MAX14871 Full-Bridge DC Motor Driver Evaluation Kit

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.

• 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

• 334mO (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 V_REF 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