LM1771
- 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.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 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 | 2016-1-8 | ||
| 技术文章 | How to implement voltage monitoring | PDF | HTML | 2015-7-22 | |||
| 应用手册 | Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) | 2013-4-23 | ||||
| 应用手册 | Application Note 1477 LM1771 Evaluation Board (cn) | 2006-7-10 |
设计与开发
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| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| WSON (NGG) | 6 | Ultra Librarian |
| VSSOP (DGK) | 8 | Ultra Librarian |