Information

Texas Instruments Signal Chain Guide 2013 | 67
Monitoring and Control
Motor Drivers
Get more information: www.ti.com/product/DRV8844
5 A Brushed DC or Quad 1.75 A Solenoid/Relay Driver with Split Rail Support
DRV8844
DRV8844 functional block diagram
The DRV8844 provides four individually controllable 1/2-H-bridge drivers. It can be
used to drive two DC motors, one stepper motor, four solenoids, or other loads. It
supports both high side or low side switching when driving solenoids with the non-
switching FET acting as the catch diode. The output driver channel for each channel
consists of N-channel power MOSFET’s configured in a 1/2-H-bridge configuration. The
DRV8844 can supply up to 2.5-A peak or 1.75-A RMS output current per channel (with
proper PCB heatsinking at 24 V and 25°C) per H-bridge. Separate inputs to indepen
-
dently control each 1/2-H-bridge are provided. To allow operation with split supplies,
the logic inputs and nF
AULT output are referenced to a separate floating ground pin.
Internal shutdown functions/protection is provided for over-current, short circuit, under-
voltage lockout and over-temperature events.
Key Features
• QuadhalfH-Bridgemotordriverwith
8 to 60 V supply voltage
•
±30Vsplit-railsupportwithfloating
“control” inputs
•
Upto1.75Acontinuous/2.5Apeak
output current per half bridge
•
PWMcontrolinterfacewith
independent enables
•
480mΩR
DS(ON)
(HS + LS) improves
thermal performance
•
On-chip3.3VLDO(10mA)
• Integratedprotectionfeatures
including over-current, thermal,
shoot-through, and UVLO protection
Applications
• Textilemachines
• Factoryautomation
• Robotics
• Solenoid/Relaydrivers
PWM Input
(4x pins)
Enable
(4x pins)
Logic GND
Controller
Fault
-30 V
+30 V
DRV8844
4 x 1.75 A
10 mA LDO
Solenoid
Solenoid
Solenoid
Solenoid