SEMICONDUCTOR AS432 1.24V Precision Adjustable Shunt Reference/Amplifier Features Description ¥ ¥ ¥ ¥ ¥ ¥ The AS432 is a three terminal adjustable shunt regulator utilizing an accurate 1.24V bandgap reference. The AS432 is functionally similar to an AS431 except for its lower reference voltage, making it usable in a wide variety of low voltage applications. Temperature-compensated: 50 ppm/¡C 0.25% to 2.0% bandgap offered Internal amplifier with 150 mA capability Multiple temperature ranges Low frequency dynamic output impedance: < 150 m½ Low output noise Pin Configuration Ñ Because of its robust bipolar technology, the AS432 handles a wide range of current, and holds off more than 18V so its use is not limited to low power, low voltage systems. Significant care has been taken to provide adequate AC bandwidth to allow the AS432 as an amplifier in control systems and power electronics. Top view TO-92 (LP) SOIC (D) CATHODE 1 8 REFERENCE ANODE 2 7 ANODE ANODE 3 6 ANODE N/C 4 5 N/C CATHODE ANODE REFERENCE SOT-23/5L (DBV) N/C SOT-89 (S) ANODE CATHODE CATHODE N/C CATHODE SOT-23/3L (VS) ANODE ANODE REFERENCE REFERENCE REFERENCE Ordering Information AS432 A 2 D 7 Packaging Option: A = Ammo Pack B = Bulk T = Tube 7 = Tape and Reel (7" Reel Dia) 13 = Tape and Reel (13" Reel Dia) Circuit Type: 1.24V Precision Adjustable Shunt Regulator/Amplifier Temperature Range: A = 0°C to 70°C B = 0°C to 105°C C = –40°C to +85°C Package Style: = SOIC D DBV = SOT-23/5L LP = TO-92 = SOT-89 S VS = SOT-23/3L Bandgap Tolerance: = ±2% 2 = ±1% 1 R5 = ±0.5% R25 = ±0.25% ASTEC Semiconductor Powered by ICminer.com Electronic-Library Service CopyRight 2003 1 AS432 1.24V Precision Adjustable Shunt Reference/Amplifier Functional Block Diagram CATHODE (K) REFERENCE (R) + Ð + Ð 1.24 V ANODE (A) Absolute Maximum Ratings Parameter Symbol Rating Units Cathode-Anode Reverse Breakdown VKA 18 V Anode-Cathode Forward Current IAK 1 A Operating Cathode Current IKA 100 mA Reference Input Current IREF 1 mA Continuous Power at 25¡C PD 775 mW 8L SOIC 750 mW SOT-89 1000 mW SOT-23/3L/5L 200 mW TO-92 Junction Temperature TJ 150 ¡C Storage Temperature TSTG Ð65 to 150 ¡C TL 300 ¡C Lead Temperature (Soldering 10 sec.) 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 Typical Thermal Resistances Cathode Voltage VKA VREF to 18 V TO-92 160¡C/W 80¡C/W 6.3 mW/¡C Cathode Current IK 10 mA SOIC 175¡C/W 45¡C/W 5.7 mW/¡C Powered by ICminer.com Electronic-Library Service CopyRight 2003 Package θJC Rating ASTEC Semiconductor Unit θJA Symbol Typical Derating SOT-89 110¡C/W 8¡C/W 9.1 mW/¡C SOT-23/3L/5L 575¡C/W 150¡C/W 1.7 mW/¡C 2 1.24V Precision Adjustable Shunt Reference/Amplifier AS432 Electrical Characteristics Electrical characteristics are guaranteed over the full junction temperature range (0Ð105¡C). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. Unless otherwise stated, test conditions are: VKA = VREF and IK = 10 mA. Parameter Symbol Test Condition Output Voltage VREF IK = 10 mA TJ = 25¡C VK = VREF Line Regulation ÆVREF Load Regulation ÆVREF Temperature Deviation ÆVREF 0 < TJ < 105¡C Reference Input Current IREF Reference Input Current Temperature Coefficient ÆIREF Minimum Cathode Current for Regulation IK(min) Off State Leakage IK(min) Parameter Symbol 28 IK = 1 to 100 mA 3.9 0 < TJ < 105¡C VREF = 0 V, VKA = 15 V Test Condition Line Regulation ÆVREF Load Regulation ÆVREF Temperature Deviation ÆVREF 0 < TJ < 105¡C ÆIREF Minimum Cathode Current for Regulation IK(min) Off State Leakage IK(min) 1.234 VKA = 1.25 to 15 V IK = 10 mA TJ = 25¡C VK = VREF Reference Input Current Temperature Coefficient 1.237 1.243 VREF IREF AS432 (0.5%) Min. Typ. Max. 1.240 Output Voltage Reference Input Current AS432 (0.25%) Min. Typ. Max. 1.240 1.246 V 50 28 50 mV 6 3.9 6 mV 5 10 5 10 mV 2.3 6 2.3 6 µA 0.14 0.6 0.14 0.6 µA 0.2 1 0.2 1 mA 0.04 500 0.04 500 nA AS432 (1.0%) Min. Typ. Max. AS432 (2.0%) Min. Typ. Max. 1.228 1.215 1.240 1.252 VKA = 1.25 to 15 V 28 IK = 1 to 100 mA 3.9 0 < TJ < 105¡C VREF = 