LM25117 Wide Input Range Synchronous Buck Controller with Analog Current Monitor | 德州仪器 TI.com.cn

LM25117 (正在供货)

Wide Input Range Synchronous Buck Controller with Analog Current Monitor

Wide Input Range Synchronous Buck Controller with Analog Current Monitor - LM25117
 

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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    
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