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LP3992-33B5F 是 LOWPOWER(微源半导体)推出的一款固定输出 3.3V 线性稳压器(LDO),单通道正极输出,采用 SOT-23-5 小封装设计。器件面向对噪声、纹波抑制和低压差有要求的便携与嵌入式系统,提供高达 300mA 的输出能力,同时保持低静态电流,适合电池供电和低功耗应用。
器件额定工作温度范围为 -40℃ 到 +125℃(Tj)。推荐输入电压需高于输出电压加上稳压器的压差裕量,器件标称工作电压上限为 5.5V,请确保输入端在此范围内工作。使能引脚用于关闭或唤醒稳压器,关断时可进一步降低系统静态功耗(关断电流请参考数据手册)。过流与热关断功能在异常负载或短路情况下提供保护,避免器件损坏。
SOT-23-5 封装尺寸紧凑,内部含热关断设计,但在高功耗工况(高 Vin 与高 Iout)下应关注功耗与结温。采用足够的 PCB 散热铜箔、缩短热阻路径并避免紧邻高热源元件可降低结温。过流限制特性在持续高负载时可能导致输出电压自动降低以保护芯片,应在系统设计中留出电流裕量。
为保证稳压器稳定与瞬态响应,建议在输入端与输出端各放置低 ESR 陶瓷去耦电容(常用 1µF~10µF),输入端也可并联滤波电容以降低源阻与纹波。布线应尽量短且粗,输入/输出地线共回流路径要集中到稳压器地引脚,减少地弹降对输出精度和噪声的影响。使能引脚应与 MCU 或控制逻辑直接连接,以实现电源管理策略。
封装:SOT-23-5,适合空间受限的 PCB 布局与自动贴片生产。型号:LP3992-33B5F,品牌:LOWPOWER(微源半导体)。如需设计文件、完整电气特性曲线及推荐外部元件值,请参考厂家数据手册或联系厂商技术支持获取详细资料。
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