JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD SOT-23 Encapsulate Adjustable Reference Source CJ431 Adjustable Accurate Reference Source DEVICE DESCRIPSION The CJ431 is a three-terminal adjustable shunt regulator offering excellent temperature stability . This device has a typical dynamic output impedance of 0.2. The device can be used as a replacement for zener diodes in many applications. SOT-23 1. REFERENCE 2. CATHODE FEATURES 3. ANODE z The output voltage can be adjusted to 36V z Low dynamic output impedance, its typical value is 0.2 z Trapping current capability is 1 to 100mA z Low output noise voltage z Fast on -state response z The effective temperature compensation in the working range of full temperature z The typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/ APPLICATION z Shunt Regulator z High-Current Shunt Regulator z Precision Current Limiter ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) Symbol Value Unit Cathode Voltage Parameter VKA 37 V Cathode Current Range (Continuous) IKA -100~+150 mA Reference lnput Current Range Iref 0.05~+10 mA Power Dissipation PD Thermal Resistance from Junction to Ambient RJA 417 /W Operating Junction Temperature Tj 150 Operating Ambient Temperature Range Topr 0~+70 -65~+150 Storage temperature Range Tstg 300 mW G,Apr,2013 C,Jan,2011 ELECTRICAL CHARACTERISTICS (Ta=25 unless otherwise specified) Parameter Reference input voltage (Fig.1) Deviation of reference input voltage over temperature (note) (Fig.1) Symbol Test Vref conditions VKA=VREF, IKA=10mA VKA =VREF, IKA =10mA Vref /T Deviation Of reference input current over full temperature range (Fig.2) Minimum cathode current for regulation (Fig.1) Off-state cathode Current (Fig.3) Dynamic impedance V -1.0 -2.7 mV/V -0.5 -2.0 mV/V 1.5 4 A 0.4 1.2 A VKA=VREF 0.45 1.0 mA VKA=36V,VREF=0 0.05 1.0 A 0.15 0.5 IKA=10mA =10V~VREF VKA =36V~ 10V lref 2.550 Unit mV voltage (Fig.2) Reference input current (Fig.2) 2.5 Max 17 VKA Vref /VKA 2.450 Typ 4.5 TminTaTmax Ratio of change in reference input voltage to the change in cathode Min IKA= 10mA,R1=10k R2= lKA=10mA, R1=10k lref /T R2= Ta=full Temperature IKA(min) IKA(OFF) ZKA VKA=VREF, lKA=1 to 100mA f1.0kHz note: TMIN=0 ,TMAX=+70 CLASSIFICATION RI Vref Rank Range 0.5% 2.487-2.513 1% 2.475-2.525 G,Apr,2013 CJ431 Typical Characteristics Cathode Current versus Cathode Voltage IK, CATHODE CURRENT (mA) 150 100 50 0 -50 VKA=Vref -100 Ta=25 -2 -1 0 1 2 VKA, CATHODE VOLTAGE 3 (V) KA Cathode Current versus Cathode Voltage 800 IK, CATHODE CURRENT (uA) 700 KA 600 IKA(min) 500 400 300 200 100 0 -200 -1.0 ref VKA=Vref -100 Ta=25 -0.5 0.0 0.5 1.0 1.5 VKA, CATHODE VOLTAGE 2.0 2.5 3.0 (V) Test Circuit for VKA=Vref G,Apr,2013 Change in Reference Input Voltage versus Cathode Voltage 0 Vref, REFERENCE INPUT VOLTAGE (mV) IK=10mA Ta=25 -4 -8 -12 -16 -20 0 5 10 15 20 25 VKA, CATHODE VOLTAGE (nA) Test Circuit for VKA=Vref(1+R1/R2)+R1*Iref 500 400 300 200 100 IK=10mA R1=10K -20 0 20 40 60 Ta, AMBIENT TEMPERATURE 80 100 Test Circuit for Iref () Off-State Cathode Current versus Ambient Temperature 50 (nA) 40 600 0 -40 Ioff, OFF-STATE CATHODE CURRENT 35 Reference Input Current versus Ambient Temperature 700 Iref, REFERENCE INPUT CURRENT 30 (V) 45 40 35 30 25 20 15 10 VKA=36V 5 0 -40 Vref=0V -20 0 20 40 Ta, AMBIENT TEMPERATURE 60 80 100 Test Circuit for Ioff () G,Apr,2013