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| MITSUMI Precision Adjustable Shunt Regulator MM1431 AT/AN Precision Adjustable Shunt Regulator Monolithic IC MM1431 AT/AN Outline The MM1431AT/AN is 3-termial adjustable shunt regulator, which provides a highly accurate 0.8% bandgap reference voltage. The output voltage can be adjusted to any value between reference voltage VREF and 35 volts with two external resistors. Moreover, there are a lot of ranges of the application as a zener diode besides the replacement is possible because it has steep turn-on characteristics. Features 1. Reference voltage tolerance 2. Output voltage can be adjusted 3. Low Dynamic Output Impedance VREF=2.495V0.8% VREFVo35V ZKA <0.2 typ. Package TO-92 SOT-25 Pin Assignment 1 1 2 3 1 2 3 Reference Anode Cathode 1 2 3 5 4 2 3 4 5 SOT-25 (TOP VIEW) note:The second terminal is SUB, so connect the terminal to GND. NC SUB Cathode Reference Anode TO-92 MITSUMI Precision Adjustable Shunt Regulator MM1431 AT/AN Equivalent Circuit Diagram Absolute Maximum Ratings (Ambient Temperature, Ta=25C) Item Operating Temperature Storage Temperature Cathode to Anode voltage Cathode current Reference input current Allowable loss Symbol TOPR TSTG VKA IK IREF Pd Ratings -30~+85 -40~+125 35 -100~100 -0.05~10 500 (TO-92) 150 (SOT-25) Unit C C V mA mA mW Recommended Operating Conditions Cathode to Anode voltage Cathode current (Ambient Temperature, Ta=25C) VREF~35 0.6~50 V mA VKA IK MITSUMI Precision Adjustable Shunt Regulator MM1431 AT/AN Electrical Characteristics Item Reference voltage Reference voltage deviation over temperature range Lord regulation Reference input current Reference input current deviation over temperature range Minimum Cathode Current Off-state Cathode Current Dynamic Impedance (Ambient Temperature, Ta=25C) Measurement conditions VKA=VREF, IK=10mA VKA=VREF, IK=10mA Ta=-30~+85C VKA=VREF~10V IK=10mA VKA=10V~35V IK=10mA IK=10mA R1=10K, R2= IK=10mA R1=10K, R2= Ta=-30~+85C VKA=VREF VKA=35V, VREF=0V VKA=VREF, f < 1kHz IK=1~50mA = Min. Typ. Max. Unit 2.475 2.495 2.515 10 -1.4 -1 1 0.5 0.3 0.1 0.2 0.6 1.0 0.5 V mV -2.7 mV/V -2 4 mV/V A A mA A Symbol VREF VREF/ Ta VREF / VKA IREF IREF/ Ta IKmin. IOFF ZKA Measuring Circuit (1) VKA=VREF (3) IOFF > (2) VKA = VREF Vo=VKA=VREF (4) Open Loop Voltage Gain MITSUMI Precision Adjustable Shunt Regulator MM1431 AT/AN Characteristics High Voltage Operating Characteristics 150 125 100 75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 3 Reference Input Current Reference Input Current IRef (A) 3 2.5 2 1.5 1 0.5 0 -50 Cathode Current IK (mA) -25 0 25 50 75 100 Cathode Voltage VKA (V) Ambient Temperature Ta (C) Low Current Operating Characteristics 1.2 Reference Voltage 0 Cathode Current IK (mA) Voltage Changed Portion VRef (mV) 0 1 2 3 1.0 0.8 0.6 0.4 0.2 0 -5 -10 -15 -20 -25 -30 0 5 10 15 20 25 30 35 40 Cathode Voltage VKA (V) Cathode Voltage VKA (V) Reference Voltage 2.60 2.58 2.56 2.54 2.52 2.50 2.48 2.46 2.44 2.42 2.40 -50 Off State Leakage 0.30 Reference Voltage VRef (V) Off-state Cathode Current IOFF (mA) -25 0.25 0.20 0.15 0.10 0.05 0 -50 0 25 50 75 100 -25 0 25 50 75 100 Ambient Temperature Ta (C) Ambient Temperature Ta (C) MITSUMI Precision Adjustable Shunt Regulator MM1431 AT/AN Dynamic Output Impedance 100 Open loop Voltage Gain VKA=5V 60 10 Open Loop Voltage Gain AV (dB) 1k 10k 100k 1M Dynamic Impedance (ZKA) () 40 1 20 0.1 0 0.01 100 -20 1k 10k 100k 1M 10M Frequency f (Hz) Frequency f (Hz) Pulse Response Input And Output Voltage VIN VOUT (V) 6 Input Voltage 5 4 3 2 1 0 0 1 2 3 4 5 6 Output Voltage Stability Boundary Conditions 100 Cathode Current IK (mA) a a b b 80 60 40 20 0 00.1 c d c 0.01 0.1 1 10 Time t (S) Load Capacitance CL (F) a: VKA=VREF b: VKA=5V C: VKA=10V d: VKA=15V Cathode voltage temperature Ta=25C IKA=10mA CL=: Ceramic capacitor Notes concerning stability operation region The MM1431AT/AN requires external capasitors for regulator stability. These capacitors must be correctly selected for good performance. |
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