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DC/DC 切換穩壓器
DC/DC 轉換器

LM2840

現行

SIMPLE SWITCHER® 42V、100mA 降壓型 DC/DC 穩壓器，採用薄型 SOT-23 封装

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

LM2840

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 0.1 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 34 Vout (min) (V) 0.765 Features Enable, Overcurrent protection Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013 Duty cycle (max) (%) 94
Rating Catalog Topology Buck Iout (max) (A) 0.1 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 34 Vout (min) (V) 0.765 Features Enable, Overcurrent protection Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013 Duty cycle (max) (%) 94
SOT-23-THN (DDC) 6 8.12 mm² (2.9 mm × 2.8 mm)
  • 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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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 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 2019/4/9
應用說明 Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024/3/25
應用說明 Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 2014/9/12
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-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (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
應用說明 AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 2013/4/23
應用說明 AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 2013/4/23
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-1197 Selecting Inductors for Buck Converters (Rev. B) 2013/4/23
應用說明 AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 2013/4/23
應用說明 AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 2013/4/23
應用說明 Input and Output Capacitor Selection 2005/9/19
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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模擬型號

LM2840X TINA transient model

SNVM676.TSC (130 KB) - TINA-TI 參考設計
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模擬型號

LM2840X TINA-TI transient model

SNVM677.ZIP (13 KB) - TINA-TI Spice 模型
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LM2840X-Q1 PSpice Transient Model

SNVM329.ZIP (115 KB) - PSpice 模型
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LM2840X-Q1 Unencrypted PSpice Transient Model

SNVMAL8.ZIP (2 KB) - PSpice 模型
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LM2840Y TINA transient Model

SNVM679.ZIP (14 KB) - TINA-TI Spice 模型
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LM2840Y TINA transient Reference Designs

SNVM678.TSC (609 KB) - TINA-TI 參考設計
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LM2840Y-Q1 PSpice Transient Model

SNVM331.ZIP (111 KB) - PSpice 模型
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模擬型號

LM2840Y-Q1 Unencrypted PSpice Transient Model

SNVMAL7.ZIP (2 KB) - PSpice 模型
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-23-THN (DDC) 6 Ultra Librarian
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