TS2431 PROGRAMMABLE SHUNT VOLTAGE REFERENCE ■ ADJUSTABLE OUTPUT VOLTAGE 2.5 to 24V ■ SEVERAL PRECISION @ 25°C ±2%, ±1% and ±0.5% ■ SINK CURRENT CAPABILITY 1 to 100mA ■ INDUSTRIAL TEMPERATURE RANGE: -40 to +105°C ■ 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 +105°C). The output voltage may be set to any value between 2.5V and 24V with an external resistor bridge. L SOT23-3L (Plastic Micropackage) 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 Computers Instrumentation Battery chargers Cathode Switch Mode Power Supply Battery operated equipments 1 TS2431 ■ ■ ■ ■ ■ ORDER CODE Precision Part Number in SOT23-3 2% TS2431ILT 1% TS2431AILT 0.5% TS2431BILT Single temperature range: -40 to +105°C SOT23 Marking L285 L286 L287 Reference 3 Anode 2 SOT23-3 LT = Tiny Package (SOT23-3) - only available in Tape & Reel (LT) February 2002 1/6 TS2431 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Vka IK 25 V Reverse Breakdown Current -100 to +150 mA IREF Reference input current range -0.05 to +10 mA 360 mW Pd Cathode to Anode voltage Unit Power Dissipation 1) SOT23-3 Tstd Storage Temperature -65 to +150 °C ESD Human Body Model (HBM) Machine Model (MM) 2 200 kV V Lead Temperatue (soldering, 10 seconds) 260 °C TLEAD 1. Pd has been calculated with Tamb = 25°C, Tjunction =150°C and Rthja = 340°C/W for the SOT23-3 package OPERATING CONDITIONS Symbol VKA IK Toper Parameter Value Cathode to Anode voltage 1) Cathode operating current Operating Free Air Temperature Range Unit VREF to 24 V 1 to 100 mA -40 to +105 °C 1. Maximum power dissipation must be strictly observed to avoid the component destruction. ELECTRICAL CHARACTERISTICS TAMBIENT = 25°C (unless otherwise specified) Symbol VREF |∆VREF| TC IKMIN ∆Vref --------------∆Vk Parameter Test Condition Reference input Voltage VK=VREF, IK=10mA Reference input Voltage deviation over temperature, VK=VREF, IK=10mA (note 1,2) TS2431 (2%) TS2431A (1%) TS2431B (0.5%) 0°C < T < +70°C -40°C < T < +85°C -40°C < T < +105°C Temperature coefficient (note 2) Minimum Operating Current Min. Typ. Max. Unit 2.5 10 17 20 2.55 2.525 2.512 20 30 35 -40°C < T < +105°C 50 100 ppm/°C T = 25°C -40°C < T < +105°C 0.3 0.8 1 mA 0.3 2 mV/V Ratio of change in reference input I =10mA voltage to change in cathode to anode K Vka= 24 to 2.5V voltage 2.45 2.475 2.488 V mV IREF Reference input current IK=10mA, R1=10KΩ, R2=+ ∞ (note 3) T=25°C -40°C < T < +105°C 0.5 2.5 3 µA |∆IREF| Reference input current deviation IK=10mA, R1=10KΩ, R2=+ ∞ (note 3) -40°C < T < +105°C 0.4 1.2 µA Off-state cathode current VK=24V, VREF=GND 10 500 nA Reverse dynamic impedance VK=VREF ∆IK=1 to 50mA, f<10kHz 0.5 0.75 Ω Wide Band Noise Ik = 10mA 10Hz < f < 10kHz 300 IOFF |ZKA| EN nV/√Hz Note 1: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design. |∆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 Note 2: 2/6 TS2431 Reference voltage vs temperature Test circuit for Vka = Vref Voltage reference (V) 2.52 Ik =10 mA Vka = Vref Input Output 2.51 Ik 2.50 Vka 2.49 Vref 2.48 -40 -20 0 20 40 60 80 100 Temperature (°C) Cathode voltage vs cathode current Cathode voltage vs cathode current 3 Vka Cathode voltage (V) Vka Cathode voltage (V) 3 2 Vka = Vref T=25°C 1 0 T=-40°C 2 T=+25°C 1 T=+105°C Vka = Vref -1 -0.10 -0.05 0.00 0.05 0 0.10 0 100 Ika Cathode current (A) Reference input current (µA) 1.00 Ik=10mA R1=10KΩ R2=+∞ 0.50 0.25 0.00 -40 300 400 Dynamic impedance vs frequency Zka Dynamic impedance (Ohms) Reference input current vs temperature 0.75 200 Ik Cathode current (µA) 5 4 Vka=Vref Ik=1mA T=25°C 3 2 1 -20 0 20 40 Temperature (°C) 60 80 100 0 10 100 1000 10000 100000 1000000 Frequency (Hz) 3/6 TS2431 Test circuit for Off-State current measurement Off-State current vs temperature 0.3 Off-state current (µA) Vka=24V 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 Test circuit for Vka > Vref 0.4 ∆Vref / ∆Vka (mV/V) Input Vka Ik 0.3 ∆Vka=24 to 2.5V Ik=10mA T=25°C R1 Iref 0.2 R2 0.1 0.0 -40 -20 0 20 40 60 80 100 Vref Vka = Vref . (1+R1/R2) + Iref . R1 Temperature (°C) Phase and Gain vs frequency 4/6 Test circuit for phase and gain measurement TS2431 Pulse response at Ik=1mA Test circuit for pulse response at Ik = 1mA 6 Input voltage 2.5 KΩ 2 Output Pulse Generator F=100kHz 0 to 5V Output voltage Intput Voltage (V) Ik=1mA 4 Ik= 0 to 1mA T=25°C 0 0.0 0.5 1.0 1.5 2.0 Time (µs) Pulse response at Ik = 1mA Equivalent input noise vs frequency 6 300 250 4 Noise (nV / √ Hz) Voltage (V) Input voltage Ik= 1mA to 0 T=25°C 2 Output voltage 200 150 Vka=Vref Ik=1mA T=25°C 100 50 0 0.0 0.5 1.0 1.5 2.0 0 0.1 Time (µs) 1 10 100 1000 Frequency (KHz) Stability boundary conditions Block Diagram Cathode current (mA) 100 80 Stable area 60 Vka=3 V 40 20 0 1E-10 Instable area Vka=2.5 V 1E-9 1E-8 1E-7 Vka=5 V 1E-6 1E-5 Capacitive load (F) 5/6 TS2431 PACKAGE MECHANICAL DATA 3 PINS - TINY PACKAGE (SOT-23) D k GAUGE PLANE e L E E1 L1 0.25 b c C e1 0.10 SEATING PLANE A1 A A2 C Millimeters Inches 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 0.400 0° Typ. 0.950 2.900 1.300 0.950 1.900 0.500 0.540 Max. Min. 1.120 0.100 1.020 0.500 0.200 3.040 2.640 1.400 0.035 0.0004 0.600 0.016 Typ. 0.037 0.012 0.003 0.110 0.083 0.047 0.114 0.051 0.037 0.075 0.020 0.021 Max. 0.044 0.004 0.040 0.020 0.008 0.120 0.104 0.055 0.024 8° 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. 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