AS431I

Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I General Description 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. The output voltage of AS431I can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage (36V). The AS431I is offered in two grade initial voltage tolerance at 25℃, 0.5%, and 1%. This IC is available in 3 packages: TO-92 (bulk or ammo packing), SOT-23 and SOT-89. Features 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 Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference TO-92(Bulk Packing) TO-92(Ammo Packing) SOT-89 SOT-23 Figure 1. Package Type of AS431I Feb. 2009 Rev. 1. 1 1 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 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) Functional Block Diagram CATHODE REF + - VREF ANODE Figure 3. Functional Block Diagram of AS431I Feb. 2009 Rev. 1. 1 2 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Ordering Information AS431I - Circuit Type Voltage Tolerance A: 0.5% B: 1.0% Package N: SOT-23 R: SOT-89 Z: TO-92 Temperature Range -40 to 125℃ 1.0% 0.5% 0.5% TO-92 -40 to 125℃ 1.0% 1.0% 0.5% SOT-89 -40 to 125℃ 1.0% AS431IBRTR-G1 AS431IBZ-G1 AS431IBZTR-G1 AS431IARTR-G1 AS431IBNTR-G1 AS431IAZ-G1 AS431IAZTR-G1 Voltage Tolerance 0.5% SOT-23 G1: Green TR: Tape and Reel or Ammo Blank: Bulk Package Part Number AS431IANTR-G1 Marking ID GB9 GC9 AS431IAZ-G1 AS431IAZ-G1 AS431IBZ-G1 AS431IBZ-G1 G43J G43K Packing Type Tape & Reel Tape & Reel Bulk Ammo Bulk Ammo Tape & Reel Tape & Reel BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green. Feb. 2009 Rev. 1. 1 3 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Absolute Maximum Ratings (Note 1) Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Symbol VKA IKA IREF Value 40 -100 to 150 10 TO-92 770 770 370 150 -65 to 150 2000 Unit V mA mA Power Dissipation PD SOT-89 SOT-23 mW Junction Temperature Storage Temperature Range ESD (Human Body Model) TJ TSTG ESD °C °C V 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 Cathode Voltage Cathode Current Operating Ambient Temperature Range Symbol VKA IKA TA Min VREF 0.05 -40 Max 36 100 125 Unit V mA °C Feb. 2009 Rev. 1. 1 4 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Electrical Characteristics Operating Conditions: TA=25℃, unless otherwise specified. Parameter Test Circuit Symbol Conditions Min Typ Max Unit Reference Voltage 0.5% 4 1.0% 0 to 70oC 4 ∆VREF VKA=VREF IKA= 10mA -40 to 85 C -40 to 125 C ∆VREF ∆VKA ∆VKA= 10V to VREF IKA=10mA ∆VKA= 36V to 10V o o 2.487 VREF VKA=VREF, IKA=10mA 2.475 2.500 2.500 4.5 4.5 4.5 -1.0 -0.5 2.512 V 2.525 8 10 16 -2.7 mV/V -2.0 µA mV Deviation of Reference Voltage Over Full Temperature Range Ratio of Change in Reference Voltage to the Change in Cathode Voltage Reference Current Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-state Cathode Current Dynamic Impedance 5 5 IREF IKA=10mA,R1=10kΩ, R2=∞ IKA=10mA, R1=10kΩ, R2=∞, TA=-40 to 125 oC VKA=VREF VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA, f≤1.0kHz TO-92 3.6 10 5 ∆IREF IKA (Min) IKA (Off) ZKA 2 4 µA 4 6 4 10 0.05 0.15 68 70 113 50 1.0 0.5 µA µA Ω Thermal Resistance θJC SOT-89 SOT-23 °C/W Feb. 2009 Rev. 1. 1 5 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Electrical Characteristics (Continued) R1 VIN IKA VKA VREF Figure 4. Test Circuit 4 for VKA=VREF R3 VIN IKA R1 IREF VKA=VREF(1+R1/R2)+ IREF*R1 R2 VREF VKA Figure 5. Test Circuit 5 for VKA﹥VREF Figure 6. Test Circuit 6 for IOFF Feb. 2009 Rev. 1. 