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AC/DC 和 DC/DC 控制器 (外部 FET)

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

Vin (min) (V) 6 Vin (max) (V) 75 Iout (max) (A) 30 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Topology Buck Rating Catalog 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) 1500 Duty cycle (max) (%) 99 Number of phases 1
Vin (min) (V) 6 Vin (max) (V) 75 Iout (max) (A) 30 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Topology Buck Rating Catalog 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) 1500 Duty cycle (max) (%) 99 Number of phases 1
VQFN (RGY) 20 15.75 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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類型 標題 日期
* Data sheet LM5145 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B) PDF | HTML 2020年 11月 19日
Application note Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 2024年 10月 2日
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 2023年 8月 29日
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 2021年 4月 21日
Application note An Accurate Approach for Calculating the Efficiency of a Synchronous Buck Conver 2020年 7月 2日
Application note Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) PDF | HTML 2019年 7月 12日
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019年 4月 10日
Application brief IC Package Features Lead to Higher Reliability in Automotive Systems 2019年 2月 20日
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 2018年 9月 5日
EVM User's guide LM5146-Q1EVM User's Guide 2018年 8月 10日
Technical article A review of EMI standards, part 2 – radiated emissions PDF | HTML 2018年 7月 5日
Technical article A review of EMI standards, part 1 – conducted emissions PDF | HTML 2018年 6月 28日
White paper An overview of radiated EMI specifications for power supplies 2018年 6月 5日
Selection guide DC/DC Buck Controller Solutions Selection Guide 2018年 2月 6日
White paper An overview of conducted EMI specifications for power supplies 2018年 2月 1日
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 2017年 11月 13日
Technical article How to design a simple two-phase current-sharing synchronous buck regulator using PDF | HTML 2017年 11月 3日
Technical article Synchronous buck controller solutions support wide VIN performance and flexibility PDF | HTML 2017年 6月 29日
EVM User's guide LM5145EVM-HD-20A High Density Evaluation Module (Rev. A) 2017年 6月 7日
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
Technical article High Density PCB Layout of DC/DC Converters, Part 2 PDF | HTML 2015年 9月 16日
Technical article High Density PCB Layout of DC/DC Converters, Part 1 PDF | HTML 2015年 9月 12日
Application note Power Topology - Buck Converter 2010年 8月 16日
Application note Load-Sharing TPS40050 Modules Using the UCC39002 Load-Share Controller 2004年 4月 13日
Application note Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application 2001年 2月 15日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

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

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 (...)
使用指南: PDF
TI.com 無法提供
模擬型號

LM5145 PSpice Unencrypted Transient Model (Rev. C)

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

LM5145DESIGN-CALC — LM5145 Quickstart 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 (...)

支援產品和硬體

支援產品和硬體

產品
AC/DC 和 DC/DC 控制器 (外部 FET)
LM5145 — 具有寬輸入電壓和工作週期範圍的 75V 同步降壓控制器 LM5145-Q1 — 具有寬占空比範圍的車用 75V 同步降壓 DC/DC 控制器
硬體開發
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
軟體
計算工具
LM5145DESIGN-CALC — LM5145 同步降壓控制器設計工具
下載
計算工具

SNVR510 — LM5145 Inverting Buck-Boost Quickstart Calculator

支援產品和硬體

支援產品和硬體

產品
AC/DC 和 DC/DC 控制器 (外部 FET)
LM5145 — 具有寬輸入電壓和工作週期範圍的 75V 同步降壓控制器
下載
PCB 佈局

LM5146-Q1-EVM12V PCB Layout Files

SNVR473.ZIP (7838 KB)
下載
PCB 佈局

LM5145EVM-HD-20A PCB Layout Files

SNVR500.ZIP (1493 KB)
下載
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 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.
Test report: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
VQFN (RGY) 20 Ultra Librarian
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