MAX14870 DC Motor Driver

By Maxim Integrated 109

MAX14870 DC Motor Driver

Maxim Integrated's MAX14870 motor driver provides a small, low-power and simple solution for driving and controlling brushed DC motors and relays with voltages between 4.5 V and 36 V. Very low driver on-resistance reduces power dissipation.

The driver features 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 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. See the Function Tables in the data sheet.

The MAX14870 is available in a 12-pin (3 mm x 3 mm) TDFN-EP package and operate over the -40°C to 85°C temperature range.

Features
  • Small package handles high power and reduces footprint circuit size
    • Up to 2.5 A peak motor current
    • Space-saving TDFN-EP (3 mm x 3 mm) package
    • Flexible 4.5 V to 36 V supply enables longer runtime on batteries 
  • Low power consumption runs cooler and longer
    • 280 mΩ (typ) total bridge on-resistance
    • 1 mA (typ) supply current at 30 kHz/24 V
    • 1 0µA (max) standby current at 12 V

  • Simplified design 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

New Products:

MAX14870ETC+T

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