MAX14871_14 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 4.5V to 36V Full-Bridge DC Motor Driver

MAX14871
EVALUATION KIT AVAILABLE
4.5V to 36V Full-Bridge DC Motor Driver
General Description
The MAX14871 DC motor driver provides a low-power
and simple solution for driving and controlling brushed
motors with voltages between 4.5V and 36V. Very low
driver on resistance reduces power during dissipation.
The MAX14871 features a charge-pump-less design for
reduced external components and low supply current.
Integrated current regulation allows user-defined peak startup
motor currents and requires minimal external components.
The MAX14871 includes 3 modes of current regulation:
fast decay, slow decay, and 25% current ripple modes.
Current regulation based on 25% ripple simplifies the
design and enables regulation independent of motor
characteristics. A separate voltage sense input (SNS) reduc-
es current-sensing errors due to parasitic trace resistance.
The MAX14871 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 MAX14871 is available in a 16-pin TSSOP-EP package
and operates over the -40°C to +85°C temperature range.
Applications
●● Printers and Scanners
●● Industrial Automation
●● Vending and Gaming Machines
Typical Application Circuit
Benefits and Features
●● Drive More Power and Reduce Footprint
• Up to 2.8A Peak Motor-Current Package
• Flexible 4.5V–36V Supply Enables Longer Runtime
●● Low Power Consumption Runs Cooler and Longer
• 334mΩ (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
• Internal/External V_REF for Current Regulation
• Fast/Slow/25% Ripple Current Regulation Modes
●● Integrated Protection Provides Robust Driving Solutions
• Short-Circuit-Protected Drivers
• Thermal Shutdown Undervoltage Lockout
• Diagnostic FAULT Output
• -40°C to +85°C Temperature Range
Ordering Information appears at end of data sheet.
24V
M
3.3V
3.3V
VDD
M1
IRQ
µC ^GPO
PWM
FAULT
DIR
PWM
EN
3.3V
VREF
TCOFF
COFF
MODE
VDD
DRIVER
CURRENT
REGULATION
SNS
M2
MAX14871
VDD
DRIVER
COM
GND
RSENSE
19-7063; Rev 0; 9/14