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TMI TMI3281
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TMI TMI3281
- Type
- TMI
- Minimum package
- 3000 编带
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TMI
- Electronic Component
- TMI3281
- Electronic Component
- 1
- Package
- SOT-23-6
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.049g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0230639318
- Operating Temperature
- 40℃~+125℃@(TJ)
- Operating Voltage
- 3.5V~18V
- Switching Frequency
- 1MHz
- 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.
TMI3281 产品概述
一、简介
TMI3281 是拓尔微（TMI）推出的一款降压型同步开关稳压器，采用降压拓扑、内置开关管，适用于单路可调输出场合。器件工作电压范围为 3.5V 至 18V，开关频率高达 1MHz，最大输出电流 2A，工作结温范围 -40℃~+125℃，静态电流仅 600µA，适合空间受限且对效率和静耗都有要求的应用。
二、主要规格特点
- 功能类型：降压（Buck），单通道可调输出
- 输入电压：3.5V ～ 18V
- 输出电流：最高 2A（连续）
- 开关频率：1MHz（典型）
- 同步整流：内置同步整流，提高轻载效率
- 静态电流 Iq：600µA（典型）
- 开关管：内置式，简化外部功率器件选择
- 封装：SOT-23-6，适合小尺寸 PCB 设计
- 工作温度：-40℃ ～ +125℃（TJ）
三、典型应用
- 便携式设备与移动电源管理（3.7V~12V 输入场景）
- 工业控制与通信设备的本地电源降压
- 嵌入式系统、单板电路的 5V/3.3V/可调电源
- LED 驱动与传感器供电（需注意电流与散热）
四、封装与热管理
SOT-23-6 小体积封装利于高密度布局，但散热能力受限。建议在 PCB 下方增加散热铜箔与过孔，将热量传导至内层或底层大面积地，加大散热铜箔面积以保证在 2A 输出和高输入电压时器件温升可控。
五、设计要点与布局建议
- 输入旁路：VIN 与 GND 之间靠近器件放置低 ESR 陶瓷电容（如 10µF~22µF），抑制开关噪声。
- 输出电容：采用低 ESR 电解/钽或陶瓷组合，保证瞬态响应和稳定性。
- 电感选择：选用额定电流高于 2A、低 DCR 的功率电感，以降低损耗和温升。
- 反馈设定：通过外部分压电阻设定输出电压，注意反馈网络靠近 FB 引脚布线。
- 布局：SW 回路（开关管、二极管/同步 FET、电感、电容）尽量短且紧凑，地线采用多点或铺地铜，敏感信号远离开关节点。
六、典型外部电路建议
常见拓扑为 VIN → VIN 引脚 → 内置开关 → SW 引脚 → 电感 → 输出，VOUT 经分压送回 FB 引脚以实现可调输出。典型外部元件：输入 1022µF 低 ESR 电容、输出 22100µF（根据纹波与瞬态要求选择）、电感根据输出电流与纹波目标选型、两只反馈电阻设定所需输出电压。实际设计请参考厂方评估板和推荐元件表进行参数优化。
如需进一步的电气参数（效率曲线、软起动、保护功能、引脚描述及参考电路图），建议索取 TMI 官方数据手册与评估板资料以便完成量产级设计。
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