LM431SA, LM431SB, LM431SC. Programmable Shunt Regulator

Transcription

1 A, B, C Programmable Shunt Regulator Description The A / B / C are three terminal the output adjustable regulators with thermal stability over operating temperature range. The output voltage can be set any value between V REF (approximately 2.5 V) and 6 V with two external resistors. These devices have a typical dynamic output impedance of.2. Active output circuit provides a sharp turn on characteristic, making these devices excellent replacement for zener diodes in many applications. Features Programmable Output Voltage to 6 V Low Dynamic Output Impedance:.2 (Typical) Sink Current Capability: 1. to 1 ma Equivalent Full Range Temperature Coefficient of 5 ppm/ C (Typical) Temperature Compensated for Operation Over Full Rated Operating Temperature Range Low Output Noise Voltage Fast Turn on Response These Devices are Pb Free, Halogen Free/BFR Free and are RoHS Compliant ORDERING INFORMATION 1 SOT 89 CASE 528AH 1 2 SOT 2FL CASE 419BD 1 2 SOT 2 CASE 18BM 1. Ref 2. Anode. Cathode 1. Cathode 2. Ref. Anode M2 1. Ref 2. Cathode. Anode M 1. Cathode 2. Ref. Anode Product Number Output Voltage Tolerance Operating Temperature Top Mark (1) Package Shipping ACMFX 2% 25 to +85 C 4A SOT 2FL L Tape and Reel ACMX 4L SOT 2 L ACM2X 4G SOT 2 L BCMLX 1% 4B SOT 89 L BCMFX 4B SOT 2FL L BCMX 4M SOT 2 L BCM2X 4H SOT 2 L CCMLX.5% 4C SOT 89 L CCMFX 4C SOT 2FL L CCMX 4N SOT 2 L CCM2X 4J SOT 2 L AIMFX 2% 4 to +85 C 4AI SOT 2FL L BIMFX 1% 4BI SOT 2FL L CIMFX.5% 4CI SOT 2FL L 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. SOT 2 and SOT 2FL have basically four character marking except AIMFX. ( letters for device code + 1 letter for date code) SOT 2FL date code is composed of 1 digit numeric or alphabetic week code adding bar type year code. Semiconductor Components Industries, LLC, 218 July, 218 Rev. 8 1 Publication Order Number: A/D

2 Block Diagram Figure 1. Block Diagram Thermal Resistance Junction Air (2, ) ABSOLUTE MAXIMUM RATINGS (T A = 25 C unless otherwise noted) Symbol Parameter Value Unit V KA Cathode Voltage 7 V I KA Cathode current Range (Continuous) 1 to +15 ma I REF Reference Input Current Range.5 to +1. ma R θja ML Suffix Package (SOT 89) 22 C/W MF Suffix Package (SOT 2FL) 5 M2, M Suffix Package (SOT 2) 4 P D Power Dissipation (4, 5) ML Suffix Package (SOT 89) 56 mw MF Suffix Package (SOT 2FL) 5 M2, M Suffix Package (SOT 2) 1 T J Junction Temperature 15 C T OPR Operating Temperature Range All products except AIMFX 25 to +85 AIMFX, SBIMFX, SCIMFX 4 to +85 T STG Storage Temperature Range 65 to +15 C Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 2. Thermal resistance test board Size: 1.6 mm x 76.2 mm x 114. mm (1SP) JEDEC Standard: JESD51, JESD Assume no ambient airflow. 4. T JMAX = 15 C; ratings apply to ambient temperature at 25 C. 5. Power dissipation calculation: P D = (T J T A ) / R θja. C RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min. Max. Unit V KA Cathode Voltage V REF 6 V I KA Cathode Current 1 1 ma Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. 2

3 ELECTRICAL CHARACTERISTICS (Note 6, Values are at T A = 25 C unless otherwise noted) A B C Symbol Parameter Conditions Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit VREF Reference Input Voltage V KA = V REF, I KA = 1 ma V V REF / T Deviation of Reference Input Voltage Over Temperature VKA = VREF, I KA = 1 ma TMIN TA TMAX SOT 89 SOT 2FL mv SOT mv V REF / V KA Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage I KA =1 ma V KA = 1 V V REF V KA = 6 V 1 V mv/v IREF Reference Input Current I KA = 1 ma, R 1 = 1 K, R 2 = μa I REF / T Deviation of Reference Input Current Over Full Temperature Range I KA = 1 ma, R 1 = 1 K, R 2 =, T A = Full Range SOT 89 SOT 2FL μa SOT μa IKA(MIN) Minimum Cathode Current for Regulation VKA = VREF ma IKA(OFF) Off Stage Cathode Current V KA = 6 V, V REF = μa ZKA Dynamic Impedance VKA = VREF, I KA = 1 to 1 ma, f 1. khz Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 6. AI, BI, CI: T A(min) = 4 C, T A(max) = +85 C All other pins: T A(min) = 25 C, T A(max) = +85 C

