UNISONIC TECHNOLOGIES CO., LTD LL431 LINEAR INTEGRATED CIRCUIT PROGRAMMABLE PRECISION REFERENCE 3 1 2 The UTC LL431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5V) and 36 V with two external resistors. It can be used in provides very wide applications including shunt regulator, series regulator, switching regulator, voltage reference and others. 4 5 1 2 3 1 SOT-25 SOT-89 FEATURES *Programmable output Voltage to 36V. *Low dynamic output impedance 0.2Ω. *Sink current capability of 1.0 to 100mA. *Equivalent full-range temperature coefficient of 50ppm/ °C typical for operation over full rated operating temperature range. SOT-23 DESCRIPTION 1 SOP-8 TO-92 ORDERING INFORMATION Ordering Number Pin Assignment Package Lead Free Halogen Free 1 2 3 4 5 6 LL431K-AB3-R LL431G-AB3-R SOT-89 R A K LL431K-AE3-R LL431G-AE3-R SOT-23 K R A LL431NSL-AE3-R LL431NSG-AE3-R SOT-23 R K A LL431K-AF5-R LL431G-AF5-R SOT-25 X X K R A LL431K-S08-R LL431G-S08-R SOP-8 K A A X X A LL431K-T92-B LL431G-T92-B TO-92 R A K LL431K-T92-K LL431G-T92-K TO-92 R A K LL431K-T92-R LL431G-T92-R TO-92 R A K Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd 7 A - 8 R - Packing Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tape Box Bulk Tape Reel 1 of 5 QW-R121-020,E LL431 LINEAR INTEGRATED CIRCUIT MARKING PACKAGE MARKING SOT-23 SOT-23 (LL431NS) 4 5 SOT-25 LL431 1 2 G: Halogen Free K: Lead Free 3 BLOCK DIAGRAM CATHODE REFERENCE CATHODE (K) REFERENCE (R) 2.5V VREF ANODE(A) ANODE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R121-020,E LL431 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) PARAMETER RATINGS UNIT Cathode Voltage 37 V Cathode Current Range(Continuous) -100 ~ +150 mA Reference Input Current -0.05 ~ +10 mA SOT-89 500 mW SOT-23/ SOT-25 300 mW Power Dissipation PD SOP-8 600 mW TO-92 770 mW Junction Temperature TJ +150 °C Operating Temperature TOPR -40 ~ +85 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. SYMBOL VKA IKA IREF RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL VKA IKA Cathode Voltage Cathode Current RATINGS VREF ~ 36 1 ~ 100 UNIT V mA ELECTRICAL CHARACTERISTICS (TC= 25℃, unless otherwise specified.) PARAMETER Reference Input Voltage Deviation of reference Input Voltage Over temperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance SYMBOL TEST CONDITIONS MIN TYP MAX UNIT VREF VKA=VREF,IKA=10mA ±0.5% 2.483 2.495 2.507 V VKA=VREF,IKA=10mA ΔVREF/ΔT 4.5 17 mV 0°C≦TA≦70°C -1.0 -2.7 ΔVKA=10V~VREF ΔVREF/ΔVKA IKA=10mA mV/V ΔVKA=36V~10V -0.5 -2.0 IREF IKA=10mA, R1=10kΩ, R2=∞ 1.5 4 μA IKA=10mA, R1=10kΩ, R2=∞ ΔIREF/ΔT 0.4 1.2 μA TA =full Temperature IKA(MIN) VKA=VREF 0.15 mA IKA(OFF) VKA=36V, VREF=0 0.05 1.0 μA VKA=VREF, IKA=1 to 100mA 0.15 0.5 Ω ZKA f≤1.0kHz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R121-020,E LL431 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT For VKA=VREF For VKA≧ VREF For IKA(OFF) APPLICATION CIRCUIT VoUT VIN VIN VIN IN UTC7805 COMMON R1 R1 VREF VREF R2 R2 UTC LL431 UTC LL431 VOUT=(1+R1/R2)*VREF Shutdown Regulator www.unisonic.com.tw VREF R2 VOUT=(1+R1/R2)*VREF Output Control of a Three -Terminal Fixed Regulator UNISONIC TECHNOLOGIES CO., LTD R1 UTC LL431 VOUT=(1+R1/R2)*VREF Constant-current Sink VoUT VoUT OUT Higher-current Shunt Regulator Current Limiting or Current Source 4 of 5 QW-R121-020,E LL431 LINEAR INTEGRATED CIRCUIT ■ TYPICAL CHARACTERISTICS Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage 150 800 TA=25°C VKA=VREF 100 TA=25°C VKA=VREF 600 Cathode Current (μA) Cathode Current (mA) 125 75 50 25 0 -25 -50 400 IKA(MIN) 200 0 -75 -100 -2 -1 0 1 2 -200 -2 3 -1 0 Cathode Voltage (V) Change in Reference Input Voltage vs. Cathode Voltage 3 Pulse Response TA=25°C -5 6 IKA=100mA TA=25°C -10 -15 -20 -25 -30 -35 -40 -50 2 7 Input and Output Voltage (V) Change In Reference Input Voltage (mV) 0 1 Cathode Voltage (V) 5 4 3 2 1 0 0 5 10 15 20 25 30 35 40 Cathode Voltage (V) -1 -1 0 1 2 3 4 5 6 7 Time (μs) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 5 QW-R121-020,E