0 V, VKA = 15 V Unit Unit 1.240 1.256 V 50 28 50 mV 6 3.9 6 mV 5 12 5 12 mV 2.3 6 2.3 6 µA 0.14 0.6 0.14 0.6 µA 0.2 1 0.2 1 mA 0.04 500 0.04 500 nA *Temperature deviation is defined as the maximum deviation of the reference over the given temperature range and does not imply an incremental deviation at any given temperature. ASTEC Semiconductor Powered by ICminer.com Electronic-Library Service CopyRight 2003 3 AS432 1.24V Precision Adjustable Shunt Reference/Amplifier Typical Performance Curves mV % ppm *Calculating Average Temperature Coefficient (TC) 0 0 0 ∆VREF (mV) • TC in mV/°C = ∆T ∆TA ∆VREF ∆VREF 2000 0.2 –5 • TC in %/°C = VREF at 25°C ∆TA ∆VREF –10 0 15 30 45 60 75 Temperature (°C) 90 105 • TC in ppm/°C = X 100 VREF at 25°C X 106 ∆TA 0.021 mV/°C 0.008%/°C 8.0 ppm/°C Test Circuits VIN IREF VKA = VREF IK VIN VKA IK R1 VIN VKA IK (OFF) IREF (VREF) R2 Figure 1a. Test Circuit 1 ASTEC Semiconductor Powered by ICminer.com Electronic-Library Service CopyRight 2003 Figure 1b. Test Circuit 2 4 Figure 1c. Test Circuit 3 1.24V Precision Adjustable Shunt Reference/Amplifier AS432 Typical Performance High Current Operating Characteristics 175 800 150 700 125 600 100 IK – Cathode Current (mA) IK – Cathode Current (µA) Low Current Operating Characteristics 900 500 400 300 200 125°C 100 VKA = VREF Temperature Range –55 to 125°C 75 50 25 0 –25 –50 0 –55°C –100 –75 25°C –100 –200 –0.5 0 0.5 1.0 –2 1.5 –1 VKA – Cathode Voltage (V) 0 2 VKA – Cathode Voltage (V) Figure 2 Figure 3 Off State Leakage Reference Voltage vs Ambient Temperature 100 1.27 VKA = 15 V VREF = 0 V 1.26 10 VREF – Reference Voltage (V) IZ off – Off State Cathode Current (nA) 1 1 0.1 VKA = VREF IK = 10 mA 1.25 1.24 VREF = 1.240 V at 25°C 1.23 1.22 1.21 1.20 0.01 –60 –30 0 30 60 90 1.19 –60 120 TA – Ambient Temperature (°C) Powered by ICminer.com Electronic-Library Service CopyRight 2003 0 30 60 TA – Ambient Temperature (°C) Figure 4 ASTEC Semiconductor –30 Figure 5 5 90 120 AS432 1.24V Precision Adjustable Shunt Reference/Amplifier Typical Performance Curves Reference Input Current Reference Voltage Line Regulation 0 R1 = 10 kΩ R2 = ∞ IK = 10 mA ∆VREF – Change in Reference Voltage (mV) IREF – Reference Input Current (µA) 2.4 2.3 2.2 2.1 –10 –40°C –20 25°C –30 75°C –40 IK = 10 mA Temperature Range: –55 to 125°C 2.0 –60 –50 –30 0 60 30 90 120 0 3 6 12 15 18 VKA – Cathode Voltage (V) TA – Ambient Temperature (°C) Figure 6 Figure 7 Noise Voltage Low Frequency Dynamic Output Impedance 70 40 VKA = VREF VKA = 1 to 100 mA f ≤ 1kHz VKA = VREF IK = 10 mA TA = 25°C ZKA – Dynamic Impedance (mΩ) 60 50 Noise Voltage nV/√Hz 9 125°C 40 30 20 30 20 10 10 0 10 100 1k 10 k 0 –60 100 k f – Frequency (Hz) Powered by ICminer.com Electronic-Library Service CopyRight 2003 0 30 60 TA – Free Air Temperature (°C) Figure 8 ASTEC Semiconductor –30 Figure 9 6 90 120 1.24V Precision Adjustable Shunt Reference/Amplifier AS432 Typical Performance Curves Dynamic Output Impedance 100 TA = 25°C IK = 1 to 100 mA ZKA – Dynamic Impedance (Ω) 10 1.0 0.1 0.01 1k 10 k 100 k 1M 10 M f – Frequency (Hz) Figure 10 Small Signal Voltage Gain vs. Frequency 80 Temperature Range: –55° to 125°C AV – Small Signal Voltage Gain (dB) 70 OUT IK = 10 mA 60 9 µF 15 k IK 230 Ω 50 40 8.25 k 30 GND 20 10 0 1k 10 k 100 k 1M 10 M f – Frequency (Hz) Figure 11 ASTEC Semiconductor Powered by ICminer.com Electronic-Library Service CopyRight 2003 7 AS432 1.24V Precision Adjustable Shunt Reference/Amplifier Typical Performance Curves Pulse Response 4 Input and Output Votages (V) INPUT MONITOR 3 220 Ω OUT Input 2 50 Ω Output fP = 100 kHz 1 GND 0 –1 0 1 2 3 4 5 6 7 8 t – Time (µs) 9 10 11 12 Figure 12 Stability Boundary Conditions 100 90 IK – Cathode Current (mA) 80 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 Ω 70 IK C 60 50 CL 40 Stability Region 30 A 10 K 20 10 B TA = 25°C D 0 100 101 102 103 104 105 106 107 CL – Load Capacitance (pF) Figure 13 ASTEC Semiconductor Powered by ICminer.com Electronic-Library Service CopyRight 2003 8