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LM5117

現行

具類比電流監控器的 5.5-65V 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,但針腳輸出與所比較的裝置不同。
LM5141 現行 低 Iq、寬輸入範圍雙同步降壓控制器 Optional spread spectrum for improved EMI.

產品詳細資料

Rating Catalog 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 Catalog 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
WQFN (RTW) 24 16 mm² (4 mm × 4 mm) HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 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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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 TINA-TI Transient Reference Design (Rev. A)

SNVM619A.TSC (1077 KB) - TINA-TI 參考設計
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模擬型號

LM5117 TINA-TI Transient Spice Model (Rev. A)

SNVM620A.ZIP (30 KB) - TINA-TI Spice 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

PMP10852 — 高功率小型同步降壓至輸出 12V@15A 參考設計

PMP10852 參考設計使用 LM5117、適用於高壓側 MOSFET 的 CSD18563,以及適用於低壓側 MOSFET 的 CSD18532 (x2)。  PMP10852 的輸入電壓介於 27V 至 41V 之間,並輸出 180W (12V @15A)。  尺寸非常小,解決方案總面積為 1,200mm2 (30mm x 40mm)。該設計全負載時效率約為 95%。

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參考設計

PMP10852B — 高功率小型同步降壓至輸出 12V@15A 參考設計

PMP10852B 參考設計使用 LM5117、適用於高壓側 MOSFET 的 CSD18563,以及適用於低壓側 MOSFET 的 CSD18532 (x2)。  PMP10852B 的輸入電壓介於 27V 至 41V 之間,並輸出 180W (12V @15A)。  尺寸非常小,解決方案總面積為 1,200mm2 (30mm x 40mm)。該設計全負載時效率約為 95%。

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參考設計

PMP20808 — 450W 高效 25V 降壓轉換器參考設計

PMP20808 是採用 LM5117 控制器 IC 的單相同步降壓轉換器參考設計。此設計接受 36Vin 至 38Vin 的輸入電壓(額定 38Vin),並提供 25Vout 的輸出,可為負載提供 18A 連續電流。此設計以 PMP9280 PCB 為基礎,並已針對 PMP20808 設計配置與需求進行修改。PCB 為 4 層電路板,各層皆為 1oz 銅。
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參考設計

PMP20904 — 適合工業應用的 100W 負輸出電源供應參考設計

PMP20904 參考設計是一款採用 LM5117 控制器的負壓降壓轉換器方案,專為工業應用設計。此設計可在 +/-10%,24Vin 條件下運作。此設計具備 -24V 輸出,可供應 2A 連續電流及高達 4A 暫態電流。切換頻率設為 200kHz,並使用 4 層 PCB。
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
WQFN (RTW) 24 Ultra Librarian
HTSSOP (PWP) 20 Ultra Librarian

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