SNVSC77
December 2024
LM5125-Q1
ADVANCE INFORMATION
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
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
Switching Frequency and Synchronization (SYNCIN)
6.3.3
Dual Random Spread Spectrum (DRSS)
6.3.4
Operation Modes (BYPASS, DEM, FPWM)
6.3.5
Dual- and Multi-phase Operation
6.3.6
BIAS (BIAS-pin)
6.3.7
Soft Start (SS-pin)
6.3.8
VOUT Programming (VOUT, ATRK, DTRK)
6.3.9
Protections
6.3.10
VOUT Overvoltage Protection (OVP)
6.3.11
Thermal Shutdown (TSD)
6.3.12
Power-Good Indicator (PGOOD-pin)
6.3.13
Current Sensing, Peak Current Limit, and Slope Compensation (CSP1, CSP2, CSN1, CSN2)
6.3.14
Current Sense Programming (CSP1, CSP2, CSN1, CSN2)
6.3.15
Input Current Limit and Monitoring (ILIM, IMON, DLY)
6.3.16
Signal Deglitch Overview
6.3.17
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
7.2
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 and Additional Parallel Schottky Diode
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
Application Curves
7.2.4.1
Efficiency
7.2.4.2
Steady State Waveforms
7.2.4.3
Step Load Response
7.2.4.4
Sync Operation
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
10.1
Tape and Reel Information
85
Package Options
Mechanical Data (Package|Pins)
RHB|32
MPQF130D
Thermal pad, mechanical data (Package|Pins)
6
Detailed Description