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DC/DC 控制器

LM25141-Q1

現行

具頻率展頻的車用 2.2-MHz，低 IQ 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。
LM25149-Q1 現行 具超低 IQ 和整合式主動 EMI 濾波器的 42-V 車用同步降壓 DC/DC 控制器 Improved EMI performance and reduces filter size.

LM25141-Q1

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive 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 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Rating Automotive 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 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
VQFN (RGE) 24 16 mm² (4 mm × 4 mm)
  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • VIN 3.8 V to 42 V (47 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V to 15 V With ±0.8% Accuracy
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Meets CISPR 25 / EN 55025 EMI Standards
    • Fixed 2.2-MHz or 440-kHz Switching Frequency With ±5% Accuracy
    • High-Side and Low-Side Gate Drive With Slew Rate Control
    • Optional Spread Spectrum
  • Optional Synchronization to an External Clock
  • 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 PWM
  • VQFN-24 Package With Wettable Flanks
  • Create a Custom Design Using the LM25141-Q1 With the WEBENCH® Power Designer
  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • VIN 3.8 V to 42 V (47 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V to 15 V With ±0.8% Accuracy
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Meets CISPR 25 / EN 55025 EMI Standards
    • Fixed 2.2-MHz or 440-kHz Switching Frequency With ±5% Accuracy
    • High-Side and Low-Side Gate Drive With Slew Rate Control
    • Optional Spread Spectrum
  • Optional Synchronization to an External Clock
  • 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 PWM
  • VQFN-24 Package With Wettable Flanks
  • Create a Custom Design Using the LM25141-Q1 With the WEBENCH® Power Designer

The LM25141-Q1 is a synchronous buck controller, intended for high-voltage, wide-VIN, step-down regulator 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-Q1 features slew rate control to simplify the compliance with CISPR and automotive EMI requirements.

The LM25141-Q1 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate drivers with slew rate control can be adjusted to reduce EMI.

In light or no-load conditions, the LM25141-Q1 operates in skip cycle mode for improved low power efficiency. The LM25141-Q1 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-Q1 is a synchronous buck controller, intended for high-voltage, wide-VIN, step-down regulator 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-Q1 features slew rate control to simplify the compliance with CISPR and automotive EMI requirements.

The LM25141-Q1 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate drivers with slew rate control can be adjusted to reduce EMI.

In light or no-load conditions, the LM25141-Q1 operates in skip cycle mode for improved low power efficiency. The LM25141-Q1 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-Q1 2.2-MHz, 42-V Synchronous Buck Controller With Low IQ datasheet (Rev. A) PDF | HTML 2018/2/7
功能安全資訊 LM25141-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 2022/5/10
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
測試報告 PMP15019 Test Results 2017/2/28
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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參考設計

PMP21107 — 具有頻率展頻的寬輸入同步降壓轉換器參考設計

此參考設計運用含頻率展頻的同步降壓控制器，是一款適合汽車應用的同步降壓轉換器。此設計採用電源 SO-8 封裝的雙 MOSFET。強制脈衝寬度調變 (FPWM) 或二極體模擬模式 (DEMB) 可選擇跨接器。功能包括啟用輸入和電源良好旗標。切換頻率設為 440 kHz。頻率抖動及輸入濾波有助於提升 EMI 性能。經修改的頻率補償支援所有陶瓷輸出電容器。
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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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