KA431S / KA431SA / KA431SL Programmable Shunt Regulator Features Description • • • • The KA431S / KA431SA / KA431SL are three-terminal adjustable regulator series with a guaranteed thermal stability over the operating temperature range. 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 2% KA431SMF2TF KA431SAMFTF KA431SAMF2TF -25 to +85°C KA431SLMFTF KA431SLMF2TF © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 1% 0.5% Top Mark Package Packing Method SOT-23F 3L Tape and Reel 43A 43D 43B 43E 43C 43F www.fairchildsemi.com KA431S / KA431SA / KA431SL — Programmable Shunt Regulator March 2015 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 2% tolerance 1% tolerance 43C MF- MF2- 0.5% tolerance 43C 43F 0.5% tolerance Figure 2. Top Mark (per package) © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 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 Thermal Resistance Junction-Air MF Suffix Package 350 °C/W PD Power Dissipation(3,4) MF Suffix Package 350 mW TJ Junction Temperature 150 °C (1,2) RθJA 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 © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 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: 5. TMIN = -25°C, TMAX = +85°C © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 www.fairchildsemi.com 4 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Electrical Characteristics(5) 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) Typical Applications 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 6. Shunt Regulator Figure 7. Output Control for Three-Terminal Fixed Regulator KA431S KA431S Figure 9. Current Limit or Current Source © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 Figure 8. High Current Shunt Regulator Figure 10. Constant-Current Sink www.fairchildsemi.com 5 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Test Circuits 800 150 VKA = VREF VKA = VREF o TA = 25 C o I , CATHODE CURRENT (uA) (μA) IKA - Cathode Current 100 50 600 IKA(MIN) 400 200 KA 0 K I , Cathode Current Current (mA) (mA) IK - Cathode TA = 25 C -50 -100 -2 -1 0 1 2 0 -200 3 -1 0 VKA, Cathode Voltage (V) 3 Figure 12. Cathode Current vs. Cathode Voltage 0.20 3.5 0.18 Iref - Reference Input Current (μA) 0.16 Iref, Reference Input Current (uA) Ioff - Off-State Cathode Current (μA) Ioff , Off-State Cathode Current (uA) 2 VKA - Cathode Voltage (V) Figure 11. Cathode Current vs. Cathode Voltage 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 -50 1 VKA, CATHODE VOLTAGE (V) VKA - Cathode Voltage (V) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 -25 0 25 50 75 100 125 -25 150 0 25 50 75 100 125 oo TA -TAmbient C) , AmbientTemperature Temperature (( C) A o TAT-, Ambient Temperature Ambient Temperature ( C) (oC) A Figure 13. OFF-State Cathode Current vs. Ambient Temperature Figure 14. Reference Input Current vs. Ambient Temperature 6 60 o TA=25 C 5 40 30 20 INPUT 4 Voltage Swing (V) 50 Voltage Swing (V) Open Loop (dB) Open LoopVoltage Voltage Gain Gain (dB) o TA = 25 C IKA = 10mA 3 OUTPUT 2 10 1 0 0 -10 1k 10k 100k 1M 0 10M 8 12 16 20 Figure 16. Pulse Response Figure 15. Frequency vs. Small Signal Voltage Amplification © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 4 Time (us) Time (μs) Frequency (Hz) Frequency (Hz) www.fairchildsemi.com 6 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Typical Performance Characteristics (Continued) 5 140 A VKA = Vref B VKA = 5.0 V @ IK = 10mA 4 o TA = 25 C A 100 Current (mA) Current(mA) IKIK,-CATHODE CathodeCURRENT(mA) Current (mA) 120 80 60 3 2 40 1 20 B 0 100p 1n 10n 100n 1? 0 0.0 10? CCLL,-LOAD LoadCAPACITANCE 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) Anode-Ref. Voltage(V) Figure 18. Anode-Reference Diode Curve Figure 17. Stability Boundary Conditions 5 VREF , Reference Input Voltage (V) 2.51 Current (mA) 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 2.49 2.48 2.47 2.46 -50 2.0 -25 0 25 50 75 100 125 o TA, Ambient Temperature ( C) Ref.-Cathode (V) Ref.