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LMD18245T/NOPB
3A, 55V DMOS Full-Bridge Motor Driver 15-TO-220 -40 to 125
LMD18245
www.ti.com SNVS110E–APRIL 1998–REVISED APRIL 2013
LMD18245 3A, 55V DMOS Full-Bridge Motor Driver
Checkfor Samples: LMD18245
1FEATURES DESCRIPTIONThe LMD18245 full-bridge power amplifier
DMOS Power Stage Ratedat 55V and 3A incorporates all the circuit blocks requiredto drive
Continuous and control currentina brushed type DC motoror
• Low RDS(ON)of Typically 0.3Ω per Power one phaseofa bipolar stepper motor. The multi-
Switch technology process used to build the device
combines bipolar and CMOS control and protection
• Internal Clamp Diodescircuitry with DMOS power switches on the same
• Low-loss Current Sensing Method monolithic structure. The LMD18245 controls the
• Digitalor Analog Controlof Motor Current motor current viaa fixed off-time chopper technique.
TTL and CMOS Compatible Inputs An all DMOS H-bridge power stage delivers
• Thermal Shutdown (Outputs Off)atTJ= 155°C continuous output currents upto 3A (6A peak)at
supply voltages up to 55V. The DMOS power
• Overcurrent Protectionswitches feature low RDS(ON)for high efficiency, anda
• No Shoot-Through Currents diode intrinsicto the DMOS body structure eliminates
• 15-lead Package the discrete diodes typically requiredto clamp bipolar
power stages.
APPLICATIONS An innovative current sensing method eliminates the
• Full, Half and Microstep Stepper Motor Drives power loss associated witha sense resistorin series
with the motor.A four-bit digital-to-analog converter
• Stepper Motor and Brushed DC Motor Servo(DAC) providesa digital path for controlling the motor
Drives current, and, by extension, simplifies implementation
• Automated Factory, Medical and Office of full, half and microstep stepper motor drives. For
Equipment higher resolution applications, an external DAC can used.
