Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432/A/C FEATURES z z z z Low Voltage Operation : 1.24 V Programmable Out Voltage to 18V Sink Current Capability of 1mA to 100mA Equivalent full range Temperature Coefficient of TO-92 PKG 3 50ppm/℃ T O P z Temperature Compensated for operation over full rated operating Temperature Range z Low Output Noise Voltage z Moisture Sensitivity Level 3 APPLICATION z z z z z 2 1 SOT-23 PKG 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 2 TOP 1 DESCRIPSION PIN 1. Reference 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. 3 2. Anode 3. Cathode ORDERING INFORMATION Device Package TL432TA TO-92(Taping) TL432SF 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 SYMBOL MIN. MAX. UNIT VKA - 20 V IK - 100 mA IREF - 3 mA TJ -40 150 ℃ Operating Temperature Range TOPR -40 125 ℃ Storage Temperature Range TSTG -65 150 ℃ Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range Junction Temperature Range Total Power Dissipation Sep. 2010 – Rev.1.5 PD -1- 770 mW HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432/A/C RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC SYMBOL MIN. MAX. UNIT Cathode Voltage VKA VREF 18 V Cathode Current IK 0.1 100 mA Ordering Information VREF Package TO-92 Tolerance Supplied As Status TL432CTA TL432-C Tape Active 1% TL432ATA TL432-A Tape Active TL432CSF 432 Reel Active TL432GCSF 432 Reel Contact us TL432ASF 432 Reel Active TL432GASF 432 Reel Contact us SOT-23 1% Sep. 2010 – Rev.1.5 Marking 0.5% 0.5% 1.24V Order No. -2- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432/A/C FUNCTION BLOCK DIAGRAM CATHODE (K) CATHODE + REFERENCE - REFERENCE (R) 1.24 VREF 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 TL432/A/C PIN CONFIGURATION 2 Marking Side TOP 1 3 1 2 3 TO-92 PKG SOT-23 PKG PIN DESCRIPTION Pin No. TO-92 / SOT-23 Name Function 1 Reference Reference Voltage 2 Anode Ground 3 Cathode Input Supply Voltage TL432 ELECTRICAL CHARACTERISTICS (TA=25℃, unless otherwise specified) CHARACTERISTIC Reference Input Voltage Deviation of Reference Input Voltage SYMBOL VREF ΔVREF/ΔT TEST CONDITION MIN. TYP. MAX. UNIT VKA =VREF, TL432C 1.234 1.240 1.246 IK =10mA TL432A 1.228 1.240 1.252 15 25 mV VKA = 1.25V to 14.5V 1.0 2.7 mV/V R1=10㏀, R2=∞ 0.25 0.5 uA 0.05 0.3 uA 60 80 uA 0.04 0.5 uA 0.2 0.4 Ω VKA = VREF, IK =10mA TA =Full Range V Ratio of Change in Reference Input Voltage to the Change in ΔVREF/ΔVKA Cathode Voltage Reference Input Current Deviation of Reference Input Current Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance Sep. 2010 – Rev.1.5 IREF ΔIREF/ΔT R1=10㏀, R2=∞, TA = Full Range IK(MIN) VKA = VREF IK(OFF) VKA =16V, VREF =0 ZKA VKA= VREF, IK =0.1mA~100mA f ≤ 1kHz -4- HTC Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432/A/C TEST CIRCUITS VIN VIN VKA = VREF IREF IK VKA IK R1 IREF CO 0.1uF R2 VREF < Fig 1. Test circuit for VKA = VREF > VIN CO 0.1uF VREF < Fig 2. Test circuit for VKA ≥ VREF > 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. 72mV ) × 10 6 1241mV = ≈ 46ppm/ ℃ 125℃ ( αVREF 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 TL432/A/C TYPICAL OPERATING CHARACTERISTICS Reference Voltage vs. Junction Temperature Stability Boundary Conditions 100 150Ω 90 IKA-Cathode Current (mA) 80 R1 70 CL 60 R2 50 STABLE UNSTABLE 40 B 30 C 20 A < Fig 4. Test Circuit > D 10 0 0.1 1 10 100 1000 10000 C L-Load Capacitance (nF) Sep. 2010 – Rev.1.5 -7- 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 HTC