KA431S / KA431SA / KA431SL Programmable Shunt Regulator Features Description • • • • The KA431S / KA431SA / KA431SL are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage can be set to any value between VREF (approximately 2.5 V) and 36 V with two external resistors. These devices have a typical dynamic output impedance of 0.2 Ω. Active output circuitry provides a sharp turn on characteristic, making these devices excellent replacement for Zener diodes in many applications. Programmable Output Voltage to 36 V Low Dynamic Output Impedance 0.2 Ω (Typical) Sink Current Capability: 1.0 to 100 mA Equivalent Full-Range Temperature Coefficient of 50 ppm/°C (Typical) • Temperature Compensated for Operation Over Full Rated Operating Temperature Range • Low Output Noise Voltage • Fast Turn-on Response SOT-23F 3 1 2 MF- 1.Cathode 2. Ref 3. Anode MF2- 1. Ref 2. Cathode 3. Anode Ordering Information Part Number Operating Output Voltage Temperature Tolerance Range KA431SMFTF KA431SAMFTF -25 to +85°C KA431SLMFTF KA431SLMF2TF © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 Package Packing Method SOT-23F 3L Tape and Reel 43A 2% KA431SMF2TF KA431SAMF2TF Top Mark 43D 43B 1% 43E 43C 0.5% 43F www.fairchildsemi.com 1 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator June 2013 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Block Diagram CATHODE REFERENCE + - 2.5 Vref ANODE CATHODE (K) REFERENCE (R) ANODE(A) Figure 1. Block Diagram Marking Information 43A 43B 2% tolerance 1% tolerance 43A 43D 43E 43B 2% tolerance 1% tolerance 43C MF- MF2- 0.5% tolerance 43C 43F 0.5% tolerance Figure 2. Top Mark (per package) © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 www.fairchildsemi.com 2 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted. Symbol Parameter Value Unit VKA Cathode Voltage 37 V IKA Cathode Current Range (Continuous) -100 ~ +150 mA IREF Reference Input Current Range -0.05 ~ +10 mA 350 °C/W RθJA Thermal Resistance Junction-Air MF Suffix Package (1,2) PD Power Dissipation (3,4) MF Suffix Package 350 mW TJ Junction Temperature 150 °C TOPR Operating Temperature Range -25 ~ +85 °C TSTG Storage Temperature Range -65 ~ +150 °C Notes: 1. Thermal resistance test board Size: 1.6mm x 76.2mm x 114.3mm (1S0P) JEDEC Standard: JESD51-3, JESD51-7. 2. Assume no ambient airflow. 3. TJMAX = 150°C; Ratings apply to ambient temperature at 25°C. 4. Power dissipation calculation: PD = (TJ - TA) / RθJA. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Min. Max. Unit VKA Cathode Voltage VREF 36 V IKA Cathode Current 1 100 mA © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 www.fairchildsemi.com 3 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Absolute Maximum Ratings Values are at TA = 25°C unless otherwise noted. Symbol Parameter VREF Reference Input Voltage VKA = VREF, IKA = 10 mA Deviation of Reference Input Voltage OverTemperature VKA = VREF, IKA = 10 mA, TMIN ≤ TA ≤ TMAX ΔVREF/ΔT Conditions KA431S KA431SA KA431SL Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 4.5 17.0 4.5 17.0 4.5 17.0 ΔVKA = 10 V - VREF -1.0 -2.7 -1.0 -2.7 -1.0 -2.7 Unit V mV Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage IKA = 10 mA ΔVKA = 36 V - 10 V -0.5 -2.0 -0.5 -2.0 -0.5 -2.0 Reference Input Current IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 1.5 4.0 1.5 4.0 1.5 4.0 μA Deviation of Reference Input Current Over Full Temperature Range IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ TA = Full Range 0.4 1.2 0.4 1.2 0.4 1.2 μA