SEMICONDUCTOR AS432 1.24V Precision Adjustable Shunt Reference Features Description • • • • • Temperature-compensated: 50 ppm/°C 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. • Low output noise 0.25% to 2.0% bandgap offered Internal amplifier with 150 mA capability 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. Multiple temperature ranges Low frequency dynamic output impedance: < 150 mΩ Pin Configuration — Top view TO-92 (LP) 8L SOIC (8D) CATHODE 1 8 REFERENCE ANODE 2 7 ANODE ANODE 3 6 ANODE N/C 4 5 N/C CATHODE ANODE REFERENCE 5L SOT-23 (5VS) N/C SOT-89 (S) ANODE CATHODE CATHODE N/C CATHODE 3L SOT-23 (3VS) ANODE ANODE REFERENCE REFERENCE REFERENCE Ordering Information AS432 A C 8D N Circuit Type: 1.24V Precision Adjustable Shunt Regulator Packaging Option: A = Ammo Pack B = Bulk T = Tube M = Tape and Reel (7" Reel Dia, SOT-23 Only) N = Tape and Reel (13" Reel Dia) Bandgap Tolerance: A = ±0.25% C = ±0.5% D = ±1.0% E = ±2.0% Package Style: 8D = 8 Pin, Plastic SOIC 5VS = 5 Pin, SOT-23 3VS = 3 Pin, SOT-23 = SOT-89 S LP = TO-92 Temperature Range: A = 0°C to 70°C B = 0°C to 105°C C = –40°C to 85°C F = –55°C to 125°C www.ptcc.com.tw 25 AS432 1.24V Precision Adjustable Shunt Reference Functional Block Diagram CATHODE (K) REFERENCE (R) + – + – 1.24 V ANODE (A) Absolute Maximum Ratings Parameter Symbol Rating Units VKA 18 V Cathode-Anode Reverse Breakdown 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 TO-92 775 mW 8L SOIC 750 mW SOT-89 1000 mW SOT-23/3L/5L 200 mW Junction Temperature TJ 150 °C Storage Temperature TSTG –65 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 Symbol Rating Cathode Voltage VKA VREF to 18 V Cathode Current IK 10 mA www.ptcc.com.tw Unit θJA θJC Typical Derating TO-92 160°C/W 80°C/W 6.3 mW/°C SOIC 175°C/W 45°C/W 5.7 mW/°C SOT-89 110°C/W 8°C/W 9.1 mW/°C SOT-23/5L 575°C/W 150°C/W 1.7 mW/°C Package 26 AS432 1.24V Precision Adjustable Shunt Reference 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 www.ptcc.com.tw Figure 1b. Test Circuit 2 28 Figure 1c. Test Circuit 3 1.24V Precision Adjustable Shunt Reference AS432 Typical Performance Curves 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 0 VKA = VREF Temperature Range –55 to 125°C 75 50 25 0 –25 –50 –55°C –100 –75 25°C –200 –0.5 –100 0 0.5 1.0 1.5 –2 –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) 0 30 60 TA – Ambient Temperature (°C) Figure 4 www.ptcc.com.tw –30 Figure 5 29 90 120 AS432 1.24V Precision Adjustable Shunt Reference 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 Figure 8 www.ptcc.com.tw –30 0 30 60 TA – Free Air Temperature (°C) f – Frequency (Hz) Figure 9 30 90 120 1.24V Precision Adjustable Shunt Reference AS432 Typical Performance Curves Dynamic Output Impedance 100 ZKA – Dynamic Impedance (Ω) TA = 25°C IK = 1 to 100 mA 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 www.ptcc.com.tw 31 AS432 1.24V Precision Adjustable Shunt Reference 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 www.ptcc.com.tw 32