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DC/DC 控制器

LM5145

現行

具有寬輸入電壓和工作週期範圍的 75V 同步降壓控制器

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產品規格表

LM5145

現行
產品規格表 立即訂購

產品詳細資料

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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技術文件

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM5145 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B) PDF | HTML 2020/11/19
應用說明 Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 2024/10/2
類比設計期刊 Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 2023/8/29
電子書 An Engineer’s Guide to Low EMI in DC/DC Regulators 2021/4/21
應用說明 An Accurate Approach for Calculating the Efficiency of a Synchronous Buck Conver 2020/7/2
應用說明 Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) PDF | HTML 2019/7/12
白皮書 Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019/4/10
應用說明 Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019/3/12
Application brief IC Package Features Lead to Higher Reliability in Automotive Systems 2019/2/20
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 2018/9/5
技術文章 A review of EMI standards, part 2 – radiated emissions PDF | HTML 2018/7/5
技術文章 A review of EMI standards, part 1 – conducted emissions PDF | HTML 2018/6/28
白皮書 An overview of radiated EMI specifications for power supplies 2018/6/5
選擇指南 DC/DC Buck Controller Solutions Selection Guide 2018/2/6
白皮書 An overview of conducted EMI specifications for power supplies 2018/2/1
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 2017/11/13
技術文章 How to design a simple two-phase current-sharing synchronous buck regulator using PDF | HTML 2017/11/3
技術文章 Synchronous buck controller solutions support wide VIN performance and flexibility PDF | HTML 2017/6/29
類比設計期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016/7/21
技術文章 High Density PCB Layout of DC/DC Converters, Part 2 PDF | HTML 2015/9/16
技術文章 High Density PCB Layout of DC/DC Converters, Part 1 PDF | HTML 2015/9/12
應用說明 Power Topology - Buck Converter 2010/8/16
應用說明 Load-Sharing TPS40050 Modules Using the UCC39002 Load-Share Controller 2004/4/13
應用說明 Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application 2001/2/15

設計與開發

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開發板

LM5145EVM-HD-20A — LM5145 寬輸入電壓同步降壓控制器高密度評估模組

LM5145EVM-HD-20A 高密度評估模組 (EVM) 可展示具有寬輸入電壓範圍的 LM5145 高性能同步降壓 DC-DC 降壓控制器的效能。該設計採用微型元件封裝，元件數量少。此評估模組可在 24V 至 72V 的廣泛輸入電壓範圍內運作，提供固定 5V 輸出，設定點準確度優於 1%，且最大輸出電流可達 20A。憑藉 LM5145 的 40ns 最小開啟時間，就能以極低工作週期進行運作。LM5145 提供全套防護功能，可確保穩壓器在發生故障時提供防護。其中包括欠電壓鎖定以在電壓暫降情況下確保正常運作、可編程緩啟動以減少突波電流、Hiccup (...)
使用指南: PDF
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模擬型號

LM5145 PSpice Unencrypted Transient Model (Rev. C)

SNVMB65C.ZIP (150 KB) - PSpice 模型
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計算工具

LM5145DESIGN-CALC — LM5145 快速入門計算機工具

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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計算工具

SNVR510 — LM5145 Inverting Buck-Boost Quickstart Calculator

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參考設計

PMP20178 — 適用於電信的 57W 輸出同步降壓轉換器參考設計

PMP20178 是一款電壓模式同步降壓轉換器參考設計，輸入電壓為 15V 至 60V，11A 時額定電壓為 5.2V 輸出。此設計使用 LM5145 同步降壓控制器，切換頻率為 200kHz。功能包括電源良好，同步和修整功能。
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VQFN (RGY) 20 Ultra Librarian
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