4 Reg load ment Pin Current 5 I Adj 5 1 A ment Pin Current Change 3, 4 I Adj.2 5. A 2.5 V V I V O 4 V, 1 ma I L A, P D P max Reference Voltage 5 V ref V 3. V V I V O 4 V, 1 ma I L A, P D P max Line Regulation (Note 3) 3. V V I V O 4 V Load Regulation (Note 3) 1 ma I O A V O 5. V V O 5. V C/W C/W C/W C/W C/W C/W mv % V O 3 Reg line.2.7 %/V 4 Reg load Temperature Stability (T low T J T high ) 5 T S.7 % V O Minimum Load Current to Maintain Regulation (V I V O = 4 V) 5 I Lmin ma Maximum Output Current 5 I max A V I V O 15 V, P D P max V I V O = 4 V, P D P max, T A = 25 C RMS Noise, % of V O (T A = 25 C, 1 Hz f 1 khz) N.3 % V O Ripple Rejection, V O = 1 V, f = 12 Hz (Note 4) 6 RR db Without C Adj C Adj = 1 F LongTerm Stability, T J = T high (Note 5) T A = 25 C for Endpoint Measurements mv % V O 5 S.3 1. %/1. khrs. 2. T low to T high = to 125 C for T low to T high = 4 to 125 C for B. 3. Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. C Adj, when used, is connected between the adjustment pin and ground. 5. Since LongTerm Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lottolot. 2

3 ELECTRICAL CHARACTERISTICS (V I V O = 5. V; I O =.1 A, T J = T low to T high (Note 6), unless otherwise noted.) A / AB Characteristics Figure Symbol Min Typ Max Unit Line Regulation (Note 7) (T A = 25 C, 3. V V I V O 4 V) 3 Reg line.1.4 %/V Load Regulation (Note 7) T A = 25 C, 1 ma I O A V O 5. V V O 5. V 4 Reg load ment Pin Current 5 I Adj 5 1 A ment Pin Current Change 3, 4 I Adj.2 5. A 2.5 V V I V O 4 V, 1 ma I L A, P D P max Reference Voltage 5 V ref V 3. V V I V O 4 V, 1 ma I L A, P D P max Line Regulation (Note 7) 3. V V I V O 4 V Load Regulation (Note 7) 1 ma I O A V O 5. V V O 5. V mv % V O 3 Reg line.2.7 %/V 4 Reg load Temperature Stability (T low T J T high ) 5 T S.7 % V O Minimum Load Current to Maintain Regulation (V I V O = 4 V) 5 I Lmin ma Maximum Output Current 5 I max A V I V O 15 V, P D P max V I V O = 4 V, P D P max, T A = 25 C RMS Noise, % of V O (T A = 25 C, 1 Hz f 1 khz) N % V O Ripple Rejection, V O = 1 V, f = 12 Hz (Note 8) 6 RR db Without C Adj C Adj = 1 F LongTerm Stability, T J = T high (Note 9) T A = 25 C for Endpoint Measurements mv % V O 5 S.3 1. %/1. khrs. 6. T low to T high = to 125 C for A T low to T high = 4 to 125 C for AB. 7. Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 8. C Adj, when used, is connected between the adjustment pin and ground. 9. Since LongTerm Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lottolot. 3

4 k V 6.8V 35 18k k 5 2k 5.1k 4 6.3V k 6.k 1 pf 1 pf k 12.8k 5 Figure 2. Representative Schematic Diagram * V CC Line Regulation (%/V) = V OH V OL x 1 V OL V IH V IL V OH V OL C in.1 F I Adj R 1 24 C O 1. F R L * Pulse Testing Required: Duty Cycle is suggested. R2 Figure 3. Line Regulation and I Adj /Line Test Circuit 4

5 Load Regulation (mv) = V O (min Load) V O (max Load) Load Regulation (% V O ) = V O (min Load) V O (max Load) V O (min Load) X 1 I L V O (min Load) VO (max Load) C in.1 F I Adj R 1 24 C O 1. F * R L (max Load) R L (min Load) * Pulse Testing Required: Duty Cycle is suggested. Figure 4. Load Regulation and I Adj /Load Test Circuit I L V I C in.1 F I Adj R 1 24 V ref C O 1 F R L V O I SET *Pulse Testing Required: Duty Cycle is suggested. To Calculate : = I SET 1.25 V Assume I SET = 5.25 ma Figure 5. Standard Test Circuit 24V 14V f = 12 Hz Vout = 1 V R 1 24 D 1 * 1N42 R L C in.1 F C O 1. F V O 1.65K ** C Adj 1 F * D 1 Discharges C Adj if Output is Shorted to Ground. **C Adj provides an AC ground to the adjust pin. Figure 6. Ripple Rejection Test Circuit 5

