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UNISONIC TECHNOLOGIES CO., LTD TL431
PROGRAMMABLE PRECISION REFERENCE
.
1
LINEAR INTEGRATED CIRCUIT
1
DESCRIPTION
The UTC TL431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5V) and 36 V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others.
SOT-89
TO-92
SOP-8
3 3 1 2 1
5 4
2
FEATURES
*Programmable output Voltage to 36V. *Low dynamic output impedance 0.2. *Sink current capability of 1.0 to 100mA. *Equivalent full-range temperature coefficient of 50ppm/ C typical for operation over full rated operating temperature range.
SOT-23
SOT-25
*Pb-free plating product number: TL431K *Pb-free plating product for SOT-23NS type number: TL431NSL
ORDERING INFORMATION
Order Number Pin Assignment Package Normal Lead Free Plating 12345678 TL431-AB3-R TL431K-AB3-R RAK- - - - SOT-89 TL431-AE3-R TL431K-AE3-R KRA- - - - SOT-23 TL431NS-AE3-R TL431NSL-AE3-R RKA- - - - SOT-23 TL431-AF5-R TL431K-AF5-R XXKRA- - SOT-25 TL431-S08-R TL431K-S08-R KAAXXAAR SOP-8 TL431-S08-T TL431K-S08-T KAAXXAAR SOP-8 TL431-T92-B TL431K-T92-B RAK- - - - TO-92 TL431-T92-K TL431K-T92-K RAK- - - - TO-92 TL431-T92-R TL431K-T92-R RAK- - - - TO-92 Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection TL431K-AB3-R (1)Packing Type (2)Package Type (3)Lead Plating Packing Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tube Tape Box Bulk Tape Reel
(1) B: Tape Box, K: Bulk, R: Tape Reel, T: Tube (2) AB3: SOT-89, AE3: SOT-23, AF5: SOT-25, S 08:SOP-8, T92: TO-92 (3) K: Lead Free Plating, Blank: Pb/Sn L : Lead Free Plating Only for SOT-23NS Type ,
MARKING (SOT-23/SOT-25)
431 431N
Lead Plating
Lead Plating
For TL431
For TL431NS
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd
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BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
CATHODE REFERENCE CATHODE (K) REFERENCE (R)
2.5V VREF
ANODE(A)
ANODE
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PARAMETER
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified)
RATINGS UNIT Cathode Voltage 37 V Cathode Current Range(Continuous) -100 ~ +150 mA Reference Input Current Range -0.05 ~ +10 mA TO-92 770 mW Power Dissipation PD SOT-89 800 mW SOT-23/SOT-25 300 mW Operating Junction Temperature TJ +150 C Operating Ambient Temperature TOPR -40 ~ +85 C Storage Temperature TSTG -65 ~ +150 C Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. SYMBOL VKA IKA IREF
RECOMMENDED OPERATING CONDITIONS
PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IKA MIN VREF 1 TYP MAX 36 100 UNIT V mA
ELECTRICAL CHARACTERISTICS (TC= 25 , unless otherwise specified.)
PARAMETER Reference Input Voltage Deviation of reference Input Voltage Over temperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance SYMBOL TEST CONDITIONS VREF VKA=VREF,IKA=10mA VKA=VREF,IKA=10mA VREF/T 0C Ta 70C VKA=10V~VREF VREF/VKA IKA=10mA VKA=36V~10V IREF IKA=10mA, R1=10k, R2= IKA=10mA, R1=10k, R2= IREF/T Ta =full Temperature IKA(MIN) VKA=VREF IKA(OFF) VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA ZKA f1.0kHz MIN TYP MAX UNIT 2.470 2.495 2.520 V 4.5 -1.0 -0.5 1.5 0.4 0.45 0.05 0.15 17 -2.7 -2.0 4 1.2 1.0 1.0 0.5 mV mV/V A A mA A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL CHARACTERISTICS
Cathode Current vs . Cathode Voltage
LINEAR INTEGRATED CIRCUIT
Cathode Current vs . Cathode Voltage
800
125
Cathode Current (mA)
100 75 50 25 0 -25 -50 -75 -100 -2
Cathode Current (mA)
Ta=25C VKA=VREF
600
Ta=25C VKA=VREF
400 IKA(MIN) 200
0
-200 -1 0 1 2 3 -2 -1 0 1 2 3
Cathode Voltage (V)
Cathode Voltage (V)
0
Change in Reference Input Voltage vs . Cathode Voltage
7
Pulse Response
Ta=25C
Change In Reference Input Voltage (mV)
-5
Input and Output Voltage (V)
40
-10 -15 -20 -25 -30 -35 -40 0 5 10 15 20 25
IKA=100mA Ta=25C
6 5 4 3 2 1 0
30
35
0
1
2
3
4
5
6
7
Cathode Voltage (V)
Time (
s)
Dynamic Impedance vs . Frequency
10
2
Small Signal Voltage Amplification vs . Frequency
70
Ta=25C IKA=0mA to 100mA
60
Ta=25C IKA=10mA
Impedance (
10
1
Voltage Amplification (dB)
3 4 5 6 7
50 40 30 20 10 0
10
0
10
-1
10
10
10
10
10
-10 3 10
10
4
10
5
10
6
10
7
Frequency (Hz)
Frequency (Hz)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL CHARACTERISTICS (Cont.)
2.52 2.51
LINEAR INTEGRATED CIRCUIT
Reference Voltage
2.5 2.49 2.48 2.47 2.46 2.45
0 C 0 C 0 C 20 40 60 -4 -2 80
1
Temperature
140 120 A VKA=Vref B VKA=5.0V@IK=10mA C VKA=10V@IK=10mA D VKA=15V@IK=10mA Ta=25 A B
Cathode Current, IK (mA)
100 80 60
C
unstable stable stable
D
40 20 0 100p 1n 10n 100n
10
10
Load Capacitance, CL
UNISONIC TECHNOLOGIES CO., LTD
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0 C
C
C
C
C
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TEST CIRCUIT
VKA IKA R1
UTC TL431
LINEAR INTEGRATED CIRCUIT
INPUT
INPUT IKA
VKA
INPUT
VKA IKA(OFF)
IREF
UTC TL431 UTC TL431
VREF
R2
VREF
VKA=VREF*(1+R1/R2)+IREF*R1
For VKA=VREF
For VKA
VREF
For IKA(OFF)
APPLICATION CIRCUIT
VIN
IN
VIN
VoUT
VIN UTC7805
COMMON OUT R1
VoUT
VoUT
R1
R1
VREF
R2
UTC TL431 UTC TL431
VREF
R2
VREF
R2
UTC TL431
Vo=(1+R1/R2)*VREF
Vo=(1+R1/R2)*VREF
Vo=(1+R1/R2)*VREF
Shutdown Regulator
Output Control of a Three -Terminal Fixed Regulator
Higher-current Shunt Regulator
VIN Io
VoUT
VIN
Io
RCL
VoUT
Rs
Rs
UTC TL431
UTC TL431
IO=VREF/RS
RS=VREF/RCL
Constant-current Sink
Current Limiting or Current Source
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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