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LP2981x 100mA, Low-Dropout Regulator in SOT-23 Package
SLVS521I
July 2004 – February 2025
LP2981
,
LP2981A
PRODUCTION DATA
CONTENTS
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LP2981x 100mA, Low-Dropout Regulator in SOT-23 Package
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagrams
6.3
Feature Description
6.3.1
Output Enable
6.3.2
Dropout Voltage
6.3.3
Current Limit
6.3.3.1
Current Limit (Legacy Chip)
6.3.3.2
Current Limit (New Chip)
6.3.4
Undervoltage Lockout (UVLO)
6.3.5
Thermal Shutdown
6.3.6
Output Pulldown
6.4
Device Functional Modes
6.4.1
Normal Operation
6.4.2
Dropout Operation
6.4.3
Disabled
7
Application and Implementation
7.1
Application Information
7.1.1
Recommended Capacitor Types
7.1.1.1
Recommended Capacitors (Legacy Chip)
7.1.1.1.1
Tantalum Capacitors
7.1.1.1.2
Ceramic Capacitors
7.1.1.1.3
Aluminum Capacitors
7.1.1.2
Recommended Capacitors (New Chip)
7.1.2
Input and Output Capacitor Requirements
7.1.2.1
Input Capacitor
7.1.2.2
Output Capacitor
7.1.2.2.1
Output Capacitor (Legacy Chip)
7.1.2.2.2
Output Capacitor (New Chip)
7.1.3
Estimating Junction Temperature
7.1.4
Power Dissipation (PD)
7.1.5
Reverse Current
7.2
Typical Application
7.2.1
Design Requirements
7.2.2
Detailed Design Procedure
7.2.2.1
ON and OFF Input Operation
7.2.3
Application Curves
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
8
Device and Documentation Support
8.1
Device Nomenclature
8.2
Documentation Support
8.2.1
Related Documentation
8.3
Receiving Notification of Documentation Updates
8.4
Support Resources
8.5
Trademarks
8.6
Electrostatic Discharge Caution
8.7
Glossary
9
Revision History
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DBV|5
MPDS018T
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slvs521i_oa
slvs521i_pm
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LP2981x 100mA, Low-Dropout Regulator in SOT-23 Package