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LP2981-N 100-mA, Low-Dropout Regulator in SOT-23 Package
SNOS773O
March 2000 – December 2023
LP2981-N
PRODUCTION DATA
CONTENTS
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LP2981-N 100-mA, 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 Diagram
6.3
Feature Description
6.3.1
Output Enable
6.3.2
Dropout Voltage
6.3.3
Current Limit
6.3.4
Undervoltage Lockout (UVLO)
6.3.5
Thermal Shutdown
6.3.6
Output Pulldown
6.4
Device Functional Modes
6.4.1
Device Functional Mode Comparison
6.4.2
Normal Operation
6.4.3
Dropout Operation
6.4.4
Disabled
7
Application and Implementation
7.1
Application Information
7.1.1
Recommended Capacitor Types
7.1.1.1
Recommended Capacitors for the Legacy Chip
7.1.1.2
Recommended Capacitors for the New Chip
7.1.2
Input and Output Capacitor Requirements
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
8
Power Supply Recommendations
9
Layout
9.1
Layout Guidelines
9.2
Layout Example
10
Device and Documentation Support
10.1
Device Nomenclature
10.2
Third-Party Products Disclaimer
10.3
Receiving Notification of Documentation Updates
10.4
Related Documentation
10.5
Support Resources
10.6
Trademarks
10.7
Electrostatic Discharge Caution
10.8
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DBV|5
MPDS018T
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snos773o_oa
snos773o_pm
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Data Sheet
LP2981-N 100-mA, Low-Dropout Regulator in SOT-23 Package
1
Features
Input Voltage (V
IN
) Range:
Legacy chip: 2.1 V to 16 V
New chip: 2.5 V to 16 V
Output Voltage (V
OUT
) Range: 1.2 V to 5.0 V
Output Voltage (V
OUT
) Accuracy:
±0.75% for A-Grade legacy chip
±1.25% for standard-grade legacy chip
±0.5% for new chip (A grade and standard grade)
Output Voltage (V
OUT
) accuracy over load, and temperature: ±1% (new chip)
Output current: Up to 100 mA
Low I
Q
(new chip): 69 μA at I
LOAD
= 0 mA
Low I
Q
(new chip): 620 μA at I
LOAD
= 100 mA
Shutdown current over temperature:
< 1 μA (legacy chip)
≤ 1.75 μA (new chip)
Output current limiting and thermal protection
Stable with 2.2-µF ceramic capacitors (new chip)
High PSRR (new chip):
75 dB at 1 kHz, 45 dB at 1 MHz
Operating junction temperature: –40°C to +125°C
Package: 5-pin SOT-23 (DBV)
2
Applications
Electricity meters
Micro inverters
Server PSU (12-V output)
Residential breakers