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TMI TMI3255
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TMI TMI3255
- Type
- TMI
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TMI
- Electronic Component
- TMI3255
- Electronic Component
- 1
- Package
- DFN-6(2x2)
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.163g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0227307354
- Operating Temperature
- 40℃~+125℃@(TJ)
- Operating Voltage
- 4.5V~18V
- Switching Frequency
- 450kHz~750kHz
- Electronic Component
- Electronic Component
- Output Current
- 5A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
TMI3255 产品概述
一、主要特性
TMI3255 是一款降压型同步整流开关稳压器，适用于输入电压 4.5V 至 18V 的单节至多节电源系统。核心参数包括：输出电流最高 5A、开关频率 450kHz~750kHz、静态电流（Iq）约 600µA、工作结温 -40℃ ~ +125℃（TJ）。器件为单通道可调输出，内置开关管，封装为 DFN-6（2x2），适合紧凑布局与散热设计。
二、功能与优势
- 同步整流：内置同步整流器件，在中高负载时能显著降低整流损耗、提升转换效率。
- 宽输入范围：4.5V~18V 输入覆盖常见 USB、锂电、24V 与汽车辅助电源（设计时注意瞬态抑制与认证要求）。
- 高开关频率：450kHz~750kHz 允许使用更小的电感和输出电容，有利于体积与响应性能平衡，但需权衡效率与 EMI。
- 低静态电流：600µA 静态电流适合轻负载和待机省电设计。
- 小封装、内置功率管：DFN-6(2x2) + 内置开关，简化 PCB 布局与外部元件数量。
三、典型应用
- 工业控制与通信电源模块
- 车载电子（需配合车用瞬态抑制与认证）
- 消费电子与便携设备的点对点降压
- IoT、网关、路由器等需 5A 级稳压的电源前端
四、封装与 PCB 布局建议
- 将热焊盘打大并焊接多盏通孔（via）直到内部散热层，保证热量通过底铜散出。
- VIN 与 GND 的输入电容紧贴器件引脚放置，减小回流环路面积；开关节点（SW）走线尽可能短且宽。
- 输出电容选用低 ESR 电解/固态或多颗并联陶瓷，靠近 VOUT 引脚布置以保证瞬态与稳定性。
- 对电感选型，建议使电感电流纹波占额定电流的 20%~40%，可用近似公式估算：L = (Vout*(Vin−Vout)) / (Vin * fs * ΔI)，其中 fs 取器件工作频率，ΔI 为目标纹波电流。
五、设计注意事项
- 版图热管理与器件散热能力直接影响长期可靠性，高电流场合需做好散热设计及必要降额。
- 若关注 EMI，建议在输入侧增加小电阻或 RC 滤波，并优化开关边缘与地平面。
- 对输出环路补偿与稳定性需在目标输出电容与负载范围内验证，必要时调整补偿网络或增加并联电容。
- 在汽车或恶劣电源环境下，应配合 TVS、滤波与缓启动电路以应对瞬态与浪涌。
总结：TMI3255 集成度高、适合空间受限且需 5A 输出的降压场合。合理的元件选型与 PCB 布局、良好的散热与 EMI 设计，能最大化该器件在效率、稳定性和可靠性方面的表现。
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