SNVSCC1
May 2022
LM5143A-Q1
PRODUCTION DATA
1
Features
2
Applications
3
Description
4
Revision History
5
Description (continued)
6
Device Comparison Table
7
Pin Configuration and Functions
7.1
Wettable Flanks
8
Specifications
8.1
Absolute Maximum Ratings
8.2
ESD Ratings
8.3
Recommended Operating Conditions
8.4
Thermal Information
8.5
Electrical Characteristics
8.6
Switching Characteristics
8.7
Typical Characteristics
9
Detailed Description
9.1
Overview
9.2
Functional Block Diagram
9.3
Feature Description
9.3.1
Input Voltage Range (VIN)
9.3.2
High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
9.3.3
Enable (EN1, EN2)
9.3.4
Power-Good Monitor (PG1, PG2)
9.3.5
Switching Frequency (RT)
9.3.6
Clock Synchronization (DEMB)
9.3.7
Synchronization Out (SYNCOUT)
9.3.8
Spread Spectrum Frequency Modulation (DITH)
9.3.9
Configurable Soft Start (SS1, SS2)
9.3.10
Output Voltage Setpoint (FB1, FB2)
9.3.11
Minimum Controllable On Time
9.3.12
Error Amplifier and PWM Comparator (FB1, FB2, COMP1, COMP2)
9.3.13
Slope Compensation
9.3.14
Inductor Current Sense (CS1, VOUT1, CS2, VOUT2)
9.3.14.1
Shunt Current Sensing
9.3.14.2
Inductor DCR Current Sensing
9.3.15
Hiccup Mode Current Limiting (RES)
9.3.16
High-Side and Low-Side Gate Drivers (HO1, HO2, LO1, LO2, HOL1, HOL2, LOL1, and LOL2)
9.3.17
Output Configurations (MODE, FB2)
9.3.17.1
Independent Dual-Output Operation
9.3.17.2
Single-Output Interleaved Operation
9.3.17.3
Single-Output Multiphase Operation
9.4
Device Functional Modes
9.4.1
Standby Modes
9.4.2
Diode Emulation Mode
9.4.3
Thermal Shutdown
10
Application and Implementation
10.1
Application Information
10.1.1
Power Train Components
10.1.1.1
Buck Inductor
10.1.1.2
Output Capacitors
10.1.1.3
Input Capacitors
10.1.1.4
Power MOSFETs
10.1.1.5
EMI Filter
10.1.2
Error Amplifier and Compensation
10.2
Typical Applications
10.2.1
Design 1 – 5-V and 3.3-V Dual-Output Buck Regulator for Automotive Applications
10.2.1.1
Design Requirements
10.2.1.2
Detailed Design Procedure
10.2.1.2.1
Custom Design With WEBENCH® Tools
10.2.1.2.2
Custom Design With Excel Quickstart Tool
10.2.1.2.3
Inductor Calculation
10.2.1.2.4
Current-Sense Resistance
10.2.1.2.5
Output Capacitors
10.2.1.2.6
Input Capacitors
10.2.1.2.7
Compensation Components
10.2.1.3
Application Curves
10.2.2
Design 2 – Two-Phase, 15-A, 2.1-MHz Single-Output Buck Regulator for Automotive ADAS Applications
10.2.2.1
Design Requirements
10.2.2.2
Detailed Design Procedure
10.2.2.3
Application Curves
10.2.3
Design 3 – Two-Phase, 50-A, 300-kHz Single-Output Buck Regulator for High-Voltage Automotive Battery Applications
10.2.3.1
Design Requirements
10.2.3.2
Detailed Design Procedure
10.2.3.3
Application Curves
11
Power Supply Recommendations
12
Layout
12.1
Layout Guidelines
12.1.1
Power Stage Layout
12.1.2
Gate-Drive Layout
12.1.3
PWM Controller Layout
12.1.4
Thermal Design and Layout
12.1.5
Ground Plane Design
12.2
Layout Example
13
Device and Documentation Support
13.1
Device Support
13.1.1
Third-Party Products Disclaimer
13.1.2
Development Support
13.1.2.1
Custom Design With WEBENCH® Tools
13.2
Documentation Support
13.2.1
Related Documentation
13.2.1.1
PCB Layout Resources
13.2.1.2
Thermal Design Resources
13.3
Receiving Notification of Documentation Updates
13.4
Support Resources
13.5
Trademarks
13.6
Electrostatic Discharge Caution
13.7
Glossary
14
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RHA|40
MPQF135D
Thermal pad, mechanical data (Package|Pins)
RHA|40
QFND657
Orderable Information
snvscc1_oa
snvscc1_pm
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
Versatile synchronous buck DC/DC controller
Wide input voltage range of 3.5 V to
65 V
1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to
55 V
150°C maximum junction temperature
3.3-µA typical shutdown mode current
15-µA typical no-load standby current
Two interleaved synchronous buck channels
Dual channel or single-output
multiphase
65-ns t
ON(min)
for high V
IN
/V
OUT
ratio
60-ns t
OFF(min)
for low dropout
Inherent protection features for robust design
Hiccup mode overcurrent protection
Independent ENABLE and PGOOD functions
Adjustable output voltage soft start
VCC, VDDA, and gate-drive UVLO protection
Thermal shutdown protection with hysteresis
Optimized for
CISPR 25 class 5
EMI
requirements
Slew-rate controlled adaptive
gate drivers
Spread spectrum
reduces peak emissions
100-kHz to 2.2-MHz switching frequency
SYNC in and SYNC out capability
Selectable diode emulation or FPWM modes
VQFN-40 package with wettable flank pins
Create a custom design using the
LM5143A-Q1
with
WEBENCH®
Power Designer