Shunt Regulator LM431L LM431LA LM431LB Shunt Regulator General Description TO-92 • The LM431 Series ICs are low voltage three-terminal programmable shunt regulators with guaranteed thermal stability over a full operation range. These monolithic ICs voltage reference operate as a low temperature coefficient Zener which is programmable from Vref to 18V with two external resistors. These devices exhibit a wide operating current range SOT-23-5 of 80µA to 50/100mA with a typical dynamic impedance of 0.05 to 0.22Ω. The characteristics of these references make them excellent replacements for Zener diodes in many applications such as digital voltmeters, power supplies and op amp circuitry • The LM431L precision reference is offered in three voltage tolerance for VREF=1.240V: 1.5%, 1.0% and 0.5%. • These ICs are available in 4 packages: TO-92, SOT-23, SOT-23-5 and SOT-89. . SOT-23 SOT-89 . Features Applications • Programmable Precise Output Voltage from 1.24V to 16/18V • High Stability under Capacitive Load • Low Temperature Deviation • • • • Low Dynamic Output Impedance: 0.05 to 0.22Ω Typical Operating Current from 80µA to 50/100mA. Low Output Noise Voltage RoHS Compliance • • • • • TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com Tel: Fax: (800)-TAITRON (800)-824-8766 (800)-TAITFAX (800)-824-8329 (661)-257-6060 (661)-257-6415 Graphic Card PC Motherboard Voltage Adapter Switching Power Supply Charger Rev. A/DX 2007-06-04 Page 1 of 13 Shunt Regulator LM431L Ordering Information Pin Configuration Outline: Z TO-92 Outline: N5 SOT-23-5 Outline: N SOT-23 Outline: K SOT-89 Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 2 of 13 Shunt Regulator LM431L Block Diagram Symbols Absolute Maximum Ratings (Ta=25° C) (Full operating ambient temperature range applies unless otherwise noted.) Symbol Description LM431L VKA Cathode Voltage 16 18 V IKA Cathode Current Range (Continuous) 50 -100 ~ +100 mA 3 10 mA TJ Reference Input Current Range (Continuous) Operating Junction Temperature TOPR Operating Temperature Range TSTG Storage Temperature Range IREF PD RthJA Power Dissipation Package Thermal Impedance LM431LA LM431LB 150 -40 ~ 85 Unit °C -40 ~ 125 -65 ~ 150 °C °C Z:TO-92 700 770 N:SOT-23 350 370 N5:SOT-23-5 550 370 K: SOT-89 - 770 Z:TO-92 180 150 N:SOT-23 360 330 N5:SOT-23-5 230 250 K: SOT-89 - 50 mW ° C/W Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 3 of 13 Shunt Regulator LM431L Electrical Characteristics (TA=25ºC, unless otherwise specified) Symbol Description LM431L LM431LA LM431LB Unit Test Circuit Conditions V Fig.1 VKA=VREF,IKA=10mA mV Fig.1 (Note1) VKA=VREF,IKA=10mA -1.5 mV/V Fig.2 IKA= 10mA 0.15 0.4 µA Fig.2 IKA=10mA, R1=10KΩ, R2=∞ - 0.1 0.4 µA Fig.2 IKA=10mA, R1=10KΩ, R2=∞ 80 - 55 80 µA Fig.1 VKA=VREF 40 100 - 40 100 - 10 50 - 10 50 - 0.05 0.15 - 0.05 0.15 Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. 