Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 General Description Features The AS431 is a three-terminal adjustable shunt regulator with guaranteed thermal stability over a full operation range. It features sharp turn-on characteristics, low temperature coefficient and low output impedance, which make it ideal substitute for Zener diode in applications such as switching power supply, charger and other adjustable regulators. * The output voltage of AS431 can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage (36V). The AS431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%. This IC is available in 4 packages: TO-92 (bulk or ammo packing), SOT-23, SOT-23-5 and SOT-89. SOT-89 * * * * * * Programmable Precise Output Voltage from 2.5V to 36V High Stability under Capacitive Load Low Temperature Deviation: 4.5mV Typical Low Equivalent Full-range Temperature Coefficient with 20PPM/oC Typical Sink Current Capacity from 1mA to 100mA Low Output Noise Wide Operating Range of -40 to 125oC Applications * * * * * Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference TO-92(Bulk Packing) TO-92(Ammo Packing) SOT-23-5 SOT-23 Figure 1. Package Types of AS431 BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 1 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Pin Configuration N Package (SOT-23) R Package (SOT-89) K Package (SOT-23-5) ANODE 3 NC 1 * 2 CATHODE 3 (Note 1) 1 REF 1 2 2 3 5 4 ANODE REF REF ANODE CATHODE CATHODE Note 1: * Pin 2 is attached to substrate and must be connected to ANODE or open Z Package (TO-92(Ammo Packing)) Z Package (TO-92(Bulk Packing)) 3 CATHODE ANODE 2 ANODE REF 1 REF 3 CATHODE 2 1 Figure 2. Pin Configuration of AS431 (Top View) Functional Block Diagram CATHODE + REF - VREF ANODE Figure 3. Functional Block Diagram of AS431 BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 2 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Ordering Information AS431 Circuit Type E1: Lead Free G1: Green Voltage Tolerance A: 0.5% B: 1.0% TR: Tape and Reel or Ammo Blank: Bulk Package N: SOT-23 R: SOT-89 Package Temperature Range SOT-23 -40 to 125oC SOT-23-5 -40 to 125oC TO-92 SOT-89 - -40 to 125oC -40 to 125oC K: SOT-23-5 Z: TO-92 Voltage Tolerance Part Number Lead Free Marking ID Green Lead Free Green Packing Type 0.5% AS431ANTR-E1 AS431ANTR-G1 EB5 GB5 Tape & Reel 1.0% AS431BNTR-E1 AS431BNTR-G1 EB6 GB6 Tape & Reel 0.5% AS431AKTR-E1 AS431AKTR-G1 E6H G6H Tape & Reel 1.0% AS431BKTR-E1 AS431BKTR-G1 E6I G6I Tape & Reel 0.5% AS431AZ-E1 AS431AZ-G1 AS431AZ-E1 AS431AZ-G1 Bulk 0.5% AS431AZTR-E1 AS431AZTR-G1 AS431AZ-E1 AS431AZ-G1 Ammo 1.0% AS431BZ-E1 AS431BZ-G1 AS431BZ-E1 AS431BZ-G1 Bulk 1.0% AS431BZTR-E1 AS431BZTR-G1 AS431BZ-E1 AS431BZ-G1 Ammo 0.5% AS431ARTR-E1 AS431ARTR-G1 E43G G43G Tape & Reel 1.0% AS431BRTR-E1 AS431BRTR-G1 E43H G43H Tape & Reel BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with "G1" suffix are available in green packages. BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 3 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Absolute Maximum Ratings (Note 2) Parameter Symbol Value Unit Cathode Voltage VKA 40 V Cathode Current Range (Continuous) IKA -100 to 150 mA Reference Input Current Range IREF 10 mA PD Power Dissipation Z, R Package: 770 mW N, K Package: 370 TJ 150 oC Storage Temperature Range TSTG -65 to 150 oC ESD (Human Body Model) ESD 2000 V Junction Temperature Note 2: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Cathode Voltage VKA VREF 36 V Cathode Current IKA 1.0 100 mA Operating Ambient Temperature Range TA -40 125 o C BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 4 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Electrical