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| Low Voltage(1.24V) Adjustable Precision Shunt Regulator PROGRAMMABLE PRECISION REFERENCES TL432Z/AZ/CZ FEATURES Low Voltage Operation : 1.24 V Programmable Out Voltage to 16V Sink Current Capability of 1 mA to 100 mA Equivalent Full-Range Temperature Coefficient of 50 ppm/ Temperature Compensated for Operation over Full Rated TO-92 PKG 3.Cathode 2.Anode 1.Reference Operating Temperature Range Trimmed Bandgap to 5% SOT-23 PKG 2.Anode 1.Reference 3.Cathode APPLICATION Shunt Regulator Voltage Monitoring Current Source and Sink Circuits ORDERING INFORMATION Device Marking Anolog and Digital Circuits Requiring Precision References TL432-AZ TL432-AZ Low Out Voltage (3.0V to 3.3V) Switching Power Supply TL432-CZ TL432-CZ Error Amplifier TL432-AZSF TL432-CZSF 432 Package TO-92 SOT-23 DESCRIPTION The TL432Z/AZ/CZ is a three-terminal Shunt Voltage Reference providing a highly accuracy 1.24 V, 1.25V bandgap reference with 1.0 % tolerance. The TL432Z/AZ/CZ 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 TL432Z/AZ/CZ is an ideal voltage reference in an isolated feed circuit for 3.0V to 3.3V switching mode power supplies. Jan. 2007 - Rev 1.0 HTC 1 Low Voltage(1.24V) Adjustable Precision Shunt Regulator FUNCTION BLOCK DIAGRAM TL432Z/AZ/CZ CATHODE REFERENCE + REFERENCE(R) 1.24VREF CATHODE(K) ANODE(A) ANODE EQUIVALENT SCHEMATIC All component values are nominal Jan. 2007 - Rev 1.0 HTC 2 Low Voltage(1.24V) Adjustable Precision Shunt Regulator RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC Cathode Voltage Cathode Current SYMBOL VKA IK MIN. VREF 8 TL432Z/AZ/CZ MAX. 16 100 UNIT V DISSIPATION RATING TABLE1-FREE-AIR TEMPERATURE TA=25 Power Rating 770 230 Derating Factor Above TA=25 6.2/ 1.8/ TA=70 TA=85 TA=125 Package TO-92 SOT-23 Power Rating Power Rating Power Rating 491 149 398 122 - ABSOLUTE MAXIMUM RATINGS (Full Operating Ambient Temperature Range Applies Unless Otherwise Noted) CHARACTERISTIC Cathode Voltage Continuous Cathode Current Range Reference Input Current Range Junction Temperature Operating Temperature Storage Temperature Total Power Dissipation SYMBOL VKA IKA IREF TJ TOPR TSTG PD RATING 20 100 3 -40 ~ 150 0 ~ 70 -65~+150 770 UNIT V Jan. 2007 - Rev 1.0 HTC 3 Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432Z/AZ/CZ TL432AZ/CZ ELECTRICAL CHARACTERISTICS CHARACTERISTIC SYMBOL (TA=25, unless otherwise specified) TEST CONDITION TL432AZ MIN. 1.228 1.24 TL432CZ 1.233 1.247 TYP. MAX. 1.252 V UNIT Reference Input Voltage VREF VKA=VREF, IK=10 Deviation of Reference Input Voltage Over Full Temperature Range Ratio of Change in Reference Input Voltage VREF/VKA VKA=VREF, IK=10 VREF/T TA=Full Range 1 25 VKA=1.25V to 14.5V 1.0 2.7 /V to the Change in Cathod Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode IKAMIN Current for Regulation Off-State Cathode IKAOFF Current Dynamic Impedance ZKA VKA=VREF, IK=0.1~100, f1.0 0.05 0.15 VKA=16V, V REF=0 0.135 0.15 Vka=Vref 20 80 IREF/T R1=10, R2=, Ta = Full Range 0.10 0.4 IREF R1=10, R2= 0.15 0.5 Jan. 2007 - Rev 1.0 HTC 4 Low Voltage(1.24V) Adjustable Precision Shunt Regulator Parameter Measurement Information Fig. 1 Test Circuit for V INPUT KA =V REF TL432Z/AZ/CZ Fig. 2 Test Circuit for V INPUT KA V REF IKA VKA IKA VKA DUT R1 REF DUT VREF R2 VREF VKA=VREF(1+R1/R2)+IREF R1 Fig. Test Circuit for IKA off) INPUT IKA(OFF) VKA DUT Typical Characteristics Jan. 2007 - Rev 1.0 HTC 5 Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432Z/AZ/CZ The deviation parameters V REF(DEV) and IREF(DEF) 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, V REF, is defined as : Maximum V REF V I(dev) 6 x10 ppm VREF at 25 VREF = TA VI(dev) Minimum V REF TA Where : TA is the recommended operating free-air temperature range of the device. VREF 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=1190 at 30, maximum VREF=1262 at 0, VREF=1241 at 25, TA=125 for TL432CZ 7.2 x106 ~ 46PPM/ 1241 ~ 125 VREF= Because minimum V REF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as : ZKA= VKA IKA When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit is given by : V I ~ZKA 1+ R1 ~ R2 Z'= Jan. 2007 - Rev 1.0 HTC 6 |
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