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Low Voltage(1.24V) Adjustable Precision Shunt Regulator
PROGRAMMABLE PRECISION REFERENCES
The TL432A is a three-terminal Shunt Voltage Reference providing a highly accurace 1.24 V, 1.25V bandgap reference with 1.0 % tolerance. The TL432A 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 TL432A is an ideal voltage reference in an isolated feed circuit for 3.0V to 3.3V switching mode power supplies.
TO-92 (Top View)
TL432/ A / C
3.Cathode 2.Anode 1.Reference
SOT-23 (Front View)
2.Anode
FEATURES
Low Voltage Operation : 1.24 V Programmable Out Voltage to 15V Sink Current Capability of 1 mA to 100 mA Equivalent Full-Range Temperature Coefficient of 50 ppm/ Temperature Compensated for Operation over Full Rated Operating Temperature Range Trimmed Bandgap to 5% ESD Protection : 2kV

1.Reference 3.Cathode
ORDERING INFORMATION
Device TL432-A TL432-C TL432-ASF TL432-CSF Marking TL432-A TL432-C 432 Package TO-92 SOT-23
APPLICATION
Shunt Regulator Voltage Monitoring Current Source and Sink Circuits Anolog and Digital Circuits Requiring Precision References Low Out Voltage (3.0V to 3.3V) Switching Power Supply Error Amplifier

FUNCTION BLOCK DIAGRAM
CATHODE REFERENCE + REFERENCE(R) 1.24VREF
CATHODE(K)
ANODE(A)
ANODE
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Low Voltage(1.24V) Adjustable Precision Shunt Regulator
EQUIVALENT SCHEMATIC
TL432/ A / C
All component values are nominal
RECOMMENDED OPERATING CONDITIONS
CHARACTERISTIC Cathode Voltage Cathode Current SYMBOL VKA IK MIN. VREF 1 MAX. 15 100 UNIT V
DISSIPATION RATING TABLE1-FREE-AIR TEMPERATURE
Package TO-92 SOT-89 SOT-23 TA=25 Power Rating 770 230 Derating Factor Above TA=25 6.2/ 1.8/ TA=70 TA=85 TA=125
Power Rating Power Rating Power Rating 491 398 149 122
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Low Voltage(1.24V) Adjustable Precision Shunt Regulator
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 15 100 -0.05 ~ 3 -40 ~ 150 0 ~70 -65~+150 770
TL432/ A / C
UNIT V
TL432A/C ELECTRICAL CHARACTERISTICS
CHARACTERISTIC Reference Input Voltage Deviation of Reference Input Voltage Over Full Temperature Range Ratio of Change in Reference Input Voltage
VREF/VKA
(TA=25, unless otherwise specified)
TEST CONDITION VKA=VREF, IK=10 VKA=VREF, IK=10 TL432A TL432C MIN. 1.228 1.24 1.233 1.247 TYP. MAX. 1.252 V UNIT
SYMBOL VREF
VREF/T
TA=Full Range
10
25
to the Change in Cathod Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance IKAMIN IREF/T IREF
VKA=1.25V to 14.5V
1.0
2.7
/V
R1=10, R2=
0.5
1
R1=10, R2=, Ta = Full Range
0.05
0.3
Vka=Vref
60
80
IKAOFF
VKA=15V, V REF=0
0.04
0.5
ZKA
VKA=VREF, IK=0.1~20, f1.0
0.2
0.4
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Low Voltage(1.24V) Adjustable Precision Shunt Regulator
TL432/ A / C
Fig. 1 Test Circuit for V
KA =V REF
Fig. 2 Test Circuit for V
KA V REF
INPUT
IKA
VKA
INPUT
IKA
VKA
R1 DUT
REF
DUT
VREF
1 uF
R2
VREF VKA=VREF(1+R1/R2)+IREF R1
Fig. Test Circuit for IKA off)
INPUT IKA(OFF) VKA
DUT
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Low Voltage(1.24V) Adjustable Precision Shunt Regulator
TL432/ A / C
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 TL431C 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'=
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