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LM3477

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用于开关稳压器的高效高侧 N 通道控制器

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LM3477

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产品详情

Vin (min) (V) 2.95 Vin (max) (V) 35 Iout (max) (A) 6 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 1.265 Vout (max) (V) 31 Iq (typ) (A) 0.002 Duty cycle (max) (%) 93
Vin (min) (V) 2.95 Vin (max) (V) 35 Iout (max) (A) 6 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 1.265 Vout (max) (V) 31 Iq (typ) (A) 0.002 Duty cycle (max) (%) 93
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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类型 标题 下载最新的英语版本 日期
* 数据表 LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator 数据表 (Rev. K) 2013年 3月 21日
用户指南 LM3477 降压控制器评估模块用户指南 (Rev. F) PDF | HTML 英语版 (Rev.F) PDF | HTML 2022年 7月 8日
选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
选择指南 电源管理指南 2018 (Rev. R) 2018年 6月 25日
模拟设计期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日

设计和开发

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封装 引脚 下载
VSSOP (DGK) 8 查看选项
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订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

支持和培训

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