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LM25117-Q1

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具有跟踪功能的汽车级 4.5-42V 宽输入电压、电流模式同步降压控制器

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open-in-new 比较替代产品
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LM25141-Q1 正在供货 具备展频频谱的汽车级 2.2MHz 低 IQ 同步降压控制器 Improved EMI performance, efficiency and lower IQ.

LM25117-Q1

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产品详情

Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Controller Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 41 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 4800 Duty cycle (max) (%) 98 Number of phases 1
Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Controller Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 41 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 4800 Duty cycle (max) (%) 98 Number of phases 1
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

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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
    白皮书 Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018年 7月 3日
    模拟设计期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
    应用手册 带有线路补偿功能的车载USB充电器的设计 2014年 10月 4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
    下载
    仿真模型

    LM25117 PSpice Transient Model (Rev. A)

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

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

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

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

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

    LM25117 TINA-TI Transient Reference Design(Load transient)

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

    LM25117 TINA-TI Transient Reference Design(START UP)

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

    LM25117 TINA-TI Transient Spice Model

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

    LM25117 Unencrypted PSpice Average Model

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

    LM25117 Unencrypted PSpice Transient Model

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

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

    下载
    参考设计

    TIDA-00675 — 通过动态切换降低功耗的参考设计

    TIDA-00675 可使用负载开关动态开启/关闭负载，从而降低功耗。设计指南说明了开关频率、占空比和放电电阻的使用如何影响功耗。
    设计指南: PDF
    原理图: PDF
    参考设计

    TIDA-00160 — 具有线路压降补偿的车用 USB 充电器的参考设计

    该设计可将8V-42V直流输入转换成5.1V输出，并受TPS2546-Q1可编程电流保护开关保护。其具有的握手协议可为智能手机/平板/手持式设备实现快速充电。通过检测负载电流，并调节DC/DC输出电压，该设计可实现线性USB线缆压差补偿功能，以保持USB端口电压在限定范围内。该设计适用于车载式主机和远端USB集线器等设备。
    设计指南: PDF
    原理图: PDF
    封装 引脚 CAD 符号、封装和 3D 模型
    HTSSOP (PWP) 20 Ultra Librarian
    WQFN (RTW) 24 Ultra Librarian
    应遵守 TI 评估类商品的标准条款与条件。

    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

    支持和培训

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