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TMI TMI8870
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TMI TMI8870
- Type
- TMI
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TMI
- Electronic Component
- TMI8870
- Electronic Component
- 1
- Package
- ESOP-8
- Electronic Component
- Brushed DC Motor Driver IC
- Electronic Component
- 0.2g
- Electronic Component
- 1
- Integrated FET
- Electronic Component
- H
- 1
- Features
- Current Sampling
- Electronic Component
- BM0226612911
- Resistor
- 480mΩ
- Current
- 3.6A
- Operating Temperature
- 40℃~+125℃
- Operating Voltage
- 6.8V~45V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
TMI8870 有刷直流电机驱动芯片 产品概述
一、产品简介
TMI8870（拓尔微 TMI）是一款集成功率场效应管的单通道H桥有刷直流电机驱动器，封装为 ESOP‑8（150mil 带外露焊盘）。器件支持宽工作电压 6.8V 至 45V，峰值驱动电流可达 3.6A，适合中小功率有刷直流电机的驱动与控制。器件静态电流极低（Iq ≈ 1μA），适用于需要低待机损耗的电池供电系统。
二、主要规格（关键信息）
- 集成FET：是（内部集成高/低侧功率MOSFET）
- H桥数量：1（单通道）
- 峰值电流：3.6A
- 工作电压范围：6.8V ~ 45V
- 单个FET导通电阻：480mΩ（Rds(on)）
- 静态电流（Iq）：约 1μA
- 工作温度：-40℃ 至 +125℃
- 封装：ESOP‑8（带外露焊盘，便于散热）
三、典型特性与优势
- 宽电压区间覆盖汽车与工业常见电源（12V/24V）和高压应用；
- 内置功率MOSFET，简化外围器件与PCB布线；
- 极低待机电流，适合便携与待机要求高的系统；
- 封装带外露焊盘（EP）利于热量导出和可靠焊接。
四、典型应用场景
- 玩具、家电小型驱动电机；
- 工业执行器、阀门驱动；
- 机器人差速/舵机控制；
- 汽车辅助小电机（符合电压范围时）；
- 电池供电的便携设备与工具。
五、热设计与功耗估算
由于一个导通路径通常包含两个MOSFET，总导通电阻约为 0.48Ω × 2 = 0.96Ω。在峰值电流 3.6A 下，瞬时导通损耗约为 P = I^2·R ≈ 3.6^2 × 0.96 ≈ 12.4W（峰值），因此不建议长期在峰值电流下连续工作。实际系统设计应按照平均电流和占空比计算连续损耗，并采取热扩散措施：使用外露焊盘下沉铜、增加热过孔及较大铜箔面积。
六、设计与布局建议
- 在器件电源及电机供电端使用近端大容量去耦（低ESR电容）以抑制瞬态；
- 在电机端并联TVS或浪涌抑制元件，防止反向尖峰电压；
- 将外露焊盘完整焊接至接地或散热铜区，并使用多孔热通道导出热量；
- 如果需要闭环电流控制，可在输出或电源侧增加电流检测电阻与采样放大电路。
七、注意事项
- 器件规格中的 3.6A 为峰值能力，设计时以热稳定和长期可靠为准；
- 布局时重视高电流回路的短、粗走线以减少附加阻抗与发热；
- 参考器件完整数据手册以获得管脚定义、栅极驱动逻辑及保护特性（如欠压/过温/过流）详细信息。
综上，TMI8870 适合在对体积、成本及外围元件要求较高、同时需要中等峰值驱动能力和低待机损耗的有刷直流电机应用中使用。具体电路实现与可靠性评估请参照厂商完整资料与参考设计。
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