MAX14870 Compact Full-Bridge DC Motor Driver Evaluation Kit

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. The MAX14870 has PWM and direction-control inputs, while the MAX14872 has forward and reverse inputs for direction control. See the Function Tables in the data sheet. The MAX14870 and MAX14872 are available in a 12-pin (3mm x 3mm) TDFN-EP package and operate over the -40°C to +85°C temperature range.

• Small Package Handles High Power and Reduces Footprint Circuit Size
  • Up to 2.5A Peak Motor Current
  • Space-Saving TDFN-EP (3mm x 3mm) Package
  • Flexible 4.5V-36V Supply Enables Longer Runtime on Batteries

Low Power Consumption Runs Cooler and Longer

• 280mO (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

Integrated Protection Provides Robust Driving Solution

• Short-Circuit-Protected Drivers
• Thermal-Shutdown Undervoltage Lockout
• Diagnostic Active-Low FAULT Output
• -40°C to +85°C Temperature Range