Wide Input Range Synchronous Buck Controller with Analog Current Monitor - LM25117-Q1

LM25117-Q1 (供給中)

Wide Input Range Synchronous Buck Controller with Analog Current Monitor

 

概要

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 undervoltage lockout.

特長

  • LM25117-Q1 is Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: -40°C to 125°C
      Ambient Operating Temperature Range
  • Emulated Peak Current Mode Control
  • Wide Operating Range from 4.5 V to 42 V
  • Robust 3.3 A Peak Gate Drives
  • Adaptive Dead-time Output Driver Control
  • Free-run or Synchronizable Clock up to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Analog Current Monitor
  • Programmable Current Limit
  • Hiccup Mode Over Current Protection
  • Programmable Soft-start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switch-over to External Bias Supply
  • Thermal Shutdown

詳細を表示

機能一覧 他の製品と比較 降圧型コントローラ (スイッチ外付け)

 
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-Q1 LM25117 LM25119 LM25119Q LM25141-Q1 LM5117-Q1 LM5119 LM5119Q LM5140-Q1 LM5141-Q1 LM5642 TPS40170-Q1
4.5    4.5    4.5    4.5    3.8    5.5    5.5    5.5    3.8    3.8    4.5    4.5   
42    42    42    42    42    65    65    65    65    65    36    60   
0.8    0.8    0.8    0.8    1.5    0.8    0.8    0.8    1.5    1.5    1.236    0.6   
41    41    41.3    41.3    15    62    64    64    15    15    34    57   
20    20    40    40    20    20    15    15    40    20    20    20   
1    1    2    2    1    1    2    2    2    1    2    1   
1    1    2    2    1    1    2    2    1    1    2    1   
50    50    50    50    350    50    50    50    350    350    150    100   
750    750    750    750    2600    750    750    750    2600    2600    250    600   
4.8    4.8    6    6    0.035    4.8    6    6    0.035    0.035    1.1    4.5   
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
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
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
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
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Adjustable Current Limit
Enable
Frequency Synchronization
Synchronous Rectification   
Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable   
98    98    98    98    99    98    98    98    78    78    99    95   
-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 150    -40 to 150    -40 to 125    -40 to 125   
Automotive    Catalog    Catalog    Automotive    Automotive    Automotive    Catalog    Automotive    Automotive    Automotive    Catalog    Automotive   
HTSSOP
WQFN   
HTSSOP
WQFN   
WQFN    WQFN    VQFN    HTSSOP
WQFN   
WQFN    WQFN    VQFNP    VQFN    HTSSOP
TSSOP   
VQFN   
Current Mode    Current Mode    Current Mode      Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Voltage Mode   

その他の認定バージョン LM25117-Q1

バージョン 型番 定義
カタログ製品 LM25117 TI の標準カタログ製品
New! Interactive Design
Interactive Design は、 Internet Explorer 9 以上のバージョンもしくは、 Firefox 、Chromeでご利用いただけます。設計パラメータを入力して、フル・バージョンの WEBENCH® 設計支援ツールをご利用ください。

WEBENCH® Designer LM25117-Q1

  最小   最大 範囲
入力電圧  V 4.5 to 42.0V
出力電圧  V 0.8 to 41.0V
負荷電流  A ≤ 17A
周囲温度  °C -40 to 125°C


電源占有面積 部品コスト 効率


Preview design