AM2170

Motor Driver ICs

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Dual Full-Bridge PWM Motor Driver

AM2170

The AM2170 motor driver is designed to drive both windings of a bipolar stepper motor or to control

bi-directionally two DC motors. Both bridges are capable of sustaining 45V and include internal pulse-width

modulation (PWM) control of the output current to 750mA. The outputs have been optimized for a low output

saturation voltage drop (less than 1.8V total source plus sink at 500mA).

For PWM current control, the maximum output current is determined by the user’s selection of a reference voltage

and sensing resistor. Two logic-level inputs select output current limits of 0, 33%, 67%, or 100% of the maximum

level. A PHASE input to each bridge determines load current direction.

The bridges include both ground clamp and fly-back diodes for protection against inductive transients. Internally

generated delays prevent cross-over currents when switching current direction. Special power-up sequencing is not

required. A thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits.

The IC is supplied in HSOP28 Package. Its thermal wing construction provides for maximum package power

dissipation in the smallest possible construction. Package material is Pb-Free for purpose of environmental

protection.

Applications

Scanner, Printer, MFP

Features

1) 750mA continuous output current

2) 45V output sustaining voltage

3) Internal clamp diodes

4) Internal PWM current control

5) Low output saturation voltage

6) Internal thermal shutdown circuitry

Parameter

Symbol

Limits

Unit

Motor supply voltage

45

V

Peak

+1.0

A

Output current

Continuous

+750

mA

Logic supply voltage

7.0

V

Logic input voltage range

-0.3 ~ +7.0

V

Output emitter voltage

1.5

V

Operating temperature range

-20 ~ +85

℃

Storage temperature range

-55 ~ +150

℃

*Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of

conditions, do not exceed the specified peak current rating or a junction temperature of +150℃.