LM3477

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用于開關穩壓器的高效高側 N 溝道控制器

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產品詳情

Rating Catalog Topology Buck Iout (max) (A) 6 Vin (max) (V) 35 Vin (min) (V) 2.95 Vout (max) (V) 31 Vout (min) (V) 1.265 Control mode current mode Features Enable Operating temperature range (°C) -40 to 125 Iq (typ) (μA) 2000 Duty cycle (max) (%) 93 Number of phases 1
Rating Catalog Topology Buck Iout (max) (A) 6 Vin (max) (V) 35 Vin (min) (V) 2.95 Vout (max) (V) 31 Vout (min) (V) 1.265 Control mode current mode Features Enable Operating temperature range (°C) -40 to 125 Iq (typ) (μA) 2000 Duty cycle (max) (%) 93 Number of phases 1
VSSOP (DGK) 8 14.7 mm2 3 x 4.9
  • 500kHz Switching Frequency
  • Adjustable Current Limit
  • 1.5% Reference
  • Thermal Shutdown
  • Frequency Compensation Optimized with a Single Capacitor and Resistor
  • Internal Softstart
  • Current Mode Operation
  • Undervoltage Lockout with Hysteresis
  • 8-lead (VSSOP-8) Package

All trademarks are the property of their respective owners.

  • 500kHz Switching Frequency
  • Adjustable Current Limit
  • 1.5% Reference
  • Thermal Shutdown
  • Frequency Compensation Optimized with a Single Capacitor and Resistor
  • Internal Softstart
  • Current Mode Operation
  • Undervoltage Lockout with Hysteresis
  • 8-lead (VSSOP-8) Package

All trademarks are the property of their respective owners.

The LM3477/A is a high-side N-channel MOSFET switching regulator controller. It can be used in topologies requiring a high side MOSFET such as buck, inverting (buck-boost) and zeta regulators. The LM3477/A's internal push pull driver allows compatibility with a wide range of MOSFETs. This, the wide input voltage range, use of discrete power components and adjustable current limit allows the LM3477/A to be optimized for a wide variety of applications.

The LM3477/A uses a high switching frequency of 500kHz to reduce the overall solution size. Current-mode control requires only a single resistor and capacitor for frequency compensation. The current mode architecture also yields superior line and load regulation and cycle-by-cycle current limiting. A 5µA shutdown state can be used for power savings and for power supply sequencing. Other features include internal soft-start and output over voltage protection. The internal soft-start reduces inrush current. Over voltage protection is a safety feature to ensure that the output voltage stays within regulation.

The LM3477A is similar to the LM3477. The primary difference between the two is the point at which the device transitions into hysteretic mode. The hysteretic threshold of the LM3477A is one-third of the LM3477.

The LM3477/A is a high-side N-channel MOSFET switching regulator controller. It can be used in topologies requiring a high side MOSFET such as buck, inverting (buck-boost) and zeta regulators. The LM3477/A's internal push pull driver allows compatibility with a wide range of MOSFETs. This, the wide input voltage range, use of discrete power components and adjustable current limit allows the LM3477/A to be optimized for a wide variety of applications.

The LM3477/A uses a high switching frequency of 500kHz to reduce the overall solution size. Current-mode control requires only a single resistor and capacitor for frequency compensation. The current mode architecture also yields superior line and load regulation and cycle-by-cycle current limiting. A 5µA shutdown state can be used for power savings and for power supply sequencing. Other features include internal soft-start and output over voltage protection. The internal soft-start reduces inrush current. Over voltage protection is a safety feature to ensure that the output voltage stays within regulation.

The LM3477A is similar to the LM3477. The primary difference between the two is the point at which the device transitions into hysteretic mode. The hysteretic threshold of the LM3477A is one-third of the LM3477.
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類型 標題 下載最新的英語版本 日期
* 數據表 LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator 數據表 (Rev. K) 2013年 3月 21日
用戶指南 LM3477 降壓控制器評估模塊用戶指南 (Rev. F) PDF | HTML 英語版 (Rev.F) PDF | HTML 2022年 7月 8日
選擇指南 電源管理指南 2018 (Rev. K) 2018年 7月 31日
選擇指南 電源管理指南 2018 (Rev. R) 2018年 6月 25日
模擬設計期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日

設計和開發

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封裝 引腳 CAD 符號、封裝和 3D 模型
VSSOP (DGK) 8 Ultra Librarian

訂購和質量

包含信息：
  • RoHS
  • REACH
  • 器件標識
  • 引腳鍍層/焊球材料
  • MSL 等級/回流焊峰值溫度
  • MTBF/時基故障估算
  • 材料成分
  • 鑒定摘要
  • 持續可靠性監測
包含信息：
  • 制造廠地點
  • 封裝廠地點

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