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MAX14871：4.5V to 36V Full-Bridge DC Motor Driver

Industry’s Simplest and Most Flexible 4.5 to 36V DC-Brushed Motor Driver

The MAX14871 DC motor driver provides a low-power and simple solution for driving and controlling brushed motors with voltages between 4.5V and 36V. Very low driver on resistance reduces power during dissipation. The MAX14871 features a charge-pump-less design for reduced external components and low supply current. Integrated current regulation allows user-defined peak startup motor currents and requires minimal external components. The MAX14871 includes 3 modes of current regulation: fast decay, slow decay, and 25% current ripple modes. Current regulation based on 25% ripple simplifies the design and enables regulation independent of motor characteristics. A separate voltage sense input (SNS) reduces current-sensing errors due to parasitic trace resistance. The MAX14871 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. The MAX14871 is available in a 16-pin TSSOP-EP package and operates over the -40°C to +85°C temperature range.

关键特性 Drive More Power and Reduce Footprint Up to 2.8A Peak Motor-Current Package Flexible 4.5V–36V Supply Enables Longer Runtime Low Power Consumption Runs Cooler and Longer 334mΩ (typ) Total Bridge On-Resistance 1mA (typ) Supply Current at 30kHz/24V 10µA (max) Standby Current at 12V Simplified Designs Reduces Time to Market Charge-Pump-Less Architecture Current Regulation Only Requires a Sense Resistor Current-Sense Input Simplifies PCB Layout Internal/External VREF for Current Regulation Fast/Slow/25% Ripple Current Regulation Modes Integrated Protection Provides Robust Driving Solutions Short-Circuit-Protected Drivers Thermal Shutdown Undervoltage Lockout Diagnostic Active-Low FAULT Output -40°C to +85°C Temperature Range

MAX14871: Typical Operating Circuit 应用 工业自动化 打印机与扫描仪

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