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LM25574-Q1 42-V, 0.5-A Step-Down Switching Regulator
SNVSB19
December 2017
LM25574-Q1
PRODUCTION DATA.
CONTENTS
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LM25574-Q1 42-V, 0.5-A Step-Down Switching Regulator
1
Features
2
Applications
3
Description
4
Revision History
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
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
High Voltage Start-Up Regulator
7.4
Device Functional Modes
7.4.1
Shutdown and Stand-by Mode
7.4.2
Oscillator and Sync Capability
7.4.3
Error Amplifier and PWM Comparator
7.4.4
Ramp Generator
7.4.5
Maximum Duty Cycle and Input Drop-out Voltage
7.4.6
Current Limit
7.4.7
Soft-Start
7.4.8
Boost Pin
7.4.9
Thermal Protection
8
Application and Implementation
8.1
Application Information
8.1.1
External Components
8.1.2
R3 (RT)
8.1.3
L1
8.1.4
C3 (CRAMP)
8.1.5
C9
8.1.6
C1
8.1.7
C8
8.1.8
C7
8.1.9
C4
8.1.10
R5, R6
8.1.11
R1, R2, C2
8.1.12
R4, C5, C6
8.1.13
Bias Power Dissipation Reduction
8.2
Typical Application
8.2.1
Typical Schematic for High Frequency (1 MHz) Application
9
Layout
9.1
Layout Guidelines
9.1.1
PCB Layout and Thermal Considerations
9.2
Layout Example
10
Device and Documentation Support
10.1
Device Support
10.1.1
Developmental Support
10.1.1.1
Custom Design With WEBENCH® Tools
10.2
Receiving Notification of Documentation Updates
10.3
Community Resources
10.4
Trademarks
10.5
Electrostatic Discharge Caution
10.6
Glossary
11
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
PW|16
MPDS361A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsb19_oa
snvsb19_pm
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