Precision Adjustable Shunt Regulator
FEATURES
?Trimmed Bandgap to 1%? Wide Operating Current..........................1mA to 150mA ? Extended Temperature Range....................0°C to 105°C
? Low Temperature Coefficient ............................30 ppm/°C ?Offered in TO-92, SOIC, SOT-89, SOT-23-5?Improved Replacement in Performance for TL431?Low Cost Solution
APPLICATIONS
?Battery Operating Equipments?Adjustable Supplies
?Switching Power Supplies?Error Amplifiers
?Single Supply Amplifier?Monitors / VCR / TV?Personal Computers
PRODUCT DESCRIPTION
The TL431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate 1% bandgap reference. TL431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The TL431 thermal stability, wide operating current (150mA) and temperature range (0°C to 105°C) makes it suitable for all variety of application that are looking for a low cost solution with high performance.
The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The TL431 is operating in full industrial temperature range of 0°C to 105°C. The TL431 is available in TO-92, SO-8, SOT-89 and SOT23-5 packages.
PIN CONFIGURATIONS
8-Pin Surface Mount (S)SOT-89 (M1)TO-92 (N)SOT-23-5CATHODEREFCATHODEANODEANODEN/C123487REF1ANODEANODEN/C12354TL431TL4312TL4313REFANODECATHODE12365REFANODECATHODEN/CANODEN/CTop ViewFront ViewBottom ViewFront ViewRev. 10/26/00
TL431
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current
Continuous Power Dissipation at 25° C
TO-92 8L SOIC SOT-89
Junction Temperature Storage Temperature
Lead Temperature (Soldering 10 sec.)
SYMBOLVKAIAKIKAIREFPD
RATING37115010775 750 1000 150-65 to 150300
UNITSVAmAmAmW mW mW °C°C°C
TJTSTG TL
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Rev. 10/26/00
TL431
ELECTRICAL CHARACTERISTICS at 25°C Ik @ 10mA Vk=Vref, unless otherwise specified.
Parameter
Test Conditions Test TL431Symbol Unit
Circuit
Min Typ Max VREF 1 2.470 2.495 2.520 V TA = 25°C
1 2.449 2.541 Over Temp.
1TC 0.07 0.20 mV/°C
VREF to 10V -2.7-1.0mV/V ?VREF 10V to 36V 2 -2-0.40.3 ?VK
IREF2 0.7 4 μA
Over Temp. 2 0.4 1.2 ?IREF μA
IK(MIN)1 0.4 1 mA
0.04 500 nAIK(OFF)VREF = 0V, 3
VKA = 36V
ZKA F<1khz =IK1-150mA 1 0.15 0.5 ?
Reference Voltage ?VREF with Temp.?
Ratio of Change in VREF to Cathode Voltage
Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage
Dynamic Output Impedance
TC = Test Circuit
Calculating Average Temperature Coefficient (TC)
ppm%mV000?VREF (mV)?TA?VREFVREF at 25°C?TA?VREFVREF at 25°C?TATC in mV/°C =?ΤTC in %/°C =-1050000.5-20-55-250255075100125TC in ppm/°C =Temperature (°C)0.06 mV/°C0.002 %/°C24 ppm/°CTEST CIRCUITS
VINVKA = VREFVINVKAVINVKAIREFIKR1(VREF)R2IKIREFFigure 1a. Test Circuit 1Figure 1b. Test Circuit 2Figure 1c. Test Circuit 3Rev. 10/26/00
))?VREF))x 100x 106IK (OFF)TL431 TYPICAL PERFORMANCE CURVES
Low Current Operating Characteristics900800700600VKA = VREFTemperature Range: -0°C to 105°C1501251007550250-25-500-100-200-1.001.02.03.0-75-100-2-10123High Current Operating CharacteristicsVKA = VREFTemperature Range: -0°C to 105°CIK - Cathode Current (μA)500400300200100105°C25°C-0°CIK - Cathode Current (mA)VKA - Cathode Voltage (V)
VKA - Cathode Voltage (V)
Figure 2Off State Leakage1002.53Figure 3Reference Voltage vs. Ambient Temperature VKA = VREF IK = 10 mAVKA = 36VVREF = 0VIZ off - Off State Cathode Current (nA)102.52VREF - Reference Voltage (V)2.512.501VREF = 2.500V at 25°C2.492.480.12.472.460.01-60-3003060901202.45-60-300306090120TA - Ambient Temperature ( °C)
Figure 4TA - Ambient Temperature ( °C)
Figure 5Rev. 10/26/00
TL431
TYPICAL PERFORMANCE CURVES Reference Input Current3.0 R1 = 10 k?R2 = ∞
I = 10 mA2.5
2.0
1.5
1.0
0.5
0
-60-300306090 T - Ambient Temperature ( °C) Figure 6 Noise Voltage70
60
50
40
30
20
10V = V
I = 10 mA T = 25°C0 101001 k10 k f - Frequency (Hz)Figure 8
KReference Voltage Line Regulation0-10μA)IREF - Reference Input Current (VKA - Cathode Voltage (V)0 °C-2025 °C75 °C-30105 °C-40-50120036912151821242730A
VKA - Cathode Voltage (V)Figure 7Low Frequency Dynamic Output Impedance0.150VKA = VREFIKA = 1 to 100 mAf < 1 kHz0.125ZKA - Dynamic Impedance ( ? )Noise Voltage nV/√Hz0.1000.0750.0500.025KAREFKA0.0-60100 k-300306090120TA - Free Air TemperatureFigure 9
Rev. 10/26/00
MEMORY存储芯片TL431中文规格书 - 图文
