TS3431 1.24V programmable shunt voltage reference Features Adjustable output voltage: 1.24 to 24V Several precision levels @ 25C 2%, 1%, 0.5% and 0.25% Sink current capability: 0.4 to 100mA Industrial temperature range: -40C to +125C Performance compatible with industry standard TL431 L SOT23-3L (Plastic micropackage) Applications Computers Instrumentation Battery chargers Switch mode power supply Battery operated equipment SOT23-3 (top view) Reference 1 TS3431 Description The TS3431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire operating temperature range (-40C to +125C). The output voltage can be set to any value between 1.24V and 24V with an external resistor bridge. Cathode 3 Anode 2 Available in SOT23-3 surface mount package, it can be used in application designs where space saving is critical. June 2007 Rev 3 1/10 www.st.com 10 Block diagram 1 TS3431 Block diagram Figure 1. Block diagram Cathode Reference + - VREF Anode 2 Absolute maximum ratings Table 1. Absolute maximum ratings (AMR) Symbol VKA IK IREF Parameter Value Unit 25 V -100 to +150 mA -0.05 to10 mA 360 mW -65 to +150 C 2 kV Machine model (MM) 200 V Lead temperature (soldering, 10 seconds) 250 C Value Unit Cathode to anode voltage Reverse breakdown current Reference current Pd Power dissipation (1)SOT23-3L Tstg Storage temperature Human body model (HBM) ESD Tlead 1. Pd is calculated with Tamb = 25C, Tj = 150C, Rthjc = 110C/W, Rthja = 340C/W. Table 2. Symbol Parameter IK Cathode operating current 0.5 to 100 mA VK Cathode operating voltage 1.24 to 24 V -40 to +125 C Toper 2/10 Operating conditions Operating free air temperature range TS3431 Electrical characteristics 3 Electrical characteristics Table 3. Tamb = 25C (unless otherwise specified)(1) Symbol VK VK TC Parameter Reference input voltage IK = 10mA Variation of reference input voltage over temperature Temperature coefficient Test conditions TS3431 (2%) 1.215 TS3431A (1%) 1.228 Vref ---------------Vka IREF IREF IOFF Typ. Max. 1.252 V TS3431B (0.5%) 1.234 1.246 TS3431C (0.25%) 1.237 1.243 0C < T < +70C 10 -40C < T < +105C 18 -40C < T < +125C 21 -40C < T < +125C 100 0.35 mV ppm/C 0.4 Minimum operating current mA -40C < T < +125C IK=10mA Ratio of change in reference input voltage to change in cathode to anode VK= 24 to 1.24V voltage -40C < T < +125C 0.5 1.2 1.5 mV/V 2 Reference input current IK=10mA, R1=10K, R2=+ T= 25C Reference input current deviation IK=10mA, R1=10K, R2=+ 0C < T < +70C 0.5 1 -40C < T < +125C 0.9 1.5 T= 25C 35 500 Off-state cathode current VK=24V Unit 1.265 1.24 T = 25C IKmin Min. 0.9 1.5 A -40C < T < +125C 2 A -40C < T < +105C 1000 -40C < T < +125C 2000 RKA Reverse static impedance IK = 1 to 100mA 0.2 EN Wideband noise IK = 10mA 1kHz < f < 100kHz 100 0.4 nA W nV/ Hz 1. Limits are 100% production tested at 25C. Behavior at the temperature range limits is guaranteed through correlation and by design. 