MAX14870 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Full-Bridge DC Motor Drivers

MAX14870/MAX14872
EVALUATION KIT AVAILABLE
Compact 4.5V to 36V
Full-Bridge DC Motor Drivers
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.
Typical Application Circuit
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.
3.3V
3.3V
IRQ
µC _GPO
PWM
FAULT
DIR⁺
PWM⁺
EN
24V
M
VDD
M1
VDD
DRIVER
M2
MAX14870
MAX14872
VDD
DRIVER
CURRENT
REGULATION
SNS
COM
GND
RSENSE
+ THESE PIN NAMES ARE FOR THE MAX14870. ON THE MAX14872, THESE ARE THE FWD AND REV INPUTS.
19-7062; Rev 0; 9/14