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| TS2431 PROGRAMMABLE SHUNT VOLTAGE REFERENCE s ADJUSTABLE OUTPUT VOLTAGE 2.5 to 24V s SEVERAL PRECISION @ 25C 2%, 1% and 0.5% s SINK CURRENT CAPABILITY 1 to 100mA s INDUSTRIAL TEMPERATURE RANGE: -40 to +105C s PERFORMANCES COMPATIBLE WITH INDUSTRY STANDARD TL431 DESCRIPTION The TS2431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire temperature range of operation (-40 to +105C). The output voltage may be set to any value between 2.5V and 24V with an external resistor bridge. Available in SOT23-3 surface mount package, it can be designed in applications where space saving is a critical issue. PIN CONNECTIONS (top view) APPLICATION L SOT23-3L (Plastic Micropackage) TS2431 s s s s s Computers Instrumentation Battery chargers Switch Mode Power Supply Battery operated equipments Cathode 1 3 Anode ORDER CODE Precision Part Number in SOT23-3 SOT23 Marking L285 L286 L287 Reference 2 2% TS2431ILT 1% TS2431AILT 0.5% TS2431BILT Single temperature range: -40 to +105C SOT23-3 LT = Tiny Package (SOT23-3) - only available in Tape & Reel (LT) February 2002 1/6 TS2431 ABSOLUTE MAXIMUM RATINGS Symbol Vka IK IREF Pd Tstd ESD TLEAD Cathode to Anode voltage Reverse Breakdown Current Reference input current range Power Dissipation 1) Parameter Value 25 -100 to +150 -0.05 to +10 360 -65 to +150 2 200 260 Unit V mA mA mW C kV V C SOT23-3 Storage Temperature Human Body Model (HBM) Machine Model (MM) Lead Temperatue (soldering, 10 seconds) 1. Pd has been calculated with Tamb = 25C, Tjunction =150C and Rthja = 340C/W for the SOT23-3 package OPERATING CONDITIONS Symbol VKA IK Toper Cathode to Anode voltage Cathode operating current 1) Parameter Value VREF to 24 1 to 100 -40 to +105 Unit V mA C Operating Free Air Temperature Range 1. Maximum power dissipation must be strictly observed to avoid the component destruction. ELECTRICAL CHARACTERISTICS TAMBIENT = 25C (unless otherwise specified) Symbol VREF Parameter Reference input Voltage Test Condition VK=VREF, IK=10mA TS2431 (2%) TS2431A (1%) TS2431B (0.5%) 0C < T < +70C -40C < T < +85C -40C < T < +105C -40C < T < +105C T = 25C -40C < T < +105C 2.45 2.475 2.488 10 17 20 50 0.3 Min. Typ. 2.5 2.55 2.525 2.512 20 30 35 100 0.8 1 2 2.5 3 1.2 500 0.75 V Max. Unit |VREF| TC IKMIN Reference input Voltage deviation over temperature, VK=VREF, IK=10mA (note 1,2) Temperature coefficient (note 2) Minimum Operating Current mV ppm/C mA Vref -------------Vk IREF |IREF| IOFF |ZKA| EN Ratio of change in reference input I =10mA voltage to change in cathode to anode K Vka= 24 to 2.5V voltage Reference input current IK=10mA, R1=10K, R2=+ (note 3) T=25C -40C < T < +105C -40C < T < +105C VK=24V, VREF=GND 0.3 0.5 mV/V A A nA nV/Hz Reference input current deviation IK=10mA, R1=10K, R2=+ (note 3) Off-state cathode current 0.4 10 0.5 300 Reverse dynamic impedance Wide Band Noise VK=VREF IK=1 to 50mA, f<10kHz Ik = 10mA 10Hz < f < 10kHz Note 1: Limits are 