B3431

Bay Bay Linear Ins Inspire the Linear Power Adjustable Shunt Regulator B3431 Description The Bay Linear B3431 is a three terminal adjustable shunt regulator with thermal stability over Temperature range. Using two external resistors allows the output voltage to be adjusted from 2.5V to 36V. With a sharp turn on characteristics the B3431 a superior replacement for zener diode applications. Features • • • • • Wide Operating Range …1mA to100mA Tight Band Gap Tolerance ….….…0.5% Low Temp. Coefficient…...…...30 ppm/oC Wide temp range of –40 to +105oC Available in SOT-23 package . The B3431 shunt regulator has a tolerance of 0.5% which has proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturers assembly line and contribute a significant cost savings. Applications • • • • • • Switching Power Supplies Adjustable Power Supplies Linear Regulators Battery Powered Equipment Monitors, TV, VCR Instrumentation Package Information SOT-23-3 (K3) LM3431 SOT-23-3 SOT-23-3 (K3) B3431 Ordering & Marking Information ANODE 3 1 2 ANODE 3 1 2 Package SOT-23 0.5% B3431AK3 Tolerance 1% B3431BK3 2% B3431CK3 CATHODE REF Top View REF CATHODE Top View CATHODE (K) REFERENCE (R) + 2.5V ANODE (A) Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 Absolute Max Ratings Parameter Cathode Voltage Continuous Cathode Current Reference Input Current Power Dissipation at TA - 25°C S0-8 TO-92 SOT-23-3 Thermal Resistance SOT-23-3 S0-8 TO-92 Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 seconds ESD Rating (Human Body Model) Symbol Vz Iz IREF PD Maximum 37 150 10 750 775 200 575 175 160 -40 to +150 -65 to +150 300 2 Units V mA mA mW OJA TJ TSTG TLEAD TESD °C/W °C °C °C kV Recommended Operating Conditions Cathode Voltage, Vz Cathode Current, Iz Min VREF 0.1 Max 36 150 Symbol V mA Electrical Characteristics Unless specified: T٨ = 25°C. Values in bold apply over full operating ambient temperature. B3431 0.5% Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF To Change in VZ Reference Input Current IREF Temperature Deviation Off-State Cathode Current Dynamic Output Impedance Minimum Operating Current Symbol VREF VDEV Δ VREF ΔVZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,ΔVZ = 10V to VRef IZ = 10mA,ΔVZ = 36V to 10V R1 = 10kΩ, R2 = ∞, IZ = 10mA(2) R1 = 10kΩ, R2 = ∞, IZ = 10mA(2) VREF = 0V, VZ =36V(3) F