TL431LI Regulator Datasheet

TL431LI Datasheet, PDF, Equivalent


Part Number

TL431LI

Description

Programmable Shunt Regulator

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TL431LI
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TL431LI
TL432LI
SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018
TL431LI / TL432LI Programmable Shunt Regulator with Optimized Reference Current
1 Features
1 Reference Voltage Tolerance at 25°C
– 0.5% (B Grade)
– 1% (A Grade)
• Minimum Typical Output Voltage: 2.495 V
• Adjustable Output Voltage: Vref to 36 V
• Operation From 40°C to +125°C (Q Temp)
• Maximum Temperature Drift
– 10 mV (C Temp)
– 17 mV (I Temp)
– 27 mV (Q Temp)
• 0.3-Ω Typical Output Impedance
• Sink-Current Capability
– Imin = 1 mA (max)
– IKA = 15 mA (max)
• Reference Input Current IREF: 0.4 μA (max)
• Deviation of Reference Input Current over
Temperature, II(dev): 0.3 μA (max)
2 Applications
• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPS
• Zener Diode Replacement
• Voltage Monitoring
• Precision Constant Current Sink/Source
• Comparator with Integrated Reference
3 Description
The TL431LI device is a three-terminal adjustable
shunt regulator, with specified thermal stability over
applicable automotive, commercial, and military
temperature ranges. The output voltage can be set to
any value between Vref (approximately 2.495 V) and
36 V, with two external resistors. These devices have
a typical output impedance of 0.3 Ω. Active output
circuitry provides a very sharp turn-on characteristic,
making these devices excellent replacements for
Zener diodes in many applications, such as onboard
regulation, adjustable power supplies, and switching
power supplies. This device is a pin-to-pin alternative
to the industry standard TL431, with optimized Iref and
IIdev performance. The lower Iref and IIdev values
enable designers to achieve higher system accuracy
and lower leakage current. The TL432LI device has
exactly the same functionality and electrical
specifications as the TL431LI device, but has a
different pinout for the DBZ package.
The TL431LI device is offered in two grades, with
initial tolerances (at 25°C) of 0.5% and 1%, for the B
and A grade, respectively. In addition, low output drift
versus temperature ensures good stability over the
entire temperature range.
The TL43xLIxQ devices are characterized for
operation from –40°C to 125°C.
Device Information(1)
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
TL43xLI
SOT-23 (3)
2.90 mm x 1.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
Input
VKA
IKA
Vref
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

TL431LI
TL431LI
TL432LI
SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Thermal Information .................................................. 4
7.4 Recommended Operating Conditions....................... 4
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 6
8 Parameter Measurement Information .................. 9
8.1 Temperature Coefficient............................................ 9
8.2 Dynamic Impedance ............................................... 10
9 Detailed Description ............................................ 11
9.1 Overview ................................................................. 11
9.2 Functional Block Diagram ....................................... 11
9.3 Feature Description................................................. 12
9.4 Device Functional Modes........................................ 12
10 Applications and Implementation...................... 13
10.1 Application Information.......................................... 13
10.2 Typical Applications .............................................. 13
10.3 System Examples ................................................. 21
11 Power Supply Recommendations ..................... 24
12 Layout................................................................... 24
12.1 Layout Guidelines ................................................. 24
12.2 Layout Example .................................................... 25
13 Device and Documentation Support ................. 26
13.1 Related Links ........................................................ 26
13.2 Documentation Support ........................................ 26
13.3 Receiving Notification of Documentation Updates 26
13.4 Community Resources.......................................... 26
13.5 Trademarks ........................................................... 27
13.6 Electrostatic Discharge Caution ............................ 27
13.7 Glossary ................................................................ 27
14 Mechanical, Packaging, and Orderable
Information ........................................................... 27
4 Revision History
Changes from Original (July 2018) to Revision A
Page
• Changed TL43xLI status from Advance Information to Production Data release ................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: TL431LI TL432LI
Copyright © 2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TL431LI TL432LI SLVSDQ6A – JU LY 2018 – REVISED NOVEMBER 2018 TL431 LI / TL432LI Programmable Shunt Regulat or with Optimized Reference Current 1 Features •1 Reference Voltage Toleran ce at 25°C – 0.5% (B Grade) – 1% ( A Grade) • Minimum Typical Output Vol tage: 2.495 V • Adjustable Output Vol tage: Vref to 36 V • Operation From 40°C to +125°C (Q Temp) • Maximum Temperature Drift – 10 mV (C Temp) 17 mV (I Temp) – 27 mV (Q Temp) 0.3-Ω Typical Output Impedance • S ink-Current Capability – Imin = 1 mA (max) – IKA = 15 mA (max) • Referen ce Input Current IREF: 0.4 μA (max) Deviation of Reference Input Current over Temperature, II(dev): 0.3 μA (max ) 2 Applications • Adjustable Voltage and Current Referencing • Secondary Side Regulation in Flyback SMPS • Zen er Diode Replacement • Voltage Monito ring • Precision Constant Current Sink/Source • Comparator with Integrated Reference 3 Description The TL431LI dev.
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