3/10 Electrical characteristics Figure 2. TS3431 Reference voltage vs. temperature Figure 3. Test circuit for VK = Vref Voltage Reference (V) 1.250 Input Output 1.245 Ik IK = 10mA VK = VREF 1.240 Vka 1.235 Vref 1.230 -40 0 40 80 120 Temperature (C) Figure 4. Cathode voltage vs cathode current Figure 5. IKMIN (mA) T=-40C Minimum operating current Cathode voltage VK (V) 1.5 1.0 0.5 0.0 0.0 T=+25C 0.1 T=+125C 0.2 0.3 0.5 0.4 0.3 VK = VREF 0.2 0.1 0.0 -40 0.4 Minimum operating current vs temperature 0 40 Cathode current IK (mA) Figure 6. Reference input current vs temperature Figure 7. 120 Dynamic impedance vs frequency 0.5 Dynamic impedance ZKA ( ) Reference current IREF (A) 1.00 0.75 0.50 0.25 VK = VREF T=+25C 0.4 0.3 0.2 0.1 0.00 -40 0 40 Temperature (C) 4/10 80 Temperature (C) 80 120 0.0 10 100 1000 Frequency (Hz) 10000 TS3431 Electrical characteristics Figure 8. Off-state current vs temperature Figure 9. Test circuit for off-state current measurement OFF State Current IOFF (nA) 300 Vka=24V 200 Ioff 100 0 -40 0 40 80 120 Temperature (C) Figure 10. Ratio of change in reference input Figure 11. Test circuit for VK > VREF voltage to change in VKA voltage vs temperature 2.0 Input Vka VREF / VK (mV/V) Ik 1.5 R1 Iref 1.0 VK = 1.24 to 24V IK = 10 mA 0.5 0.0 -40 0 40 80 R2 Vref 120 Vka = Vref . (1+R1/R2) + Iref . R1 Temperature (C) Figure 12. Pulse response at IK=1mA Figure 13. Test circuit for pulse response at IK = 1mA 5.0 T=+25C Input Voltage ... 2.7K Output voltage 0 Output 4V 2.5 Intput Voltage (V) IK=1mA ... 0.0 0 2 4 6 8 Time (s) 5/10 Electrical characteristics TS3431 Figure 14. Pulse response at IK = 10mA Figure 15. Test circuit for pulse response at IK = 10mA 5.0 Input Voltage T=+25C ... 270 Output voltage Output 4V 2.5 Intput Voltage (V) IK=10mA 0 ... 0.0 0 2 4 6 8 Time (s) Figure 16. Phase and gain vs frequency Figure 17. Equivalent input noise vs frequency Phase () 80 300 VK = VREF IK = 10 mA T = +25C Noise (nV / Hz) 40 0 40 Gain (dB) T = +25C 200 100 20 0 1000 10000 100000 1000000 Figure 18. Test circuit for phase and gain measurement 4.3 K Intput Output IK=10mA 6.8 K 10 F 6/10 1 10 100 Frequency (kHz) Frequency (Hz) 10 F 0 0.1 1000 10000 TS3431 4 Package information Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. 7/10 Package information TS3431 Figure 19. SOT23-3L package mechanical data Dimensions Ref. Millimeters Min. Typ. Mils Max. Min. Typ. A 0.890 1.120 35.05 44.12 A1 0.010 0.100 0.39 3.94 A2 0.880 1.020 34.65 b 0.300 0.500 11.81 19.69 C 0.080 0.200 3.15 7.88 D 2.800 3.040 110.26 E 2.100 2.64 82.70 E1 1.200 1.400 47.26 0.950 2.900 1.300 37.41 114.17 51.19 0.950 37.41 e1 1.900 74.82 0.400 L1 k 0.600 15.75 0.540 0 40.17 119.72 103.96 e L 55.13 23.63 21.27 8 0 8 7110469/A 8/10 Max. TS3431 5 Ordering information Ordering information s Table 4. Order codes Part number TS3431ILT TS3431AILT TS3431BILT TS3431CILT 6 Temperature range -40C, +125C Package SOT23-3L Packaging Marking Tape & reel L280 L281 L282 L283 Revision history Date Revision Changes 1-Jan-2004 1 Initial release. 1-Dec-2004 2 Specific content changes as follows: - CI version added in Table 4: Order codes. - Rthjc information added in Table 1: Absolute maximum ratings (AMR). - Test condition added in electrical characteristics Table 3. 26-Jun-2007 3 Removed TO-92 package information and associated order codes. Re-ordered electrical characteristics figures. 9/10 TS3431 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 10/10