Combining low-power CMOS logic with high-current, high-voltage power FET outputs, the SLA7051M translator/driver provides complete control and drive for a two-phase unipolar stepper motor with internal fixed off time, pulse-width modulation (PWM) control of the output current in a power multi-chip module (PMCMT).

The CMOS logic section provides the sequencing logic, direction, full/half-step control, synchronous/asynchronous PWM operation, and a "sleep" function. The minimum CLOCK input is an ideal fit for applications where a complex µP is unavailable or overburdened. TTL or LSTTL may require the use of appropriate pull-up resistors to ensure a proper input-logic high. For PWM current control, the maximum output current is determined by the user's selection of a reference voltage and sensing resistor. The NMOS outputs are capable of sinking up to 2 A and withstanding 46 V in the off state. Ground-clamp and flyback diodes provide protection against inductive transients. Special power-up sequencing is not required.

Full-step (2 phase) and half-step operation are externally selectable. Two-phase drive energizes two adjacent phases in each detent position (AB-BC-CD-DA). This sequence mode offers an improved torquespeed product, greater detent torque, and is less susceptable to motor resonance. Half-step excitation alternates between the one-phase and two-phase modes (A-AB-B-BC-C-CD D-DA), providing an eight-step sequence.

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • 2 A Output Rating
  • Internal Sequencer for Full or Half-Step Operation
  • PWM Constant-Current Motor Drive
  • Cost-Effective, Multi-Chip Solution
  • 100 V, Avalanche-Rated NMOS
  • Low rDS(on) NMOS Outputs (700 milli-ohms typical)
  • Advanced, Improved Body Diodes
  • Half-Step and Full-Step Unipolar Drive
  • Inputs Compatible with 3.3 V or 5 V Control Signals
  • Sleep Mode
  • Internal Clamp Diodes

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Functional Block Diagram Pinout Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
SLA7051MLF871 18-lead ZIP -20°C to 85°C Yes View Data Not for new design Contact your
local sales rep
Check Stock
SLA7051MLF872 18-lead ZIP -20°C to 85°C Yes View Data Not for new design Contact your
local sales rep
Check Stock

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