-Cathode Voltage Voltage(V) Figure 19. Reference-Cathode Diode Curve © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 2.50 Figure 20. Reference Input Voltage vs. Ambient Temperature www.fairchildsemi.com 7 KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Typical Performance Characteristics KA431S / KA431SA / KA431SL — Programmable Shunt Regulator Physical Dimensions Figure 21. 3-LEAD, SOT23, FLAT LEAD, LOW PROFILE © 2002 Fairchild Semiconductor Corporation KA431S / KA431SA / KA431SL Rev. 6.7 www.fairchildsemi.com 8 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. F-PFS¥ FRFET® SM Global Power Resource GreenBridge¥ Green FPS¥ Green FPS¥ e-Series¥ Gmax¥ GTO¥ IntelliMAX¥ ISOPLANAR¥ Making Small Speakers Sound Louder and Better™ MegaBuck¥ MICROCOUPLER¥ MicroFET¥ MicroPak¥ MicroPak2¥ MillerDrive¥ MotionMax¥ MotionGrid® MTi® MTx® MVN® mWSaver® OptoHiT¥ OPTOLOGIC® AccuPower¥ AttitudeEngine™ Awinda® AX-CAP®* BitSiC¥ Build it Now¥ CorePLUS¥ CorePOWER¥ CROSSVOLT¥ CTL¥ Current Transfer Logic¥ DEUXPEED® Dual Cool™ EcoSPARK® EfficientMax¥ ESBC¥ ® ® Fairchild Fairchild Semiconductor® FACT Quiet Series¥ FACT® FAST® FastvCore¥ FETBench¥ FPS¥ OPTOPLANAR® ® PowerTrench® PowerXS™ Programmable Active Droop¥ QFET® QS¥ Quiet Series¥ RapidConfigure¥ ¥ Saving our world, 1mW/W/kW at a time™ SignalWise¥ SmartMax¥ SMART START¥ Solutions for Your Success¥ SPM® STEALTH¥ SuperFET® SuperSOT¥-3 SuperSOT¥-6 SuperSOT¥-8 SupreMOS® SyncFET¥ Sync-Lock™ ®* ® TinyBoost TinyBuck® TinyCalc¥ TinyLogic® TINYOPTO¥ TinyPower¥ TinyPWM¥ TinyWire¥ TranSiC¥ TriFault Detect¥ TRUECURRENT®* μSerDes¥ UHC® Ultra FRFET¥ UniFET¥ VCX¥ VisualMax¥ VoltagePlus¥ XS™ Xsens™ ❺™ * Trademarks of System General Corporation, used under license by Fairchild Semiconductor. DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. TO OBTAIN THE LATEST, MOST UP-TO-DATE DATASHEET AND PRODUCT INFORMATION, VISIT OUR WEBSITE AT HTTP://WWW.FAIRCHILDSEMI.COM. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in cause the failure of the life support device or system, or to affect its accordance with instructions for use provided in the labeling, can be safety or effectiveness. reasonably expected to result in a significant injury of the user. ANTI-COUNTERFEITING POLICY Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fairchild's Anti-Counterfeiting Policy is also stated on our external website, www.fairchildsemi.com, under Sales Support. Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing counterfeiting of their parts. Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failed applications, and increased cost of production and manufacturing delays. Fairchild is taking strong measures to protect ourselves and our customers from the proliferation of counterfeit parts. Fairchild strongly encourages customers to purchase Fairchild parts either directly from Fairchild or from Authorized Fairchild Distributors who are listed by country on our web page cited above. Products customers buy either from Fairchild directly or from Authorized Fairchild Distributors are genuine parts, have full traceability, meet Fairchild's quality standards for handling and storage and provide access to Fairchild's full range of up-to-date technical and product information. Fairchild and our Authorized Distributors will stand behind all warranties and will appropriately address any warranty issues that may arise. Fairchild will not provide any warranty coverage or other assistance for parts bought from Unauthorized Sources. Fairchild is committed to combat this global problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Advance Information Formative / In Design Preliminary First Production No Identification Needed Full Production Obsolete Not In Production Definition Datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve the design. Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor. The datasheet is for reference information only. Rev. I73 © Fairchild Semiconductor Corporation www.fairchildsemi.com