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LMD18245
www.ti.com
SNVS110E – APRIL 1998 – REVISED APRIL 2013
LMD18245 3A, 55V DMOS Full-Bridge Motor Driver
Check for Samples: LMD18245
FEATURES
DESCRIPTION

The
LMD18245
full-bridge
power
amplifier
incorporates all the circuit blocks required to drive
and control current in a brushed type DC motor or
one phase of a bipolar stepper motor. The multitechnology process used to build the device
combines bipolar and CMOS control and protection
circuitry with DMOS power switches on the same
monolithic structure. The LMD18245 controls the
motor current via a fixed off-time chopper technique.
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DMOS Power Stage Rated at 55V and 3A
Continuous
Low RDS(ON) of Typically 0.3Ω per Power
Switch
Internal Clamp Diodes
Low-loss Current Sensing Method
Digital or Analog Control of Motor Current
TTL and CMOS Compatible Inputs
Thermal Shutdown (Outputs Off) at TJ = 155°C
Overcurrent Protection
No Shoot-Through Currents
15-lead Package
APPLICATIONS



Full, Half and Microstep Stepper Motor Drives
Stepper Motor and Brushed DC Motor Servo
Drives
Automated Factory, Medical and Office
Equipment
An all DMOS H-bridge power stage delivers
continuous output currents up to 3A (6A peak) at
supply voltages up to 55V. The DMOS power
switches feature low RDS(ON) for high efficiency, and a
diode intrinsic to the DMOS body structure eliminates
the discrete diodes typically required to clamp bipolar
power stages.
An innovative current sensing method eliminates the
power loss associated with a sense resistor in series
with the motor. A four-bit digital-to-analog converter
(DAC) provides a digital path for controlling the motor
current, and, by extension, simplifies implementation
of full, half and microstep stepper motor drives. For
higher resolution applications, an external DAC can
be used.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1998–2013, Texas Instruments Incorporated
LMD18245
SNVS110E – APRIL 1998 – REVISED APRIL 2013
www.ti.com
Functional Block and Connection Diagram
15-Lead TO-220 Power Package (NDL)
Figure 1. Functional Block Diagram
Connection Diagram
Figure 2. Top View
15-Lead Package TO-220 Power Package
See Package Number NDL0015A
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Copyright © 1998–2013, Texas Instruments Incorporated
Product Folder Links: LMD18245
LMD18245
www.ti.com
SNVS110E – APRIL 1998 – REVISED APRIL 2013
Pinout Descriptions
(See Functional Block and Connection Diagrams)
Pin 1, OUT 1: Output node of the first half H-bridge.
Pin 2, COMP OUT: Output of the comparator. If the voltage at CS OUT exceeds that provided by the DAC, the
comparator triggers the monostable.
Pin 3, RC: Monostable timing node. A parallel resistorcapacitor network connected between this node and