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LM5146

ACTIVE

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

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Data sheet

LM5146

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 100 Vin (min) (V) 5.5 Vout (max) (V) 60 Vout (min) (V) 0.8 Control mode Voltage mode Features Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Enable, Enable/Shutdown, Frequency synchronization, Load Disconnect, Output discharge, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable, Voltage control mode, adjustable UVLO Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 1750 Duty cycle (max) (%) 99 Number of phases 1 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 100 Vin (min) (V) 5.5 Vout (max) (V) 60 Vout (min) (V) 0.8 Control mode Voltage mode Features Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Enable, Enable/Shutdown, Frequency synchronization, Load Disconnect, Output discharge, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable, Voltage control mode, adjustable UVLO Operating temperature range (°C) -40 to 150 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
  • 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 11 and CISPR 32 Class B EMI 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
  • Fast line and load transient response
    • Voltage-mode control with line feedforward
    • High gain-bandwidth error amplifier
  • 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 with WEBENCH Power Designer
  • 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 11 and CISPR 32 Class B EMI 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
  • Fast line and load transient response
    • Voltage-mode control with line feedforward
    • High gain-bandwidth error amplifier
  • 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 with WEBENCH Power Designer

The LM5146 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 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 industrial controls, robotics, datacom, and RF applications.

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 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 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 industrial controls, robotics, datacom, and RF applications.

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 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) PDF | HTML 23 Jun 2021
Application note Power Supply Designs for eBike That Meet the New GB42295 National Standard 10 Jul 2025
Application note Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02 Oct 2024
Functional safety information LM5146 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 23 Jun 2021
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
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

LM5145EVM-HD-20A — LM5145 Wide VIN Synchronous Buck Controller High Density Evaluation Module

The LM5145EVM-HD-20A high density evaluation module (EVM) is designed to showcase the performance of the LM5145 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 wide (...)
User guide: PDF
Not available on TI.com
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 PSpice Unencrypted Transient Model Package

SNVMC65.ZIP (301 KB) - PSpice Model
Download
Calculation tool

LM5146DESIGN-CALC — LM5146/-Q1 100V synchronous buck controller quickstart calculator

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 100V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM5146 — 100-V synchronous buck DC/DC controller with wide duty-cycle range
  • LM5146-Q1 — Automotive 100-V synchronous buck DC/DC controller with wide duty-cycle range
Hardware development
Evaluation board
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

TIDA-010089 — Two-quadrant, 15V, 8A, programmable linear DC power supply reference design

This reference design demonstrates a low-noise, efficient, bidirectional power supply that achieves less than ±0.02% full-scale (FS) current and voltage control accuracy. The design utilizes an analog feedback loop for precise current control and implements a voltage tracking circuit to minimize (...)
Design guide: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RGY) 20 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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Information included:
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Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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