IC LMD18245T

LMD18245 3A, 55V DMOS Full-Bridge Motor Driver

DESCRIPTION
The LMD18245 full-bridge power amplifier 2• DMOS Power Stage Rated at 55V and 3A
incorporates all the circuit blocks required to drive Continuous
and control current in a brushed type DC motor or
• Low RDS(ON) of Typically 0.3Ω per Power one phase of a bipolar stepper motor. The multi-
Switch technology process used to build the device
• Internal Clamp Diodes combines bipolar and CMOS control and protection
circuitry with DMOS power switches on the same • Low-loss Current Sensing Method monolithic structure. The LMD18245 controls the
• Digital or Analog Control of Motor Current motor current via a fixed off-time chopper technique.
• TTL and CMOS Compatible Inputs An all DMOS H-bridge power stage delivers
• Thermal Shutdown (Outputs Off) at TJ = 155°C continuous output currents up to 3A (6A peak) at
• Overcurrent Protection supply voltages up to 55V. The DMOS power
switches feature low RDS(ON) for high efficiency, and a • No Shoot-Through Currents diode intrinsic to the DMOS body structure eliminates
• 15-lead Package the discrete diodes typically required to clamp bipolar
power stages.
APPLICATIONS
An innovative current sensing method eliminates the
• Full, Half and Microstep Stepper Motor Drives power loss associated with a sense resistor in series
• Stepper Motor and Brushed DC Motor Servo with the motor. A four-bit digital-to-analog converter
Drives (DAC) provides a digital path for controlling the motor
current, and, by extension, simplifies implementation
• Automated Factory, Medical and Office of full, half and microstep stepper motor drives. For Equipment higher resolutio