LM25117 (正在供货)

Wide Input Range Synchronous Buck Controller with Analog Current Monitor

 

描述

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.


特性

  • 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)

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    参数 与其它产品相比 降压控制器 (外部开关)

     
    Vin (Min) (V)
    Vin (Max) (V)
    Vout (Min) (V)
    Vout (Max) (V)
    Iout (Max) (A)
    Regulated Outputs (#)
    Number of Phases
    Switching Frequency (Min) (kHz)
    Switching Frequency (Max) (kHz)
    Iq (Typ) (mA)
    Features
    Duty Cycle (Max) (%)
    Operating Temperature Range (C)
    Rating
    Package Group
    Control Mode
    LM25117 LM25116 LM25117-Q1 LM25119 LM25141 LM25145 LM3150 LM5119 TPS40200
    4.5    6    4.5    4.5    3.8    6    6    5.5    4.5   
    42    42    42    42    42    42    42    65    52   
    0.8    1.215    0.8    0.8    1.5    0.8    0.6    0.8    0.7   
    41    36    41    41.3    15    40    40    64    46   
    20    20    20    40    20    30    12    15    3   
    1    1    1    2    1    1    1    2    1   
    1    1    1    2    1    1    1    2    1   
    50    50    50    50    350    100    200    50    35   
    750    1000    750    750    2600    1000    1000    750    500   
    4.8    4.6    4.8    6    0.035    1.8    3.5    6    1.5   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Synchronous Rectification
    Tracking
    UVLO Adjustable   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Synchronous Rectification   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Synchronous Rectification
    Tracking
    UVLO Adjustable   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Synchronous Rectification
    UVLO Adjustable   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Power Good
    Pre-Bias Start-Up
    Spread Spectrum
    Synchronous Rectification
    UVLO Fixed   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Power Good
    Pre-Bias Start-Up
    Synchronous Rectification
    Tracking
    UVLO Adjustable   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Pre-Bias Start-Up
    Synchronous Rectification
    UVLO Adjustable   
    Adjustable Current Limit
    Enable
    Frequency Synchronization
    Light Load Efficiency
    Synchronous Rectification
    UVLO Adjustable   
    Frequency Synchronization   
    98    98    98    98    99    99    96    98    90   
    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 85   
    Catalog    Catalog    Automotive    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
    HTSSOP
    WQFN   
    HTSSOP    HTSSOP
    WQFN   
    WQFN    VQFN    VQFN    HTSSOP    WQFN    SOIC
    SON   
    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Voltage Mode    COT with emulated ripple    Current Mode    Voltage Mode   

    其它合格版本 LM25117

    版本 器件型号 定义
    汽车电子 LM25117-Q1 Q100 适用于追求零缺陷的高可靠性汽车电子应用的器件
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    WEBENCH® Designer LM25117

      最小   最大 范围
    输入电压  V 4.5 to 42.0V
    输出电压  V 0.8 to 41.0V
    输出电流  A ≤ 17A
    环境温度  °C -40 to 125°C


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