LM431L

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 • 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 Applications • • • • • Graphic Card PC Motherboard Voltage Adapter Switching Power Supply Charger TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com Tel: Fax: (800)-TAITRON (800)-824-8766 (800)-TAITFAX (800)-824-8329 (661)-257-6060 (661)-257-6415 Rev. A/DX 2007-06-04 Page 1 of 13 Shunt Regulator LM431L Ordering Information Pin Configuration Outline: Z TO-92 Outline: N SOT-23 Outline: N5 SOT-23-5 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 VKA IKA IREF TJ TOPR TSTG Description Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range (Continuous) Operating Junction Temperature Operating Temperature Range Storage Temperature Range Z:TO-92 PD Power Dissipation N:SOT-23 N5:SOT-23-5 K: SOT-89 Z:TO-92 RthJA Package Thermal Impedance N:SOT-23 N5:SOT-23-5 K: SOT-89 700 350 550 180 360 230 LM431L 16 50 3 150 -40 ~ 85 -40 ~ 125 -65 ~ 150 770 370 370 770 150 330 250 50 ° C/W mW LM431LA LM431LB Unit V mA mA °C °C °C 18 -100 ~ +100 10 Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 3 of 13 Shunt Regulator LM431L Electrical Characteristics (TA=25ºC, unless otherwise specified) Symbol VREF Description Reference Input Voltage Reference Input Voltage Deviation 0-70° C LM431L Min. 1.222 Typ. 1.240 7.0 Max. 1.258 20 - LM431LA Min. 1.228 Typ. 1.240 2 3 4 Max. 1.252 110 15 LM431LB Min. 1.234 Typ. 1.240 2 3 4 Max. 1.246 10 10 15 Unit V Test Circuit Fig.1 Conditions VKA=VREF,IKA=10mA ∆VREF ∆VREF/∆VKA IREF ∆IREF -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 Reference Input Current Deviation Over Temperature Range Min. Cathode Current For Regulation mV Fig.1 (Note1) VKA=VREF,IKA=10mA - -0.6 -1.5 - -0.5 -1.5 - -0.5 -1.5 mV/V Fig.2 IKA= 10mA ∆VKA= VKA(max) ~VREF - 0.15 0.3 - 0.15 0.4 - 0.15 0.4 µA Fig.2 IKA=10mA, R1=10KΩ, R2=∞ IKA=10mA, R1=10KΩ, R2=∞ - 0.05 0.08 - 0.1 0.4 - 0.1 0.4 µA Fig.2 IMIN - 55 80 - 55 80 - 55 80 µA Fig.1 VKA=VREF VKA= VKA(max), VREF=0V VKA=6V, VREF=0V IOFF Off-State Cathode Current - 2.6 0.22 1000 0.4 - 40 10 0.05 100 50 0.15 - 40 10 0.05 100 nA 50 0.15 Ω Fig.1 (Note2) Fig.3 ZKA Dynamic Impedance VKA=VREF, IKA=1.0mA~ IKA(max), f≤1.0KHz Fig.1- Test Circuit for VKA=VREF 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 Fig.4- VREF - TJ Reference Input Voltage VREF (V) Reference Input Current IREF (nA) Fig.5- IREF - TJ Junction Temperature TJ (° C) Junction Temperature TJ (° C) Fig.6- IK – VKA (1) Cathode Current IK (mA) Fig.7- IK – VKA (2) Cathode Current IK (µA) 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.8- GVO - f Open Loop Voltage Gain GVO (dB) Fig.9- Pulse Response Voltage Swing (V) Time t (µs) Frequency f (Hz) Fig.10- ∆VREF - TJ Dynamic Impedance │ZKA│ (Ω) Fig.11- ZKA - f ∆VREF/∆VKA (mV/V) 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 Blank A B 1.5% 1.0% 0.5% SOT-23 (N) 24A EA7 EA6 SOT-23-5 (N5) 24A E6A E5A SOT-89 (K) N/A E41B 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: taitron@taitroncomponents.com 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