6 9, OUTPUT VOLTAGE CHANGE (%) Δ = 45 V = 5. V I L = 5. ma to 4 ma = 1 V = 5. V I L = 5. ma to 1 ma RR, RIPPLE REJECTION (db) I L = 1 ma f = 12 Hz = 1 V = 14 V to 24 V Without C Adj = 1 F Without C Adj Figure 7. Load Regulation Figure 8. Ripple Rejection I out, OUTPUT CURRENT (A) T J = 125 C T J = 25 C VinVout, INPUTOUTPUT VOLTAGE DIFFERENTIAL (V) I L = 1 ma I L = 5 ma , INPUTOUTPUT VOLTAGE DIFFERENTIAL (V) Figure 9. Current Limit Figure 1. Dropout Voltage 5. 1 I B, QUIESCENT CURRENT (ma) T J = 25 C T J = 125 C RR, RIPPLE REJECTION (db) I L = 4 ma = 5. V ± 1. V PP = 1.25 V , INPUTOUTPUT VOLTAGE DIFFERENTIAL (Vdc) Figure 11. Minimum Operating Current k 1 k 1 k 1. M f, FREQUENCY (Hz) Figure 12. Ripple Rejection versus Frequency 6

7 V ref, REFERENCE VOLTAGE (V) = 4.2 V = V ref I L = 5. ma IAdj, ADJUSTMENT PIN CURRENT ( μ A) = 6.25 V = V ref МММ I L = 1 ma ММММI L = 1 ma Figure 13. Temperature Stability Figure 14. ment Pin Current Δ, OUTPUT VOLTAGE CHANGE (%) = 4.25 V to V = V ref I L = 5. ma NOISE VOLTAGE ( μ V) Bandwidth 1 Hz to 1 khz Figure 15. Line Regulation Figure 16. Output Noise Δ, OUTPUT VOLTAGE DEVIATION (V) Δ, INPUT VOLTAGE CHANGE (V) = 1 V I L = 5 ma T J = 25 C C L = 1. F C L = t, TIME ( s) Δ, OUTPUT VOLTAGE DEVIATION (V) I L, LOAD CURRENT (A) CL = 1. F; CAdj = 1 F C L =.3 F; C Adj = 1 F = 15 V = 1 V I NL = 5 ma T J = 25 C t, TIME ( s) I L Figure 17. Line Transient Response Figure 18. Load Transient Response 7

8 APPLICATIONS INFORMATION Basic Circuit Operation The is a threeterminal floating regulator. In operation, the develops and maintains a nominal 1.25 V reference (V ref ) between its output and adjustment terminals. This reference voltage is converted to a programming current (I PROG ) by R 1 (see Figure 19), and this constant current flows through to ground. The regulated output voltage is given by: Vout Vref 1 R1 IAdj R2 Since the current from the terminal (I Adj ) represents an error term in the equation, the was designed to control I Adj to less than 1 A and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. V ref R 1 I PROG External Capacitors A.1 F disc or 1. F tantalum input bypass capacitor (C in ) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (C Adj ) prevents ripple from being amplified as the output voltage is increased. A 1 F capacitor should improve ripple rejection about 15 db at 12 Hz in a 1 V application. Although the is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance (C O ) in the form of a 1. F tantalum or 25 F aluminum electrolytic capacitor on the output swamps this effect and insures stability. Protection Diodes When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Figure 2 shows the with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (C O > 25 F, C Adj > 5. F). Diode D 1 prevents C O from discharging thru the IC during an input short circuit. Diode D 2 protects against capacitor C Adj discharging through the IC during an output short circuit. The combination of diodes D 1 and D 2 prevents C Adj from discharging through the IC during an input short circuit. I Adj D 1 1N42 V ref = 1.25 V Typical Figure 19. Basic Circuit Configuration Load Regulation The is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R 1 ) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of can be returned near the load ground to provide remote ground sensing and improve load regulation. C in R 1 C O D2 C Adj 1N42 Figure 2. Voltage Regulator with Protection Diodes 8

