General Description

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 mini-

mal external components.

A separate voltage-sense input (SNS) reduces current

sensing errors due to parasitic trace resistance.

The MAX14870/MAX14872 features shoot-through protec-

tion 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.

The MAX14870/MAX14872 are available in a 12-pin

(3mm x 3mm) TDFN-EP package and operate over the

-40°C to +85°C temperature range.

Benefits and 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

• 280mW (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 FAULT Output

• -40°C to +85°C Temperature Range

Applications

● Printers and Scanners

● Relay Drivers

● Vending and Gaming Machines

Ordering Information appears at end of data sheet.

19-7062; Rev 0; 9/14

DRIVER

SNS

MAX14870

MAX14872

GND

COM

M1

M2

EN

FAULT

DRIVER

CURRENT

REGULATION

µC

IRQ

PWM

GPO

24V

3.3V

3.3V

M

+ THESE PIN NAMES ARE FOR THE MAX14870. ON THE MAX14872, THESE ARE THE FWD AND REV INPUTS.

Typical Application Circuit

MAX14870/MAX14872

Compact 4.5V to 36V

Full-Bridge DC Motor Drivers

EVALUATION KIT AVAILABLE