Datasheet ATL432LI (Texas Instruments)

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ATL431LI ATL432LI
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
ATL431LI / ATL432LI High Bandwidth Low-Iq Programmable Shunt Regulator 1 Features 3 Description
• Reference voltage tolerance at 25°C The ATL43xLI device is a three-terminal adjustable 1 shunt regulator, with specified thermal stability over – 0.5% (B Grade) applicable automotive, commercial, and military – 1% (A Grade) temperature ranges. The output voltage can be set to • Minimum typical output voltage: 2.5 V any value between Vref (approximately 2.5 V) and 36 V, with two external resistors. These devices have a • Adjustable output voltage: Vref to 36 V typical output impedance of 0.3 Ω. Active output • Operation from −40°C to +125°C (Q temp) circuitry provides a very sharp turn-on characteristic, • Maximum temperature drift making these devices excellent replacements for – 17 mV (I Temp) Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching – 27 mV (Q Temp) power supplies. This device is a pin-to-pin alternative • 0.3-Ω Typical output impedance to the TL431LI and TL432LI, with lower minimum • Sink-current capability operating current to help reduce system power consumption. The ATL432LI device has exactly the – Imin = 0.08 mA (max) same functionality and electrical specifications as the – IKA = 15 mA (max) ATL431LI device, but has a different pinout for the • Reference input current I DBZ package. The ATL431LI is also offered in a tiny REF: 0.4 μA (max) X2SON (1.00 mm x 1.00 mm) package which makes • Deviation of reference input current over it ideal for space constraint applications. temperature, II(dev): 0.3 μA (max) • Packages: 1-mm x 1-mm X2SON or SOT23-3 The ATL431LI device is offered in two grades, with initial tolerances (at 25°C) of 0.5%, and 1%, for the B
2 Applications
and A grade, respectively. In addition, low output drift versus temperature ensures good stability over the • Adjustable voltage and current referencing entire temperature range. • Secondary side regulation in Flyback SMPS The ATL43xLIxQ devices are characterized for • Zener diode replacement operation from –40°C to +125°C. • Voltage monitoring
Device Information(1)
• Precision constant current sink/source
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
• Comparator with integrated reference ATL43xLI SOT-23 (3) 2.90 mm x 1.30 mm ATL431LI X2SON (4) 1.00 mm x 1.00 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. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Device Comparison Table 6 Pin Configuration and Functions 7 Specifications 7.1 Absolute Maximum Ratings 7.2 ESD Ratings 7.3 Thermal Information 7.4 Recommended Operating Conditions 7.5 Electrical Characteristics 8 Typical Characteristics 9 Parameter Measurement Information 9.1 Temperature Coefficient 9.2 Dynamic Impedance 10 Detailed Description 10.1 Overview 10.2 Functional Block Diagram 10.3 Feature Description 10.4 Device Functional Modes 10.4.1 Open Loop (Comparator) 10.4.2 Closed Loop 11 Applications and Implementation 11.1 Application Information 11.2 Typical Applications 11.2.1 Comparator With Integrated Reference 11.2.1.1 Design Requirements 11.2.1.2 Detailed Design Procedure 11.2.1.3 Application Curve 11.2.2 Precision Constant Current Sink 11.2.2.1 Design Requirements 11.2.2.2 Detailed Design Procedure 11.2.3 Shunt Regulator/Reference 11.2.3.1 Design Requirements 11.2.3.2 Detailed Design Procedure 11.2.3.3 Application Curve 11.2.4 Isolated Flyback with Optocoupler 11.2.4.1 Design Requirements 11.3 System Examples 12 Power Supply Recommendations 13 Layout 13.1 Layout Guidelines 13.2 SOT23-3 Layout Example 13.3 X2SON (DQN) Layout Example 13.4 Thermal Considerations 14 Device and Documentation Support 14.1 Documentation Support 14.1.1 Device Nomenclature 14.1.2 Related Documentation 14.2 Related Links 14.3 Receiving Notification of Documentation Updates 14.4 Community Resources 14.5 Trademarks 14.6 Electrostatic Discharge Caution 14.7 Glossary 15 Mechanical, Packaging, and Orderable Information