SNVSAP9A
March 2017 – February 2018
LM25141-Q1
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Simplified Schematic
4
Revision History
5
Pin Configuration and Functions
Pin 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
Switching Characteristics
6.7
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
7.3.2
VCC Regulator
7.3.3
Oscillator
7.3.4
Synchronization
7.3.5
Frequency Dithering (Spread Spectrum)
7.3.6
Enable
7.3.7
Power Good
7.3.8
Output Voltage
7.3.8.1
Minimum Output Voltage Adjustment
7.3.9
Current Sense
7.3.10
DCR Current Sensing
7.3.11
Error Amplifier and PWM Comparator
7.3.12
Slope Compensation
7.3.13
Hiccup Mode Current Limiting
7.3.14
Standby Mode
7.3.15
Soft Start
7.3.16
Diode Emulation
7.3.17
High- and Low-Side Drivers
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
Custom Design With WEBENCH® Tools
8.2.2.2
Inductor Calculation
8.2.2.3
Current Sense Resistor
8.2.2.4
Output Capacitor
8.2.2.5
Input Filter
8.2.2.5.1
EMI Filter Design
8.2.2.5.2
MOSFET Selection
8.2.2.5.3
Driver Slew Rate Control
8.2.2.5.4
Frequency Dithering
8.2.2.6
Control Loop
8.2.2.6.1
Feedback Compensator
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.1.1
Layout Procedure
10.2
Layout Examples
11
Device and Documentation Support
11.1
Device Support
11.1.1
Development Support
11.1.1.1
Custom Design With WEBENCH® Tools
11.2
Documentation Support
11.2.1
Related Documentation
11.2.1.1
PCB Layout Resources
11.2.1.2
Thermal Design Resources
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
11.2.1.2
Thermal Design Resources
AN-2020 Thermal Design by Insight, Not Hindsight
AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Pad Packages
Semiconductor and IC Package Thermal Metrics
Thermal Design Made Simple with LM43603 and LM43602
PowerPAD™Thermally Enhanced Package
PowerPAD Made Easy
Using New Thermal Metrics