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TMI TMI3359
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TMI TMI3359
- Type
- TMI
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TMI
- Electronic Component
- TMI3359
- Electronic Component
- 1
- Package
- SOT-23-6
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.045g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0226613085
- Operating Temperature
- 40℃~+125℃@(TJ)
- Operating Voltage
- 4.5V~30V
- Switching Frequency
- 1.5MHz
- Electronic Component
- Electronic Component
- Output Current
- 1.2A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
TMI3359 可调降压型同步整流 DC-DC 电源芯片（SOT-23-6）产品概述
一、产品简介
TMI3359 是拓尔微（TMI）推出的一款单通道可调输出降压型开关稳压器，封装为 SOT-23-6。芯片集成同步整流开关管，支持 4.5V 至 30V 宽输入电压，最大输出电流 1.2A，内部开关频率为 1.5MHz，静态电流仅 350µA，工作结温范围 -40℃ 至 +125℃（TJ）。该器件适用于要求体积小、效率高、待机电流低的电源转换场合。
二、主要特性
- 可调输出：通过外部分压电阻设定输出电压，灵活适配多种点负载电压需求。
- 同步整流：内置同步 MOSFET，降低导通损耗，提高中高负载效率，无需外接肖特基二极管。
- 高频工作：1.5MHz 开关频率，允许使用小尺寸电感与陶瓷电容，利于小型化布局。
- 低静态电流：IQ≈350µA，适合电池供电及低功耗待机场景。
- 宽输入与高温稳定：4.5V–30V 输入范围，适配工业与车载周边（需评估车规要求）；TJ 工作至 +125℃。
三、典型应用
- 工业控制与自动化模块的点位电源
- 车载辅助电源（需按车规与瞬态保护设计）
- 通信与物联网终端的局部降压（PMIC）
- 消费类便携设备与小型嵌入式系统电源
四、设计要点与建议
- 外围器件：
- 电感：建议选择 0.47µH–2.2µH 范围，电流额定值 ≥ 1.5×输出电流以保证裕量；实际取值依输出电压、纹波与效率权衡。
- 输入电容：使用低 ESR 陶瓷电容（例如 10µF~47µF），靠近 VIN 引脚布置以抑制输入电流尖峰。
- 输出电容：低 ESR MLCC，容量常见 10µF~47µF，必要时并联少量钽电容以改善负载瞬变。
- 反馈网络：按数据手册给定的参考电压设计分压比，实现期望输出电压与稳定环路相位裕度。
- 布局与走线：
- VIN、GND、开关节点（SW）与输入/输出电容走线最短并成闭环，减小寄生电感和辐射。
- 将输入电容靠近 VIN 和 GND 引脚放置，开关节点远离敏感模拟线。
- SOT-23-6 封装热散能力有限，若功耗较大建议增加铜面积做散热并优化底层铜皮。
- 热与可靠性：
- 在高输入差与高输出电流工况下，芯片功耗与结温显著上升，应进行热仿真并留裕量。
- 在车载或工业环境，需配合瞬态抑制与滤波，防止输入浪涌损伤器件。
五、优势总结
TMI3359 在小封装下提供同步整流、高频率与低静态电流的组合，适合对体积和能效有较高要求的点位降压场景。设计中合理选择外部电感与电容并优化 PCB 布局，可获得良好的稳态效率与动态响应。
如需进一步电气参数（参考电压、引脚功能、典型效率曲线与 PCB 参考设计），建议参考 TMI 官方数据手册与典型应用电路。
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