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

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

Product Details

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

Applications/Uses

  • Printers and Scanners
  • Relay Drivers
  • Vending and Gaming Machines
Parametric specs for DC Motor Drivers
Peak Motor Current (A) 2.5
VSUPPLY (V) (min) 4.5
VSUPPLY (V) (max) 36
Total RON (mΩ) (typ) 410
ISUPPLY (mA) (typ) 1
ICC (Shutdown) (µA) (max) 10
Direction Control FWD/REV
Current Regulation Fast
Internal
Internal CR Reference Yes
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/12
Budgetary
Price (See Notes)
$1.58 @1k
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Simplified Block Diagram

MAX14870, MAX14872: Typical Operating Circuit MAX14870, MAX14872: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX14870 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX14870 fullbridge DC motor driver.

The EV kit can also be used to evaluate the MAX14872.

View Details

Features

  • Operates from a Wide 4.5V to 36V Supply
  • Standalone or Software-Controlled Operation
  • Proven PCB Layout
  • Fully Assembled and Tested
  • PMOD Compatible Connector

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Support & Training

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Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Parametric specs for DC Motor Drivers
Peak Motor Current (A) 2.5
VSUPPLY (V) (min) 4.5
VSUPPLY (V) (max) 36
Total RON (mΩ) (typ) 410
ISUPPLY (mA) (typ) 1
ICC (Shutdown) (µA) (max) 10
Direction Control FWD/REV
Current Regulation Fast
Internal
Internal CR Reference Yes
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/12
Budgetary
Price (See Notes)
$1.58 @1k

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

Applications/Uses

  • Printers and Scanners
  • Relay Drivers
  • Vending and Gaming Machines

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 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.

Simplified Block Diagram

MAX14870, MAX14872: Typical Operating Circuit MAX14870, MAX14872: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal