Stepper Motor Controller
(24 Pins)

LS7290-S, LS7290-TS, LS7290

Category: Stepper Motor Controls

Status: In Production

Stock Availability: DIP, SOIC, TSSOP

All of our Standard Products are RoHS Compliant

For pricing and availability you may contact us, or request a quote. Most of our standard parts are available for purchase on Digi-Key, and through our Distributors.

Features:

• Controls Bipolar and Unipolar Stepper Motors
• Full, 1/2 step modes selection
• Direct interface to L298 for BiPolar motors
• Enable, Step, Direction and Reset control inputs
• PWM chopper circuit for step and torque control
• Two peak current sense comparators with external reference input
• Programmable interstep blanking delay
• 3 to 5.5 volt operation

Description:

The LS7290 generates Phase Drive outputs and PWM outputs for controlling two-phase Bipolar Motors or four-phase Unipolar Motors, respectively. The LS7290 contains a mode controlled look-up table for generating the motor duty cycle drive sequences. There are four outputs which are used to drive two H-Bridges for the two motor windings in the Bipolar motor or the four driver transistors for the two centertapped windings in the Unipolar motor. The LS7290 can step a motor in full steps and half steps. The refresh rate is set using an internal oscillator controlled by a crystal or by use of an external input clock. Typical refresh rate is equal to 31.25kHz with the clock frequency set at 8MHz. Peak-current feedback control using pulse-width modulation is used in full-step or half-step modes. The chopper consists of a voltage comparator, flip-flop and external sense resistor. The internal oscillator sets the flip-flop and enables the INH1 and INH2 outputs at the beginning of each PWM cycle. Once the peak motor current causes the voltage across the sense resistors to reach the voltage set by VREF, the outputs are disabled until the next oscillator pulse. The VREF voltage sets the peak current in each motor winding.

Ordering Info

Code
Package
Notes

P/N

RoHS Compliant Standard plastic DIP

1, 2, 3

P/N – S

RoHS Compliant Standard SOIC

1, 2, 3, 4

P/N – SW

RoHS Compliant Widebody SOIC option

1, 2, 3, 4

P/N – S14

RoHS Compliant 14-pin SOIC version of 8-pin part

1, 2, 3, 4

P/N – TS

RoHS Compliant TSSOP

1, 2, 3, 4

P/N – TS24

RoHS Compliant 24-pin TSSOP version of 20-pin part

1, 2, 3, 4

Example: LSxxxx-TS = the LSxxxx in the RoHS Compliant TSSOP package-type

Note 1: See Table for package body widths

Note 2: Package outline drawings conform to JEDEC standards

Note 3: Packages shipped in anti-static tubes

Note 4: Tape and Reel option available. Contact factory for details

ADDITIONAL ORDERING OPTIONS:

Probed Wafers (P/N-PW), Waffle Packed Die (P/N-WP)

Package Body Widths
# of Pins
P/N, -C, -CM
-S
-SW
-TS

8

300

150

14

300

150

173

16

300

150

300

18

300

300

20

300

300

173

24

600

300

173

28

600

300

173

38

173

40

600

44

240

LSI/CSI