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DC/DC 控制器

LM5117-Q1

現行

具類比電流監控器的汽車級 5.5-65V 大範圍 Vin 電流模式同步降壓控制器

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產品規格表

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，但針腳輸出與所比較的裝置不同。
LM5145-Q1 現行 具有寬占空比範圍的車用 75V 同步降壓 DC/DC 控制器 Improved performance
LM5141-Q1 現行 車用寬輸入 2.2-MHz 低 IQ 同步降壓控制器 Optional spread spectrum for improved EMI.

LM5117-Q1

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive Topology Buck Iout (max) (A) 20 Vin (max) (V) 65 Vin (min) (V) 5.5 Vout (max) (V) 62 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Duty cycle (max) (%) 98 Iq (typ) (A) 0.0048 Number of phases 1 Operating temperature range (°C) -40 to 125
Rating Automotive Topology Buck Iout (max) (A) 20 Vin (max) (V) 65 Vin (min) (V) 5.5 Vout (max) (V) 62 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Duty cycle (max) (%) 98 Iq (typ) (A) 0.0048 Number of phases 1 Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm) WQFN (RTW) 24 16 mm² (4 mm × 4 mm)
  • LM5117-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 5.5 V to 65 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 Overcurrent Protection
  • Programmable Soft-Start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switchover to External Bias Supply
  • Thermal Shutdown
  • LM5117-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 5.5 V to 65 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 Overcurrent Protection
  • Programmable Soft-Start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switchover to External Bias Supply
  • Thermal Shutdown

The LM5117 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 LM5117 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 LM5117’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 LM5117 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 LM5117 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 LM5117’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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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM5117/Q1 Wide Input Range Synchronous Buck Controller with Analog Current Monitor datasheet (Rev. F) PDF | HTML 2015/8/27
白皮書 Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019/4/10
應用說明 Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019/3/12
白皮書 Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018/7/3
類比設計期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016/7/21
應用說明 Precision Output Current Limiting Using Average Current Monitor Feature 2011/6/21

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

LM5117EVAL — LM5117 廣泛 Vin 同步降壓控制器評估模組

The LM5117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM5117 controller IC. The evaluation board provides 12V output with a 9A current capability in addition with average output current (...)

使用指南: PDF
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模擬型號

LM5117 PSpice Transient Model (Rev. A)

SNVM040A.ZIP (82 KB) - PSpice 模型
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模擬型號

LM5117 Unencrypted PSpice Transient Model

SNVM960.ZIP (357 KB) - PSpice 模型
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計算工具

LM5117QUICK-CALC — LM5117 快速入門計算機

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參考設計

PMP30189 — 24V、300W 同步降壓參考設計

PMP30189 參考設計基於 LM5117 同步降壓轉換器，可提供 24V @ 11A 輸出，並具備 13.9A 過電流保護功能。內部偏壓可透過內建線性穩壓器供電，或由外部雙極性接面電晶體 (BJT) 與齊納二極體供電，從而降低 LM5117 的功率損耗。切換頻率也可在 100KHz 和 250KHz 之間選擇。外部追蹤輸入可用於執行排序及緩啟動追蹤。該設計還具備鎖存式輸出過電壓保護功能。
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參考設計

PMP30301 — 12V、80W 同步降壓參考設計

PMP30301 參考設計基於 LM5117 同步降壓轉換器，可提供 12V @ 6.5A 輸出，並具備 7.4A 過電流保護功能。內部偏壓可透過內建線性穩壓器供電，或由外部雙極性接面電晶體 (BJT) 與齊納二極體供電，從而降低 LM5117-Q1 的功率損耗。切換頻率也可在 100KHz 和 250KHz 之間選擇。外部追蹤輸入可用於執行排序及緩啟動追蹤。該設計還具備鎖存式輸出過電壓保護功能。
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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
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