Bay Linear Inspire the Linear Power B3431 Adjustable Shunt Regulator Description Features 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. • • • • • 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 • • • • • • Package Information Ordering & Marking Information SOT-23-3 (K3) B3431 SOT-23-3 (K3) LM3431 ANODE ANODE 3 3 1 Switching Power Supplies Adjustable Power Supplies Linear Regulators Battery Powered Equipment Monitors, TV, VCR Instrumentation 1 2 Package SOT-23 Tolerance 0.5% B3431AK3 1% B3431BK3 2% B3431CK3 2 REF CATHODE CATHODE REF Top View 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 Maximum 37 150 10 Units V mA mA PD 750 775 200 mW OJA 575 175 160 -40 to +150 -65 to +150 300 2 °C/W TJ TSTG TLEAD TESD °C °C °C kV Recommended Operating Conditions Min VREF 0.1 Cathode Voltage, Vz Cathode Current, Iz 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) 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) Min 2.490 -2.7 -2.0 Typ 2.50 4 -1.0 -0.4 Max 2.515 17 0.7 4 µA 0.4 1.2 µA 0.3 Units V mV mV/V IZ (OFF) VREF = 0V, VZ =36V(3) 0.1 1 µA rz F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) 0.20 0.50 Ω IZ(MIN) VZ = VREF(1) 0.4 1 mA Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 B3431 1% 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) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,ΔVZ = 10V to VRef IZ = 10mA,ΔVZ = 36V to 10V Min 2.474 -2.7 -2.0 R1 = 10kΩ, R2 = ∞, IZ = 10mA(2) R1 = 10kΩ, R2 = ∞, IZ = 10mA(2) Typ 2.50 4 -1.0 -0.4 Max 2.526 17 0.7 4 µA 0.4 1.2 µA 0.3 Units V mV mV/V IZ (OFF) VREF = 0V, VZ =36V(3) 0.1 1 µA rz F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) 0.20 0.50 Ω IZ(MIN) VZ = VREF(1) 0.4 1 mA B3431 2% 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) 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) Min 2.445 -2.7 -2.0 Typ 2.495 4 -1.0 -0.4 Max 2.545 17 0.7 4 µA 0.4 1.2 µA 0.3 Units V mV mV/V IZ (OFF) VREF = 0V, VZ =36V(3) 0.1 1 µA rz F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) 0.20 0.50 Ω IZ(MIN) VZ = VREF(1) 0.4 1 mA Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 mV % 0 ∆VREF ∆Τ -10 5000 TC in %/°C = 0.5 -20 ∆VREF (mV) TC in mV/°C = -55 -25 0 25 50 75 ∆TA TC in ppm/°C = 100 125 ∆VREF VREF at 25°C ) x 100 ∆TA ∆VREF VREF at 25°C ) 0 ) 0 ppm Calculating Average Temperature Coefficient (TC) ) x 106 ∆TA Temperature (°C) 0.06 mV/°C 0.002 %/°C 24 ppm/°C Test Circuit VIN VKA = VREF IREF IK VIN VKA R1 VIN IK VKA IK (OFF) (VREF) R2 Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Figure 1c. Test Circuit 3 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 TYPICAL PERFORMANCE CURVES High Current Operating Characteristics Low Current Operating Characteristics 900 150 VKA = VREF Temperature Range: - 0 to 105 °C 800 700 100 600 500 400 105 °C 300 25 °C 200 75 IK - Cathode Current (mA) IK - Cathode Current (µ µA) VKA = V REF Temperature Range: - 0 to 105 °C 125 50 25 0 -25 -0°C 100 -50 0 -75 -100 -100 -200 -1.0 0 1.0 2.0 -2 3.0 0 1 2 VKA - Cathode Voltage (V) Figure 2 Figure 3 Off State Leakage 3 Reference Voltage vs. Ambient Temperature 100 2.53 V KA = 18V V REF = 0V V KA = V REF IK = 10 mA 2.52 VREF - Reference Voltage (V) IZ off - Off State Cathode Current (nA) -1 VKA - Cathode Voltage (V) 10 1 0.1 2.51 2.50 V REF = 2.500 V at 25 °C 2.49 2.48 2.47 2.46 0.01 -60 -30 0 30 60 90 120 TA - Ambient Temperature ( °C) Figure 4 Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 2.45 -60 -30 0 30 60 90 120 TA - Ambient Temperature ( °C) Figure 5 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 TYPICAL PERFORMANCE CURVES Reference Input Current 2.5 Reference Voltage Line Regulation 0 R1 = 10 k Ω R2 = ∞ IK = 10 mA VREF - Change in Reference Voltage (mV) IREF - Reference Input Currentµ(A) 3.0 2.0 1.5 1.0 0.5 -10 0 °C -20 25 °C 75 °C -30 105 °C -40 -50 0 -60 -30 0 30 60 90 120 0 3 6 9 12 15 TA - Ambient Temperature ( °C) VKA - Cathode Voltage (V) Figure 6 Figure 7 18 Low Frequency Dynamic Output Impedance Noise Voltage 0.150 70 VKA = VREF IKA = 1 to 100 mA f < 1 kHz 60 ZKA - Dynamic Impedance (Ω ) 0.125 Noise Voltage nV/√Hz 50 40 30 20 0.100 0.075 0.050 0.025 10 V KA = V REF IK = 10 mA TA = 25°C 0.0 0 -60 10 100 1k 10 k -30 0 30 60 90 120 100 k f - Frequency (Hz) Figure 8 Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 TA - Free Air Temperature Figure 9 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 TYPICAL PERFORMANCE CURVES Dynamic Output Impedance 100 ZKA - Dynamic Impedance 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 70 Temperature Range: -0 to 105 °C AV - Small Signal Voltage Gain (dB) 60 IK = 10 mA 50 OUT 40 15 k IK 230 Ω 9 µF 30 8.25 k 20 GND 10 0 1k 10 k 100 k f - Frequency (Hz) 1M 10 M Figure 11 Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 TYPICAL PERFORMANCE CURVES Pulse Response 6 INPUT Input and Output Voltages (V) 5 INPUT MONITOR 220 Ω OUT 4 3 OUTPUT 50 Ω fP = 100 kHz 2 1 GND 0 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 µs) t - Time (µ Figure 12 Stability Boundary Conditions 100 A: B: C: D: 90 V KA = V REF V KA = 5V at I K = 10 mA V KA = 10V at I K = 10 mA V KA = 15V at I K = 10 mA 80 IK - Cathode Current (mA) 70 C 150 Ω 60 IK 50 40 STABILITY REGION CL 30 A 20 TA = 25 °C 10 10 k B D 0 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 CL - Load Capacitance (pF) Figure 13 Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B3431 Packaging Information SOT-23 0.015 - 0.018 (0.381 - 0.457) 0.047 - 0.055 0.083 - 0.098 (1.194 - 1.397) (2.108 - 2.489) 0.035 - 0.040 (0.889 - 1.016) 0.020 - 0.024 (0.508 - 0.610) 0.070 - 0.080 (1.778 - 2.032) 0.110 - 0.120 (2.794 - 3.048) 0.001 - 0.004 (0.025 - 0.102) 0.003 - 0.005 (0.076 - 0.127) 0.030 - 0.041 (0.762 - 1.041) 0.018 - 0.024 (0.457 - 0.610) Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations, computer simulations and/ or initial prototype evaluation. Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges. The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application. LIFE SUPPORT AND NUCLEAR POLICY Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without the specific written consent of Bay Linear President. Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com