[原创] Maxim MAX14870 4．5－36V DC有刷马达驱动方案

Maxim公司的MAX14870/MAX14872是业界最小的4.5-36V DC有刷马达驱动器/继电器驱动器,非常低的开态电阻降低了驱动器的功耗,主要用在打印机和扫描仪,继电器驱动器和销售机与游戏机.本文介绍了MAX14870优势和特性,功能框图,以及MAX14870评估板主要特性,框图,电路图,材料清单和PCB设计图.

The MAX14870/MAX14872 motor drivers provide a small, low-power and simple solution for driving and controlling brushed DC motors and relays with voltages between 4.5V and 36V. Very low driver on-resistance reduces power dissipation.

These drivers feature a charge-pump-less design for reduced external components and low supply current. Integrated fast-decay current regulation allows user-adjustable peak startup motor currents and requires mini­mal external components.

A separate voltage-sense input (SNS) reduces current sensing errors due to parasitic trace resistance.

The MAX14870/MAX14872 features shoot-through protec­tion and internal free-wheeling diodes that absorb inductive motor currents. Driver outputs are short-circuit-protected from shorts to ground, to the supply, and between M1 and M2. An active-low FAULT output signals thermal overload and overcurrents during fault conditions.
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