TL432SF

Low Voltage(1.24V) Adjustable Precision Shunt Regulator FEATURES Low Voltage Operation : 1.24 V Programmable Out Voltage to 18V Sink Current Capability of 1mA to 100mA Equivalent full range Temperature Coefficient of 50ppm/℃ Temperature Compensated for operation over full rated operating Temperature Range Low Output Noise Voltage Moisture Sensitivity Level 3 TO-92 PKG TL432/A/C 3 T O P 2 1 APPLICATION Shunt Regulator Voltage Monitoring Current Source and Sink Circuits Analog & Digital Circuits Requiring Precision References Low Out Voltage (3.0V to 3.3V) Switching Power Supply Error Amplifier SOT-23 PKG 2 TOP 1 3 DESCRIPSION The TL432 is a three-terminal Shunt Voltage Reference providing a highly accuracy 1.24V band-gap reference with 0.5% and 1.0% tolerance. The TL432 thermal stability and wide operating current(100mA) makes is suitable for all variety of applications that are looking for a low cost solution with high performance. The TL432 is an ideal voltage reference in an isolated feed circuit for 3.0V to 3.3V switching mode power supplies. PIN 1. Reference 2. Anode 3. Cathode ORDERING INFORMATION Device TL432TA TL432SF Package TO-92(Taping) SOT-23 3L * Refer to the page 2 for detailed ordering Information, Absolute Maximum Ratings (Full operating ambient temperature range applies unless otherwise noted.) CHARACTERISTIC Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range Junction Temperature Range Operating Temperature Range Storage Temperature Range Total Power Dissipation SYMBOL VKA IK IREF TJ TOPR TSTG PD MIN. -40 -40 -65 770 MAX. 20 100 3 150 125 150 UNIT V mA mA ℃ ℃ ℃ mW Sep. 2010 – Rev.1.5 -1- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC Cathode Voltage Cathode Current TL432/A/C UNIT V mA SYMBOL VKA IK MIN. VREF 0.1 MAX. 18 100 Ordering Information VREF Package TO-92 Tolerance 0.5% 1% 0.5% Order No. TL432CTA TL432ATA TL432CSF TL432GCSF TL432ASF TL432GASF Marking TL432-C TL432-A 432 432 432 432 Supplied As Tape Tape Reel Reel Reel Reel Status Active Active Active Contact us Active Contact us 1.24V SOT-23 1% Sep. 2010 – Rev.1.5 -2- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator FUNCTION BLOCK DIAGRAM TL432/A/C CATHODE (K) CATHODE REFERENCE + 1.24 VREF REFERENCE (R) ANODE (A) ANODE EQUIVALENT SCHEMATIC * All component values are nominal. Sep. 2010 – Rev.1.5 -3- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator PIN CONFIGURATION Marking Side 2 TL432/A/C TOP 1 123 3 TO-92 PKG SOT-23 PKG PIN DESCRIPTION Pin No. 1 2 3 TO-92 / SOT-23 Name Reference Anode Cathode Function Reference Voltage Ground Input Supply Voltage TL432 ELECTRICAL CHARACTERISTICS (TA=25℃, unless otherwise specified) CHARACTERISTIC Reference Input Voltage SYMBOL VREF TEST CONDITION VKA =VREF, IK =10mA VKA = VREF, IK =10mA TA =Full Range TL432C TL432A MIN. 1.234 1.228 TYP. 1.240 1.240 15 MAX. 1.246 1.252 25 UNIT V Deviation of Reference Input Voltage Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance ΔVREF/ΔT mV ΔVREF/ΔVKA VKA = 1.25V to 14.5V 1.0 2.7 mV/V IREF ΔIREF/ΔT R1=10㏀, R2=∞ R1=10㏀, R2=∞, TA = Full Range VKA = VREF VKA =16V, VREF =0 VKA= VREF, IK =0.1mA~100mA f ≤ 1kHz 0.25 0.05 0.5 0.3 uA uA IK(MIN) IK(OFF) ZKA 60 0.04 0.2 80 0.5 0.4 uA uA Ω Sep. 2010 – Rev.1.5 -4- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator TEST CIRCUITS TL432/A/C VIN VKA = VREF VIN VKA IREF IK CO 0.1uF R1 IK IREF CO 0.1uF VREF R2 VREF < Fig 1. Test circuit for VKA = VREF > < Fig 2. Test circuit for VKA ≥ VREF > VIN VKA IK < Fig 3. Test circuit for IKA(OFF) > The deviation parameters ΔVREF/ΔT and ΔIREF/ΔT are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage, αVREF, is defined as : VI(dev) ) × 10 6 VREF at 25℃ αVREF (ppm/ ℃) = ΔTA ( Where : ΔTA is the recommended operating free-air temperature range of the device. Sep. 2010 – Rev.1.5 -5- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432/A/C αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature. Example: Maximum VREF=1190mV at 30℃, maximum VREF=1262mV at 0℃, VREF=1241mV at 25℃, ΔTA=125℃ for TL432C. αVREF 72mV ) × 10 6 1241mV = ≈ 46ppm/ ℃ 125℃ ( Because minimum VREF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as : Z KA = ΔVKA ΔIKA When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by: Z' = ΔV ≈ Z KA (1 + R1 / R 2 ) ΔI Sep. 2010 – Rev.1.5 -6- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator TYPICAL OPERATING CHARACTERISTICS Reference Voltage vs. Junction Temperature TL432/A/C Stability Boundary Conditions 100 90 80 150Ω IKA-Cathode Current (mA) R1 CL R2 UNSTABLE STABLE B C D 0.1 1 10 100 1000 10000 70 60 50 40 30 20 10 0 A < Fig 4. Test Circuit > A VKA=VREF R1= 0Ω, R2 = ∞ B VKA=5.0V, R1=10kΩ, R2 = 3.3kΩ C VKA=10.0V R1=10kΩ, R2 = 1.42kΩ D VKA=15.0V R1=10kΩ, R2 = 900Ω C L-Load Capacitance (nF) Sep. 2010 – Rev.1.5 -7- HTC