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LOWPOWER LP3986-18B3F
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- LOWPOWER LP3986-18B3F
- Type
- LOWPOWER
- Minimum package
- 3000 编带
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 220mV@(300mA)
- Electronic Component
- LOWPOWER
- Electronic Component
- LP3986-18B3F
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.017g
- Electronic Component
- 1
- Electronic Component
- BM0228979654
- Operating Temperature
- 40℃~+85℃@(Ta)
- Operating Voltage
- 6V
- Output
- Electronic Component
- Output Voltage
- 1.8V
- Output Current
- 300mA
- Output Type
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LP3986-18B3F 产品概述
一、产品简介
LP3986-18B3F 是 LOWPOWER（微源半导体）推出的一款固定输出线性稳压器（LDO），输出电压为 1.8V（型号后缀“18”表示固定 1.8V 输出）。该器件采用 SOT-23 小封装，面向对噪声、纹波和瞬态性能有较高要求的便携式与嵌入式应用。器件集成热关断与过流保护，适合单路正向稳压供电场合。
二、主要规格亮点
- 输入工作电压：最高可达 6V（典型在各种单节电池或多数电源轨可用范围内）
- 输出电压：固定 1.8V
- 输出电流：最高 300mA（连续条件下应考虑封装功耗限制）
- 压降（Dropout）：220mV @ 300mA，属于低压差 LDO，适合电压差较小的降压场景
- PSRR：65dB @ 10kHz，良好的电源纹波抑制能力，有利于模拟与 RF 前端供电
- 保护特性：内部热关断与过流保护，提高系统可靠性
- 工作温度：-40℃ ~ +85℃（Ta），适用于工业级温度区间
三、典型应用场景
适用于智能终端与便携设备、传感器模组、微控制器与数字逻辑供电、模拟前端与射频电路偏置等场景。尤其在输入输出电压差较小且希望简化外围电路（无需外接开关器件）时，LP3986-18B3F 提供了简单可靠的线性供电方案。
四、设计要点与注意事项
- 散热与功耗计算：线性稳压器的功耗等于 (Vin - Vout) × Iout。举例：若 Vin=6V、Vout=1.8V、Iout=300mA，则器件耗散约 1.26W。SOT-23 封装散热能力有限，高功耗时可能触发热关断，应通过减小 Vin、降低输出电流或增强 PCB 散热（加大铜箔面积、尽量使用多层过孔散热）来控制结温。
- 输入/输出电容：为保证稳压器稳定与良好的瞬态响应，建议在 VIN 和 VOUT 端各放置低 ESR 陶瓷电容（常见 1µF ~ 10µF），并尽量靠近器件引脚布局，缩短回流路径。参考典型布局可降低振荡风险并改善 PSRR 性能。
- 布局建议：将输入电容靠近 VIN 引脚，输出电容靠近 VOUT 与 GND 引脚，GND 平面尽量连续，避免细长回流通路；热流可通过 PCB 铜箔扩展以提升散热。
- 保护与可靠性：器件内置热关断与过流保护，但仍需根据系统场景评估启动电流与瞬态峰值，以避免频繁触发保护影响系统稳定性。
五、总结
LP3986-18B3F 以其低压差（220mV@300mA）、良好 PSRR（65dB@10kHz）和完整保护功能，适合对噪声、纹波敏感且需要紧凑封装的小电流至中等电流供电场景。设计时需重视热管理与输入电压选择，合理配置输入/输出电容和 PCB 散热方案，便可在便携设备与工业嵌入式系统中实现稳定可靠的 1.8V 供电。
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