100% production tested at 25C. Limits over temperature are guaranteed through correlation and by design. Note 2: |VREF| is defined as the difference between the maximum and minimum values of VREF obtained over the full temperature range Note 3: Refer to figure "Test circuit for Vka>Vref" page 4 2/6 TS2431 Reference voltage vs temperature Test circuit for Vka = Vref 2.52 Voltage reference (V) Ik =10 mA Vka = Vref 2.51 Input Ik Output 2.50 Vka 2.49 Vref 2.48 -40 -20 0 20 40 60 80 100 Temperature (C) Cathode voltage vs cathode current 3 Cathode voltage vs cathode current 3 2 Vka Cathode voltage (V) Vka Cathode voltage (V) T=-40C 2 1 Vka = Vref T=25C T=+25C 1 T=+105C Vka = Vref 0 -1 -0.10 -0.05 0.00 0.05 0.10 0 0 100 200 300 400 Ika Cathode current (A) Ik Cathode current (A) Reference input current vs temperature 1.00 Dynamic impedance vs frequency Zka Dynamic impedance (Ohms) 5 Reference input current (A) 0.75 Ik=10mA R1=10K R2=+ 4 Vka=Vref Ik=1mA T=25C 3 0.50 2 0.25 1 0.00 -40 -20 0 20 40 60 80 100 0 10 100 1000 10000 100000 1000000 Temperature (C) Frequency (Hz) 3/6 TS2431 Off-State current vs temperature 0.3 Test circuit for Off-State current measurement Vka=24V Off-state current (A) 0.2 Ioff 0.1 0.0 -40 -20 0 20 40 60 80 100 Temperature (C) Ratio of change in reference input voltage to change in Vka voltage vs temperature 0.4 Test circuit for Vka > Vref Input Vref / Vka (mV/V) 0.3 Vka Ik Vka=24 to 2.5V Ik=10mA T=25C R1 Iref 0.2 0.1 R2 Vref 0.0 -40 -20 0 20 40 60 80 100 Vka = Vref . (1+R1/R2) + Iref . R1 Temperature (C) Phase and Gain vs frequency Test circuit for phase and gain measurement 4/6 TS2431 Pulse response at Ik=1mA 6 Input voltage Test circuit for pulse response at Ik = 1mA 2.5 K Ik=1mA Voltage (V) 4 Output voltage 2 Pulse Generator F=100kHz 0 to 5V Ik= 0 to 1mA T=25C 0 0.0 0.5 1.0 1.5 2.0 Time (s) Pulse response at Ik = 1mA 6 Input voltage 4 Ik= 1mA to 0 T=25C 2 Output voltage Equivalent input noise vs frequency 300 250 200 150 100 50 Vka=Vref Ik=1mA T=25C 0 0.0 Noise (nV / Hz) Voltage (V) 0.5 1.0 1.5 2.0 0 0.1 1 10 100 1000 Time (s) Frequency (KHz) Stability boundary conditions 100 Block Diagram Cathode current (mA) 80 Stable area 60 Vka=3 V 40 Instable area 20 Vka=2.5 V Vka=5 V 1E-6 1E-5 0 1E-10 1E-9 1E-8 1E-7 Capacitive load (F) Output Intput 5/6 TS2431 PACKAGE MECHANICAL DATA 3 PINS - TINY PACKAGE (SOT-23) D e GAUGE PLANE 0.25 k L E1 E b c e1 C A2 Millimeters Dimensions Min. A A1 A2 b c D E E1 e e1 L L1 k 0.890 0.010 0.880 0.300 0.080 2.800 2.100 1.200 Typ. Max. 1.120 0.100 1.020 0.500 0.200 3.040 2.640 1.400 Min. 0.035 0.0004 A1 A 0.10 SEATING PLANE C L1 Inches Typ. Max. 0.044 0.004 0.040 0.020 0.008 0.120 0.104 0.055 0.950 0.037 0.012 0.003 0.110 0.083 0.047 2.900 1.300 0.950 1.900 0.500 0.540 0.114 0.051 0.037 0.075 0.020 0.021 0.400 0 0.600 8 0.016 0.024 Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States (c) http://www.st.com 6/6 |
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