IKA(MIN) Minimum Cathode Current for Regulation VKA = VREF 0.45 1.00 0.45 1.00 0.45 1.00 mA IKA(OFF) Off - Stage Cathode Current VKA = 36 V, VREF = 0 0.05 1.00 0.05 1.00 0.05 1.00 μA ZKA Dynamic Impedance VKA = VREF, IKA = 1 to 100 mA, f ≥ 1.0 kHz 0.15 0.50 0.15 0.50 0.15 0.50 Ω ΔVREF/ΔVKA IREF ΔIREF/ΔT mV/V Note: 1. TMIN = -40°C, TMAX = +85°C © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 www.fairchildsemi.com 4 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Electrical Characteristics LM431S KA431S LM431S KA431S Figure 4. Test Circuit for VKA ≥ VREF Figure 3. Test Circuit for VKA= VREF KA431S Figure 5. Test Circuit for IKA(OFF) © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 www.fairchildsemi.com 5 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Test Circuits 800 150 VKA = VREF VKA = VREF o TA = 25 C o TA = 25 C 600 IKA, CATHODE CURRENT (uA) IK, Cathode Current (mA) 100 50 0 IKA(MIN) 400 200 0 -50 -100 -2 -1 0 1 2 -200 3 -1 0 1 VKA, Cathode Voltage (V) 2 3 VKA, CATHODE VOLTAGE (V) Figure 7. Cathode Current vs. Cathode Voltage Figure 6. Cathode Current vs. Cathode Voltage 0.100 3.5 Iref, Reference Input Current (uA) Ioff, Off-State Cathode Current (uA) 3.0 0.075 0.050 0.025 0.000 -50 -25 0 25 50 75 100 2.5 2.0 1.5 1.0 0.5 0.0 -50 125 -25 0 o 25 50 75 100 125 o TA, Ambient Temperature ( C) TA, Ambient Temperature ( C) Figure 9. Reference Input Voltage vs. Ambient Temperature Figure 8. Reference Input Voltage vs. Ambient Temperature 6 60 o TA = 25 C IKA = 10mA 50 o TA=25 C 5 INPUT 4 Voltage Swing (V) Open Loop Voltage Gain (dB) 40 30 20 3 OUTPUT 2 10 1 0 0 -10 1k 10k 100k 1M 0 10M Figure 10. Frequency vs. Small Signal Voltage Amplification © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 4 8 12 16 20 Time (us) Frequency (Hz) Figure 11. Pulse Response www.fairchildsemi.com 6 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Typical Performance Characteristics 5 140 A VKA = Vref B VKA = 5.0 V @ IK = 10mA 120 4 o A 100 Current(mA) IK, CATHODE CURRENT(mA) TA = 25 C 80 60 3 2 40 1 20 B 0 100p 1n 10n 100n 1? 0 0.0 10? CL, LOAD CAPACITANCE 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Anode-Ref. Voltage(V) Figure13. Anode-Reference Diode Curve Figure12. Stability Boundary Conditions 5 Current(mA) 4 3 2 1 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Ref.-Cathode Voltage(V) Figure14. Reference-Cathode Diode Curve © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 www.fairchildsemi.com 7 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Typical Performance Characteristics (Continued) R1 V O = V ref 1 + ------- R2 R1 V O = 1 + ------- V ref R2 KA431S R1 V O = 1 + ------- V ref R2 KA431S KA431S Figure 15. Shunt Regulator Figure 16. Output Control for Three- Figure 17. High Current Shunt ReguTerminal Fixed Regulator lator KA431S KA431S Figure 18. Current Limit or Current Source © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 Figure 19. Constant-Current Sink www.fairchildsemi.com 8 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Typical Application KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Physical Dimensions SOT-23F Figure 20. 3-LEAD, SOT23, FLAT LEAD, LOW PROFILE (ACTIVE) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2011 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 1.1.0 www.fairchildsemi.com 9 TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not intended to be an exhaustive list of all such trademarks. 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