LM25117

現行

具追蹤功能的 4.5-42V 大範圍 VIN 電流模式同步降壓控制器

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同,但引腳輸出與所比較的裝置不同
LM25149 現行 具超低 IQ 和整合式主動 EMI 濾波器的 42-V 同步降壓 DC/DC 控制器 Active EMI filtering and DRSS reduces EMI by an average of 25 dBµV.

產品詳細資料

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 Catalog 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 Catalog 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
  • 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
  • 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

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.

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.

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類型 標題 日期
* Data sheet LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor datasheet (Rev. F) PDF | HTML 2015年 8月 27日
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019年 4月 10日
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018年 7月 3日
Application note How to Design a Simple Constant Current/Constant Voltage Buck Converter 2018年 6月 26日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
Analog Design Journal Analog Applications Journal 3Q 2015 2015年 7月 24日
Analog Design Journal Ceramic or electrolytic output capacitors in DC/DC converters—Why not both? 2015年 7月 24日
User guide AN-2065 LM5119 Evaluation Board (Rev. B) 2013年 4月 24日
User guide AN-2103 LM5117 Evaluation Board (Rev. B) 2013年 4月 24日

設計與開發

如需其他條款或必要資源,請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM25117EVAL — LM25117 寬輸入電壓同步降壓控制器評估板

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 (...)

使用指南: PDF
TI.com 無法提供
模擬型號

LM25117 PSpice Average Model

SNVM385.ZIP (51 KB) - PSpice Model
模擬型號

LM25117 PSpice Transient Model (Rev. A)

SNVM386A.ZIP (167 KB) - PSpice Model
模擬型號

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

SNVM488A.TSC (148 KB) - TINA-TI Reference Design
模擬型號

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

SNVM489A.ZIP (8 KB) - TINA-TI Spice Model
模擬型號

LM25117 TINA-TI Transient Reference Design(Load transient)

SNVM490.TSC (196 KB) - TINA-TI Reference Design
模擬型號

LM25117 TINA-TI Transient Reference Design(START UP)

SNVM491.TSC (226 KB) - TINA-TI Reference Design
模擬型號

LM25117 TINA-TI Transient Spice Model

SNVM492.ZIP (19 KB) - TINA-TI Spice Model
模擬型號

LM25117 Unencrypted PSpice Average Model

SNVM864.ZIP (2 KB) - PSpice Model
模擬型號

LM25117 Unencrypted PSpice Transient Model

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

LM25117-5117QUICK-CALC — LM(2)5117 快速入門計算機

參考設計

PMP11114 — 車用輸入雙連接埠 USB Type-C 充電器參考設計

PMP11114 is a dual port USB Type C Charger. This design takes an automotive input voltage (7V to 18V nominal, load dump to 40V).  The output goes to two USB Type ports, each of these ports supplies 5V.  The desgin supports 3A on one port and 1.5A on the other port.  The DC/DC portion (...)
Test report: PDF
電路圖: PDF
參考設計

PMP10509 — 432W 高效率單相同步降壓轉換器參考設計

PMP10509 is a High-Efficiency Single-Phase Synchronous Buck Converter using the LM25117 controller IC. The design accepts an input voltage of 30.4Vin to 33.6Vin (32Vin Nominal) and provides an output of 24Vout capable of supplying 18A of continuous current to the load.
Test report: PDF
電路圖: PDF
參考設計

PMP10514 — 300W 高效率單相同步降壓轉換器參考設計

PMP10514 is a High-Efficiency Single-Phase Synchronous Buck Converter using the LM25117 controller IC. The design accepts an input voltage of 30.4Vin to 33.6Vin (32Vin Nominal) and provides an output of 20 Vout capable of supplying 15A of continuous current to the load.
Test report: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
HTSSOP (PWP) 20 Ultra Librarian
WQFN (RTW) 24 Ultra Librarian

訂購與品質

內含資訊:
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 認證摘要
  • 進行中持續性的可靠性監測
內含資訊:
  • 晶圓廠位置
  • 組裝地點

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