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DC/DC 切換穩壓器
DC/DC 控制器

LM3478Q-Q1

現行

具 10µA 關斷電流且適用切換調節器的 40V 寬 VIN 低側 N 通道控制器

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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。
LM5155-Q1 現行 2.2MHz 寬 VIN、1.5A MOSFET 驅動器、非同步升壓控制器、符合 AEC-Q100 認證 Up to 2.2-MHz Fsw, higher efficiency and up to 45-V input operating voltage.

LM3478Q-Q1

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 40 Vin (min) (V) 2.97 Vout (max) (V) 500 Vout (min) (V) 1.26 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Nonsynchronous rectification, Prebias startup Duty cycle (max) (%) 100 Iq (typ) (A) 0.0027 Operating temperature range (°C) -40 to 125
Rating Automotive Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 40 Vin (min) (V) 2.97 Vout (max) (V) 500 Vout (min) (V) 1.26 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Nonsynchronous rectification, Prebias startup Duty cycle (max) (%) 100 Iq (typ) (A) 0.0027 Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² (3 mm × 4.9 mm)
  • LM3478Q-Q1 is AEC-Q100 qualified and manufactured on an automotive grade flow
  • 8-lead VSSOP-8
  • Internal push-pull driver with 1A peak current capability
  • Current limit and thermal shutdown
  • Frequency compensation optimized with a capacitor and a resistor
  • Internal soft start
  • Current mode operation
  • Undervoltage lockout with hysteresis
  • Key specifications:
    • Wide supply voltage range of 2.97V to 40V
    • 100kHz to 1MHz adjustable clock frequency
    • ±2.5% (overtemperature) internal reference
    • 10µA shutdown current (overtemperature)
  • Create a custom design using the LM3478Q-Q1 with the WEBENCH Power Designer
  • LM3478Q-Q1 is AEC-Q100 qualified and manufactured on an automotive grade flow
  • 8-lead VSSOP-8
  • Internal push-pull driver with 1A peak current capability
  • Current limit and thermal shutdown
  • Frequency compensation optimized with a capacitor and a resistor
  • Internal soft start
  • Current mode operation
  • Undervoltage lockout with hysteresis
  • Key specifications:
    • Wide supply voltage range of 2.97V to 40V
    • 100kHz to 1MHz adjustable clock frequency
    • ±2.5% (overtemperature) internal reference
    • 10µA shutdown current (overtemperature)
  • Create a custom design using the LM3478Q-Q1 with the WEBENCH Power Designer

The LM3478Q-Q1 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478Q-Q1 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478Q-Q1 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478Q-Q1 has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

The LM3478Q-Q1 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478Q-Q1 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478Q-Q1 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478Q-Q1 has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.
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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 LM3478Q-Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters datasheet (Rev. A) PDF | HTML 2025/6/2
Application brief Avoiding Pulse Skip Operation at Light Load Conditions for Asynchronous Boost Converter Designs PDF | HTML 2025/9/16

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

計算工具

FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator

此工具協助電源供應工程師根據規格選擇正確的隔離式 DC-DC 拓撲結構。根據選擇的拓撲結構，計算機還會推薦適合設計的 IC。

支援產品和硬體
計算工具

LM3478-88-BOOST-CALC — LM3478-88 quick start calculator for boost

LM3478-88 quick start calculator for boost topology
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計算工具

LM3478-88-FLYBACK-CALC — LM3478-88 quick start calculator for Flyback

The LM3478-88 Flyback quick start calculator tool assists in the configuration of the power stage and the external components for the LM3478 and LM3488 devices
支援產品和硬體
計算工具

LM3478-88-SEPIC-CALC — LM3478-88 quick start calculator for SEPIC

The LM3478-88 SEPIC quick start calculator tool assists in the configuration of the power stage and the external components for the LM3478 and LM3488.
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參考設計

PMP9382 — 適用於汽車應用 (E-Call) 的高效率低 Vin 30W 升壓轉換器參考設計

PMP9382 是採用汽車級 LM3478Q-Q1 控制器的低 Vin 升壓轉換器。此設計從高於 2.97V (~3.4V) 最小輸入電壓的二極體壓降至最大 6V 輸入電壓開始。一旦啟用電源供應且輸出存在，此設計將可降至 2V 輸入最小值，並在 3A 時提供 10V 的輸出電壓。切換頻率設定為 400kHz。

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VSSOP (DGK) 8 Ultra Librarian
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