WMSIC Electronic Components

TMI TMI3408D

ModelTMI3408D
PackageDFN-6-EP(2x2)
BrandTMI
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 25+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
TMI TMI3408D
Type
TMI
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
TMI
Electronic Component
TMI3408D
Electronic Component
1
Package
DFN-6-EP(2x2)
Electronic Component
DC-DC Power Supply IC
Electronic Component
0.018g
Electronic Component
1
Type
Electronic Component
Synchronous
Electronic Component
Electronic Component
BM0259364233
Operating Temperature
40℃~+125℃@(TJ)
Operating Voltage
2.5V~5.5V
Switching Frequency
1.5MHz
Electronic Component
Electronic Component
Output Voltage
600mV~5.5V

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

TMI3408D 降压型同步整流稳压器概述

一、产品简介

TMI3408D 是拓尔微(TMI)推出的一款降压型同步整流开关稳压器,适用于 2.5V ~ 5.5V 输入电压范围,提供最高 1.2A 连续输出电流。芯片内置开关管,开关频率 1.5MHz,支持可调输出,工作结温范围为 -40℃ 到 +125℃,静态电流仅 40µA,封装为 DFN-6-EP(2×2)。高频工作和低静态电流使其适合空间受限且对功耗敏感的便携式与电池供电应用。

二、主要特性

  • 降压拓扑,单输出通道,输出可调;
  • 输入电压:2.5V ~ 5.5V;输出电流:最大 1.2A;
  • 同步整流结构,提高导通效率,减少外部肖特基二极管需求;
  • 开关频率 1.5MHz,利于减小外部电感和电容体积;
  • 低静态电流 Iq = 40µA,适合待机功耗严格的系统;
  • 内置高、低侧开关管,简化外部器件;
  • 小尺寸 DFN-6-EP(2×2)封装,带底部散热焊盘,便于 PCB 热管理。

三、外部器件选择建议

  • 电感:由于工作频率较高,建议选用低 DCR、饱和电流高于 1.2A 的功率电感。典型电感量可在 0.47µH–2.2µH 范围内选择,按占空比和纹波电流权衡尺寸与效率。
  • 输入/输出电容:推荐使用 X7R/Z5U 低 ESR MLCC。输入端常用 4.7µF–10µF,输出端 10µF–22µF 为常见组合,具体容量与 ESR 配合以控制输出纹波与瞬态响应。
  • PCB 布局:输入电容应尽量靠近芯片 VIN 和 GND 引脚,功率回流路径短且平整,避免长环路。

四、散热与封装注意

DFN-6-EP(2×2)带有外露焊盘(EP),该焊盘是散热主通道。推荐多孔铜通过(vias)将底部焊盘连到内层或背面大铜箔,增大散热面积。在靠近最大负载运行或高环境温度时,应评估结-环境温升并采取合适散热措施,确保芯片工作结温低于 125℃。

五、典型应用场景

  • 便携式设备与便携仪表:电池供电场合对低静态电流和体积有严格要求;
  • 物联网终端、传感器节点:要求长待机、间歇性工作、高能效;
  • 消费类电子小型电源:如蓝牙音箱、USB 外围设备等;
  • 单节锂电池供电的降压稳压解决方案。

六、实用建议与注意事项

  • 版图优化:保持开关节点(SW)到电感的走线最短最宽,输入回路环路最小化;
  • 噪声与纹波控制:输出电容并联少量较高 ESR 的钽/固态电容可改善瞬态响应,但需评估效率与发热;
  • 可靠性验证:在预期的最恶劣温度与负载条件下进行热验证与长期可靠性测试;
  • 参考资料:使用器件时应参考厂商原理图和推荐布局,按典型应用参考设计调试输出电感与电容参数。

结论:TMI3408D 以其高开关频率、同步整流与低静态电流的组合,在空间与功耗受限的便携与物联网应用中具有明显优势。合理选择外部器件并做好 PCB 热与布局设计,能最大化其性能表现。

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