. ADJUSTABLE OUTPUT VOLTAGE :

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1 PROGRAMMABLE VOLTAGE REFERENCE. ADJUSTABLE OUTPUT VOLTAGE : Vref to 36V SINK CURRENT CAPABILITY : 1 to 100mA. TYPICAL OUTPUT IMPEDANCE : 0.22W 1% AND 2% VOLTAGE PRECISION Z TO92 (Plastic Package) DESCRIPTION The TL431 is a programmable shunt voltage reference with guaranteedtemperature stability over the entire temperature range of operation. The output voltagemay be set to any value between V ref (approximately2.5v) and 36V with two external resistors. The TL431 operates with a wide current range from 1 to 100mA with a typical dynamic impedance of 0.22Ω. ORDER CODES D SO8 (Batwing Plastic Micropackage) Package Part number Temperature Range Z D TL431C/AC 0 o C, +70 o C TL431I/AI -40 o C, +85 o C PIN CONNECTIONS TO92 (Top view) Cathode Ano de Reference SO8 (Top view) Cathode 2 - Anode 3 - Anode 4 - N.C. 5 - N.C. 6 - Anode 7 - Anode 8 - Reference December /6

2 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V KA Cathode to Anode Voltage 37 V IK Continuous Cathode Current Range 00 to +150 ma I ref Reference Input Current Range to +10 ma T oper Operating Free-air Temperature Range TL431C/AC TL431I/AI 0 to to +85 Tstg Storage Temperature Range -65 to +150 o C o C OPERATING CONDITIONS Symbol Parameter Value Unit V KA Cathode to Anode Voltage V ref to 36 V IK Cathode Current 1 to 100 ma ELECTRICAL CHARACTERISTICS Tamb =25 o C (unless otherwise specified) Symbol Parameter TL431C TL431AC V ref Reference Input Voltage - (figure 1) VKA =Vref, IK= 10mA Tamb =25 o C T min. T amb T max V KA Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA =Vref, IK =10mA, Tmin. Tamb Tmax Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) I K = 10mA V KA = 10V to V ref VKA = 36V to 10V Iref Reference Input Current - (figure 2) IK = 10mA, R1 = 10kΩ, R2= T amb =25 o C Tmin. Tamb Tmax. Iref Reference Input Current Deviation Over Temperature Range - (figure 2) I K = 10mA, R 1 = 10kΩ, R 2 = T min. T amb T max Imin Minimum Cathode Current for Regulation - (figure 1) ma V KA =V ref Ioff Off-State Cathode Current - (figure 3) na Z KA Dynamic Impedance - (figure 1, note 2) V KA =V ref, I K = 1 to 100mA, f 1kHz Ω Unit V mv mv/v Notes : 1. is defined as the difference between the maximum and minimum values obtained over the full temperature range. =Vref max. -Vref min V ref ma x. Vre fmin. T1 T2 Tempe ra ture 2. The dynamic Impedance is defined as Z KA = VKA I K 2/6

3 ELECTRICAL CHARACTERISTICS Tamb =25 o C (unless otherwise specified) Symbol Parameter V ref Reference Input Voltage - (figure 1) VKA =Vref, IK= 10mA Tamb =25 o C Tmin. Tamb Tmax. V KA TL431I TL431AI Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA =Vref, IK =10mA, Tmin. Tamb Tmax Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) I K = 10mA V KA = 10V to V ref VKA = 36V to 10V Iref Reference Input Current - (figure 2) I K = 10mA, R 1 = 10kΩ, R 2 = T amb =25 o C Tmin. Tamb Tmax. I ref Reference Input Current Deviation Over Temperature Range - (figure 2) I K = 10mA, R 1 = 10kΩ, R 2 = T min. T amb T max I min Minimum Cathode Current for Regulation - (figure 1) ma V KA =V ref I off Off-State Cathode Current - (figure 3) na ZKA Dynamic Impedance - (figure 1, note 2) VKA =Vref, IK = 1 to 100mA, f 1kHz Ω Unit V mv mv/v Notes : 1. is defined as the difference between the maximum and minimum values obtained over the full temperature range. =V ref max. -V ref min V ref ma x. Vre fmin. T1 T2 Tempe ra ture 2. The dynamic Impedance is defined as Z KA = V KA I K 3/6

4 Figure 1 : Test Circuit for VKA = Vref Input V KA I K V re f Figure 2 : Test Circuit for VKA >Vref Input V KA R 1 I ref I K R 2 V ref V KA = V ref(1+ R1 R 2 )+I ref.r1 Figure 3 : Test Circuit for Ioff Input V KA = 36V I off 4/6

5 PACKAGE MECHANICAL DATA 8 PINS - BATWING PLASTIC MICROPACKAGE (SO8) Dimensions Millimeters Inches A a a a b b C c1 45 o (typ.) D E e e F L M S 8 o (max.) 5/6

6 PACKAGE MECHANICAL DATA 3 PINS - PLASTIC PACKAGE TO92 Dimensions Millimeters Inches L B O C K O a Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 6/6