ATL431 Regulator Datasheet

ATL431 Datasheet, PDF, Equivalent


Part Number

ATL431

Description

2.5-V Low Iq Adjustable Precision Shunt Regulator

Manufacture

etcTI

Total Page 28 Pages
Datasheet
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ATL431
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ATL431, ATL432
SLVSCV5D – MARCH 2015 – REVISED OCTOBER 2016
ATL431, ATL432 2.5-V Low Iq Adjustable Precision Shunt Regulator
1 Features
1 Adjustable Regulated Output of 2.5 V to 36 V
• Very-Low Operating Current
– IKA(min) = 35 µA (Max)
– IREF = 150 nA (Max)
• Internally Compensated for Stability
– Stable With No Capacitive Load
• Reference Voltage Tolerances at 25°C
– 0.5% for B Grade
– 1% for A Grade
• Typical Temperature Drift
– 5 mV (–40°C to +85°C); I Version
– 6 mV (–40°C to +125°C); Q Version
• Extended Cathode Current Range
35 µA to 100 mA
• Low Output Impedance of 0.3 Ω (Max)
2 Applications
• Secondary Side Regulation in Flyback SMPSs
• Industrial, Computing, Consumer, and Portables
• Adjustable Voltage and Current Referencing
• Power Management
• Power Isolation
• Zener Replacement
3 Description
The ATL431 and ATL432 are three-terminal
adjustable shunt regulators, with specified thermal
stability over applicable automotive, commercial, and
industrial temperature ranges. The output voltage can
be set to any value between Vref (approximately
2.5 V) and 36 V, with two external resistors. These
devices have a typical output impedance of 0.05 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.
The ATL43x has > 20x improvement cathode current
range over it's TL43x predecessor. It also is stable
with a wider range of load capacitance types and
values.
ATL431 and ATL432 are the exact same parts but
with different pinouts and order numbers. The
ATL43x is offered in two grades, with initial
tolerances (at 25°C) of 0.5%, 1%, for the B and A
grade, respectively. In addition, low output drift vs
temperature ensures consistent voltage regulation
over the entire temperature range.
The ATL43xxI devices are characterized for operation
from –40°C to +85°C, and the ATL43xxQ devices are
characterized for operation from –40°C to +125°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ATL431
ATL432
SOT (3)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
Input
VKA
IKA
Stability Region for VKA = 15.0 V
2000
1000
Vref STABLE
100
20
0.0001
0.001
0.01
0.1
1
10
CKA(PF)
D001
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.

ATL431
ATL431, ATL432
SLVSCV5D – MARCH 2015 – REVISED OCTOBER 2016
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......................................................... 3
6.1 Absolute Maximum Ratings ..................................... 3
6.2 ESD Ratings.............................................................. 3
6.3 Recommended Operating Conditions....................... 3
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics, ATL431Ax, ATL432Ax ..... 4
6.6 Electrical Characteristics, ATL431Bx, ATL432Bx ..... 4
6.7 Typical Characteristics .............................................. 5
7 Parameter Measurement Information .................. 9
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 11
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 12
9 Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Applications ................................................ 14
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 Related Links ........................................................ 19
12.2 Receiving Notification of Documentation Updates 19
12.3 Community Resources.......................................... 19
12.4 Trademarks ........................................................... 19
12.5 Electrostatic Discharge Caution ............................ 19
12.6 Glossary ................................................................ 19
13 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (September 2015) to Revision D
Page
• Changed Small-Signal Voltage Amplification vs Frequency with an updated graph to provide additional data .................... 6
• Changed Test Circuit for Phase and Gain Measurement with an updated schematic........................................................... 9
• Updated Comparator Mode specifications in Design Parameters........................................................................................ 14
• Added Receiving Notification of Documentation Updates section ....................................................................................... 19
Changes from Revision B (May 2015) to Revision C
Page
• Changed ATL432xx status from PREVIEW to PRODUCTION. ............................................................................................. 1
Changes from Revision A (April 2015) to Revision B
Page
• Changed ATL431AQ, ATL431BI and ATL431BQ status from PREVIEW to PRODUCTION. ............................................... 1
• Changed flyback schematic to represent a more robust design ......................................................................................... 13
• Added flyback supply reliability recommendation................................................................................................................. 18
Changes from Original (March 2013) to Revision A
Page
• Initial release of full verison. ................................................................................................................................................... 1
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Copyright © 2015–2016, Texas Instruments Incorporated
Product Folder Links: ATL431 ATL432


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design ATL431, ATL43 2 SLVSCV5D – MARCH 2015 – REVISED O CTOBER 2016 ATL431, ATL432 2.5-V Low Iq Adjustable Precision Shunt Regulator 1 Features •1 Adjustable Regulated Ou tput of 2.5 V to 36 V • Very-Low Oper ating Current – IKA(min) = 35 µA (Ma x) – IREF = 150 nA (Max) • Internal ly Compensated for Stability – Stable With No Capacitive Load • Reference Voltage Tolerances at 25°C – 0.5% fo r B Grade – 1% for A Grade • Typica l Temperature Drift – 5 mV (–40°C to +85°C); I Version – 6 mV (–40° C to +125°C); Q Version • Extended C athode Current Range 35 µA to 100 mA Low Output Impedance of 0.3 Ω (Max) 2 Applications • Secondary Side Regu lation in Flyback SMPSs • Industrial, Computing, Consumer, and Portables • Adjustable Voltage and Current Referen cing • Power Management • Power Iso lation • Zener Replacement 3 Description The ATL431 and ATL432 are three-terminal adjustable shunt regulators, with .
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