TS3431AILT

TS3431 1.24V programmable shunt voltage reference Features ■ ■ ■ ■ ■ Adjustable output voltage: 1.24 to 24V Several precision levels @ 25°C ±2%, ±1%, ±0.5% and ±0.25% Sink current capability: 0.4 to 100mA Industrial temperature range: -40°C to +125°C Performance compatible with industry standard TL431 L SOT23-3L (Plastic micropackage) Applications ■ ■ ■ ■ ■ Computers Instrumentation Battery chargers Switch mode power supply Battery operated equipment Reference SOT23-3 (top view) 1 TS3431 Description The TS3431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire operating temperature range (-40°C to +125°C). The output voltage can be set to any value between 1.24V and 24V with an external resistor bridge. Available in SOT23-3 surface mount package, it can be used in application designs where space saving is critical. Cathode 3 Anode 2 June 2007 Rev 3 1/10 www.st.com 10 Block diagram TS3431 1 Block diagram Figure 1. Block diagram Cathode Reference + - VREF Anode 2 Absolute maximum ratings Table 1. Symbol VKA IK IREF Pd Tstg ESD Machine model (MM) Tlead Lead temperature (soldering, 10 seconds) 200 250 V °C Absolute maximum ratings (AMR) Parameter Cathode to anode voltage Reverse breakdown current Reference current Power dissipation (1)SOT23-3L Storage temperature Human body model (HBM) Value 25 -100 to +150 -0.05 to10 360 -65 to +150 2 Unit V mA mA mW °C kV 1. Pd is calculated with Tamb = 25°C, Tj = 150°C, Rthjc = 110°C/W, Rthja = 340°C/W. Table 2. Symbol IK VK Toper Operating conditions Parameter Cathode operating current Cathode operating voltage Operating free air temperature range Value 0.5 to 100 1.24 to 24 -40 to +125 Unit mA V °C 2/10 TS3431 Electrical characteristics 3 Table 3. Symbol Electrical characteristics Tamb = 25°C (unless otherwise specified)(1) Parameter Test conditions TS3431 (2%) TS3431A (1%) VK Reference input voltage IK = 10mA TS3431B (0.5%) TS3431C (0.25%) 0°C < T < +70°C ΔVK Variation of reference input voltage over temperature Temperature coefficient Minimum operating current -40°C < T < +125°C IK=10mA Ratio of change in reference input voltage to change in cathode to anode VK= 24 to 1.24V voltage -40°C < T < +125°C Reference input current IK=10mA, R1=10KΩ, R2=+ ∞ Reference input current deviation IK=10mA, R1=10KΩ, R2=+ T= 25°C -40°C < T < +125°C 0°C < T < +70°C -40°C < T < +125°C T= 25°C IOFF Off-state cathode current VK=24V -40°C < T < +105°C -40°C < T < +125°C RKA EN Reverse static impedance Wideband noise IK = 1 to 100mA IK = 10mA 1kHz < f < 100kHz 0.2 100 0.5 0.9 35 1.2 0.5 1.5 mV/V 2 0.9 1.5 µA 2 1 µA 1.5 500 1000 2000 0.4 W nV/√ Hz nA -40°C < T < +105°C -40°C < T < +125°C TC IKmin -40°C < T < +125°C T = 25°C 0.35 Min. 1.215 1.228 1.24 1.234 1.237 1.246 1.243 10 18 21 100 0.4 mA ppm/°C mV Typ. Max. 1.265 1.252 V Unit Δ Vref --------------Δ Vka IREF ΔIREF 1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. 3/10 Electrical characteristics TS3431 Figure 2. 1.250 Voltage Reference (V) Reference voltage vs. temperature Figure 3. Test circuit for VK = Vref Input 1.245 Output Ik 1.240 IK = 10mA VK = VREF Vka 1.235 Vref 1.230 -40 0 40 Temperature (°C) 80 120 Figure 4. Cathode voltage vs cathode current Figure 5. Minimum operating current vs temperature Cathode voltage VK (V) IKMIN (mA) Minimum operating current 1.5 0.5 T=-40°C 1.0 0.4 0.3 VK = VREF 0.2 0.5 T=+25°C T=+125°C 0.1 0.0 0.0 0.1 0.2 Cathode current IK (mA) 0.3 0.4 0.0 -40 0 40 Temperature (°C) 80 120 Figure 6. Reference input current vs temperature Figure 7. Dynamic impedance vs frequency 1.00 Reference current IREF (µA) Dynamic impedance ZKA (Ω ) 0.5 VK = VREF T=+25°C 0.4 0.75 0.3 0.50 0.2 0.25 0.1 0.00 -40 0 40 Temperature (°C) 80 120 0.0 10 100 1000 10000 Frequency (Hz) 4/10 TS3431 Electrical characteristics Figure 8. Off-state current vs temperature Figure 9. Test circuit for off-state current measurement 300 OFF State Current IOFF (nA) Vka=24V 200 Ioff 100 0 -40 0 40 Temperature (°C) 80 120 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 Ik (mV/V) 1.5 R1 Iref 1.0 Δ VREF / Δ VK 0.5 Δ VK = 1.24 to 24V IK = 10 mA R2 Vref 0.0 -40 0 40 Temperature (°C) 80 120 Vka = Vref . (1+R1/R2) + Iref . R1 Figure 12. Pulse response at IK=1mA Figure 13. Test circuit for pulse response at IK = 1mA 5.0 Input Voltage ... Voltage (V) T=+25°C 2.7K Ω IK=1mA 4V Output voltage ... 0 0.0 0 2 4 Time (µs) 6 8 Output Intput 2.5 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 ... Voltage (V) T=+25°C 270 Ω IK=10mA 4V Output voltage ... 0 0.0 0 2 4 Time (µs) 6 8 Figure 16. Phase and gain vs frequency Figure 17. Equivalent input noise vs frequency 300 VK = VREF IK = 10 mA T = +25°C 200 80 Phase (°) 40 Noise (nV / √ Hz) 0 40 Gain (dB) T = +25°C 20 100 0 1000 10000 100000 1000000 0 0.1 1 10 100 1000 10000 Frequency (Hz) Frequency (kHz) Figure 18. Test circuit for phase and gain measurement 10 µF Intput 6/10 4.3 K Ω Output 10 µF IK=10mA 6.8 K Ω Output Intput 2.5 TS3431 Package information 4 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® 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 Figure 19. SOT23-3L package mechanical data Dimensions Ref. Min. A A1 A2 b C D E E1 e e1 L L1 k 0° 0.400 0.540 8° 0° 0.890 0.010 0.880 0.300 0.080 2.800 2.100 1.200 1.300 0.950 1.900 0.600 15.75 21.27 2.900 0.950 Millimeters Typ. Max. 1.120 0.100 1.020 0.500 0.200 3.040 2.64 1.400 Min. 35.05 0.39 34.65 11.81 3.15 110.26 82.70 47.26 51.19 37.41 74.82 114.17 37.41 Mils Typ. TS3431 Max. 44.12 3.94 40.17 19.69 7.88 119.72 103.96 55.13 23.63 8° 7110469/A 8/10 TS3431 Ordering information 5 Ordering information Table 4. s Order codes Part number Temperature range Package Packaging Marking L280 L281 L282 L283 TS3431ILT TS3431AILT TS3431BILT TS3431CILT -40°C, +125°C SOT23-3L Tape & reel 6 Revision history Date 1-Jan-2004 Revision 1 Initial release. 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. Removed TO-92 package information and associated order codes. Re-ordered electrical characteristics figures. Changes 1-Dec-2004 2 26-Jun-2007 3 9/10 TS3431 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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