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TMI STI3470
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TMI STI3470
- Type
- TMI
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TMI
- Electronic Component
- STI3470
- Electronic Component
- 1
- Package
- SOT-23-6
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.023g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0226163137
- Operating Temperature
- 40℃~+125℃@(TJ)
- Operating Voltage
- 3.5V~18V
- Switching Frequency
- 600kHz
- Electronic Component
- Electronic Component
- Output Current
- 2A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
STI3470（SOT-23-6）产品概述
一、概述
STI3470 是拓尔微（TMI）推出的一款高集成度降压（Buck）型 DC-DC 开关稳压器，封装为 SOT-23-6。芯片内置功率开关，采用同步整流结构，工作频率为 600kHz，输入电压范围 3.5V 至 18V，最大输出电流 2A，工作结温范围 -40℃ 至 +125℃（TJ）。输出为可调式单通道，适合对体积、效率和成本有综合要求的中低功率电源应用。
二、主要特点
- 输入电压：3.5V ~ 18V
- 输出类型：可调，单路输出
- 拓扑结构：降压型（同步整流）
- 开关频率：600kHz（固定）
- 输出电流：最高可驱动 2A 负载
- 内置开关管：减小外围元件和驱动复杂度
- 工作温度：-40℃ ~ +125℃（TJ）
- 封装：SOT-23-6，体积小，便于空间受限设计
三、典型应用场景
- 工业控制与嵌入式电源
- 通信设备、网关供电
- 便携设备与仪表电源
- 电池供电系统的局部稳压
- 点亮 MCU、传感器、数字芯片的中小功率轨
四、典型应用电路（概念说明）
- 输入端：建议靠近芯片布局低 ESR 陶瓷输入电容（如 4.7µF~47µF）以抑制开关噪声。
- 开关节点（SW）：与外部电感、续流二极管（若需要）或电感引脚连接，布线要短且宽。
- 输出端：建议采用低 ESR 陶瓷或钽电容 22µF~100µF，结合必要的旁路电容以降低输出纹波。
- 反馈网络：通过外部电阻分压设定输出电压，满足 Vout = Vref×(1 + Rtop/Rbottom)（Vref 为芯片内部参考电压，详见数据手册）。
五、外部元件建议（常见范围）
- 电感：为平衡电流纹波与体积，可选 2.2µH～10µH 的功率型电感（2A 电流等级）。
- 输入电容：4.7µF～47µF 陶瓷（X5R/X7R），并加并联 0.1µF 高频旁路。
- 输出电容：22µF～100µF 低 ESR 陶瓷或固态电解以保证稳定性。
- 焊盘与封装：SOT-23-6 引脚间距小，注意留出散热铜箔及接地回流。
六、设计与调试要点
- 布局：将 VIN、GND、SW、输出电容和电感尽可能紧凑排列，缩短高电流回路路径，减小 EMI。
- 热管理：SOT-23-6 封装受限，重载时需在 PCB 加大散热铜箔，确保结温在安全范围内。
- 启动和负载过渡：调试时关注启动上电行为与负载瞬变响应，适当选取补偿与输出滤波元件。
- 保护特性：参考数据手册确认软启动、短路保护、过温保护等功能，以保证系统可靠性。
七、总结
STI3470 在体积小、外设简单、适配广泛输入电压的前提下，提供高集成度的同步降压解决方案，适用于 2A 级别的中低功率电源场合。实际设计时应结合官方数据手册选型外部元件、评估热耗与布局以获得最佳性能与长期可靠性。
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