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AC/DC 和 DC/DC 控制器 (外部 FET)

LM1770

現行

具無外部補償的低電壓 SOT23 同步降壓控制器

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LM1770

現行
產品規格表 立即訂購

產品詳細資料

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 Features Light Load Efficiency Iq (typ) (µA) 400 Duty cycle (max) (%) 98 Number of phases 1
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 Features Light Load Efficiency Iq (typ) (µA) 400 Duty cycle (max) (%) 98 Number of phases 1
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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類型 標題 日期
* Data sheet LM1770 Low-V SOT23 Synch Buck Cntrr w/No Ext Compensation datasheet (Rev. C) 2013年 4月 3日
EVM User's guide AN-1400 LM1770 Evaluation Board (Rev. B) 2013年 4月 23日
Application note AN-1414 LM1770 Design Reference (Rev. A) 2013年 4月 23日
Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) 2013年 4月 23日
Application note Advanced Topics in Powering FPGAs 2007年 3月 22日

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SOT-23 (DBV) 5 Ultra Librarian
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