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LOWPOWER LP3981-33B5F
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- LOWPOWER LP3981-33B5F
- Type
- LOWPOWER
- Minimum package
- 3000 未知
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 300mV@(300mA)
- Electronic Component
- LOWPOWER
- Electronic Component
- 100uVrms
- Electronic Component
- LP3981-33B5F
- Electronic Component
- 1
- Package
- SOT-23-5
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.049g
- Electronic Component
- 1
- Features
- Output
- Electronic Component
- BM0229943299
- Operating Temperature
- 40℃~+125℃@(Tj)
- Operating Voltage
- 6.5V
- Output
- Electronic Component
- Output Voltage
- 3.3V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LP3981-33B5F 产品概述
一、概述
LP3981-33B5F 是 LOWPOWER（微源半导体）推出的一款低压差、低功耗、固定输出 3.3V 的线性稳压器。器件为单通道正极输出，工作电压最高可达 6.5V，最大输出电流 300mA。SOT-23-5 小封装设计，适合空间受限的便携与嵌入式应用，集成过流保护与热关断功能以提高系统可靠性。
二、主要参数
- 输出类型：固定（3.3V）
- 工作电压（Vin）：6.5V（器件允许的最高工作电压）
- 输出电压：3.3V
- 最大输出电流：300mA
- 压差（Dropout）：300mV @ 300mA
- 静态电流（Iq）：120µA
- 电源纹波抑制比（PSRR）：76dB @ 1kHz
- 输出噪声：100µVrms
- 保护特性：过流保护（OCP）、热关断
- 工作结温：-40℃ ~ +125℃ @(Tj)
- 封装：SOT-23-5，单通道，正极输出
三、主要特性与优势
- 低压差：300mV@300mA 的压差有利于在较低输入-输出电压差条件下保持稳定输出，适合 3.7V 锂电池或 5V 供电降压到 3.3V 的场景。
- 低静态电流：120µA 的静态电流有助于延长电池供电设备的待机时间。
- 高 PSRR 与低噪声：76dB@1kHz 的抑制比与 100µVrms 的噪声性能使其适合对电源质量有一定要求的 RF、传感器与 ADC 前端应用。
- 保护完备：内置过流与热关断，提高短路与过载情况下的系统安全性。
四、典型应用场景
适用于电池供电与低功耗场景，如物联网终端、便携式仪表、穿戴设备、无线模块、传感器前端与 MCU 供电等。
五、热管理与 PCB 布局建议
- 功耗估算示例：Pd = (Vin - Vout) × Iout。若 Vin=5.0V、Vout=3.3V、Iout=300mA，则 Pd ≈ 0.51W，需关注封装的热阻及散热。
- 在 SOT-23-5 小封装下推荐在器件四周增加铜皮并形成散热岛，视需要加多层铜层并通过热盲孔或过孔导热至内层/底层。
- 输入端与输出端滤波电容应靠近器件引脚布置，使用低 ESR 陶瓷电容可以改善瞬态响应与降低噪声（具体电容值参考系统要求和器件数据手册）。
六、使用注意事项
- 确认最高工作电压与实际系统最大输入电压匹配，避免反向或过压。
- 在高电流工作时注意器件结温，避免持续在热关断区域工作以免影响可靠性。
- 根据系统对启动模式、上电顺序及纹波容忍度选配合适的输入/输出滤波网络。
- 建议参考 LOWPOWER 官方数据手册获取引脚定义、电气特性曲线和参考电路，以完成最优化设计。
LP3981-33B5F 以其低压差、低静态电流与良好的噪声与 PSRR 性能，为中低功耗 3.3V 供电设计提供了实用且可靠的选择。
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