TL431-Q1 Regulator Datasheet

TL431-Q1 Datasheet, PDF, Equivalent


Part Number

TL431-Q1

Description

Adjustable Precision Shunt Regulator

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TL431-Q1
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TL431-Q1, TL432-Q1
SGLS302F – MARCH 2005 – REVISED JULY 2019
TL431-Q1 / TL432-Q1 Adjustable Precision Shunt Regulator
1 Features
1 Qualified for automotive applications
• AEC-Q100 test guidance with the following:
– Device temperature grade 1: –40°C to 125°C
ambient operating temperature range
• Reference voltage tolerance at 25°C:
– 1% (A Grade)
– 0.5% (B Grade)
• Typical temperature drift:
– 14 mV (Q Temp)
• Low output noise
• 0.2-Ω Typical output impedance
• Sink-current capability: 1 mA to 100 mA
• Adjustable output voltage: VREF to 36 V
2 Applications
• Adjustable voltage and current referencing
• Secondary side regulation in flyback SMPSs
• Zener replacement
• Voltage monitoring
• Comparator with integrated reference
3 Description
The TL431LI-Q1 / TL432LI-Q1 are pin-to-pin
alternatives to TL431-Q1 / TL432-Q1. TL43xLI-Q1
offers better stability, lower temperature drift
(VI(dev)), and lower reference current (Iref) for
improved system accuracy.
The TL431-Q1 is a three-pin adjustable shunt
regulator with specified thermal stability over
applicable automotive temperature ranges. The
output voltage can be set to any value from VREF
(approximately 2.5 V) to 36 V, with two external
resistors (see Figure 28). This device has a typical
output impedance of 0.2 Ω. Active output circuitry
provides a sharp turnon characteristic, making this
device an excellent replacement for Zener diodes in
many applications, such as onboard regulation,
adjustable power supplies, and switching power
supplies.
The TL432-Q1 has exactly the same functionality and
electrical specifications as the TL431-Q1 device, but
has a different pinout for the DBZ package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TL431A-Q1
SOT-23 (5)
2.90 mm × 1.60 mm
TL43x-Q1
SOT-23 (3)
2.92 mm × 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
Copyright © 2016, Texas Instruments Incorporated
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.

TL431-Q1
TL431-Q1, TL432-Q1
SGLS302F – MARCH 2005 – REVISED JULY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics: TL43x-Q1......................... 4
6.6 Electrical Characteristics: TL43xA-Q1 ...................... 5
6.7 Electrical Characteristics: TL43xB-Q1 ...................... 5
6.8 Typical Characteristics .............................................. 6
7 Parameter Measurement Information .................. 9
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 11
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 12
9 Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Applications ................................................ 13
10 Power Supply Recommendations ..................... 18
11 Layout................................................................... 18
11.1 Layout Guidelines ................................................. 18
11.2 Layout Example .................................................... 18
12 Device and Documentation Support ................. 19
12.1 Documentation Support ........................................ 19
12.2 Related Links ........................................................ 19
12.3 Receiving Notification of Documentation Updates 19
12.4 Community Resources.......................................... 19
12.5 Trademarks ........................................................... 19
12.6 Electrostatic Discharge Caution ............................ 19
12.7 Glossary ................................................................ 19
13 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (November 2016) to Revision F
Page
• The TL431LI-Q1 / TL432LI-Q1 are pin-to-pin alternatives to TL431-Q1 / TL432-Q1. TL43xLI-Q1 offers better
stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy. ..................... 1
• Merged the TL431-Q1 with the TL432-Q1 data sheet. .......................................................................................................... 1
Changes from Revision D (March 2013) to Revision E
Page
• Added Applications section, Device Information table, Pin Configuration and Functions section, Specifications
section, ESD Ratings table, Detailed Description section, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,
Packaging, and Orderable Information section ...................................................................................................................... 1
• Deleted Ordering Information table; see Package Option Addendum at the end of the data sheet ...................................... 1
• Added Thermal Information table ........................................................................................................................................... 4
• Changed RθJA values for 5-pin DBV (SOT-23) From: 206 To: 215 and for 3-pin DBZ (SOT-23) From: 206 To: 334.7......... 4
2 Submit Documentation Feedback
Copyright © 2005–2019, Texas Instruments Incorporated
Product Folder Links: TL431-Q1 TL432-Q1


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TL431-Q1, TL432-Q1 SGLS302F – MARCH 2005 – REVISED JULY 2019 TL431 -Q1 / TL432-Q1 Adjustable Precision Shu nt Regulator 1 Features •1 Qualified for automotive applications • AEC-Q1 00 test guidance with the following: Device temperature grade 1: –40°C to 125°C ambient operating temperature range • Reference voltage tolerance at 25°C: – 1% (A Grade) – 0.5% (B Grade) • Typical temperature drift: 14 mV (Q Temp) • Low output noise • 0.2-Ω Typical output impedance • Sink-current capability: 1 mA to 100 m A • Adjustable output voltage: VREF t o 36 V 2 Applications • Adjustable vo ltage and current referencing • Secon dary side regulation in flyback SMPSs Zener replacement • Voltage monito ring • Comparator with integrated ref erence 3 Description The TL431LI-Q1 / TL432LI-Q1 are pin-to-pin alternatives to TL431-Q1 / TL432-Q1. TL43xLI-Q1 offers better stability, lower temperature drift (VI(dev)), and lower re.
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