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TLV431B Datasheet Preview

TLV431B Datasheet

Low-Voltage Adjustable Precision Shunt Regulator

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TLV431, TLV431A, TLV431B
SLVS139X – JULY 1996 – REVISED MAY 2018
TLV431x Low-Voltage Adjustable Precision Shunt Regulator
1 Features
1 Low-Voltage Operation, VREF = 1.24 V
• Adjustable Output Voltage, VO = VREF to 6 V
• Reference Voltage Tolerances at 25°C
– 0.5% for TLV431B
– 1% for TLV431A
– 1.5% for TLV431
• Typical Temperature Drift
– 4 mV (0°C to 70°C)
– 6 mV (–40°C to 85°C)
– 11 mV (–40°C to 125°C)
• Low Operational Cathode Current, 80 µA Typical
• 0.25-Ω Typical Output Impedance
• Ultra-Small SC-70 Package Offers 40% Smaller
Footprint Than SOT-23-3
• See TLVH431 and TLVH432 for:
– Wider VKA (1.24 V to 18 V) and IK (80 mA)
– Additional SOT-89 Package
– Multiple Pinouts for SOT-23-3 and SOT-89
Packages
• On Products Compliant to MIL-PRF-38535,
All Parameters Are Tested Unless Otherwise
Noted. On All Other Products, Production
Processing Does Not Necessarily Include Testing
of All Parameters.
3 Description
The TLV431 device is a low-voltage 3-terminal
adjustable voltage reference with specified thermal
stability over applicable industrial and commercial
temperature ranges. Output voltage can be set to any
value between VREF (1.24 V) and 6 V with two
external resistors (see the Parameter Measurement
Information section). These devices operate from a
lower voltage (1.24 V) than the widely used TL431
and TL1431 shunt-regulator references.
When used with an optocoupler, the TLV431 device
is an ideal voltage reference in isolated feedback
circuits for 3-V to 3.3-V switching-mode power
supplies. These devices have a typical output
impedance of 0.25 Ω. Active output circuitry provides
a very sharp turnon characteristic, making them
excellent replacements for low-voltage Zener diodes
in many applications, including on-board regulation
and adjustable power supplies.
Device Information(1)
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
SOT-23 (3)
2.90 mm × 1.30 mm
SOT-23 (5)
2.90 mm × 1.60 mm
TLV431x
SC70 (6)
2.00 mm × 1.25 mm
TO-92 (3)
4.30 mm × 4.30 mm
SOIC (8)
4.90 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2 Applications
• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPSs
• Zener Replacement
• Voltage Monitoring
• Comparator With Integrated Reference
Simplified Schematic
Input
VO
IK
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.




etcTI

TLV431B Datasheet Preview

TLV431B Datasheet

Low-Voltage Adjustable Precision Shunt Regulator

No Preview Available !

TLV431, TLV431A, TLV431B
SLVS139X – JULY 1996 – REVISED MAY 2018
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 for TLV431........................ 5
6.6 Electrical Characteristics for TLV431A ..................... 6
6.7 Electrical Characteristics for TLV431B ..................... 7
6.8 Typical Characteristics .............................................. 8
7 Parameter Measurement Information ................ 16
8 Detailed Description ............................................ 17
8.1 Overview ................................................................. 17
8.2 Functional Block Diagram ....................................... 17
8.3 Feature Description................................................. 17
8.4 Device Functional Modes........................................ 18
9 Applications and Implementation ...................... 19
9.1 Application Information............................................ 19
9.2 Typical Applications ................................................ 20
10 Power Supply Recommendations ..................... 24
11 Layout................................................................... 24
11.1 Layout Guidelines ................................................. 24
11.2 Layout Example .................................................... 24
12 Device and Documentation Support ................. 25
12.1 Documentation Support ........................................ 25
12.2 Related Links ........................................................ 25
12.3 Receiving Notification of Documentation Updates 25
12.4 Community Resources.......................................... 25
12.5 Trademarks ........................................................... 25
12.6 Electrostatic Discharge Caution ............................ 25
12.7 Glossary ................................................................ 25
13 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
Changes from Revision W (March 2018) to Revision X
Page
• Changed figure 18 ............................................................................................................................................................... 14
Changes from Revision V (January 2015) to Revision W
Page
• Changed crossreference link in the Description section ....................................................................................................... 1
• Changed the Stability Boundary Conditions graph .............................................................................................................. 13
• Added the Phase Margin vs Capacitive Load VKA = VREF (1.25 V), TA= 25°C graph ........................................................... 14
• Added the Phase Margin vs Capacitive Load VKA = 2.50 V, TA= 25°C graph...................................................................... 14
• Added the Phase Margin vs Capacitive Load VKA = 5.00 V, TA= 25°C graph...................................................................... 15
• Added Documentation Support section ............................................................................................................................... 25
• Added Receiving Notification of Documentation Updates section ...................................................................................... 25
• Added Community Resources section ................................................................................................................................ 25
Changes from Revision U (January 2014) to Revision V
Page
• Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,
Packaging, and Orderable Information section. ..................................................................................................................... 1
Changes from Revision T (June 2007) to Revision U
Page
• Updated document to new TI data sheet format. ................................................................................................................... 1
• Deleted Ordering Information table. ....................................................................................................................................... 1
• Updated Features. .................................................................................................................................................................. 1
2 Submit Documentation Feedback
Copyright © 1996–2018, Texas Instruments Incorporated
Product Folder Links: TLV431 TLV431A TLV431B


Part Number TLV431B
Description Low-Voltage Adjustable Precision Shunt Regulator
Maker etcTI
Total Page 30 Pages
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