A3977SLP-T A3977SLPTR-T TSSOP-28 Bipolar Motor Driver DMOS Logic Controllers Chip
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A3977SLP-T A3977SLPTR-T TSSOP-28 Bipolar Motor Driver DMOS Logic Controllers Chip

IC MTR DRV BIPOLR 3-5.5V 28TSSOP
  • A3977SLPTR-T

  • Allegro MicroSystems

  • A3977-Datasheet.pdf

  • ICPlanet

  • Bipolar Motor Driver DMOS Logic 28-TSSOP-EP

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TYPE
DESCRIPTION
Category
Integrated Circuits (ICs)
PMIC - Motor Drivers, Controllers
Mfr
Allegro MicroSystems
Series
-
Package
Tape & Reel (TR)
Cut Tape (CT)
Part Status
Active
Motor Type - Stepper
Bipolar
Motor Type - AC, DC
-
Function
Driver - Fully Integrated, Control and Power Stage
Output Configuration
Half Bridge (4)
Interface
Logic
Technology
DMOS
Step Resolution
1, 1/2, 1/4, 1/8
Applications
General Purpose
Current - Output
2.5A
Voltage - Supply
3V ~ 5.5V
Voltage - Load
8V ~ 35V
Operating Temperature
-20°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Supplier Device Package
28-TSSOP-EP
DESCRIPTION

The A3977 is a complete microstepping motor driver with  built-in translator. It is designed to operate bipolar stepper  motors in full-, half-, quarter-, and eighth-step modes, with  output drive capability of 35 V and ±2.5 A. The A3977 includes  a fixed off-time current regulator that has the ability to operate in  slow-, fast-, or mixed-decay modes. This current-decay control  scheme results in reduced audible motor noise, increased step  accuracy, and reduced power dissipation.

The translator is the key to the easy implementation of the  A3977. Simply inputting one pulse on the STEP input drives the  motor one step (two logic inputs determine if it is a full-, half-,  quarter-, or eighth-step). There are no phase-sequence tables,  high-frequency control lines, or complex interfaces to program.  The A3977 interface is an ideal fit for applications where a  complex microprocessor is unavailable or overburdened. 

Internal synchronous-rectification control circuitry is provided  to improve power dissipation during PWM operation.  

Internal circuit protection includes thermal shutdown with  hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power-up sequencing is not required.  

The A3977 is supplied in a thin (<1.2 mm) 28-pin TSSOP with  an exposed thermal pad (suffix LP). The A3977 is lead (Pb)  free, with 100% matte tin leadframe plating

FEATURES AND BENEFITS

• ±2.5 A, 35 V output rating 

• Low RDS(on) outputs, 0.28 Ω source, 0.22 Ω sink typical 

• Automatic current decay mode detection/selection 

• 3.0 to 5.5 V logic supply voltage range 

• Mixed, fast, and slow current decay modes 

• Home output 

• Synchronous rectification for low power dissipation 

• Internal UVLO and thermal shutdown circuitry 

• Crossover-current protection

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