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DC/DC 控制器

LM25141

現行

低 Iq、寬輸入範圍雙同步降壓控制器

立即訂購
產品規格表

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功能相同，但針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.

LM25141

現行
立即訂購

產品詳細資料

Rating Catalog Topology Buck Controller Iout (max) (A) 30 Vin (max) (V) 42 Vin (min) (V) 3.8 Vout (max) (V) 15 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Spread Spectrum Duty cycle (max) (%) 96 Iq (typ) (A) 0.000035 Number of phases 1 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Buck Controller Iout (max) (A) 30 Vin (max) (V) 42 Vin (min) (V) 3.8 Vout (max) (V) 15 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Spread Spectrum Duty cycle (max) (%) 96 Iq (typ) (A) 0.000035 Number of phases 1 Operating temperature range (°C) -40 to 125
VQFN (RGE) 24 16 mm² (4 mm × 4 mm)
  • –40°C to +125°C Ambient Operating Temperature Range
  • An AEC-Q100 Qualified Device is Available
  • VIN 3.8 V to 45 V (47 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V - 15 V with ±0.8% Accuracy
  • Fixed 2.2 MHz or 440 kHz Switching Frequency with ±5% Accuracy
  • High-Side and Low-Side Gate Drive With Slew Rate Control
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Optional Synchronization to an External Clock
  • Optional Spread Spectrum
  • Shutdown Mode IQ: 10 µA Typical
  • Low Standby Mode IQ: 35 µA Typical
  • 75 mV Current Limit Threshold with ±0.9% Accuracy
  • External Resistor or DCR Current Sensing
  • Output Enable Logic Input
  • Hiccup Mode for Sustained Overload
  • Power Good Indication Output
  • Selectable Diode Emulation or Forced Pulse Width Modulation
  • QFN-24 Package with Wettable Flanks
  • Create a Custom Design Using the LM25141 With the WEBENCH® Power Designer
  • –40°C to +125°C Ambient Operating Temperature Range
  • An AEC-Q100 Qualified Device is Available
  • VIN 3.8 V to 45 V (47 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V - 15 V with ±0.8% Accuracy
  • Fixed 2.2 MHz or 440 kHz Switching Frequency with ±5% Accuracy
  • High-Side and Low-Side Gate Drive With Slew Rate Control
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Optional Synchronization to an External Clock
  • Optional Spread Spectrum
  • Shutdown Mode IQ: 10 µA Typical
  • Low Standby Mode IQ: 35 µA Typical
  • 75 mV Current Limit Threshold with ±0.9% Accuracy
  • External Resistor or DCR Current Sensing
  • Output Enable Logic Input
  • Hiccup Mode for Sustained Overload
  • Power Good Indication Output
  • Selectable Diode Emulation or Forced Pulse Width Modulation
  • QFN-24 Package with Wettable Flanks
  • Create a Custom Design Using the LM25141 With the WEBENCH® Power Designer

The LM25141 is a synchronous buck controller, intended for high voltage wide VIN step-down converter applications. The control method is peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The LM25141 features slew rate control to simplify the compliance with EMI requirements.

The LM25141 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate Drivers with slew rate control that can be adjusted to reduce EMI.

In light or no-load conditions, the LM25141 operates in skip cycle mode for improved low power efficiency. The LM25141 has a high voltage bias regulator with automatic switch-over to an external bias to reduce the IQ current from VIN. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overload, and power good output.

The LM25141 is a synchronous buck controller, intended for high voltage wide VIN step-down converter applications. The control method is peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The LM25141 features slew rate control to simplify the compliance with EMI requirements.

The LM25141 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate Drivers with slew rate control that can be adjusted to reduce EMI.

In light or no-load conditions, the LM25141 operates in skip cycle mode for improved low power efficiency. The LM25141 has a high voltage bias regulator with automatic switch-over to an external bias to reduce the IQ current from VIN. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overload, and power good output.

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技術文件

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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 LM25141 Wide Input Range Synchronous Buck Controller datasheet PDF | HTML 2017/2/2
功能安全資訊 LM25141 Functional Safety FIT Rate, Failure Mode Distribution, and Pin FMA PDF | HTML 2022/4/5
電子書 An Engineer’s Guide to Low EMI in DC/DC Regulators 2021/4/21
白皮書 Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019/4/10
白皮書 An overview of radiated EMI specifications for power supplies 2018/6/5
白皮書 An overview of conducted EMI specifications for power supplies 2018/2/1
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 2017/11/13
類比設計期刊 Designing the front-end DC/DC conversion stage to withstand automotive transient 2017/1/18
類比設計期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016/7/21

設計與開發

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開發板

LM5141QRGEVM — LM5141QRG 同步降壓轉換器評估模組

LM5141QRGEVM 評估板提供全功能降壓電源供應器，採用峰值電流模式控制。評估板提供 5.0V @ 5A。額定輸入電壓範圍為 8V-18V。
使用指南: PDF
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模擬型號

LM5141-Q1 and LM25141-Q1 PSpice Transient Model (Rev. A)

SNVMAU4A.ZIP (123 KB) - PSpice 模型
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計算工具

LM25141DESIGN-CALC — LM25141-Q1 controller quickstart design tool

歡迎使用 LM25141-Q1 快速入門計算機設計工具。此獨立工具協助電源供應工程師基於 LM25141-Q1 42-V 同步降壓 DC/DC 控制器（具備低 IQ）設計 DC/DC 降壓穩壓器。因此，使用者可以迅速達到最佳化的設計，以符合應用需求
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VQFN (RGE) 24 Ultra Librarian
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