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AC/DC & DC/DC converters (integrated FET)

LM2841

現行

採用薄 SOT-23 封裝的 4.5V 至 42V、300mA SIMPLE SWITCHER® 降壓轉換器

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LMR54406 現行 具有 4-V 至 36-V、0.6-A 同步降壓和 80-µA IQ 的 SIMPLE SWITCHER® 電源轉換器 Smaller footprint, lower quiescent current, FPWM and PFM options.

LM2841

現行
產品規格表 立即訂購

產品詳細資料

Iout (max) (A) 0.3 Vin (min) (V) 4.5 Vin (max) (V) 42 Topology Buck Type Converter Switching frequency (min) (kHz) 950 Switching frequency (max) (kHz) 1500 Features Enable, Over Current Protection Control mode current mode Vout (min) (V) 0.765 Vout (max) (V) 34 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013
Iout (max) (A) 0.3 Vin (min) (V) 4.5 Vin (max) (V) 42 Topology Buck Type Converter Switching frequency (min) (kHz) 950 Switching frequency (max) (kHz) 1500 Features Enable, Over Current Protection Control mode current mode Vout (min) (V) 0.765 Vout (max) (V) 34 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • Input voltage 4.5 V to 42 V
  • Output current options of 100 mA, 300 mA, and 600 mA
  • Feedback pin voltage of 0.765 V
  • 550-kHz (X) or 1.25-MHz (Y) switching frequency
  • Low shutdown IQ: 16-µA typical
  • Short-circuit protected
  • Internally compensated
  • Soft-start circuitry
  • Small overall solution size (SOT-6L package)
  • Create a custom design using the LM2840 (or LM2841/42) with the WEBENCH® Power Designer
  • Input voltage 4.5 V to 42 V
  • Output current options of 100 mA, 300 mA, and 600 mA
  • Feedback pin voltage of 0.765 V
  • 550-kHz (X) or 1.25-MHz (Y) switching frequency
  • Low shutdown IQ: 16-µA typical
  • Short-circuit protected
  • Internally compensated
  • Soft-start circuitry
  • Small overall solution size (SOT-6L package)
  • Create a custom design using the LM2840 (or LM2841/42) with the WEBENCH® Power Designer

The LM284x SIMPLE SWITCHER™ devices are PWM DC/DC buck (step-down) regulators. With an input range from 4.5 V to 42 V, they are suitable for a wide range of applications, such as power conditioning from unregulated sources. They feature a low RDSON (0.9‑Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 550 kHz (X option) and 1.25 MHz (Y option), allowing the use of small external components while still being able to have low output voltage ripple. Soft start can be implemented using the shutdown (SHDN) pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LM2840 is optimized for up to 100 mA, the LM2841 for up to 300 mA, and the LM2842 for up to 600‑mA load currents. They all have a 0.765-V nominal feedback voltage.

Additional features include: thermal shutdown, VIN undervoltage lockout, and gate-drive undervoltage lockout. The LM284x are available in a low-profile SOT-6L package.

The LM284x SIMPLE SWITCHER™ devices are PWM DC/DC buck (step-down) regulators. With an input range from 4.5 V to 42 V, they are suitable for a wide range of applications, such as power conditioning from unregulated sources. They feature a low RDSON (0.9‑Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 550 kHz (X option) and 1.25 MHz (Y option), allowing the use of small external components while still being able to have low output voltage ripple. Soft start can be implemented using the shutdown (SHDN) pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LM2840 is optimized for up to 100 mA, the LM2841 for up to 300 mA, and the LM2842 for up to 600‑mA load currents. They all have a 0.765-V nominal feedback voltage.

Additional features include: thermal shutdown, VIN undervoltage lockout, and gate-drive undervoltage lockout. The LM284x are available in a low-profile SOT-6L package.
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LMR14203 現行 採用 SOT-23 封裝的 4.5V 至 42V、0.3A 降壓 DC/DC 切換穩壓器 Next-generation 4.5-V to 42-V, 300-mA SIMPLE SWITCHER buck converter for cost-optimized solution.

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類型 標題 日期
* Data sheet LM284x SIMPLE SWITCHER® 4.5-V to 42-V Input, 0.1-, 0.3-, or 0.6-A Output Step-Down DC/DC Regulator in Thin SOT datasheet (Rev. K) PDF | HTML 2019年 4月 9日
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024年 3月 25日
Technical article Quantifying the value of wide VIN PDF | HTML 2016年 6月 15日
Technical article DC/DC converter datasheets – System losses demystified PDF | HTML 2016年 4月 25日
Technical article DC/DC converter datasheets – System efficiency demystified PDF | HTML 2016年 4月 18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
EVM User's guide AN-1876 LM2841 Evaluation Board (Rev. C) 2013年 4月 25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-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (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 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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開發板

LM2841YMK-ADJEV — 適用於 LM2841 的評估板

The LM2841 evaluation board is designed to provide the design engineer with a fully functional power converter based on the buck topology to evaluate the LM2841 series of buck regulators. The evaluation board comes populated with the LM2841YMK-ADJL but can easily be modified to accommodate any of (...)

使用指南: PDF
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模擬型號

LM2841X PSpice Average Model

SNVM225.ZIP (53 KB) - PSpice Model
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模擬型號

LM2841X PSpice Transient Model

SNVM224.ZIP (182 KB) - PSpice Model
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模擬型號

LM2841X TINA-TI Reference Design

SNVMAW7.TSC (283 KB) - TINA-TI Reference Design
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模擬型號

LM2841X Unencrypted PSpice Average Model

SNVM858.ZIP (1 KB) - PSpice Model
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模擬型號

LM2841X Unencrypted PSpice Transient Model

SNVM859.ZIP (2 KB) - PSpice Model
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LM2841Y PSpice Average Model

SNVM303.ZIP (52 KB) - PSpice Model
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模擬型號

LM2841Y PSpice Transient Model

SNVM304.ZIP (190 KB) - PSpice Model
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模擬型號

LM2841Y TINA-TI Reference Design

SNVMAW6.TSC (282 KB) - TINA-TI Reference Design
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模擬型號

LM2841Y Unencrypted PSpice Average Model

SNVM857.ZIP (1 KB) - PSpice Model
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模擬型號

LM2841Y Unencrypted PSpice Transient Model

SNVM856.ZIP (2 KB) - PSpice Model
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參考設計

PMP7233 — 適用於汽車應用的強制運轉模擬器參考設計

This design is a cranking simulator which generates three different cranking pulses to test automotive systems up to 50W. A microcontroller sets the output voltage of a synchronous buck in the range of 2-15V accordingly to the programmed curves. Output current is in the range of 3.3-25A. It is a (...)
Test report: PDF
電路圖: PDF
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