Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS General Description Features The AZ431-B 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 AZ431-B can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage. · · · · · · AZ431-B Programmable Precise Output Voltage from 2.5V to 18V 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 The AZ431-B precision reference is offered in two voltage tolerance: 0.4% and 0.8%. This IC is available in 5 packages: TO-92 (bulk or ammo packing), SOT-23, SOT-23-5, SOT-89-3 and SOIC-8. · · · · · SOIC-8 SOT-89-3 SOT-23 SOT-23-5 Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference TO-92 TO-92 Ammo Packing Figure 1. Package Types of AZ431-B Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 1 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Pin Configuration R Package (SOT-89-3) N Package (SOT-23) M Package (SOIC-8) ANODE CATHODE 1 8 REF ANODE 2 7 ANODE ANODE 3 6 ANODE NC 4 5 NC 3 REF CATHODE REF 3 CATHODE 3 CATHODE 2 ANODE 2 ANODE 1 REF 1 REF 3 ANODE CATHODE K Package (SOT-23-5) Z Package (TO-92 Ammo Packing) Z Package (TO-92) 2 1 2 1 NC 1 NC 2 CATHODE 3 5 ANODE 4 REF Figure 2. Pin Configuration of AZ431-B (Top View) Functional Block Diagram CATHODE + REF - VREF ANODE Figure 3. Functional Block Diagram of AZ431-B Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 2 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Ordering Information AZ431 E1: Lead Free Circuit Type Blank: Tin Lead Voltage Tolerance A: 0.4% B: 0.8% TR: Tape and Reel or Ammo Package B: AZ431-B (20V) Blank: Tube or Bulk M: SOIC-8 Z: TO-92 N: SOT-23 K: SOT-23-5 R: SOT-89-3 Package Temperature Range SOT-23 -40 to 125oC SOT-23-5 -40 to 125oC TO-92 SOIC-8 SOT-89-3 -40 to 125oC -40 to 125oC -40 to 125oC Voltage Tolerance Part Number Tin Lead Lead Free Marking ID Tin Lead Lead Free Packing Type 0.4% AZ431AN-BTRE1 EA4 Tape & Reel 0.8% AZ431BN-BTRE1 EA5 Tape & Reel 0.4% AZ431AK-BTR AZ431AK-BTRE1 K4A E4A Tape & Reel 0.8% AZ431BK-BTR AZ431BK-BTRE1 K4B E4B Tape & Reel 0.4% AZ431AZ-B AZ431AZ-BE1 AZ431AZ-B AZ431AZ-BE1 Bulk 0.4% AZ431AZ-BTR AZ431AZ-BTRE1 AZ431AZ-B AZ431AZ-BE1 Ammo 0.8% AZ431BZ-B AZ431BZ-BE1 AZ431BZ-B AZ431BZ-BE1 Bulk 0.8% AZ431BZ-BTR AZ431BZ-BTRE1 AZ431BZ-B AZ431BZ-BE1 Ammo 0.4% AZ431AM-B AZ431AM-BE1 AZ431AM-B AZ431AM-BE1 Tube 0.4% AZ431AM-BTR AZ431AM-BTRE1 AZ431AM-B AZ431AM-BE1 Tape & Reel 0.8% AZ431BM-B AZ431BM-BE1 AZ431BM-B AZ431BM-BE1 Tube 0.8% AZ431BM-BTR AZ431BM-BTRE1 AZ431BM-B AZ431BM-BE1 Tape & Reel 0.4% AZ431AR-BTR AZ431AR-BTRE1 431C E43C Tape & Reel 0.8% AZ431BR-BTR AZ431BR-BTRE1 431D E43D Tape & Reel BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 3 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Cathode Voltage VKA 20 V Cathode Current Range (Continuous) IKA -100 to 150 mA Reference Input Current Range IREF 10 mA M, Z, R Package: 770 PD Power Dissipation 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 1: 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 18 V Cathode Current IKA 1.0 100 mA Operating Ambient Temperature Range TA -40 125 oC Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 4 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Electrical Characteristics Operating Conditions: TA=25oC, unless otherwise specified. Parameter Reference Voltage 0.4% 0.8% Deviation of Reference Voltage Over Full Temperature Range Test Circuit Symbol 4 VREF 4 ∆VREF Conditions Min Typ Max 2.490 2.500 2.510 2.480 2.500 2.520 0 to 70oC 4.5 8 -40 to 85oC 4.5 10 -40 to 125oC 4.5 16 ∆VKA= 10V to VREF -1.0 -2.7 ∆VKA= 18V to 10V -0.5 -2.0 0.7 4 µA TA=-40 to 125oC 0.4 1.2 µA VKA=VREF, IKA=10mA VKA=VREF IKA= 10mA 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=18V, VREF=0 0.05 1.0 µA Dynamic Impedance 4 ZKA VKA=VREF, IKA=1 to 100mA f ≤ 1.0KHz 0.2 0.5 Ω ∆VREF ∆VKA IKA=10mA IKA=10mA, R1=10KΩ, R2=∞ IKA=10mA, R1=10KΩ, R2=∞ Mar. 2007 Rev. 2. 4 mV/ V BCD Semiconductor Manufacturing Limited 5 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B 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 Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 6 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Typical Performance Characteristics 1.5 2.510 VKA = VREF Reference Current (µA) 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 (µA) 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 Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 7 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Typical Performance Characteristics (Continued) 1.8 VKA=18V 1.6 VREF=0 -0.9 ∆VREF / ∆VKA (mV/V) Off-State Cathode Current (µA) 2.0 1.4 1.2 1.0 0.8 0.6 0.4 VKA=3.5V to 18V -1.0 -1.1 -1.2 -1.3 0.2 -1.4 0.0 -40 -20 0 20 40 60 80 100 -40 120 -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 0 TA=25 C 60 15K IKA=10mA Voltage Gain (dB) 50 I KA 242 10µF 40 30 20 8.2K 10 0 -10 1k 10k 100k GND 1M Small Signal Frequency (Hz) Figure 13. Small Signal Voltage Gain vs. Frequency Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 8 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Typical Performance Characteristics (Continued) Output IKA=10mA 1K Reference Impedance (Ω) o 10 TA=25 C IKA 50 1 GND 0.1 1K 10K 100K 1,000K Frequency (Hz) Figure 15. Reference Impedance vs. Frequency Cathode Current (mA) 20 18 VKA=10V:No oscillation 16 VKA=15V:No oscillation IKA 14 12 150 R1 (10K) Stable Stable 10 8 6 4 R2 VKA=VREF VKA=5V 2 0 0.01 0.1 1 10 Load Capacitance (µF) Figure 16. Stability Boundary Conditions vs. Load Capacitance Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 9 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Typical Performance Characteristics (Continued) 5 Input and Output Voltage (V) Input Output 4 220 Pulse Generator f=100KHz 3 Output 2 50 1 GND 0 0 2 4 6 Time (µS) Figure 18. Pulse Response of Input and Output Voltage Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 10 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Typical Application R3 V OUT VIN R1 VOUT=(1+R1/R2)*VREF V REF AZ431-B R2 Figure 19. Shunt Regulator VIN VOUT R1 R4 VOUT=(1+R2/R3)*VREF R2 VREF AZ431-B R3 Figure 20. High Current Shunt Regulator R2 V IN I OUT IOUT=VREF/R2 + IKA R1 AZ431-B Figure 21. Current Source or Current Limit Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 11 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Typical Application (Continued) VIN AZ1117 R1 8.2K VOUT Adjust 5V, 1A R2 250 AZ431-B R3 250 Figure 22. Precision 5V 1A Regulator R3 C1 R4 VOUT R2 680 R5 R1 U2 Q1 3 COMP C2 2 AZ431-B PWM Controller VFB 4 PS521 Figure 23. PWM Converter with Reference Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 12 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Mechanical Dimensions TO-92 Unit: mm(inch) 1.100(0.043) 3.430(0.135) MIN 3.700(0.146) 3.300(0.130) 1.400(0.055) 0.360(0.014) 0.510(0.020) 0.000(0.000) 0.380(0.015) Φ1.600(0.063) MAX 4.700(0.185) 0.380(0.015) 0.550(0.022) 14.100(0.555) 14.500(0.571) 4.300(0.169) 4.400(0.173) 4.700(0.185) 1.270(0.050) TYP 2.440(0.096) 2.640(0.104) Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 13 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Mechanical Dimensions (Continued) TO-92 Ammo Packing 12.400(0.488) 13.000(0.512) Unit: mm(inch) ±1.000(0.039) ±1.000(0.039) 4.400(0.173) 4.600(0.181) ΔP Δh 3.400(0.134) 3.600(0.142) 4.400(0.173) 4.600(0.181) 19.000(0.748) 21.000(0.827) 0.380(0.015) 0.550(0.022) 2.200(0.087) 2.800(0.110) 1.000 (0.039) MAX 15.500(0.610) 16.500(0.650) 5.500(0.217) 6.500(0.256) 2.500(0.098) MIN 3.800(0.150) 4.200(0.165) 17.500(0.689) 19.000(0.748) 2.200(0.087) 2.800(0.110) 6.050(0.238) 6.650(0.262) 8.500(0.335) 9.500(0.374) 3.550(0.140) 4.150(0.163) 12.500(0.492) 12.900(0.508) 0.150(0.006) 0.250(0.010) 0.350(0.014) 0.450(0.018) Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 14 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Mechanical Dimensions (Continued) SOT-23 Mar. 2007 Rev. 2. 4 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 15 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B 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) 1.250(0.049) 1.050(0.041) 0.950(0.037) TYP 0.000(0.000) 0.100(0.004) 1.050(0.041) 1.150(0.045) Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 16 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Mechanical Dimensions (Continued) SOT-89-3 Unit: mm(inch) 4.400(0.173) 4.600(0.181) 1.630(0.064) 1.400(0.055) 1.600(0.063) 1.830(0.072) 0.000(0.000) 0.076(0.003) 1.400(0.055)* 1.200(0.047) 0.900(0.035) 3.950(0.156) 4.250(0.167) R0.200(0.008) 2.300(0.091) 2.600(0.102) 3° 10° 0.360(0.014) 0.360(0.014) 0.360(0.014) 0.520(0.020) 0.480(0.019) 0.440(0.017) 0.440(0.017) 3.000(0.118) 0.560(0.022) 3° 10° R0.150(0.006) Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 17 Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B Mechanical Dimensions (Continued) SOIC-8 4.700(0.185) 5.100(0.201) 7° Unit: mm(inch) 0.320(0.013) 1.350(0.053) 1.750(0.069) 8° 8° 7° 0.675(0.027) 0.725(0.029) D 5.800(0.228) 1.270(0.050) 6.200(0.244) TYP D 20:1 φ 0.800(0.031) 0.300(0.012) R0.150(0.006) 0.100(0.004) 0.200(0.008) 0° 8° 1.000(0.039) 3.800(0.150) 4.000(0.157) 0.330(0.013) 0.190(0.007) 0.250(0.010) 1° 5° 0.510(0.020) 0.900(0.035) R0.150(0.006) 0.450(0.017) 0.800(0.031) Mar. 2007 Rev. 2. 4 BCD Semiconductor Manufacturing Limited 18 http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. 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