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| SEMICONDUCTOR AS1431 Precision Adjustable Shunt Reference Description The AS1431 is a three-terminal adjustable shunt regulator providing a highly accurate 0.4% bandgap reference. The adjustable shunt regulator is ideal for a wide variety of linear applications that can be implemented using external components to obtain adjustable currents and voltages. In the standard shunt configuration, the combination of low temperature coefficient (TC), sharp turn-on characteristics, low output impedance and programmable output voltage make this precision reference a perfect zener diode replacement. The AS1431 is characterized to operate over the full automotive temperature range of 55 to 125C and is now available in the SOT-23 (5L) package. Features Temperature-compensated: 30 ppm/C Trimmed 0.4% bandgap reference Internal amplifier with 150 mA capability Temperature range: Extended to 55 to125C Low frequency dynamic output impedance: < 150 m1/2 Low output noise Robust ESD protection Pin Configuration N Top view TO-92 (LP) CATHODE CATHODE ANODE ANODE REFERENCE ANODE N/C 2 3 4 1 SOIC (D) 8 7 6 5 REFERENCE ANODE ANODE N/C SOT-89 (S) SOT-23/5L (DBV) N/C N/C CATHODE ANODE CATHODE REFERENCE ANODE REFERENCE Ordering Information AS1431 D R4 D 7 Circuit Type: Precision Adjustable Shunt Regulator Temperature Range: D = -55C to +125C Bandgap Tolerance: R4 = 0.4% Packaging Option: A = Ammo Pack B = Bulk T = Tube 7 = Tape and Reel (7" Reel Dia) 13 = Tape and Reel (13" Reel Dia) Package Style: D = SOIC DBV = SOT-23/5L LP = TO-92 S = SOT-89 ASTEC Semiconductor 1 AS1431 Functional Block Diagram Precision Adjustable Shunt Reference CATHODE (K) REFERENCE (R) + 2.5 V ANODE (A) Absolute Maximum Ratings Parameter Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power Dissipation at 25C TO-92 8L SOIC SOT-89 SOT-23/5L Junction Temperature Storage Temperature Lead Temperature Soldering 10 Seconds TJ TSTG TL Symbol VKA IAK IKA IREF PD 775 750 1000 200 150 65 to 150 300 mW mW mW mW C C C Rating 37 1 250 10 Units V A mA mA Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended Conditions Parameter Cathode Voltage Cathode Current Symbol VKA IK Rating VREF to 20 10 Unit V mA Typical Thermal Resistances Package TO-92 SOIC SOT-89 JA 160C/W 175C/W 110C/W JC 80C/W 45C/W 8C/W 150C/W Typical Derating 6.3 mW/C 5.7 mW/C 9.1 mW/C 1.7 mW/C SOT-23/5L 575C/W ASTEC Semiconductor 2 Precision Adjustable Shunt Reference Electrical Characteristics AS1431 Electrical Characteristics are guaranteed over full junction temperature range (55 to 125C). Ambient temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: VKA = VREF and IK = 10 mA unless otherwise stated. Parameter Reference Voltage Symbol VREF TC AEVREF IREF AEIREF IK(min) IK(off) ZKA VREF = 0 V, VKA = 36 V f 1 kHz IK = 1 to 100 mA AEVK = 3 V to 36 V R1 = 10 k 1/2; R2 = Over temp. 2 Test Condition TA = 25C Over temp. AEVREF with Temp* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance Min. 2.490 2.470 0.06 1.1 0.7 0.4 0.4 0.04 0.15 1.9 1.2 1 500 0.2 Typ. 2.500 Max. 2.510 2.530 0.16 Unit V V mV/C mV/V A A mA nA 1/2 Circuit 1 1 1 2 2 2 1 3 1 *Calculating Average Temperature Coefficient (TC) Average Temperature Coefficient ppm 0 0 % 