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LM5146-Q1

ACTIVE

Automotive 100-V synchronous buck DC/DC controller with wide duty-cycle range

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Data sheet

LM5146-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 5.5 Vin (max) (V) 100 Iout (max) (A) 30 Operating temperature range (°C) -40 to 150 Control mode Voltage mode Topology Buck Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 60 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 1750 Duty cycle (max) (%) 99 Number of phases 1 TI functional safety category Functional Safety-Capable
Vin (min) (V) 5.5 Vin (max) (V) 100 Iout (max) (A) 30 Operating temperature range (°C) -40 to 150 Control mode Voltage mode Topology Buck Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 60 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 1750 Duty cycle (max) (%) 99 Number of phases 1 TI functional safety category Functional Safety-Capable
VQFN (RGY) 20 15.75 mm² 4.5 x 3.5
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient temperature range
  • Functional Safety-Capable
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 5.5 V to 100 V
    • 150°C maximum junction temperature
    • 0.8-V reference with ±1% feedback accuracy
    • Adjustable output voltage from 0.8 V to 60 V
    • 40-ns tON(min) for high VIN / VOUT ratio
    • 140-ns tOFF(min) for low dropout
    • Lossless RDS(on) or shunt current sensing
    • Optimized for CISPR 25 Class 5 requirements
  • Switching frequency from 100 kHz to 1 MHz
    • SYNC In and SYNC Out capability
    • Selectable diode emulation or FPWM
  • 7.5-V gate drivers for standard VTH MOSFETs
    • 14-ns adaptive dead-time control
    • 2.3-A source and 3.5-A sink capability
  • Inherent protection features for robust design
    • Adjustable output voltage soft start
    • Hiccup-mode overcurrent protection
    • Input UVLO with hysteresis
    • VCC and gate-drive UVLO protection
    • Precision enable input and open-drain PGOOD indicator for sequencing and control
    • Thermal shutdown protection with hysteresis
  • 20-pin VQFN package with wettable flanks
  • Create a custom design using the LM5146-Q1 with WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient temperature range
  • Functional Safety-Capable
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 5.5 V to 100 V
    • 150°C maximum junction temperature
    • 0.8-V reference with ±1% feedback accuracy
    • Adjustable output voltage from 0.8 V to 60 V
    • 40-ns tON(min) for high VIN / VOUT ratio
    • 140-ns tOFF(min) for low dropout
    • Lossless RDS(on) or shunt current sensing
    • Optimized for CISPR 25 Class 5 requirements
  • Switching frequency from 100 kHz to 1 MHz
    • SYNC In and SYNC Out capability
    • Selectable diode emulation or FPWM
  • 7.5-V gate drivers for standard VTH MOSFETs
    • 14-ns adaptive dead-time control
    • 2.3-A source and 3.5-A sink capability
  • Inherent protection features for robust design
    • Adjustable output voltage soft start
    • Hiccup-mode overcurrent protection
    • Input UVLO with hysteresis
    • VCC and gate-drive UVLO protection
    • Precision enable input and open-drain PGOOD indicator for sequencing and control
    • Thermal shutdown protection with hysteresis
  • 20-pin VQFN package with wettable flanks
  • Create a custom design using the LM5146-Q1 with WEBENCH Power Designer

The LM5146-Q1 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU) and HEV/EV systems.

Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications

The LM5146-Q1 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU) and HEV/EV systems.

Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications
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Technical documentation

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Type Title Date
* Data sheet LM5146-Q1 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B) PDF | HTML 02 Jun 2021
Application note Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02 Oct 2024
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Functional safety information LM5146-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution (Rev. A) 12 Jun 2020
Technical article How to meet European Commission ADAS requirements with TI DC/DC converters PDF | HTML 09 May 2019
Application brief IC Package Features Lead to Higher Reliability in Automotive Systems 20 Feb 2019
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 05 Sep 2018
EVM User's guide LM5146-Q1EVM User's Guide 10 Aug 2018
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13 Nov 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM5146-Q1-EVM12V — Synchronous buck controller evaluation module

The LM5146-Q1-EVM12V high density evaluation module (EVM) is designed to showcase the performance of the LM5146-Q1 high performance, synchronous buck DC-DC buck controller with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a (...)

User guide: PDF
Not available on TI.com
Simulation model

LM5146-Q1 PSpice Unencrypted Transient Model (Rev. A)

SNVMBL1A.ZIP (129 KB) - PSpice Model
Download
Calculation tool

LM5146DESIGN-CALC — LM5146-Q1 synchronous buck controller quickstart design tool

Welcome to the LM5146-Q1 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM5146-Q1 95-V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)
User guide: PDF
Download
Gerber file

LM5146-Q1 Synchronous Buck Controller Design Tool (Rev. A)

SNVC220A.ZIP (2577 KB)
Download
PCB layout

LM5146-Q1-EVM12V PCB Layout Files

SNVR473.ZIP (7838 KB)
Download
PCB layout

LM5145EVM-HD-20A PCB Layout Files

SNVR500.ZIP (1493 KB)
Download
Reference designs

PMP30916 — -8V Inverting Buck-boost Reference Design

This inverting buck-boost reference design uses LM5146-Q1 to generate -8 V out of telecom input +9 V to +56 V. By topology, the controller is negative referenced so a level shifter has been added to provide ENABLE function. Switching frequency of 400 kHz is a trade-off between switching losses and (...)
Test report: PDF
Reference designs

PMP30600-TH — 20-A automotive pre-regulator reference design with extended input voltage range for trucks

This reference design is a 100-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 100 kHz to ensure low noise operation. This IC (LM5146-Q1)  is designed for automotive with the ability to handle load dump for truck applications. A (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP30600-TL — 10-A automotive pre-regulator reference design with extended input voltage range for trucks

This reference design is a 50-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 250 kHz to ensure low noise operation. This IC (LM5146-Q1) is designed for automotive with the ability to handle load dump for truck applications.  A (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP30600-AL — 10-A automotive pre-regulator reference design

This reference design is a 50-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 400 kHz to ensure low noise operation. A resistor-capacitor (RC) snubber attenuates noise in the RF band to reduce radiated emissions. To reduce system EMI, (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP30600-AH — 20-A automotive pre-regulator reference design

This reference design is a 100-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 250 kHz to ensure low noise operation. A resistor-capacitor (RC) snubber attenuates noise in the RF band to reduce radiated emissions. To reduce system EMI, (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RGY) 20 Ultra Librarian
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