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AC/DC 和 DC/DC 轉換器 (整合式 FET)

LM25574

現行

42V、0.5A 降壓切換穩壓器

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產品規格表

LM25574

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 42 Vin (min) (V) 6 Vout (max) (V) 40 Vout (min) (V) 1.23 Features Frequency synchronization, Overcurrent protection Control mode current mode Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 1000 Duty cycle (max) (%) 95 Type Converter
Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 42 Vin (min) (V) 6 Vout (max) (V) 40 Vout (min) (V) 1.23 Features Frequency synchronization, Overcurrent protection Control mode current mode Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 1000 Duty cycle (max) (%) 95 Type Converter
TSSOP (PW) 16 32 mm² 5 x 6.4
  • Integrated 75V, 750mΩ N-channel MOSFET
  • Ultra-wide input voltage range from 6V to 75V
  • Adjustable output voltage as low as 1.225V
  • 1.5% feedback reference accuracy
  • Operating frequency adjustable between 50kHz and 500kHz with single resistor
  • Controller or peripheral frequency synchronization
  • Adjustable soft start
  • Emulated current mode control architecture
  • Wide bandwidth error amplifier
  • Built-in protection
  • Create a custom design using the LM5574 with the WEBENCH Power Designer
  • Integrated 75V, 750mΩ N-channel MOSFET
  • Ultra-wide input voltage range from 6V to 75V
  • Adjustable output voltage as low as 1.225V
  • 1.5% feedback reference accuracy
  • Operating frequency adjustable between 50kHz and 500kHz with single resistor
  • Controller or peripheral frequency synchronization
  • Adjustable soft start
  • Emulated current mode control architecture
  • Wide bandwidth error amplifier
  • Built-in protection
  • Create a custom design using the LM5574 with the WEBENCH Power Designer

The LM25574 is an easy-to-use, buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6V to 42V, the LM25574 delivers 0.5A of continuous output current with an integrated 750mΩ N-Channel MOSFET. The regulator uses an emulated current mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 1MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple ICs from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25574 specifies robustness with cycle-by-cycle current limit, short-circuit protection, thermal shutdown, and remote shutdown. The device is available in a TSSOP-16 package. The LM25574 is supported by the full suite of WEBENCH online design tools.

The LM25574 is an easy-to-use, buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6V to 42V, the LM25574 delivers 0.5A of continuous output current with an integrated 750mΩ N-Channel MOSFET. The regulator uses an emulated current mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 1MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple ICs from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25574 specifies robustness with cycle-by-cycle current limit, short-circuit protection, thermal shutdown, and remote shutdown. The device is available in a TSSOP-16 package. The LM25574 is supported by the full suite of WEBENCH online design tools.
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類型 標題 日期
* Data sheet LM25574 42V, 0.5A Step-Down Switching Regulator datasheet (Rev. I) PDF | HTML 2025年 4月 25日
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024年 3月 25日
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018年 7月 3日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 2014年 9月 12日
Application note AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) 2013年 5月 6日
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 2013年 4月 24日
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 2013年 4月 23日
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 2013年 4月 23日
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 2013年 4月 23日
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 2013年 4月 23日
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 2013年 4月 23日
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 2013年 4月 23日
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 2013年 4月 23日
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 2013年 4月 23日
Application note Understanding and Applying Current-Mode Control Theory 2007年 8月 19日
Application note Input and Output Capacitor Selection 2005年 9月 19日
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 2005年 7月 12日
Application note AN-643 EMI/RFI Board Design (Rev. B) 2004年 5月 3日

設計與開發

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模擬型號

LM25574 Non-Inverting and Inverting PSpice Transient Model (Rev. A)

SNVM293A.ZIP (120 KB) - PSpice Model
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模擬型號

LM25574 Non-Inverting and Inverting Unencrypted PSpice Transient Model

SNVMBA3.ZIP (4 KB) - PSpice Model
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模擬型號

LM25574 PSpice Average Model

SNVM294.ZIP (56 KB) - PSpice Model
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模擬型號

LM25574 Unencrypted PSpice Average Model

SNVM868.ZIP (2 KB) - PSpice Model
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計算工具

LM2557X-557XQUICK-CALC — LM(2)557x 快速入門 SIMPLE SWITCHER 元件計算機

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計算工具

SIMPLESWITCHER-COMPONENT-CALC — 可下載的 LM(2)557x 快速入門 SIMPLE SWITCHER 元件計算機

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