Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR General Description Features The AS431I 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. y y y y y y y The output voltage of AS431I can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage (36V). AS431I Programmable Precise Output Voltage from 2.5V to 36V High Stability Under Capacitive Load Low Minimum Cathode Current for Regulation: 10µA (Typ.), 50µA (Max.) Low Temperature Deviation: 4.5mV Typical Sink Current Capacity from 50µ A to 100mA Low Output Noise Wide Operating Range: -40℃ to 125℃ Applications The AS431I is offered in two grade initial voltage tolerance at 25℃, 0.5%, and 1%. y y y y y This IC is available in 3 packages: TO-92 (bulk or ammo packing), SOT-23 and SOT-89. TO-92(Bulk Packing) Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference TO-92(Ammo Packing) SOT-89 SOT-23 Figure 1. Package Type of AS431I Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 1 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Pin Configuration N Package (SOT-23) P Package (SOT-89) Z Package (TO-92 (Bulk Package)) Z Package (TO-92 (Ammo Package)) Figure 2. Pin Configuration of AS431I (Top View) Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 2 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Functional Block Diagram CATHODE + REF - VREF ANODE Figure 3. Functional Block Diagram of AS431I Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 3 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Ordering Information AS431I - Circuit Type 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 Z: TO-92 Package Temperature Range SOT-23 -40 to 125℃ TO-92 SOT-89 Voltage Tolerance Part Number Marking ID Packing Type 0.5% AS431IANTR-G1 GB9 Tape & Reel 1.0% AS431IBNTR-G1 GC9 Tape & Reel 0.5% AS431IAZ-G1 AS431IAZ-G1 Bulk 0.5% AS431IAZTR-G1 AS431IAZ-G1 Ammo 1.0% AS431IBZ-G1 AS431IBZ-G1 Bulk 1.0% AS431IBZTR-G1 AS431IBZ-G1 Ammo 0.5% AS431IARTR-G1 G43J Tape & Reel 1.0% AS431IBRTR-G1 G43K Tape & Reel -40 to 125℃ -40 to 125℃ BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green. Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 4 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Absolute Maximum Ratings (Note 1) 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 Power Dissipation PD TO-92 770 SOT-89 770 SOT-23 370 mW TJ 150 °C Storage Temperature Range TSTG -65 to 150 °C 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 36 V Cathode Current IKA 0.05 100 mA Operating Ambient Temperature Range TA -40 125 °C Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 5 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Electrical Characteristics Operating Conditions: TA=25℃, unless otherwise specified. Parameter Reference Voltage Test Circuit Symbol 4 VREF Conditions Min Typ Max 2.487 2.500 2.512 2.475 2.500 2.525 4.5 8 -40 to 85 C 4.5 10 o -40 to 125 C 4.5 16 ∆VKA= 10V to VREF -1.0 -2.7 ∆VKA= 36V to 10V -0.5 -2.0 IKA=10mA,R1=10kΩ, R2=∞ 0.035 0.5 µA 0.03 0.3 µA 10 50 µA 0.5% VKA=VREF, IKA=10mA V 1.0% Deviation of Reference Voltage Over Full Temperature Range 0 to 70oC 4 ∆VREF VKA=VREF IKA= 10mA Unit o mV Ratio of Change in Reference Voltage to the Change in Cathode Voltage 5 Reference Current 5 IREF 5 ∆IREF IKA=10mA, R1=10kΩ, R2=∞, TA=-40 to 125 oC 4 IKA (Min) VKA=VREF 6 IKA (Off) VKA=36V, VREF=0 0.05 1.0 µA 4 ZKA VKA=VREF, IKA=1 to 100mA, f≤1.0kHz 0.15 0.5 Ω Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-state Cathode Current Dynamic Impedance Thermal Resistance ∆VREF ∆VKA θJC IKA=10mA mV/V TO-92 68 SOT-89 70 SOT-23 113 Aug. 2011 Rev. 1. 6 °C/W BCD Semiconductor Manufacturing Limited 6 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I 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 Figure 6. Test Circuit 6 for IOFF Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 7 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Performance Characteristics 0.055 VKA=VREF IKA=10mA R1=10K, R2=infinite IKA=10mA 0.050 Reference Current (µA) Reference Voltage (V) 2.52 2.51 2.50 2.49 0.045 0.040 0.035 0.030 0.025 2.48 -60 -40 -20 0 20 40 60 80 100 120 140 0.020 -40 0 -20 0 20 Temperature ( C) 60 80 100 120 o Figure 7. Reference Voltage vs. Ambient Temperature Figure 8. Reference Current vs. Ambient Temperature 50 120 VKA=VREF 100 VKA=VREF 40 o 80 40 Temperature ( C) o TA=25 C 30 TA=25 C Cathode Current (µA) Cathode Current (mA) 60 40 20 0 -20 -40 -60 20 10 0 -10 -20 -30 -80 -40 -100 -120 -50 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Cathode Voltage (V) Cathode Voltage (V) Figure 9. Cathode Current vs. Cathode Voltage Figure 10. Cathode Current vs. Cathode Voltage Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 8 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Performance Characteristics (Continued) 0.4 VKA=36V VKA=3.5V to 36V VREF=0 0.12 0.2 0.10 ∆VREF/∆VKA (mV/V) Off-state Cathode Current (µA) 0.14 0.08 0.06 0.04 0.0 -0.2 -0.4 0.02 0.00 -60 -40 -20 0 20 40 60 80 100 120 -0.6 -60 140 0 -40 -20 0 20 40 60 80 100 120 140 0 Temperature ( C) 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 60 IKA=10mA o 50 I KA Small Signal Voltage Gain (dB) 15K TA=25 C 242 10µF 8.2K 40 30 20 10 0 -10 -20 GND -30 1k 10k 100k 300k Frequence (Hz) Figure 13. Small Signal Voltage Gain vs. Frequency Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 9 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Performance Characteristics (Continued) 100 90 Cathode Current (mA) 150 R1 (10K) 80 IKA 70 60 Stable Stable 50 40 30 VKA=VREF 20 VKA=5V VKA=10V 10 0 R2 VKA>10V, No Oscillation 0.001 0.01 0.1 1 10 Load Capacitor (µF) Figure 14. Stability Boundary Conditions vs. Load Capacitance Output 220 Pulse Generator f=100KHz 50 GND Figure 15. Pulse Response of Input and Output Voltage Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 10 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Application VOUT=(1+R1/R2)*VREF Figure 16. Shunt Regulator VOUT=(1+R2/R3)*VREF Figure 17. High Current Shunt Regulator IOUT=VREF/R2+IKA Figure 18. Current Source or Current Limit Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 11 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Application (Continued) Figure 19. Precision 5V 1A Regulator Figure 20. PWM Converter with Reference Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 12 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions TO-92(Bulk Packing) Unit: mm(inch) 1.000(0. 039) 1.400(0. 055) 3.430(0. 135) MIN 0.320(0. 013) 0.510(0. 020) 0. 000(0.000) 0. 380(0.015) Φ1. 600(0. 063) MAX 4.400(0. 173) 4.800(0. 189) 0.360(0. 014) 0.760(0. 030) 1.270(0. 050) TYP 2.420(0.095) 2.660(0.105) Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 13 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions (Continued) TO-92(Ammo Packing) Unit: mm(inch) 4.400(0. 173) 4.800 (0.189 ) 1. 100(0. 043) 1. 400(0. 055) 1.270(0. 050) Typ 3. 430(0.135) MIN 2.500(0. 098) 4.000 (0.157 ) 0. 320(0. 013) 0. 510(0. 020) 0.000(0.000) 0.380(0.015) 13.000(0. 512) 15.000 (0.591 ) Φ1. 600(0. 063) MAX 0.380(0.015) 0.550(0.022 ) 2.540(0.100) Typ Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 14 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions (Continued) SOT-23 3.0 ° 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) 7.0° 0.080(0.003) 0.150(0.006) 0.550(0.022)REF 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 4×R0.100(0.004) 0.500(0.020) 0.700(0.028) 2.0° 1.050(0.041)REF Unit: mm(inch) 0.390(0.015) 0.450(0.018) 1.900(0.075)REF Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 15 Data Sheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I 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 1.620(0.064)REF 2.210(0.087)REF R0.150(0.006) 10 Aug. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 16 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. BCD BCD Semiconductor Semiconductor Manufacturing Manufacturing Limited Limited does does not not assume assume any any responsibility responsibility for for use use of of any any its its products products for for any any particular purpose, particular purpose, nor nor does does BCD BCD Semiconductor Semiconductor Manufacturing Manufacturing Limited Limited assume assume any any liability liability arising arising out out of of the the application application or or use use of any of any its its products products or or circuits. circuits. BCD BCD Semiconductor Semiconductor Manufacturing Manufacturing Limited Limited does does not not convey convey any any license license under under its its patent patent rights rights or or other rights other rights nor nor the the rights rights of of others. others. MAIN SITE SITE MAIN - Headquarters BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited - Wafer Fab No. 1600, Zi Xing Road, Shanghai ZiZhu Science-basedLimited Industrial Park, 200241, China Shanghai SIM-BCD Semiconductor Manufacturing Tel: Fax: +86-21-24162277 800,+86-21-24162266, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 REGIONAL SALES OFFICE Shenzhen OfficeSALES OFFICE REGIONAL - Wafer FabSemiconductor Manufacturing Limited BCD Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. - IC Design Group 800 Yi Shan Road, Shanghai 200233, China Corporation Advanced Analog Circuits (Shanghai) Tel: +86-21-6485 1491,YiFax: 0008200233, China 8F, Zone B, 900, Shan+86-21-5450 Road, Shanghai Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 Taiwan Office Shanghai Semiconductor Manufacturing Co., Ltd., Shenzhen Office BCD Taiwan Semiconductor Shenzhen SIM-BCD Office Office (Taiwan) Company Limited Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan Shenzhen, 4F, 298-1, Guang Road,(Taiwan) Nei-Hu District, Taipei, Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.District, Shenzhen Office BCDRui Semiconductor Company Limited China Taiwan Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, Tel: +86-755-8826 Tel: +886-2-2656 2808 Room E, 5F, Noble 7951 Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Taiwan Fax: +86-755-88267951 7865 Fax: +886-2-2656 28062808 Tel: +86-755-8826 Tel: +886-2-2656 Fax: +86-755-8826 7865 Fax: +886-2-2656 2806 USA Office BCD Office Semiconductor Corp. USA 30920Semiconductor Huntwood Ave.Corporation Hayward, BCD CA 94544, USA Ave. Hayward, 30920 Huntwood Tel :94544, +1-510-324-2988 CA U.S.A Fax:: +1-510-324-2988 +1-510-324-2788 Tel Fax: +1-510-324-2788