Product details

Vin (Min) (V) 6 Vin (Max) (V) 75 Vout (Min) (V) 0.8 Vout (Max) (V) 60 Iout (Max) (A) 30 Iq (Typ) (uA) 1500 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO Adjustable Regulated outputs (#) 1 Number of phases 1 Rating Catalog
Vin (Min) (V) 6 Vin (Max) (V) 75 Vout (Min) (V) 0.8 Vout (Max) (V) 60 Iout (Max) (A) 30 Iq (Typ) (uA) 1500 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO Adjustable Regulated outputs (#) 1 Number of phases 1 Rating Catalog
VQFN (RGY) 20 16 mm² 4.5 x 3.5
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 6 V to 75 V
    • 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
    • Optimized for CISPR 32 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
    • Low-side soft start for prebiased start-up
  • 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 LM5145 with WEBENCH Power Designer
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 6 V to 75 V
    • 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
    • Optimized for CISPR 32 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
    • Low-side soft start for prebiased start-up
  • 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 LM5145 with WEBENCH Power Designer

The LM5145 75-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 LM5145 continues to operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial control, robotic, datacom, and RF power 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 LM5145 75-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 LM5145 continues to operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial control, robotic, datacom, and RF power 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 LM5145 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B) PDF | HTML 19 Nov 2020
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Application note An Accurate Approach for Calculating the Efficiency of a Synchronous Buck Conver 02 Jul 2020
Application note Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) PDF | HTML 12 Jul 2019
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Application note IC Package Features Lead to Higher Reliability in Automotive Systems 20 Feb 2019
Application note Improving RF Power Amplifier Efficiency in 5G Radio Systems 05 Sep 2018
EVM User's guide LM5146-Q1EVM User's Guide 10 Aug 2018
Technical article A review of EMI standards, part 2 – radiated emissions 05 Jul 2018
Technical article A review of EMI standards, part 1 – conducted emissions 28 Jun 2018
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
Selection guide DC/DC Buck Controller Solutions Selection Guide 06 Feb 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Application note Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13 Nov 2017
Technical article How to design a simple two-phase current-sharing synchronous buck regulator using a voltage-mode controller 03 Nov 2017
Selection guide Control-Mode Quick Reference Guide (Rev. A) 14 Sep 2017
Technical article Synchronous buck controller solutions support wide VIN performance and flexibility 29 Jun 2017
EVM User's guide LM5145EVM-HD-20A High Density Evaluation Module (Rev. A) 07 Jun 2017
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
Application note Power Topology - Buck Converter 16 Aug 2010
Application note Load-Sharing TPS40050 Modules Using the UCC39002 Load-Share Controller 13 Apr 2004
Application note Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application 15 Feb 2001

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 (...)
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Simulation model

LM5145 PSpice Unencrypted Transient Model (Rev. C) LM5145 PSpice Unencrypted Transient Model (Rev. C)

Simulation tool

PSPICE-FOR-TI PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Calculation tool

LM5145DESIGN-CALC LM5145 synchronous buck controller design tool

Welcome to the LM5145 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 LM5145 75V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)
Calculation tool

LM5145 Inverting Buck-Boost Quickstart Calculator LM5145 Inverting Buck-Boost Quickstart Calculator

PCB layout

LM5146-Q1-EVM12V PCB Layout Files LM5146-Q1-EVM12V PCB Layout Files

PCB layout

LM5145EVM-HD-20A PCB Layout Files LM5145EVM-HD-20A PCB Layout Files

Reference designs

PMP20178 — 57W Output Synchronous Buck Converter for Telecom Reference Design

PMP20178 is a voltage-mode synchronous buck converter reference design rated for 5.2V output at 11A from an input voltage of 15V to 60V. This design uses the LM5145 synchronous buck controller at a switching frequency of 200 kHz. Features include power good, synchronization and trim functions.
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VQFN (RGY) 20 View options

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