9 25V R 1 V O 1.25k I O D 1 * To provide current limiting of I O to the system ground, the source of the current limiting diode must be tied to a negative voltage below 7.25 V. R 1 = V ref I DSS V ref I Omax I DSS 5 1N5314 V SS * D1 1N914 D2 1N914 1N MPS k 1. F Minimum = 1.25 V TTL Control V O < P OV 1.25 V V SS I Lmin I P < I O < 5 ma I P As shown O < I O < 495 ma Figure 21. able Current Limiter D 1 protects the device during an input short circuit. Figure V Electronic Shutdown Regulator 24 1N41 R 1 I out 5k I Adj MPS297 1 F I outmax = V ref I Adj 1.25 V R 1 R 1 5. ma < I out < 1 ma Figure 23. Slow TurnOn Regulator Figure 24. Current Regulator R θ JA, THERMAL RESISTANCE, JUNCTIONTOAIR ( C/W) Free Air Mounted Vertically Minimum Size Pad P D(max) for T A = 5 C 2. oz. Copper L 5.4 R JA L, LENGTH OF COPPER (mm) L ÎÎÎ ÎÎÎ Figure 25. Thermal Resistance and Maximum Power Dissipation versus PCB Copper Length Free Air Mounted Vertically Minimum Size Pad P D(max) for T A = 5 C 2. oz. Copper L ÎÎÎÎ 8.42 R JA L, LENGTH OF COPPER (mm) Figure 26. SOT223 Thermal Resistance and Maximum Power Dissipation versus PCB Copper Length L.63 ÎÎÎÎ 9

10 ORDERING INFORMATION Device ABDT ABDTG Output Voltage Tolerance Operating Temperature Range Package Shipping (PbFree) 75 Units / Rail 75 Units / Rail ABDTRK 25 / Tape & Reel ABDTRKG T J = 4 C to 125 C 25 / Tape & Reel (PbFree) 2% ABT TO22 5 Units / Rail ABTG TO22 (PbFree) 5 Units / Rail ADTRK 25 / Tape & Reel ADTRKG T J = C to 125 C (PbFree) 25 / Tape & Reel BDT 75 Units / Rail BDTG (PbFree) 75 Units / Rail BDTRK 25 / Tape & Reel BDTRKG 25 / Tape & Reel (PbFree) BSTT3 T J = 4 C to 125 C SOT223 4 / Tape & Reel BSTT3G 4% SOT223 (PbFree) 4 / Tape & Reel BT TO22 5 Units / Rail BTG DT DTG TO22 (PbFree) 5 Units / Rail DTRKG 25 / Tape & Reel (PbFree) T J = C to 125 C STT3 SOT223 4 / Tape & Reel (PbFree) 75 Units / Rail 75 Units / Rail DTRK 25 / Tape & Reel STT3G SOT223 (PbFree) 4 / Tape & Reel T TO22 5 Units / Rail TG TO22 (PbFree) 5 Units / Rail For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD811/D. 1

11 MARKING DIAGRAMS DT SUFFIX CASE 369C 317ABG ALYWW 317MAG ALYWW 317MBG ALYWW 317MG ALYWW TO22 T SUFFIX CASE 221A SOT223 ST SUFFIX CASE 318E LM 317MABT AWLYWWG LM 317MBT AWLYWWG LM 317MT AWLYWWG AYW 317MB AYW 317M A = Assembly Location L, WL = Wafer Lot Y = Year WW, W = Work Week G or = PbFree Package (Note: Microdot may be in either location) 11

12 PACKAGE DIMENSIONS H Q Z L V G 4 B N D A K F TO22, SINGLE GAUGE T SUFFIX PLASTIC PACKAGE CASE 221AB1 ISSUE O T U S R J C T SEATING PLANE DT SUFFIX PLASTIC PACKAGE CASE 369C1 ISSUE O NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, CONTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. INCHES MILLIMETERS DIM MIN MAX MIN MAX A B C D F G H J K L N Q R S T U V Z B C T SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, CONTROLLING DIMENSION: INCH. V S F R G L A K D 2 PL J H.13 (.5) M T E U Z INCHES MILLIMETERS DIM MIN MAX MIN MAX A B C D E F G.18 BSC 4.58 BSC H J K L.9 BSC 2.29 BSC R S U.2 1 V Z SOLDERING FOOTPRINT* SCALE 3:1 *For additional information on our PbFree strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. mm inches 12

13 PACKAGE DIMENSIONS SOT223 ST SUFFIX PLASTIC PACKAGE CASE 318E4 ISSUE L D b1 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, CONTROLLING DIMENSION: INCH..8 (3) H E e1 A1 e b E A L1 C MILLIMETERS INCHES DIM MIN NOM MAX MIN NOM MAX A A b b c D E e e L H E SOLDERING FOOTPRINT* SCALE 6:1 mm inches *For additional information on our PbFree strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 8217 USA Phone: or Toll Free USA/Canada Fax: or Toll Free USA/Canada orderlit@onsemi.com N. American Technical Support: Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: Japan Customer Focus Center Phone: ON Semiconductor Website: Order Literature: For additional information, please contact your local Sales Representative /D