1 6 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Performance Characteristics 2.52 VKA=VREF IKA=10mA 4.8 4.6 4.4 R1=10K, R2=infinite IKA=10mA Reference Voltage (V) 2.51 Reference Current (µA) -40 -20 0 20 40 60 0 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.50 2.49 2.48 -60 80 100 120 140 -60 -40 -20 0 20 40 60 0 80 100 120 140 Temperature ( C) Temperature ( C) Figure 7. Reference Voltage vs. Ambient Temperature Figure 8. Reference Current vs. Ambient Temperature 50 120 100 80 60 VKA=VREF TA=25 C o 40 30 VKA=VREF TA=25 C o Cathode Current (mA) 40 20 0 -20 -40 -60 -80 -100 -120 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Cathode Current (µA) 20 10 0 -10 -20 -30 -40 -50 -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 Feb. 2009 Rev. 1. 1 7 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Performance Characteristics (Continued) 0.4 0.14 VKA=36V VREF=0 ∆VREF/∆VKA (mV/V) 0.2 VKA=3.5V to 36V Off-state Cathode Current (µA) 0.12 0.10 0.08 0.06 0.04 0.02 0.00 -60 0.0 -0.2 -0.4 -40 -20 0 20 40 60 0 80 100 120 140 -0.6 -60 -40 -20 0 20 40 60 0 80 100 120 140 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 TA=25 C o 15K 10µF I KA 242 Small Signal Voltage Gain (dB) 50 40 30 20 10 0 -10 -20 -30 1k 8.2K GND 10k 100k 300k Frequence (Hz) Figure 13. Small Signal Voltage Gain vs. Frequency Feb. 2009 Rev. 1. 1 8 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Performance Characteristics (Continued) Output 220 Pulse Generator f=100KHz 50 GND Figure 14. Pulse Response of Input and Output Voltage Feb. 2009 Rev. 1. 1 9 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Application VOUT=(1+R1/R2)*VREF Figure 15. Shunt Regulator VOUT=(1+R2/R3)*VREF Figure 16. High Current Shunt Regulator IOUT=VREF/R2+IKA Figure 17. Current Source or Current Limit Feb. 2009 Rev. 1. 1 10 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Typical Application (Continued) Figure 18. Precision 5V 1A Regulator Figure 19. PWM Converter with Reference Feb. 2009 Rev. 1. 1 11 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions TO-92(Bulk Packing) Unit: mm(inch) 3.300(0.130) 4.300(0.169) 4.700(0.185) 3.700(0.146) 14.100(0.555) Feb. 2009 Rev. 1. 1 12 BCD Semiconductor Manufacturing Limited 14.500(0.571) Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions (Continued) TO-92(Ammo Packing) Unit: mm(inch) 4.300(0.169) 3.300(0.130) 3.700(0.146) 13.000(0.512) Feb. 2009 Rev. 1. 1 13 14.000(0.551) 4.700(0.185) BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions (Continued) SOT-23 Unit: mm(inch) Feb. 2009 Rev. 1. 1 14 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR AS431I Mechanical Dimensions (Continued) SOT-89 Unit: mm(inch) 1.630(0.064) 1.830(0.072) 1.400(0.055)* 4.400(0.173) 4.600(0.181) 0.000(0.000) 0.076(0.003) 1.400(0.055) 1.600(0.063) R0.200(0.008) 0.900(0.035) 3.950(0.156) 4.250(0.167) 1.200(0.047) 2.300(0.091) 2.600(0.102) 3° 10° 0.360(0.014) 0.520(0.020) 3.000(0.118) 0.360(0.014) 0.480(0.019) 0.440(0.017) 0.560(0.022) 0.360(0.014) 0.440(0.017) 3° 10° R0.150(0.006) Feb. 2009 Rev. 1. 1 15 BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifiBCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. 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