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AC/DC 和 DC/DC 控制器 (外部 FET)

LM1771

現行

具精密啟用和無外部補償的低電壓同步降壓控制器

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產品規格表

現在提供此產品的更新版本

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功能與所比較的裝置相似
TPS62827 現行 採用 1.5-mm x 1.5-mm QFN 封裝，具有 1% 準確度的 2.5-V 至 5.5-V 輸入、4-A 降壓轉換器 Smaller solution size DC/DC converter family 1 A, 2 A, 3 A and 4 A

LM1771

現行
產品規格表 立即訂購

產品詳細資料

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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類型 標題 日期
* Data sheet LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No External Compensation datasheet (Rev. D) PDF | HTML 2016年 1月 8日
Technical article How to implement voltage monitoring PDF | HTML 2015年 7月 22日
Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) 2013年 4月 23日

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VSSOP (DGK) 8 Ultra Librarian
WSON (NGG) 6 Ultra Librarian
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