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LM1771

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具有精密启用和无需外部补偿组件的低压同步降压控制器

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LM1771

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产品详情

Rating Catalog Iout (max) (A) 6 Vin (max) (V) 5.5 Vin (min) (V) 2.8 Vout (max) (V) 4.5 Vout (min) (V) 0.8 Control mode Constant on-time (COT) Features Enable pin Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 400 Duty cycle (max) (%) 98 Number of phases 1
Rating Catalog Iout (max) (A) 6 Vin (max) (V) 5.5 Vin (min) (V) 2.8 Vout (max) (V) 4.5 Vout (min) (V) 0.8 Control mode Constant on-time (COT) Features Enable pin Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 400 Duty cycle (max) (%) 98 Number of phases 1
VSSOP (DGK) 8 14.7 mm² 3 x 4.9 WSON (NGG) 6 9 mm² 3 x 3
  • Input Voltage Range of 2.8 V to 5.5 V
  • 0.8-V Reference Voltage
  • Precision Enable
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400 µA
  • Internal Soft-Start
  • Short Circuit Protection
  • 6-Pin WSON Package and 8-Pin VSSOP Package
  • Input Voltage Range of 2.8 V to 5.5 V
  • 0.8-V Reference Voltage
  • Precision Enable
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400 µA
  • Internal Soft-Start
  • Short Circuit Protection
  • 6-Pin WSON Package and 8-Pin VSSOP Package

The LM1771 device is an efficient synchronous buck switching controller with a precision enable requiring no external compensation. The constant ON-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. The precision enable pin allows flexibility in sequencing multiple rails and setting UVLO. The LM1771 also incorporates a unique input feedforward to maintain a constant frequency independent of the input voltage. The LM1771 is optimized for a low-voltage input range of 2.8 V to 5.5 V and can provide an adjustable output as low as 0.8 V. Driving an external high-side PFET and low-side NFET, it can provide efficiencies as high as 95%.

Three versions of the LM1771 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100 kHz to 1000 kHz.

The LM1771 device is an efficient synchronous buck switching controller with a precision enable requiring no external compensation. The constant ON-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. The precision enable pin allows flexibility in sequencing multiple rails and setting UVLO. The LM1771 also incorporates a unique input feedforward to maintain a constant frequency independent of the input voltage. The LM1771 is optimized for a low-voltage input range of 2.8 V to 5.5 V and can provide an adjustable output as low as 0.8 V. Driving an external high-side PFET and low-side NFET, it can provide efficiencies as high as 95%.

Three versions of the LM1771 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100 kHz to 1000 kHz.
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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No External Compensation 数据表 (Rev. D) PDF | HTML 2016年 1月 8日
技术文章 How to implement voltage monitoring PDF | HTML 2015年 7月 22日
EVM 用户指南 AN-1477 LM1771 Evaluation Board (Rev. B) 2013年 4月 23日
应用手册 Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) 2013年 4月 23日
应用手册 Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (cn) 最新英语版本 (Rev.A) 2006年 9月 27日
应用手册 Application Note 1477 LM1771 Evaluation Board (cn) 2006年 7月 10日

设计和开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

封装 引脚 CAD 符号、封装和 3D 模型
VSSOP (DGK) 8 Ultra Librarian
WSON (NGG) 6 Ultra Librarian
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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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