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LM5125-Q1, Wide-VIN, Dual-Phase, Automotive, Boost Controller With VOUT Tracking
SNVSC77B
December 2024 – April 2025
LM5125-Q1
PRODUCTION DATA
CONTENTS
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LM5125-Q1, Wide-VIN, Dual-Phase, Automotive, Boost Controller With VOUT Tracking
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
Timing Requirements
5.7
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Device Configuration (CFG0-pin, CFG1-pin, CFG2-pin)
6.3.2
Device and Phase Enable/Disable (UVLO/EN, EN2)
6.3.3
Switching Frequency and Synchronization (SYNCIN)
6.3.4
Dual Random Spread Spectrum (DRSS)
6.3.5
Operation Modes (BYPASS, DEM, FPWM)
6.3.6
VCC Regulator, BIAS (BIAS-pin, VCC-pin)
6.3.7
Soft Start (SS-pin)
6.3.8
VOUT Programming (VOUT, ATRK, DTRK)
6.3.9
Protections
6.3.9.1
VOUT Overvoltage Protection (OVP)
6.3.9.2
Thermal Shutdown (TSD)
6.3.10
Power-Good Indicator (PGOOD-pin)
6.3.11
Slope Compensation (CSP1, CSP2, CSN1, CSN2)
6.3.12
Current Sense Setting and Switch Peak Current Limit (CSP1, CSP2, CSN1, CSN2)
6.3.13
Input Current Limit and Monitoring (ILIM, IMON, DLY)
6.3.14
Maximum Duty Cycle and Minimum Controllable On-time Limits
6.3.15
Signal Deglitch Overview
6.3.16
MOSFET Drivers, Integrated Boot Diode, and Hiccup Mode Fault Protection (LOx, HOx, HBx-pin)
6.4
Device Functional Modes
6.4.1
Shutdown State
7
Application and Implementation
7.1
Application Information
7.1.1
Feedback Compensation
7.1.2
Non-synchronous Application
7.2
Typical Application
7.2.1
Application
7.2.2
Design Requirements
7.2.3
Detailed Design Procedure
7.2.3.1
Determine the Total Phase Number
7.2.3.2
Determining the Duty Cycle
7.2.3.3
Timing Resistor RT
7.2.3.4
Inductor Selection Lm
7.2.3.5
Current Sense Resistor Rcs
7.2.3.6
Current Sense Filter RCSFP, RCSFN, CCS
7.2.3.7
Low-Side Power Switch QL
7.2.3.8
High-Side Power Switch QH
7.2.3.9
Snubber Components
7.2.3.10
Vout Programming
7.2.3.11
Input Current Limit (ILIM/IMON)
7.2.3.12
UVLO Divider
7.2.3.13
Soft Start
7.2.3.14
CFG Settings
7.2.3.15
Output Capacitor Cout
7.2.3.16
Input Capacitor Cin
7.2.3.17
Bootstrap Capacitor
7.2.3.18
VCC Capacitor CVCC
7.2.3.19
BIAS Capacitor
7.2.3.20
VOUT Capacitor
7.2.3.21
Loop Compensation
7.2.4
Performance Data and Results
7.2.4.1
Efficiency
7.2.4.2
Steady State Waveforms
7.2.4.3
Step Load Response
7.2.4.4
AC Loop Response Curve
7.2.4.5
Thermal Performance
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
Documentation Support
8.1.1
Related Documentation
8.2
Receiving Notification of Documentation Updates
8.3
Support Resources
8.4
Trademarks
8.5
Electrostatic Discharge Caution
8.6
Glossary
9
Revision History
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RHB|32
MPQF130D
Thermal pad, mechanical data (Package|Pins)
Orderable Information
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Data Sheet
LM5125-Q1, Wide-VIN, Dual-Phase, Automotive, Boost Controller With V
OUT
Tracking