4 ELECTRICAL CHARACTERISTICS (Continued) (Notes 7 and 8, Values are at T A = 25 C unless otherwise noted) Symbol Parameter Conditions V REF Reference Input Voltage AI BI CI Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. V KA = V REF, I KA = 1 ma V Unit V REF(dev) Deviation of Reference Input Voltage Over Temperature V KA = V REF, I KA = 1 ma, TMIN TA TMAX mv V REF / V KA I REF Ratio of Change in Reference Input Voltage to Change in Cathode Voltage Reference Input Current V KA = 1 V V REF I KA = 1 ma mv/v V KA = 6 V 1 V I KA = 1 ma, R 1 =1 K, R 2 = μa I REF(dev) Deviation of Reference Input Current I KA = 1 ma, R 1 = 1 K, R 2 =, Over Full Temperature TMIN TA TMAX Range μa I KA(MIN) Minimum Cathode Current for Regulation VKA = VREF ma I KA(OFF) Off Stage Cathode Current V KA = 6 V, V REF = μa ZKA Dynamic Impedance V KA = V REF, I KA = 1 to 1 ma, f 1. khz AI, BI, CI: T A(min) = 4 C, T A(max) = +85 C All other pins: T A(min) = 25 C, T A(max) = +85 C 8. The deviation parameters V REF(dev) and I REF(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full range temperature coefficient of the reference input voltage, αv REF, is defined as: V REF(min) V REF ppm C V REF(dev) V REF (at 25 C) 1 6 T MAX T MIN where T MAX T MIN is the rated operating free air temperature range of the device. V REF can be positive or negative, depending on whether minimum V REF or maximum V REF, respectively, occurs at the lower temperature. V REF(max) TMAX -TMIN V REF(dev) Example: V REF(dev) = 4.5 mv, V REF = 25 mv at 25 C, T MAX T MIN = 125 C for AI. V REF 4.5 mv 25 mv C 14.4 ppm C Because minimum V REF occurs at the lower temperature, the coefficient is positive. 4

5 TEST CIRCUITS Figure 2. Test Circuit for V KA = V REF Figure. Test Circuit for V KA V REF Figure 4. Test Circuit for I KA(OFF) 5

6 TYPICAL APPLICATIONS V O 1 R 1 R 2 V ref V O 1 R 1 R 2 V ref LM785/MC785 Figure 5. Shunt Regulator Figure 6. Output Control for Three Terminal Fixed Regulator V O 1 R 1 R 2 V ref Figure 7. High Current Shunt Regulator Figure 8. Current Limit or Current Source Figure 9. Constant Current Sink 6

7 TYPICAL PERFORMANCE CHARACTERISTICS I K Cathode Current (ma) I K, Cathode Current (ma) V KA = V REF T A = 25 C V KA, Cathode Voltage (V) V KA Cathode Voltage (V) Figure 1. Cathode Current vs. Cathode Voltage I K Cathode Current ( A) 8 V KA = V REF 6 T A = 25 C I KA(MIN) V KA Cathode Voltage (V) Figure 11. Cathode Current vs. Cathode Voltage I off Off State Cathode Current ( A) I off o T T A, C) ( A Ambient Temperature ( C) Figure 12. OFF State Cathode Current vs. Ambient Temperature I ref Reference Input Current ( A) T A Ambient Temperature ( C) Figure 1. Reference Input Current vs. Ambient Temperature Open Loop Voltage Gain (db) T A = 25 C I KA = 1 ma 1 1k 1k 1k 1M 1M Frequency (Hz) Frequency (Hz) Figure 14. Frequency vs. Small Signal Voltage Amplification Voltage Swing (V) 6 5 INPUT T A = 25 C 4 OUTPUT Time ( s) Figure 15. Pulse Response 7

8 5 14 I K Cathode Current (ma) A B A. V KA = Vref B. V KA = 5. I K = 1 ma T A = 25 C Current (ma) p 1n 1n 1n 1? 1? C L Load Capacitance Figure 16. Stability Boundary Conditions Anode Ref. Voltage(V) (V) Figure 17. Anode Reference Diode Curve Current (ma) Cu rrent(ma) V ref Reference Input Voltage (V) Voltage(V) Ref. Cathode Voltage (V) Figure 18. Reference Cathode Diode Curve T A Ambient Temperature ( C) Figure 19. Reference Input Voltage vs. Ambient Temperature 8

9 PACKAGE DIMENSIONS SOT 2 CASE 18BM ISSUE O 9

10 PACKAGE DIMENSIONS SOT 2FL CASE 419BD ISSUE O 1

11 PACKAGE DIMENSIONS SOT 89 LEAD CASE 528AH ISSUE O C C A B. X 45.5 X MIN C C.52. (2X) C.1 M C A B 5. MIN.9 MIN 2X C L SYMM 2. MIN.96 MIN C 1.5. MIN LAND PATTERN RECOMMENDATION.5 C SEATING PLANE.6.4 C NOTES: UNLESS OTHERWISE SPECIFIED. A. REFERENCE TO JEDEC TO-24 VARIATION AA. B. ALL DIMENSIONS ARE IN MILLIMETERS. C DOES NOT COMPLY JEDEC STANDARD VALUE. D. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH AND TIE BAR PROTRUSION. E. DIMENSION AND TOLERANCE AS PER ASME Y

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