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TMI STI3411A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TMI STI3411A
- Type
- TMI
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TMI
- Electronic Component
- STI3411A
- Electronic Component
- 1
- Package
- SOT-23-5
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.049g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0258344301
- Operating Temperature
- 40℃~+85℃@(TA)
- Operating Voltage
- 2.5V~6V
- Switching Frequency
- 1MHz
- Electronic Component
- Electronic Component
- Output Voltage
- 600mV~6V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
STI3411A 产品概述
STI3411A 是拓尔微（TMI）推出的一款降压型同步整流 DC-DC 转换器，采用 SOT-23-5 封装，面向空间受限且对效率与电流要求较高的便携式和电池供电产品。芯片支持 2A 输出电流，内置开关管，工作频率 1MHz，静态电流仅 40µA，适合需要低待机功耗与快速瞬态响应的场合。
一、主要规格
- 功能类型：降压型（Buck）
- 输入电压范围：2.5V ～ 6V
- 输出电压范围：0.6V ～ 6V（可调）
- 最大输出电流：2A
- 开关频率：1MHz（典型）
- 同步整流：是（内置下管）
- 静态电流（Iq）：40µA
- 工作温度：-40℃ ～ +85℃（TA）
- 通道数：单通道
- 封装：SOT-23-5
二、典型应用场景
- 移动电源、便携终端与可穿戴设备
- 电池管理与降压供电（锂电池、两节锂电组）
- 物联网节点、无线通信模块电源
- 工业控制与传感器前端低压轨供电
三、功能与优势
STI3411A 采用降压拓扑并集成高/低侧开关管，减少外部元件数量，简化系统设计。工作频率高达 1MHz，可显著减小电感和输出电容体积，利于小型化方案。同步整流提高轻载与重载效率，40µA 的低静态电流有利于延长电池工作时间。
四、设计与选型建议
- 电感：选型电流额定值应 ≥ 2A（建议留 20% 余量），电感量常见在 0.7µH–2.2µH 区间，根据输出电流与允许纹波电流调整。
- 输入/输出电容：优先采用低 ESR 的陶瓷电容（X5R/X7R），输入侧靠芯片放置一个 4.7µF–22µF，输出侧根据纹波要求并联 10µF–47µF。
- 分压电阻：利用芯片 0.6V 参考（基准）设置输出电压，选用低温漂精密电阻以保证输出精度。
- 布局：缩短开关节点（SW）、输入电容与芯片之间的回路，输入电容尽量靠近 VIN 与 GND 引脚放置，输出回路注意散热通道与热量均匀释放。
五、封装与热管理
SOT-23-5 小封装带来空间优势，但散热能力有限。高电流工作时需注意 PCB 铜箔面积与散热路径，必要时在 VIN/GND 区域增加散热墩或加大铜箔面积以降低结温并防止热降额。
六、调试与注意事项
- 首次上电建议使用限流电源慢速提升输入，观察输出稳定性与热升。
- 若系统需快速启停或软启动，请参考 datasheet 提供的使能/启动（若芯片带有 EN/SHUTDOWN）规范，避免输出冲击。
- 对于需高效率的轻载工况，可评估同步整流与强制 PWM 之间的模式切换（若芯片支持），并根据实际负载优化电感与开关频率。
总结：STI3411A 以其宽输入范围、可调输出、2A 输出能力与 1MHz 高频率，适合体积受限且要求高效能、低静态功耗的电源设计。合理的外部元件选型与良好 PCB 布局是发挥其性能的关键。
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