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LM25117

正在供货

具有跟踪功能的 4.5-42V 宽输入电压、电流模式同步降压控制器

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LM25149 正在供货 具有超低 IQ 和集成式有源 EMI 滤波器的 42V 同步降压直流/直流控制器 Active EMI filtering and DRSS reduces EMI by an average of 25 dBµV.

产品详情

Vin (min) (V) 4.5 Vin (max) (V) 42 Vout (min) (V) 0.8 Vout (max) (V) 41 Iout (max) (A) 20 Iq (typ) (mA) 4.8 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 750 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog Control mode current mode Type Controller
Vin (min) (V) 4.5 Vin (max) (V) 42 Vout (min) (V) 0.8 Vout (max) (V) 41 Iout (max) (A) 20 Iq (typ) (mA) 4.8 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 750 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog Control mode current mode Type Controller
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4 WQFN (RTW) 24 16 mm² 4 x 4

  • Emulated peak current mode control
  • Wide operating range from 4.5V to 42V
  • Robust 3.3A peak gate drives
  • Adaptive dead-time output driver control
  • Free-run or synchronizable clock up to 750kHz
  • Optional diode emulation mode
  • Programmable output from 0.8V
  • Precision 1.5% voltage reference
  • Analog current monitor
  • Programmable current limit
  • Hiccup mode over current protection
  • Programmable soft-start and tracking
  • Programmable line under-voltage lockout
  • Programmable switch-over to external bias supply
  • Thermal shutdown

  • Packages

  • TSSOP-20EP (Thermally enhanced)
  • LLP-24 (4mmx4mm)

  • Emulated peak current mode control
  • Wide operating range from 4.5V to 42V
  • Robust 3.3A peak gate drives
  • Adaptive dead-time output driver control
  • Free-run or synchronizable clock up to 750kHz
  • Optional diode emulation mode
  • Programmable output from 0.8V
  • Precision 1.5% voltage reference
  • Analog current monitor
  • Programmable current limit
  • Hiccup mode over current protection
  • Programmable soft-start and tracking
  • Programmable line under-voltage lockout
  • Programmable switch-over to external bias supply
  • Thermal shutdown

  • Packages

  • TSSOP-20EP (Thermally enhanced)
  • LLP-24 (4mmx4mm)

  • The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

    The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line under-voltage lockout.


    The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

    The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line under-voltage lockout.


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    技术文档

    star =有关此产品的 TI 精选热门文档
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    类型 标题 下载最新的英语版本 日期
    * 数据表 Wide Input Range Synchronous Buck Controller with Analog Current Monitor (cn) 数据表 (Rev. B) 最新英语版本 (Rev.F) PDF | HTML 2011年 9月 7日
    白皮书 Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019年 4月 10日
    选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
    白皮书 Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018年 7月 3日
    应用手册 How to Design a Simple Constant Current/Constant Voltage Buck Converter 2018年 6月 26日
    选择指南 电源管理指南 2018 (Rev. R) 2018年 6月 25日
    模拟设计期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
    模拟设计期刊 2015 年第 3 季度模拟应用期刊 英语版 2015年 9月 8日
    模拟设计期刊 在 DC/DC 转换器中采用陶瓷或电解输出电容器 - 为什么不能兼用呢? 英语版 2015年 9月 8日
    用户指南 AN-2065 LM5119 Evaluation Board (Rev. B) 2013年 4月 24日
    用户指南 AN-2103 LM5117 Evaluation Board (Rev. B) 2013年 4月 24日

    设计和开发

    如需其他信息或资源,请点击以下任一标题进入详情页面查看(如有)。

    评估板

    LM25117EVAL — LM25117 评估板

    The LM25117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM25117 controller IC. The evaluation board provides 3.3V output with a 9A current capability in addition with average output current (...)

    用户指南: PDF
    TI.com 上无现货
    仿真模型

    LM25117 PSpice Average Model

    SNVM385.ZIP (51 KB) - PSpice Model
    仿真模型

    LM25117 PSpice Transient Model (Rev. A)

    SNVM386A.ZIP (167 KB) - PSpice Model
    仿真模型

    LM25117 TINA-TI Average Reference Design (Rev. A)

    SNVM488A.TSC (148 KB) - TINA-TI Reference Design
    仿真模型

    LM25117 TINA-TI Average Spice Model (Rev. A)

    SNVM489A.ZIP (8 KB) - TINA-TI Spice Model
    仿真模型

    LM25117 TINA-TI Transient Reference Design(Load transient)

    SNVM490.TSC (196 KB) - TINA-TI Reference Design
    仿真模型

    LM25117 TINA-TI Transient Reference Design(START UP)

    SNVM491.TSC (226 KB) - TINA-TI Reference Design
    仿真模型

    LM25117 TINA-TI Transient Spice Model

    SNVM492.ZIP (19 KB) - TINA-TI Spice Model
    仿真模型

    LM25117 Unencrypted PSpice Average Model

    SNVM864.ZIP (2 KB) - PSpice Model
    仿真模型

    LM25117 Unencrypted PSpice Transient Model

    SNVM860.ZIP (6 KB) - PSpice Model
    计算工具

    LM25117-5117QUICK-CALC — LM(2)5117 快速入门计算器

    模拟工具

    PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice®

    PSpice® for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence® 的模拟分析引擎。PSpice for TI 可免费使用,包括业内超大的模型库之一,涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

    借助 PSpice for TI 的设计和仿真环境及其内置的模型库,您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案,然后再进行布局和制造,可缩短产品上市时间并降低开发成本。

    在 PSpice for TI 设计和仿真工具中,您可以搜索 TI (...)
    参考设计

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    测试报告: PDF
    原理图: PDF
    参考设计

    PMP10509 — 432W 高效单相同步降压转换器参考设计

    PMP10509 是一种采用 LM25117 控制器 IC 的高效单相同步降压转换器。此设计接受 30.4Vin 至 33.6Vin 输入电压(标称为 32Vin),可实现 24Vout 输出,并且能够为负载提供 18A 连续电流。
    测试报告: PDF
    原理图: PDF
    参考设计

    PMP10514 — 300W 高效单相同步降压转换器参考设计

    PMP10514 是一种采用 LM25117 控制器 IC 的高效单相同步降压转换器。此设计接受 30.4Vin 至 33.6Vin 输入电压(标称为 32Vin),可实现 20 Vout 输出,并且能够为负载提供 15A 连续电流。
    测试报告: PDF
    原理图: PDF
    封装 引脚 下载
    HTSSOP (PWP) 20 查看选项
    WQFN (RTW) 24 查看选项

    订购和质量

    包含信息:
    • RoHS
    • REACH
    • 器件标识
    • 引脚镀层/焊球材料
    • MSL 等级/回流焊峰值温度
    • MTBF/时基故障估算
    • 材料成分
    • 鉴定摘要
    • 持续可靠性监测
    包含信息:
    • 制造厂地点
    • 封装厂地点

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    支持和培训

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