LM3881
- Easiest Method to Sequence Rails
- Power-Up and Power-Down Control
- Tiny Footprint
- Low Quiescent Current of 80 µA
- Input Voltage Range of 2.7 V to 5.5 V
- Output Invert Feature
- Timing Controlled by Small Value External
Capacitor
The LM3881 Simple Power Sequencer offers the easiest method to control power up and power down of multiple power supplies (switching or linear regulators). By staggering the start-up sequence, it is possible to avoid latch conditions or large inrush currents that can affect the reliability of the system.
Available in VSSOP-8 package, the Simple Sequencer contains a precision enable pin and three open-drain output flags. When the LM3881 is enabled, the three output flags will sequentially release, after individual time delays, thus permitting the connected power supplies to start up. The output flags will follow a reverse sequence during power down to avoid latch conditions. Time delays are defined using an external capacitor and the output flag states can be inverted by the user.
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 | LM3881 Simple Power Sequencer With Adjustable Timing 数据表 (Rev. D) | PDF | HTML | 2014-12-10 | ||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 | ||||
| 技术文章 | How to manage processor power during uncontrolled power off | PDF | HTML | 2018-6-21 | |||
| 技术文章 | Sequencing solutions: simple, reliable and cost-effective | PDF | HTML | 2017-9-27 | |||
| 技术文章 | A simple six-channel power-rail sequencing solution | PDF | HTML | 2015-11-16 | |||
| 模拟设计期刊 | 用于 FPGA 的电源排序 | 英语版 | 2014-12-10 | |||
| 应用手册 | Power Supply Design Considerations for Modern FPGAs | 2010-2-2 |
设计与开发
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）。
LM3881EVAL — 用于 LM3881 电源序列发生器的评估板
This evaluation board is designed to permit the designer to connect it directly to the Enable or Remote ON/Off pins of power supply devices of an existing system to facilitate system sequencing. Upon enabling the device, the three open drain output flags will rise in sequential order, 1-2-3. Once (...)
TIDA-010011 — 适用于保护继电器处理器模块的高效电源架构参考设计
TIDA-01466 — 适用于超声波前端的低电压、低噪声电源参考设计
TIDA-01568 — 适用于应用处理器的 12mm x 12mm、5 轨电源时序参考设计
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |