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DC/DC 轉換器

LMR14050

現行

具 40-μA IQ 的 SIMPLE SWITCHER® 40-V、5-A、2.2-MHz 降壓轉換器

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產品規格表

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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。
LMR51450 現行 36-V、5-A 同步降壓轉換器 Smaller solution size, higher efficiency and lower EMI.

LMR14050

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 5 Vin (max) (V) 40 Vin (min) (V) 4 Vout (max) (V) 36 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Tracking, UVLO adjustable Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00004 Duty cycle (max) (%) 98
Rating Catalog Topology Buck Iout (max) (A) 5 Vin (max) (V) 40 Vin (min) (V) 4 Vout (max) (V) 36 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Tracking, UVLO adjustable Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00004 Duty cycle (max) (%) 98
HSOIC (DDA) 8 29.4 mm² (4.9 mm × 6 mm)
  • 4V to 40V input range
  • 5A continuous output current
  • Ultra-low 40µA operating quiescent current
  • 90mΩ high-side MOSFET
  • 75ns minimum switch-on time
  • Current mode control
  • Adjustable switching frequency from 200kHz to 2.5MHz
  • Frequency synchronization to external clock
  • Internal compensation for ease of use
  • High duty cycle operation supported
  • Precision enable input
  • 1µA shutdown current
  • External soft start
  • Thermal, overvoltage, and short protection
  • 8-pin HSOIC with PowerPAD™ package
  • 4V to 40V input range
  • 5A continuous output current
  • Ultra-low 40µA operating quiescent current
  • 90mΩ high-side MOSFET
  • 75ns minimum switch-on time
  • Current mode control
  • Adjustable switching frequency from 200kHz to 2.5MHz
  • Frequency synchronization to external clock
  • Internal compensation for ease of use
  • High duty cycle operation supported
  • Precision enable input
  • 1µA shutdown current
  • External soft start
  • Thermal, overvoltage, and short protection
  • 8-pin HSOIC with PowerPAD™ package

The LMR14050 is a 40V, 5A, step-down regulator with an integrated high-side MOSFET. With a wide input range from 4V to 40V, the device is designed for various applications from industrial to automotive for power conditioning from unregulated sources. The regulator quiescent current is 40µA in sleep mode, which is designed for battery powered systems. An ultra-low 1µA current in shutdown mode can further prolong battery life. A wide adjustable switching frequency range allows either efficiency or external component size to be optimized. Internal loop compensation means that the user is free from the tedious task of loop compensation design. Internal loop compensation also minimizes the external components of the device. A precision enable input allows simplification of regulator control and system power sequencing. The device also has built-in protection features such as cycle-by-cycle current limit, thermal sensing and shutdown due to excessive power dissipation, and output overvoltage protection.

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The LMR14050 is a 40V, 5A, step-down regulator with an integrated high-side MOSFET. With a wide input range from 4V to 40V, the device is designed for various applications from industrial to automotive for power conditioning from unregulated sources. The regulator quiescent current is 40µA in sleep mode, which is designed for battery powered systems. An ultra-low 1µA current in shutdown mode can further prolong battery life. A wide adjustable switching frequency range allows either efficiency or external component size to be optimized. Internal loop compensation means that the user is free from the tedious task of loop compensation design. Internal loop compensation also minimizes the external components of the device. A precision enable input allows simplification of regulator control and system power sequencing. The device also has built-in protection features such as cycle-by-cycle current limit, thermal sensing and shutdown due to excessive power dissipation, and output overvoltage protection.

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open-in-new 比較替代產品
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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 LMR14050 SIMPLE SWITCHER® Power Converter 40V, 5A, 2.2MHz Step-Down Converter With 40µA IQ datasheet (Rev. B) PDF | HTML 2024/12/20
應用說明 Simple Solution for EMI Filter Stability Issue in DC/DC Converters (Rev. A) 2019/4/25
應用說明 How to Evaluate Junction Temperature Properly with Thermal Metrics (Rev. B) 2019/3/29
應用說明 How SYNC Logic Affects EMI Performance for Dual-Channel Buck Converters 2018/4/27
技術文章 There are more ways than you think to reduce conducted EMI PDF | HTML 2018/4/17
應用說明 Design Feedforward Capacitor for LMR14020 2017/12/20
應用說明 How to Evaluate the Maximum Inductor in Internal Compensation PCM Buck Converter 2017/9/20
應用說明 Extending Buck Regulator to Positive Buck-Boost Configuration 2017/9/2
應用說明 AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 2013/4/24
應用說明 AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 2013/4/23
應用說明 AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 2013/4/23
更多文件說明 SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 2005/7/12
應用說明 AN-643 EMI/RFI Board Design (Rev. B) 2004/5/3

設計與開發

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開發板

LMR14050SEVM — LMR14050S 降壓式轉換器評估模組

LMR14050SEVM 是完全組裝過且經測試的電路，可用於評估 LMR14050S 的降壓轉換器。LMR14050SEVM 的運作輸入電壓範圍為 7V 至 36V（額定電壓為 12V），並可提供 5.0V 或 3.3V (5A) 的輸出。該電路板也配備跳線連接器，以啟用或停用轉換器運作、變更輸出電壓以及與外部時脈同步。電路板還具備用於回饋迴路量測的 AC 訊號注入端子。

使用指南: PDF
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模擬型號

LMR14050S PSPICE Transient Model

SNVM708.ZIP (62 KB) - PSpice 模型
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模擬型號

LMR14050S Unencrypted PSpice Transient Model

SNVM923.ZIP (6 KB) - PSpice 模型
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參考設計

PMP10680 — 4.5V 至 24V 廣泛輸入、負 5V/2A 輸出非同步轉換器參考設計

PMP10680 參考設計是具有降壓升壓配置的非同步降壓轉換器。PMP10680 接受 4.5 至 24Vin 的輸入電壓，並提供負 5V 輸出，能夠供應 2A 連續電流給負載。憑藉負電壓輸出和自給正電壓輸入，此參考設計可用於雙極放大器/ADC/DAC 電源。內部補償，方便使用。

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參考設計

TIDA-01458 — 用於超音波 CW 脈衝產生器的低雜訊固定降壓 ±2.5 至 ±12V 輸出電壓 3A 電源參考設計

此參考設計允許數位可編程電源供應器從 24V 匯流排為連續波 (CW) 模式的超音波發射電路供電，在使用者軟體控制下，共有兩個可調整輸出，範圍從 ±2.5 至 ±12V。這些輸出可在正負穩壓器輸出上提供高達 2A 的超低漣波與雜訊。此電源供應器可透過並聯增加更多穩壓器，針對高達 3A 的高輸出電流進行擴充。電源供應器也可與外部時鐘同步。
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