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AC/DC & DC/DC controllers (external FET)

LM1770

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具有无需外部补偿组件的低电压 SOT23 同步降压控制器

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LM1770

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产品详情

Vin (min) (V) 2.8 Vin (max) (V) 5.5 Iout (max) (A) 4 Operating temperature range (°C) -40 to 125 Control mode Constant on-time (COT) Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 4.5 Iq (typ) (A) 0.0004 Duty cycle (max) (%) 98
Vin (min) (V) 2.8 Vin (max) (V) 5.5 Iout (max) (A) 4 Operating temperature range (°C) -40 to 125 Control mode Constant on-time (COT) Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 4.5 Iq (typ) (A) 0.0004 Duty cycle (max) (%) 98
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • Input Voltage Range of 2.8V to 5.5V
  • 0.8V Reference Voltage
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400µA
  • Internal Soft-start
  • Short Circuit Protection
  • 5-Pin SOT-23 Package

All trademarks are the property of their respective owners.

  • Input Voltage Range of 2.8V to 5.5V
  • 0.8V Reference Voltage
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400µA
  • Internal Soft-start
  • Short Circuit Protection
  • 5-Pin SOT-23 Package

All trademarks are the property of their respective owners.

The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package. The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage. The LM1770 is optimized for a low voltage input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.

Three versions of the LM1770 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100kHz to 1000kHz.

The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package. The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage. The LM1770 is optimized for a low voltage input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.

Three versions of the LM1770 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100kHz to 1000kHz.
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类型 标题 下载最新的英语版本 日期
* 数据表 LM1770 Low-V SOT23 Synch Buck Cntrr w/No Ext Compensation 数据表 (Rev. C) 2013年 4月 3日
EVM 用户指南 AN-1400 LM1770 Evaluation Board (Rev. B) 2013年 4月 23日
应用手册 AN-1414 LM1770 Design Reference (Rev. A) 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 FPGA所需的电源供应：深入分析 英语版 2007年 3月 22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 1414 LM1770 Design Reference (cn) 最新英语版本 (Rev.A) 2005年 11月 8日
应用手册 Application Note 1400 LM1770 Evaluation Board (cn) 2005年 9月 30日

设计和开发

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SOT-23 (DBV) 5 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

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