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LM5145

ACTIVO

Controlador reductor síncrono de 75 V con amplio rango de tensión de entrada y ciclo de trabajo

Detalles del producto

Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 75 Vin (min) (V) 6 Vout (max) (V) 60 Vout (min) (V) 0.8 Control mode Voltage mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Duty cycle (max) (%) 99 Iq (typ) (A) 0.0015 Number of phases 1 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 75 Vin (min) (V) 6 Vout (max) (V) 60 Vout (min) (V) 0.8 Control mode Voltage mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Duty cycle (max) (%) 99 Iq (typ) (A) 0.0015 Number of phases 1 Operating temperature range (°C) -40 to 125
VQFN (RGY) 20 15.75 mm² (4.5 mm × 3.5 mm)
  • 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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM5145 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B) PDF | HTML 19/11/2020
Nota sobre la aplicación Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 2/10/2024
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 29/08/2023
Libro electrónico An Engineer’s Guide to Low EMI in DC/DC Regulators 21/04/2021
Nota sobre la aplicación An Accurate Approach for Calculating the Efficiency of a Synchronous Buck Conver 2/07/2020
Nota sobre la aplicación Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) PDF | HTML 12/07/2019
Informe Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10/04/2019
Nota sobre la aplicación Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12/03/2019
Application brief IC Package Features Lead to Higher Reliability in Automotive Systems 20/02/2019
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 5/09/2018
Artículo técnico A review of EMI standards, part 2 – radiated emissions PDF | HTML 5/07/2018
Artículo técnico A review of EMI standards, part 1 – conducted emissions PDF | HTML 28/06/2018
Informe An overview of radiated EMI specifications for power supplies 5/06/2018
Guía de selección DC/DC Buck Controller Solutions Selection Guide 6/02/2018
Informe An overview of conducted EMI specifications for power supplies 1/02/2018
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13/11/2017
Artículo técnico How to design a simple two-phase current-sharing synchronous buck regulator using PDF | HTML 3/11/2017
Artículo técnico Synchronous buck controller solutions support wide VIN performance and flexibility PDF | HTML 29/06/2017
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21/07/2016
Artículo técnico High Density PCB Layout of DC/DC Converters, Part 2 PDF | HTML 16/09/2015
Artículo técnico High Density PCB Layout of DC/DC Converters, Part 1 PDF | HTML 12/09/2015
Nota sobre la aplicación Power Topology - Buck Converter 16/08/2010
Nota sobre la aplicación Load-Sharing TPS40050 Modules Using the UCC39002 Load-Share Controller 13/04/2004
Nota sobre la aplicación Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application 15/02/2001

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

LM5145EVM-HD-20A — Módulo de evaluación LM5145 de controlador reductor síncrono de VIN amplia y alta densidad

El módulo de evaluación (EVM) de alta densidad LM5145EVM-HD-20A está diseñado para mostrar el rendimiento del controlador buck CC-CC sincrónico LM5145 de alto rendimiento con un amplio rango de tensión de entrada. El diseño está empaquetado en un espacio reducido con un bajo número de componentes. (...)
Guía del usuario: PDF
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Modelo de simulación

LM5145 PSpice Unencrypted Transient Model (Rev. C)

SNVMB65C.ZIP (150 KB) - Modelo PSpice
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Herramienta de cálculo

LM5145DESIGN-CALC — Herramienta de cálculo de inicio rápido LM5145

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 (...)

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Herramienta de cálculo

SNVR510 — LM5145 Inverting Buck-Boost Quickstart Calculator

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Diseño de referencia

PMP20178 — Diseño de referencia de convertidor buck sincrónico de 57 W de salida para telecomunicaciones

PMP20178 es un diseño de referencia de convertidor buck sincrónico de modo de tensión clasificado para una salida de 5.2 V a 11 A a partir de una tensión de entrada de 15 V a 60 V. Este diseño utiliza el controlador buck sincrónico de LM5145 a una frecuencia de conmutación de 200 kHz. Las (...)
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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
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Pedidos y calidad

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