4.5V – 36V full-bridge DC motor driver cuts complexity

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By eeNews Europe

The IC 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 a minimum of external components. It includes three 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. It delivers up to 2.8A peak motor-current, with 334 mΩ (typ) total bridge on-resistance. It uses 1 mA (typ) supply current at 30 kHz and 24V, and 10 µA (max) standby current at 12V. Current regulation only requires a sense resistor.


In the same release are the related MAX14870 and 14872; The MAX14870 has PWM and direction-control inputs, while the MAX14872 has forward and reverse inputs for direction control.


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