4.5V to 36V Full-Bridge DC 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.

Applications

* Industrial Automation * Printers and Scanners * Vending and Gaming Machines

* 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