MAX14870:Compact 4.5V to 36V Full-Bridge DC Motor Drivers

Industry’s Smallest 4.5V–36V DC Brushed Motor Drivers/Relay Drivers

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.

Key Features
  • 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
    • 280mΩ (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
MAX14870, MAX14872: Typical Operating Circuit
MAX14870, MAX14872: Typical Operating Circuit
  • Printers and Scanners
  • Relay Drivers
  • Vending and Gaming Machines
titleDownload file
MAX14870-MAX14872 Data SheetMAX14870-MAX14872.pdf
Part NumberPeak Motor Current
Total RON
ICC (Shutdown)
Direction ControlCurrent RegulationInternal CR ReferenceOper. Temp.
minmaxtyptypmaxSee Notes
Yes-40 to +85TDFN/12$1.50 @1k
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX14870ETC+TActiveTDFN,;12 pin;9.6 mm²-40°C to +85°CLead Free