LL431

UNISONIC TECHNOLOGIES CO., LTD LL431 PROGRAMMABLE PRECISION REFERENCE DESCRIPTION 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. LINEAR INTEGRATED CIRCUIT 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. ORDERING INFORMATION Ordering Number Package Lead Free Halogen Free LL431K-AE3-R LL431G-AE3-R SOT-23 LL431NSK-AE3-R LL431NSG-AE3-R SOT-23 Note: Pin Code: K: Cathode A: Anode R: Reference LL431G-AE3-R (1)Packing Type (2)Package Type (3)Halogen Free Pin Assignment 1 2 3 K R A R K A Packing Tape Reel Tape Reel (1) R: Tape Reel, T: Tube (2) AE3: SOT-23 (3) G: Halogen Free, K: Lead Free MARKING PACKAGE MARKING SOT-23 SOT-23 (LL431NS) www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd 1 of 5 QW-R121-020,B LL431 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT 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,B LL431 PARAMETER LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) SYMBOL RATINGS UNIT Cathode Voltage VKA 37 V Cathode Current Range(Continuous) IKA -100 ~ +150 mA Reference Input Current IREF -0.05 ~ +10 mA Power Dissipation PD 300 mW Operating Junction Temperature TJ +150 °C Operating Ambient 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. RECOMMENDED OPERATING CONDITIONS PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IKA MIN VREF 1 TYP MAX 36 100 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 ΔVKA=10V~VREF -1.0 -2.7 ΔVREF/ΔVKA IKA=10mA mV/V -0.5 -2.0 ΔVKA=36V~10V 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,B LL431 ■ TYPICAL CHARACTERISTICS Cathode Current vs. Cathode Voltage 150 125 Ta=25°C VKA=VREF LINEAR INTEGRATED CIRCUIT Cathode Current vs. Cathode Voltage 800 Cathode Current (mA) 100 75 50 25 0 -25 -50 -75 -100 -2 600 Cathode Current (μA) Ta=25°C VKA=VREF 400 IKA(MIN) 200 0 -1 0 1 2 3 -200 -2 -1 0 1 2 3 Cathode Voltage (V) Cathode Voltage (V) 0 Change in Reference Input Voltage vs. Cathode Voltage IKA=100mA Ta=25°C Pulse Response 7 Ta=25°C 6 Change In Reference Input Voltage (mV) -5 -10 -15 -20 -25 -30 -35 -40 -50 Input and Output Voltage (V) 40 5 4 3 2 1 0 -1 -1 0 1 2 3 4 5 6 7 0 5 10 15 20 25 30 35 Cathode Voltage (V) Time (μs) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R121-020,B LL431 TEST CIRCUIT LINEAR INTEGRATED CIRCUIT For VKA=VREF For VKA≧ VREF For IKA(OFF) APPLICATION CIRCUIT VIN VIN IN VIN VoUT VoUT UTC7805 R1 COMMON OUT R1 VoUT R1 VREF R2 UTC LL431 UTC LL431 VREF R2 VREF R2 UTC LL431 VOUT=(1+R1/R2)*VREF VOUT=(1+R1/R2)*VREF VOUT=(1+R1/R2)*VREF Shutdown Regulator Output Control of a Three -Terminal Fixed Regulator Higher-current Shunt Regulator Constant-current Sink Current Limiting or Current Source 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,B