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DC/DC 切換穩壓器
DC/DC 轉換器

LM26420

現行

雙 2A 高效同步 DC/DC 轉換器

立即訂購
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。
TPS62442 現行 採用 QFN 封裝的 2.75-V 至 6-V、雙 2-A 或 3-A 和 1-A 降壓轉換器 Next generation dual buck with smaller size wand broader VIN range.

LM26420

現行
立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 2 Vin (max) (V) 5.5 Vin (min) (V) 3 Vout (max) (V) 4.5 Vout (min) (V) 0.8 Features Enable, Light Load Efficiency, Light load efficiency, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0009 Duty cycle (max) (%) 98
Rating Catalog Topology Buck Iout (max) (A) 2 Vin (max) (V) 5.5 Vin (min) (V) 3 Vout (max) (V) 4.5 Vout (min) (V) 0.8 Features Enable, Light Load Efficiency, Light load efficiency, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0009 Duty cycle (max) (%) 98
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm) WQFN (RUM) 16 16 mm² (4 mm × 4 mm)
  • Compliant with CISPR25 Class 5 Conducted Emissions
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.8 V to 4.5 V
  • 2-A Output Current per Regulator
  • High Switching Frequency: 2.2 MHz (LM26420X)
        0.55 MHz (LM26420Y)
  • 0.8 V, 1.5% Internal Voltage Reference
  • Internal Soft Start
  • Independent Power Good and Precision Enable for Each Output
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection
  • Start-up into Prebiased Output Loads
  • Regulators are 180° Out of Phase
  • Create a Custom Design Using the LM26420 With the WEBENCH® Power Designer
  • Compliant with CISPR25 Class 5 Conducted Emissions
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.8 V to 4.5 V
  • 2-A Output Current per Regulator
  • High Switching Frequency: 2.2 MHz (LM26420X)
        0.55 MHz (LM26420Y)
  • 0.8 V, 1.5% Internal Voltage Reference
  • Internal Soft Start
  • Independent Power Good and Precision Enable for Each Output
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection
  • Start-up into Prebiased Output Loads
  • Regulators are 180° Out of Phase
  • Create a Custom Design Using the LM26420 With the WEBENCH® Power Designer

The LM26420 regulator is a monolithic, high-efficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5-V input operating range down to the minimum output voltage of 0.8 V.

Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.

The LM26420 regulator is a monolithic, high-efficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5-V input operating range down to the minimum output voltage of 0.8 V.

Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.

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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 LM26420 Dual 2-A, High-Efficiency Synchronous DC/DC Converter datasheet (Rev. L) PDF | HTML 2018/4/13
選擇指南 Buck Converter Quick Reference Guide (Rev. B) 2021/4/8
技術文章 Design an automotive cluster power supply PDF | HTML 2015/10/16
技術文章 How to overcome automotive front-end design challenges PDF | HTML 2015/9/10
技術文章 How to design a quiet and compact industrial power supply PDF | HTML 2015/7/21
技術文章 Spread Spectrum: Headache tablet or vitamin pill? PDF | HTML 2015/5/18
白皮書 Power Management IC (PMIC) Guide for Automotive (Rev. A) 2014/10/29
應用說明 AN-1973 Benefits and Challenges of High-Frequency Regulators (Rev. A) 2013/4/23

設計與開發

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開發板

LM26420XMHEVAL — LM26420 2.2 MHz、eTSSOP 同步降壓評估板

The LM26420 Evaluation board was designed to provide two 2A outputs, VOUT1 and VOUT2 . It is available in either the eTSSOP package option of the LM26420 for easier probing or the LLP version for evaluating the smaller package. The design emphasizes on the compactness of the LM26420 PCB layout and (...)

使用指南: PDF
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開發板

LM26420XSQEVAL — LM26420 2.2 MHz、LLP 同步降壓評估板

The LM26420 Evaluation board was designed to provide two 2A outputs, VOUT1 and VOUT2 . It is available in either the eTSSOP package option of the LM26420 for easier probing or the LLP version for evaluating the smaller package. The design emphasizes on the compactness of the LM26420 PCB layout and (...)

使用指南: PDF
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模擬型號

LM26420X PSpice Transient Model

SNVMA16.ZIP (132 KB) - PSpice 模型
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模擬型號

LM26420X Unencrypted PSpice Transient Model

SNVMA15.ZIP (5 KB) - PSpice 模型
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模擬型號

LM26420Y PSpice Transient Model

SNVMA14.ZIP (140 KB) - PSpice 模型
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模擬型號

LM26420Y Unencrypted PSpice Transient Model

SNVMA13.ZIP (5 KB) - PSpice 模型
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參考設計

TIDA-01322 — 適用於工業應用的低壓差 (LDO)、高電流和無偏壓軌參考設計

此參考設計運用 LP5922 LDO 線性穩壓器，展示無電壓偏壓軌需求的低雜訊、低壓差 (LDO)、高電流功率級。經過證明的功率級非常適合工業應用。在工業應用中，低雜訊電源的實作通常是依賴在負載點引入 LDO，透過這種方法來清除前一個切換穩壓器功率級中的電壓漣波。LP5922 裝置透過支援超低壓降以高效的方式實現了這一點，也消除了輸入對電壓偏壓的需求。
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參考設計

TIDM-HAHSCPTO — 高可用性高速計數器 (HSC) 和脈衝串輸出 (PTO) 參考設計

此參考設計針對與運動控制相關的兩種不同工業輸入/輸出功能提供韌體和測試平台：高速計數器 (HSC) 和脈衝串輸出 (PTO)。此設計以微控制器平台為基礎，適合在對於高可用性和/或功能安全具有嚴格要求的工業應用中使用。
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
HTSSOP (PWP) 20 Ultra Librarian
WQFN (RUM) 16 Ultra Librarian
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