0 * TC in mV/C = VREF -10 5000 0.5 T * TC in %/C = mV VREF (mV) TA VREF VREF at 25C TA VREF -55 -25 0 25 50 75 Temperature (C) 100 125 * TC in ppm/C = VREF at 25C TA X 100 -20 X 106 0.06 mV/C 0.002%/C 24 ppm/C ASTEC Semiconductor 3 AS1431 Test Circuits VIN VKA = VREF VIN Precision Adjustable Shunt Reference VKA VIN VKA IREF IK IK R1 IREF (VREF) R2 IK (OFF) Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Figure 1c. Test Circuit 3 ASTEC Semiconductor 4 Precision Adjustable Shunt Reference Typical Performance Curves AS1431 Low Current Operating Characteristics 900 800 700 IK - Cathode Current (mA) 600 IK - Cathode Current (A) 500 400 300 200 100 0 -100 -200 -1.0 0 1.0 2.0 3.0 125C 25C -55C VKA = VREF Temperature Range: -55 to 125C 150 125 100 75 50 25 0 -25 -50 -75 -100 -2 High Current Operating Characteristics VKA = VREF Temperature Range: -55 to 125C -1 0 1 2 3 VKA - Cathode Voltage (V) VKA - Cathode Voltage (V) Figure 2 Figure 3 Off State Leakage 100 VKA = 36 V VREF = 0 V IZ off - Off State Cathode Current (nA) VREF - Reference Voltage (V) 10 2.53 2.52 2.51 2.50 Reference Voltage vs Ambient Temperature VKA = VREF IK = 10 mA VREF = 2.500 V at 25C 2.49 2.48 2.47 2.46 1 0.1 0.01 -60 -30 0 30 60 90 120 2.45 -60 -30 0 30 60 90 120 TA - Ambient Temperature (C) TA - Ambient Temperature (C) Figure 4 Figure 5 ASTEC Semiconductor 5 AS1431 Typical Performance Curves Precision Adjustable Shunt Reference Reference Input Current 3.0 R1 = 10 k R2 = IK =10 mA 0 Reference Voltage Line Regulation VREF - Change in Reference Voltage (mV) 2.5 IREF - Reference Input Current (A) -10 -55C -20 0C 25C -30 75C 125C -40 IK = 10 mA Temperature Range: -55 to 125C -50 0 3 6 9 12 15 18 21 VKA - Cathode Voltage (V) 24 27 30 2.0 1.5 1.0 0.5 0 -60 -30 0 30 60 90 120 TA - Ambient Temperature (C) Figure 6 Figure 7 Noise Voltage 70 60 VKA = VREF IK = 10 mA TA = 25C ZKA - Dynamic Impedance () 0.150 Low Frequency Dynamic Output Impedance VKA = VREF IKA = 1 to 100 mA f 1 kHz 0.125 50 Noise Voltage nV/HZ 0.100 40 30 0.075 20 0.050 10 0 10 100 1k f - Frequency (Hz) 10 k 100 k 0.025 0.0 -60 -30 0 30 60 90 120 TA - Free Air Temperature Figure 8 Figure 9 ASTEC Semiconductor 6 Precision Adjustable Shunt Reference Typical Performance Curves AS1431 Dynamic Output Impedance 100 TA = 25C IK = 1 to 100 mA ZKA - Dynamic Impedance () 10 1.0 0.1 0.01 1k 10 k 100 k f - Frequency (Hz) 1M 10 M Figure 10 Small Signal Voltage Gain vs. Frequency 70 Temperature Range: -55 to 125C 60 AV - Small Signal Voltage Gain (dB) IK = 10 mA 50 40 30 8.25 k GND 20 10 0 1k 9 F 15 k IK OUT 230 10 k 100 k f - Frequency (Hz) 1M 10 M Figure 11 ASTEC Semiconductor 7 AS1431 Typical Performance Curves Precision Adjustable Shunt Reference Pulse Response 6 Input 5 Input and Output Votages (V) 4 3 2 1 GND 0 -0 0 1 2 3 4 5678 t - Time (ms) 9 10 11 12 Output fp = 100 kHz INPUT MONITOR 220 OUT 50 Figure 12 Stability Boundary Conditions 100 90 80 IK - Cathode Current (mA) 70 60 50 40 30 20 B 10 0 100 TA = 25C 101 D 106 107 Stability Region CL A 10 K C IK A: VKA = VREF B: VKA = 5 V at IK = 10 mA C: VKA = 10 V at IK = 10 mA D: VKA = 15 V at IK = 10 mA 150 102 103 104 105 CL - Load Capacitance (pF) Figure 13 ASTEC Semiconductor 8 |
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