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A3977SLPTR-T
Allegro MicroSystems
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 |
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
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 |
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
