Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Adjustable Precision Shunt Voltage Regulator General Description • LM431AN-R and LM431BN-R are three terminal Adjustable Precision Shunt Regulators, With guaranteed thermal stability over a full temperature range • The output Voltage of these ICs can be set to any value between VREF (Typical 2.50V) and the cathode voltage (maximum 36V) with two external resistors. These Devices feature the sharp turn-on characteristics, low temperature coefficient and low output impedance, making them ideal substitute for Zener Diode in many applications such as switching power supplies, charger and other adjustable regulators. SOT-23 • LM431 precision reference Voltage tolerance is offered in 2 grades:1% for LM431AN-R and 0.5% for LM431BN-R • Both LM431AN-R and LM431BN-R are available in SOT-23 package . Features • Programmable Precise Output Voltage from 2.50V to 36V • • • • • • High Stability under Capacitive Load Wide Operation Temperature Range:-40°C to 125°C Low Temperature Deviation:4.5mV (Typical) Low Equivalent Full-range Temperature Coefficient :20ppm/°C (Typical) Low Dynamic Output Rresitance:0.15Ω (Typical) Sink Current Capacity from 1mA to 100mA • Low Output Noise • RoHS Compliance and Halogen Free Applications • • • • • Switching Power Supply Charger Voltage Adapter Graphic Card Precision Voltage Reference 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/LX Page 1 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Ordering Information Pin Configuration Functional Block Diagram 1: CATHODE 2: REF 3: ANODE SOT-23 Marking information: Outline Temperatue Range SOT-23 -40 to 125°C VREF Tolerance PN Marking Code Packing Type 1% LM431AN-R-08-RG70 GB2 Tape & Reel 0.5% LM431BN-R-08-RG70 GB1 Tape & Reel Rev. A/LX www.taitroncomponents.com Page 2 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Absolute Maximum Ratings Symbol Description Ratings Unit VKA IKA IREF PD TJ TSTG ESD(Human body model) Cathode Voltage Cathode Current Reference Input Current Power Dissipation Junction Temperature Storage Temperature Range ESD 40 -100 to 150 10 370 150 -65 to 150 2000 V mA mA mW °C °C V Recommend Operating Ratings(Note1) Symbol Description VKA IKA TA Cathode Voltage Continuous Cathode Current Operating Ambient Temperatrue Ratings Min Max 36 VREF 1.0 100 -40 125 Unit V mA °C Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Recommend Opertaing ratings indicate conditions for which the devices is functional,but do not guarantee specific specifation limits. For guarantee specifation and test conditions,see the Electrical Charctristics, the guarantee specifation apply only for the test conditions listed.Some performance characteristics may degrade when the device is not operated under the listed test conditions. Electrical Characteristics (TA=25°C, unless otherwise specified) Symbol VREF Description Reference Voltage 0.5% 1% Min. Typ. Max. Unit Test Circuit Test Conditions 2.487 2.475 - 2.500 2.500 4.5 4.5 4.5 2.512 2.525 8 10 16 V V Fig.1 VKA=VREF,IKA=10mA mV Fig.1 mV/ V Fig.2 uA Fig.2 ∆ VREF Deviation of Reference Voltage Over Full Temperature Range ∆ VREF ∆ VKA Ratio of change in Reference Voltage to the change in Cathode Voltage - -1.0 -2.7 - -0.5 -2.0 Reference Current - 0.7 4 IREF 0°C to 70°C VKA=VREF -40°C to 85°C IKA=10mA -40°C to125°C ∆ VKA=10V to VREF IKA=10mA ∆ VKA=36V to 10V IKA=10mA,R1=10KΩ,R2=∞ Rev. A/LX www.taitroncomponents.com Page 3 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R ∆ IREF IKA(Min) IKA(Off) |ZKA| Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-state Cathode Current Dynamic Impedance - 0.4 1.2 uA Fig.2 IKA=10mA, R1=10KΩ,R2=∞ TA =-40°C to125°C - 0.4 1.0 mA Fig.1 VKA=VREF - 0.05 1.0 uA Fig.3 - 0.15 0.5 Ω Fig.1 VKA=36V, VREF=0V VKA=VREF, IKA=1mA to 100mA,f≤1.0KHz . Parameter Test Circuit Fig.1 Test Circuit for VKA=VREF Fig.2 Test Circuit for VKA>VREF Fig.3 Test Circuit for IKA(Off) Rev. A/LX www.taitroncomponents.com Page 4 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Typical Characteristics Curves Fig.4 VREF-TA Fig.5 IREF-TA R1=10K Ω Reference Current IREF (uA) Reference Voltage VREF (V) VKA=VREF IKA=10mA Operation Ambient Temperature TA (° C) R2= ∞ IKA=10mA Operation Ambient Temperature TA (° C) VKA=VREF TA=25 ° C Cathode Voltage VKA (V) Fig.7 IKA-VKA Cathode Current IKA (uA) Cathode Current IKA (mA) Fig.6 IKA-VKA VKA=VREF TA=25 ° C Cathode Voltage VKA (V) Rev. A/LX www.taitroncomponents.com Page 5 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Fig.9 Ratio of change in Reference Voltage to the change in Cathode Voltage (mV/V) Off-State Cathode Current IKA (off) (uA) ( A) Fig.813 IKA(Off)-TA VKA=36V VREF=0V Operation Ambient Temperature TA (° C) ∆ VREF -TA ∆ VKA VKA=3.5V to 36V Operation Ambient Temperature TA (° C) Fig.10 VG-f Voltage Gain VG (dB) TA=25 ° C IKA=10mA Small Signal Frequency f (Hz) Rev. A/LX www.taitroncomponents.com Page 6 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Reference Impedance (Ω) Fig.11 |ZKA|-f TA=25 ° C IKA=10mA Frequency f (Hz) Cathode Current IKA (mA) Fig.12 IKA-CLOAD Stable Stable Load Capacitance CLOAD (uF) Rev. A/LX www.taitroncomponents.com Page 7 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Output and Input Voltage VOUT/VIN (V) Fig.13 Pulse Respond of Input and Output Voltage Input Output Time (uS) Rev. A/LX www.taitroncomponents.com Page 8 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Typical Standard Application Circuit Fig.14 Shunt Regulator Fig.16 Current Source or Current Limit Fig.15 High Current Shunt Regulator Fig.17 Precision 5V 1 A Regulator Fig.18 PWM Converter With Reference Rev. A/LX www.taitroncomponents.com Page 9 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R Dimensions in mm (inch) SOT-23 Rev. A/LX www.taitroncomponents.com Page 10 of 11 Adjustable Precision Shunt Voltage Regulator LM431AN-R LM431BN-R 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 METROBANK PLAZA, 1160 WEST YAN’ AN ROAD, SUITE 1503, SHANGHAI, 200052, CHINA Tel: +86-21-5424-9942 Fax: +86-21-5424-9931 Rev. A/LX www.taitroncomponents.com Page 11 of 11