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LMR544xx SIMPLE SWITCHER Power Converter 4V to 45V, 0.6A/1A Buck Converter in a SOT-23 Package
SLUSEG8D
October 2021 – April 2024
LMR54406
,
LMR54410
PRODUCTION DATA
CONTENTS
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LMR544xx SIMPLE SWITCHER Power Converter 4V to 45V, 0.6A/1A Buck Converter in a SOT-23 Package
1
1
Features
2
Applications
3
Description
4
Device Comparison Table
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
System Characteristics
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Fixed Frequency Peak Current Mode Control
7.3.2
Adjustable Output Voltage
7.3.3
Enable
7.3.4
Minimum ON Time, Minimum OFF Time, and Frequency Foldback
7.3.5
Bootstrap Voltage
7.3.6
Overcurrent and Short Circuit Protection
7.3.7
Soft Start
7.3.8
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Active Mode
7.4.3
CCM Mode
7.4.4
Light Load Operation (PFM Version)
7.4.5
Light-Load Operation (FPWM Version)
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Output Voltage Set-Point
8.2.2.2
Switching Frequency
8.2.2.3
Inductor Selection
8.2.2.4
Output Capacitor Selection
8.2.2.5
Input Capacitor Selection
8.2.2.6
Bootstrap Capacitor
8.2.2.7
Undervoltage Lockout Set-Point
8.2.2.8
Replacing Non Sync Converter
8.2.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.1.1
Compact Layout for EMI Reduction
8.4.1.2
Feedback Resistors
8.4.2
Layout Example
9
Device and Documentation Support
9.1
Device Support
9.1.1
Third-Party Products Disclaimer
9.2
Documentation Support
9.2.1
Related Documentation
9.3
Receiving Notification of Documentation Updates
9.4
Support Resources
9.5
Trademarks
9.6
Electrostatic Discharge Caution
9.7
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DBV|6
MPDS026Q
Thermal pad, mechanical data (Package|Pins)
Orderable Information
sluseg8d_oa
sluseg8d_pm
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Data Sheet
LMR544xx
SIMPLE SWITCHER
Power Converter 4V to 45V,
0.6A/1A Buck Converter in a SOT-23 Package
1
Features
Functional Safety-Capable
Documentation available to aid functional safety system design
Configured for rugged industrial applications
4V to 36V input voltage range
Withstands up to 50V short V
IN
transient
0.6A/1A continuous output current
60ns minimum switching on time
1.1MHz fixed switching frequency
–40°C to 150°C junction temperature range
98% maximum duty cycle
Monotonic start-up with prebiased output
Short-circuit protection with hiccup mode
Precision enable
±1% tolerance voltage reference
Small design size and ease of use
Integrated synchronous rectification
Internal compensation for ease of use
SOT-23 package
Pin-to-pin compatible with the
LMR14010A
,
LMR50410
, and
TPS560430
Various options in pin-to-pin compatible package
PFM and forced PWM (FPWM) options