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LM25148-Q1 42V, Automotive, Synchronous, Buck DC/DC Controller With Ultra-Low IQ and Dual Random Spread Spectrum
SNVSC03B
June 2021 – February 2025
LM25148-Q1
PRODUCTION DATA
CONTENTS
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LM25148-Q1 42V, Automotive, Synchronous, Buck DC/DC Controller With Ultra-Low IQ and Dual Random Spread Spectrum
1
1
Features
2
Applications
3
Description
4
Description (continued)
5
Orderable Part Numbers
6
Pin Configuration and Functions
6.1
Wettable Flanks
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Input Voltage Range (VIN)
8.3.2
High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
8.3.3
Precision Enable (EN)
8.3.4
Power-Good Monitor (PG)
8.3.5
Switching Frequency (RT)
8.3.6
Dual Random Spread Spectrum (DRSS)
8.3.7
Soft Start
8.3.8
Output Voltage Setpoint (FB)
8.3.9
Minimum Controllable On Time
8.3.10
Error Amplifier and PWM Comparator (FB, EXTCOMP)
8.3.11
Slope Compensation
8.3.12
Inductor Current Sense (ISNS+, VOUT)
8.3.12.1
Shunt Current Sensing
8.3.12.2
Inductor DCR Current Sensing
8.3.13
Hiccup Mode Current Limiting
8.3.14
High-Side and Low-Side Gate Drivers (HO, LO)
8.3.15
Output Configurations (CNFG)
8.3.16
Single-Output Dual-Phase Operation
8.4
Device Functional Modes
8.4.1
Sleep Mode
8.4.2
Pulse Frequency Modulation and Synchronization (PFM/SYNC)
8.4.3
Thermal Shutdown
9
Application and Implementation
9.1
Application Information
9.1.1
Power Train Components
9.1.1.1
Buck Inductor
9.1.1.2
Output Capacitors
9.1.1.3
Input Capacitors
9.1.1.4
Power MOSFETs
9.1.1.5
EMI Filter
9.1.2
Error Amplifier and Compensation
9.2
Typical Applications
9.2.1
Design 1 – High Efficiency 2.1MHz Synchronous Buck Regulator
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.2.1
Custom Design with WEBENCH® Tools
9.2.1.2.2
Buck Inductor
9.2.1.2.3
Current-Sense Resistance
9.2.1.2.4
Output Capacitors
9.2.1.2.5
Input Capacitors
9.2.1.2.6
Frequency Set Resistor
9.2.1.2.7
Feedback Resistors
9.2.1.2.8
Compensation Components
9.2.1.3
Application Curves
9.2.2
Design 2 – High Efficiency 440-kHz Synchronous Buck Regulator
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.3
Application Curves
9.2.3
Design 3 – Dual-Phase 400-kHz 20-A Synchronous Buck Regulator
9.2.3.1
Design Requirements
9.2.3.2
Detailed Design Procedure
9.2.3.3
Application Curves
9.3
Power Supply Recommendations
9.4
Layout
9.4.1
Layout Guidelines
9.4.1.1
Power Stage Layout
9.4.1.2
Gate-Drive Layout
9.4.1.3
PWM Controller Layout
9.4.1.4
Thermal Design and Layout
9.4.1.5
Ground Plane Design
9.4.2
Layout Example
10
Device and Documentation Support
10.1
Device Support
10.1.1
Development Support
10.1.1.1
Custom Design with WEBENCH® Tools
10.2
Documentation Support
10.2.1
Related Documentation
10.2.1.1
PCB Layout Resources
10.2.1.2
Thermal Design Resources
10.3
Receiving Notification of Documentation Updates
10.4
Support Resources
10.5
Trademarks
10.6
Electrostatic Discharge Caution
10.7
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
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Data Sheet
LM25148-Q1
42V,
Automotive,
Synchronous, Buck DC/DC Controller With Ultra-Low I
Q
and Dual Random Spread Spectrum
1
Features
AEC-Q100 qualified for automotive applications:
Device temperature grade 1: –40°C to +125°C ambient operating temperature
Functional Safety-Capable
Documentation available to aid functional safety system design
Integrated EMI mitigation
Selectable dual random spread spectrum (DRSS) feature for
enhanced EMI performance
across low and high-frequency bands
Optimized for
CISPR 25 Class 5 requirements
Versatile synchronous buck DC/DC controller
Wide input voltage range of 3.5V to
42V
1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to
36V
150°C maximum junction temperature
Shutdown mode current of 2.3µA
No-load sleep current of 9.5µA
Internal soft-start ramp of 3ms
Stackable up to two phases
Internal bootstrap diode
Switching frequency from 100kHz to 2.2MHz
SYNC in and SYNC out capability
Inherent protection features for robust design
Internal hiccup mode overcurrent protection
ENABLE and PGOOD functions
VCC, VDDA, and gate-drive UVLO protection
Internal or external loop compensation
Thermal shutdown protection with hysteresis
Create a custom design using the
LM25148-Q1 with
WEBENCH®
Power Designer
2
Applications
Automotive electronic systems
Advanced Driver Assistance Systems (ADAS)
Infotainment and clusters
Body electronics