Characteristics Operating Conditions: TA=25oC, unless otherwise specified. Parameter Reference Voltage 0.5% 1.0% Deviation of Reference Voltage Over Full Temperature Range Test Circuit Symbol 4 VREF 4 VREF Conditions Min Typ Max 2.487 2.500 2.512 2.475 2.500 2.525 4.5 8 4.5 10 -40 to 125oC 4.5 16 VKA= 10V to VREF -1.0 -2.7 VKA= 36V to 10V -0.5 -2.0 0.7 4 A 0.4 1.2 A VKA=VREF, IKA=10mA VKA=VREF IKA= 10mA 0 to 70oC -40 to 85oC Unit V mV Ratio of Change in Reference Voltage to the Change in Cathode Voltage 5 Reference Current 5 IREF Deviation of Reference Current Over Full Temperature Range 5 IREF Minimum Cathode Current for Regulation 4 IKA (Min) VKA=VREF 0.4 1.0 mA Off-state Cathode Current 6 IKA (Off) VKA=36V, VREF=0 0.05 1.0 A Dynamic Impedance 4 ZKA VKA=VREF, IKA=1 to 100mA, f 1.0KHz 0.15 0.5 SOT-23 135.9 SOT-23-5 135.9 TO-92 81.9 SOT-89 29.8 Thermal Resistance VREF VKA JC IKA=10mA IKA=10mA,R1=10K, R2= IKA=10mA, R1=10K R2=, TA=-40 to 125oC Dec. 2012 Rev. 2. 6 mV/V o C/W BCD Semiconductor Manufacturing Limited 5 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Electrical Characteristics (Continued) R1 VKA VIN IKA VREF Figure 4. Test Circuit 4 for VKA=VREF R3 VIN VKA IKA R1 IREF VKA=VREF(1+R1/R2)+ IREF*R1 R2 VREF Figure 5. Test Circuit 5 for VKA>VREF VKA VIN IOFF Figure 6. Test Circuit 6 for IOFF BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 6 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Typical Performance Characteristics 1.5 2.510 VKA = VREF Reference Current (A) Reference Voltage (V) R1=10K,R2=Infinite IKA = 10mA 2.505 2.500 2.495 IKA=10mA 1.0 0.5 2.490 2.485 -60 -40 -20 0 20 40 60 80 100 120 0.0 -60 140 -40 -20 0 o 60 80 100 120 140 Figure 8. Reference Current vs. Ambient Temperature 800 VKA=VREF VKA=VREF 0 TA=25 C 0 TA=25 C 600 100 Cathode Current (A) Cathode Current (mA) 40 Ambient Temperature ( C) Figure 7. Reference Voltage vs. Ambient Temperature 150 20 0 Ambient Temperature ( C) 50 0 400 200 0 -50 -200 -100 -2 -1 0 1 2 -1.0 3 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 Cathode Voltage (V) Cathode Voltage (V) Figure 9. Cathode Current vs. Cathode Voltage Figure 10. Cathode Current vs. Cathode Voltage Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited 7 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Typical Performance Characteristics (Continued) 1.8 VKA=36V 1.6 VREF=0 -0.9 VKA=3.5V to 36V -1.0 1.4 VREF / VKA (mV/V) Off-State Cathode Current (A) 2.0 1.2 1.0 0.8 0.6 0.4 -1.1 -1.2 -1.3 0.2 0.0 -1.4 -40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 o o Ambient Temperature ( C) Ambient Temperature ( C) Figure 11. Off-State Cathode Current vs. Ambient Temperature Figure 12. Ratio of Delta Reference Voltage to the Ratio of Delta Cathode Voltage Output 70 TA=25 C I KA 242 IKA=10mA 50 Voltage Gain (dB) 15K 0 60 10F 40 30 20 10 8.2K 0 -10 1k 10k 100k 1M GND Small Signal Frequency (Hz) Figure 13. Small Signal Voltage Gain vs. Frequency BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 8 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Typical Performance Characteristics (Continued) Output IKA=10mA 1K Reference Impedance () o 10 TA=25 C IKA 50 1 GND 0.1 1K 10K 100K 1,000K Frequency (Hz) Figure 14. Reference Impedance vs. Frequency 100 90 Cathode Current (mA) 80 R1 (10K) 70 60 150 IKA Stable Stable 50 o TA=25 C 40 VKA=VREF 30 VKA=10V:No oscillation 10 0 0.001 R2 VKA= 5V:No oscillation 20 VKA=15V:No oscillation 0.01 0.1 1 10 Load Capacitance (F) Figure 15. Stability Boundary Conditions vs. Load Capacitance Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited 9 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Typical Performance Characteristics (Continued) 5 Input and Output Voltage (V) Input Output 4 220 Pulse Generator f=100KHz 3 Output 2 50 1 0 GND 0 2 4 6 Time (S) Figure 16. Pulse Response of Input and Output Voltage BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 10 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Typical Application R3 V OUT VIN R1 VOUT=(1+R1/R2)*VREF V REF AS431 R2 Figure 17. Shunt Regulator VIN R1 VOUT R4 VOUT=(1+R2/R3)*VREF R2 VREF AS431 R3 Figure 18. High Current Shunt Regulator R2 V IN I OUT IOUT=VREF/R2 + IKA R1 AS431 Figure 19. Current Source or Current Limit Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited 11 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Typical Application (Continued) VIN VOUT AZ1117 R1 8.2K Adjust R2 250 5V, 1A AS431 R3 250 Figure 20. Precision 5V 1A Regulator R3 C1 R4 VOUT R2 680 R5 R1 U2 Q1 3 COMP C2 2 AS431 PWM Controller VFB 4 PS521 Figure 21. PWM Converter with Reference BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 12 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Mechanical Dimensions TO-92(Bulk Packing) Unit: mm(inch) 1.000(0. 039) 3.430(0. 135) MIN 3.700(0.146) 3.300(0.130) 1.400(0. 055) 0.320(0. 013) 0.510(0. 020) 0. 000(0. 000) 0. 380(0. 015) 1. 600(0. 063) MAX 4.700(0.185) 1.270(0. 050) TYP 15.500(0.610) 0.360(0. 014) 0.760(0. 030) 12.500(0.492) 4.300(0.169) 4.400(0. 173) 4.800(0. 189) 2.420(0.095) 2.660(0.105) Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited 13 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Mechanical Dimensions (Continued) TO-92(Ammo Packing) Unit: mm(inch) 1. 100(0. 043) 3. 430(0.135) MIN 1.270(0.050) Typ 2.500(0.098) 4.000 (0.157 ) 0. 000(0.000) 0. 380(0.015) 1. 600(0. 063) MAX 14.500(0.571) 12.500(0.492) 0.320(0. 013) 0. 510(0. 020) 3.800(0.150) 3.300(0.130) 1. 400(0.055) 4.700(0.185) 4.300(0.169) 4.400(0.173) 4.800 (0.189 ) 13.000(0. 512) 15.000 (0.591 ) 0.380(0.015) 0.550(0.022 ) 2.540(0.100) Typ BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 14 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Mechanical Dimensions (Continued) SOT-23 3.0 2.0 1.050(0.041)REF 7.0 R0.100(0.004) 0.900(0.035) 1.100(0.043) 0.0~10.0 0.020(0.001) 0.100(0.004) 0.200(0.008)MIN 2.800(0.110) 3.000(0.118) 0.550(0.022)REF 7.0 0.080(0.003) 0.150(0.006) 1.200(0.047) 1.400(0.055) 2.300(0.091) 2.500(0.098) 0.920(0.036) 0.980(0.039) 0.100(0.004) GAUGE PLANE 4xR0.100(0.004) 0.500(0.020) 0.700(0.028) Unit: mm(inch) 0.300(0.012) 0.500(0.020) 1.900(0.075)REF Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited 15 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Mechanical Dimensions (Continued) SOT-23-5 Unit: mm(inch) 0.300(0.012) 0.600(0.024) 1.500(0.059) 1.700(0.067) 0.100(0.004) 0.200(0.008) 2.950(0.116) 2.650(0.104) 2.820(0.111) 3.020(0.119) 0.200(0.008) 0.700(0.028) REF 0.300(0.012) 0.400(0.016) 0 8 1.800(0.071) 2.000(0.079) 0.000(0.000) MAX 1.450(0.057) 0.950(0.037) TYP 0.150(0.006) 0.900(0.035) 1.300(0.051) BCD Semiconductor Manufacturing Limited Dec. 2012 Rev. 2. 6 16 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AS431 Mechanical Dimensions (Continued) SOT-89 1.550(0.061)REF Unit: mm(inch) 4.400(0.173) 4.600(0.181) 1.400(0.055) 1.600(0.063) 1.030(0.041)REF 45 2.300(0.091) 2.600(0.102) 3.950(0.156) 4.250(0.167) 2.060(0.081)REF 3 0.900(0.035) 1.100(0.043) 0.320(0.013) 0.520(0.020) 0.480(0.019) 0.320(0.013) 0.520(0.020) 10 0.350(0.014) 0.450(0.018) 3.000(0.118) TYP 1.500(0.059) 1.800(0.071) 0.320(0.013)REF 3 2.210(0.087)REF 1.620(0.064)REF R0.150(0.006) 10 Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited 17 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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