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

Datasheet	Packaging	Samples & Pricing	Reliability	Knowledge Base

Features

•	DMOS power stage rated at 55V and 3A continuous
•	Low R_DS(ON) of typically 0.3 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 T_J = 155°C
•	Overcurrent protection
•	No shoot-through currents
•	15-lead TO-220 molded power package

General 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. More...

Applications

•	Full, half and microstep stepper motor drives
•	Stepper motor and brushed DC motor servo drives
•	Automated factory, medical and office equipment

Parameters Values

Function Full Bridge Driver

Output Current 3000 mA

Channels 2 Channels

Supply Min 12 Volt

Supply Max 55 Volt

Temperature Min -40 deg C

Temperature Max 125 deg C

Typical Performance

*click for larger image

Also Recommended

LM5102	Dual 100V High Side / Low Side Mosfet Driver
LM5104	Dual 100V High Side / Low Side Mosfet Driver W/ Single Pwm Input
LMD18200▲	LMD18245 Without Digital Control Circuitry

Block Diagram

*click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LMD18245 3A, 55V DMOS Full-Bridge Motor Driver	1094 Kbytes	8-Feb-06	Download
LMD18245 3A, 55V DMOS Full-Bridge Motor Driver (Japanese)	1206 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LMD18245T

TO-220

NOPB
STD

1
1

NA
NA

RoHS

N/A

Full production

N/A

1K+

$9.61

rail
of
20

NSUZXYTTE#
LMD18245T
P+

6 weeks

100

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMD18245J-QML	NONE	NONE	08 Mar 2000

General 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 multi-technology 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.

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 R_DS(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.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMD18245T	LMDMOS	0	17710	0	0	2470000	2	700869244

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

[Information as of 8-Nov-2009]