1.222 1.240 1.258 1.228 1.240 1.252 1.234 1.240 1.246 - - - - 2 1- - 2 10 - 7.0 20 - 3 10 - 3 10 - - - - 4 15 - 4 15 - -0.6 -1.5 - -0.5 -1.5 - -0.5 - 0.15 0.3 - 0.15 0.4 - Reference Input Current Deviation Over Temperature Range - 0.05 0.08 - 0.1 0.4 IMIN Min. Cathode Current For Regulation - 55 80 - 55 - 2.6 1000 - IOFF Off-State Cathode Current - - - - 0.22 0.4 VREF ∆VREF ∆VREF/∆VKA IREF ∆IREF ZKA Reference Input Voltage Reference Input Voltage Deviation 0-70° C -40-85 °C -40-125 °C Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage Reference Ta=25° Input C Current Dynamic Impedance nA Fig.1- Test Circuit for VKA=VREF ∆VKA= VKA(max) ~VREF VKA= VKA(max), VREF=0V Fig.3 VKA=6V, VREF=0V Ω Fig.1 (Note2) VKA=VREF, IKA=1.0mA~ IKA(max), f≤1.0KHz Fig.2- Test Circuit for VKA>VREF Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 4 of 13 Shunt Regulator LM431L Fig.3- Test Circuit for IOFF Note1: Note2: Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 5 of 13 Shunt Regulator LM431L Typical Characteristics Curves Junction Temperature TJ (° C) Fig.5- IREF - TJ Reference Input Current IREF (nA) Reference Input Voltage VREF (V) Fig.4- VREF - TJ Junction Temperature TJ (° C) Fig.7- IK – VKA (2) Cathode Current IK (µA) Cathode Current IK (mA) Fig.6- IK – VKA (1) Cathode Voltage VKA (V) Cathode Voltage VKA (V) Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 6 of 13 Shunt Regulator LM431L Fig.9- Pulse Response Voltage Swing (V) Open Loop Voltage Gain GVO (dB) Fig.8- GVO - f Time t (µs) Frequency f (Hz) Fig.11- ZKA - f ∆VREF/∆VKA (mV/V) Dynamic Impedance │ZKA│ (Ω) Fig.10- ∆VREF - TJ Junction Temperature TJ (° C) Frequency f (Hz) Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 7 of 13 Shunt Regulator LM431L Typical Application Fig.12-Shunt Regulator Fig.13- High Current Shunt Regulator Fig.14- Current Source of Current Limit Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 8 of 13 Shunt Regulator LM431L Typical Application (Continued) Fig.15- Precision 5V 1A Regulator Fig.16- PWM Converter with Reference Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 9 of 13 Shunt Regulator LM431L Device Marking Code Circuit LM431L Tolerance SOT-23 (N) SOT-23-5 (N5) SOT-89 (K) Blank 1.5% 24A 24A N/A A 1.0% EA7 E6A E41B B 0.5% EA6 E5A E41A Dimensions in inches (mm) TO-92 Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 10 of 13 Shunt Regulator LM431L SOT-23 SOT-23-5 Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 11 of 13 Shunt Regulator LM431L SOT-89 Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 12 of 13 Shunt Regulator LM431L How to contact us: US HEADQUARTERS 28040 WEST HARRISON PARKAWAY, VALENCIA, CA 91355-4162 Tel: (800) TAITRON (800) 824-8766 (661) 257-6060 Fax: (800) TAITFAX (800) 824-8329 (661) 257-6415 Email: [email protected] Http://www.taitroncomponents.com TAITRON COMPONENTS MEXICO, S.A .DE C.V. BOULEVARD CENTRAL 5000 INTERIOR 5 PARQUE INDUSTRIAL ATITALAQUIA, HIDALGO C.P. 42970 MEXICO Tel: +52-55-5560-1519 Fax: +52-55-5560-2190 TAITRON COMPONETS INCORPORATED E REPRESENTAÇÕES DO BRASIL LTDA RUA DOMINGOS DE MORAIS, 2777, 2.ANDAR, SALA 24 SAÚDE - SÃO PAULO-SP 04035-001 BRAZIL Tel: +55-11-5574-7949 Fax: +55-11-5572-0052 TAITRON COMPONETS INCORPORATED, SHANGHAI REPRESENTATIVE OFFICE CROSS REGION PLAZA, 899 LINGLING ROAD, SUITE 18C, SHANGHAI, 200030, CHINA Tel: +86-21-5424-9942 Fax: +86-21-5424-9931 Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 13 of 13