Low Voltage(1.24V) Adjustable Precision Shunt Regulator

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Egbert Ball
5 years ago
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1 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 SOT-23 PKG T O P 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-89 PKG TOP 1 3 DESCRIPTION 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. TOP PIN 1. Reference 2. Anode 3. Cathode ORDERING INFORMATION Device Package TL432TA TO-92(Taping) TL432SF SOT-23 3L TL432F SOT-89 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 Cathode Voltage V KA - 20 V Cathode Current Range(Continuous) I K ma Reference Input Current Range I REF - 3 ma Junction Temperature Range T J Operating Temperature Range T OPR Storage Temperature Range T STG Total Power Dissipation P D 770 mw Mar Rev HTC

2 RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC SYMBOL MIN. MAX. UNIT Cathode Voltage V KA V REF 18 V Cathode Current I K ma Ordering Information V REF Package Tolerance Order No. Marking Supplied As Status TO % 1% TL432CTA TL432-C Tape Active TL432GCTA TL432GC Tape Contact us TL432ATA TL432-A Tape Active TL432GATA TL432GA Tape Contact us 1.24V SOT % 1% TL432CSF 432 Reel Active TL432GCSF 432 Reel Active TL432ASF 432 Reel Active TL432GASF 432 Reel Active SOT % 1% TL432CF 432 Reel Active TL432GCF 432 Reel Active TL432AF 432 Reel Active TL432GAF 432 Reel Active TL Package Type Tolerance Green Mode TA: TO-92 SF: SOT-23 F: SOT-89 C: 0.5% A: 1% G: Halogen Free Blank: Pb Free Root Name Product Code Mar Rev HTC

3 FUNCTION BLOCK DIAGRAM CATHODE (K) REFERENCE + - CATHODE REFERENCE (R) 1.24 V REF ANODE ANODE (A) EQUIVALENT SCHEMATIC * All component values are nominal. Mar Rev HTC

4 PIN CONFIGURATION Marking Side 2 TOP TOP TO-92 PKG SOT-23 PKG SOT-89 PKG PIN DESCRIPTION Pin No. Name TO-92 / SOT-23 / SOT-89 Function 1 Reference Reference Voltage 2 Anode Ground 3 Cathode Input Supply Voltage ELECTRICAL CHARACTERISTICS (T A=25, unless otherwise specified) CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Reference Input Voltage V REF V KA =V REF, I K =10mA TL432C TL432A V Deviation of Reference Input Voltage ΔV REF/ΔT V KA = V REF, I K =10mA T A =Full Range mv Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage ΔV REF/ΔV KA V KA = 1.25V to 14.5V mv/v Reference Input Current I REF R1=10 kω, R2= ua Deviation of Reference Input Current ΔI REF/ΔT R1=10 kω, R2=, T A = Full Range ua Minimum Cathode Current for Regulation I K(MIN) V KA = V REF ua Off-State Cathode Current I K(OFF) V KA =16V, V REF = ua Dynamic Impedance Z KA V KA= V REF, I K =0.1mA~100mA f 1kHz Ω Mar Rev HTC

5 TEST CIRCUITS V IN V KA = V REF V IN V KA I REF V REF I K C O 0.1uF R1 R2 I REF V REF I K C O 0.1uF < Fig 1. Test circuit for V KA = V REF > < Fig 2. Test circuit for V KA V REF > V IN V KA I K < Fig 3. Test circuit for I KA(OFF) > The deviation parameters ΔV REF/ΔT and ΔI REF/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, αv REF, is defined as : αv REF ( V (ppm/ ) = REF VI(dev) ) 10 at 25 ΔT A 6 Where : ΔT A is the recommended operating free-air temperature range of the device. Mar Rev HTC

6 αv REF can be positive or negative, depending on whether minimum V REF or maximum V REF, respectively, occurs at the lower temperature. Example: Maximum V REF =1190mV at 30, maximum V REF =1262mV at 0, V REF =1241mV at 25, ΔT A =125 for TL432C. αv REF 72mV ( ) 10 = 1241mV ppm/ Because minimum V REF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as : Z KA ΔV = ΔI KA KA When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by: ' Z ΔV = Z ΔI KA ( ) 1+R1/R2 Mar Rev HTC

7 TYPICAL OPERATING CHARACTERISTICS Reference Voltage vs. Junction Temperature Stability Boundary Conditions 150Ω IKA-Cathode Current (ma) UNSTABLE D C C L -Load Capacitance (nf) A STABLE B R1 R2 < Fig 4. Test Circuit > C L A V KA=V REF R1= 0Ω, R2 = B V KA=5.0V, R1=10kΩ, R2 = 3.3kΩ C V KA=10.0V R1=10kΩ, R2 = 1.42kΩ D V KA=15.0V R1=10kΩ, R2 = 900Ω Mar Rev HTC

8 REVISION NOTICE The description in this data sheet can be revised without any notice to describe its electrical characteristics properly. Mar Rev HTC

3-TERMINAL 0.1A NEGATIVE VOLTAGE REGULATOR

3-TERMINAL 0.1A NEGATIVE VOLTAGE REGULATOR 3-TERMINAL A NEGATIE OLTAGE REGULATOR FEATURES Output Current Up to 1 No External Components Internal Thermal Overload Protection Internal Short-Circuit Limiting Output oltage of 5, 6, 8, 9, 12, 15, 18