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Allegro MicroSystems A2919SLBTR
- Part No.:
- A2919SLBTR
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A2919SLBTR.pdf
- Description:
- IC MOTOR DRIVER BIPOLAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,595
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Product details
Overview
A2919SLBTR from Allegro MicroSystems is a dual full-bridge PWM motor driver IC designed to control two DC motors bidirectionally or drive both windings of a bipolar stepper motor. It sustains 45 V motor supply, delivers 750 mA continuous output current per bridge, and features internal PWM current control with selectable current limits (0%, 41%, 67%, 100%). It is used in industrial motion control systems requiring precise microstepping and thermal robustness.
For engineers reviewing the A2919SLBTR datasheet, A2919SLBTR pinout, A2919SLBTR application, or A2919SLBTR equivalent, key selection criteria include its 24-pin SOICW package with exposed thermal tabs, integrated clamp/flyback diodes, fixed off-time PWM architecture (46 µs typ), and logic-level I₀/I₁ current scaling inputs for half/quarter-step sequencing.
Technical Context
The A2919SLBTR implements two independent H-bridge channels, each with source/sink drivers, internal ground-clamp and flyback diodes, and monostable-based PWM current regulation. Current limiting is set via external sense resistor (RS) and reference voltage (VREF), with trip threshold defined as ITRIP = VREF/10RS at 100% mode.
Direction control is managed by dedicated PHASE inputs per channel, with internally generated ~2 µs dead time preventing shoot-through. Thermal shutdown activates at 170°C junction temperature and recovers at 145°C; no special power-up sequencing is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Sustaining Voltage | 45 V - supports industrial motor supplies up to 45 V without external protection |
| Continuous Output Current | ±750 mA per bridge - enables driving NEMA 17–23 stepper motors or small DC actuators |
| Output Saturation Voltage | <1.8 V total (source + sink) at 500 mA - minimizes conduction loss and self-heating during sustained operation |
| PWM Fixed Off-Time | 46 µs typical - ensures current chopping remains above audible range while enabling stable regulation |
| Logic Supply Range | 4.75–5.25 V - compatible with standard 5 V microcontroller I/O without level shifting |
| Thermal Shutdown Threshold | 170°C junction - provides fail-safe protection during overload or inadequate heatsinking |
| Current Limit Selection | Four discrete levels (0%/41%/67%/100%) via I₀/I₁ logic inputs - enables torque-matched half/quarter-stepping without firmware interpolation |
Pinout & Package
Package: 24-pin SOICW (suffix LB) with exposed thermal tab - batwing construction optimized for surface-mount thermal dissipation; RθJA = 55°C/W, RθJT = 6.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBB | Motor supply input | High-side power rail for both bridges; must be decoupled near pin 1 with ≥10 µF low-ESR capacitor |
| GND (pins 2–5, 12, 13, 20–23) | Power and logic ground | Eight dedicated ground pins minimize IR drop and improve current return path integrity |
| OUT1A / OUT1B / OUT2A / OUT2B | H-bridge output terminals | Drive motor windings directly; each pair forms one full bridge with internal source/sink capability |
| PHASE1 / PHASE2 | Direction control inputs | Set current direction per bridge; internally pulled high, require active-low or logic-level drive |
| I₀ / I₁ | Current limit select inputs | Digital inputs selecting 4 preset winding current levels; enable microstepping sequences without analog DAC |
| VREF1 / VREF2 | Reference voltage inputs | Analog inputs setting maximum current trip point per bridge; support continuous microstepping when varied |
| SENSE1 / SENSE2 | Current sense inputs | Connect to external sense resistors (RS); comparator monitors voltage drop to trigger PWM off-cycle |
| RC1 / RC2 | RC timing network connections | Interface with RT/CT components to set fixed off-time; RT = 56 kΩ and CT = 820 pF yields 46 µs typical |
Key Features
| Feature | Design Value |
|---|---|
| Integrated clamp and flyback diodes | Eliminates need for 8 external diodes in H-bridge design, reducing BOM count and PCB area |
| Internal thermal shutdown | Automatically disables outputs at 170°C junction temperature, protecting against irreversible damage during stall or short-circuit |
| Logic-compatible current scaling | I₀/I₁ inputs allow microcontroller GPIOs to switch between 4 discrete torque levels-no DAC or additional logic required |
| Low saturation voltage design | <1.8 V total VCE(SAT) at 500 mA reduces power dissipation by >30% vs. comparable drivers with 2.5 V drop |
| Batwing SOICW package | Exposed thermal tab and optimized leadframe geometry achieve RθJT = 6.0°C/W, enabling 750 mA per bridge without external heatsink |
Applications
| Industrial Stepper Positioning | Medical Pump Actuation |
|---|---|
|
Use Scenario: Precision open-loop positioning in CNC tool changers and lab automation stages. IC Role / Device Role / Timing Role: Dual full-bridge driver controlling bipolar stepper motor windings with quarter-step resolution. Use Value: I₀/I₁ logic inputs enable 16-step sequence without microcontroller PWM modulation, reducing firmware overhead and jitter. |
Use Scenario: Bidirectional peristaltic pump control in infusion devices requiring smooth, reversible flow. IC Role / Device Role / Timing Role: Dual H-bridge delivering regulated 750 mA to drive 24 V DC pump motors with direction reversal. Use Value: Internal clamp diodes and 45 V sustaining voltage eliminate external flyback components, meeting IEC 60601 creepage requirements. |
| Factory Automation Conveyors | Test Equipment Motion Control |
|
Use Scenario: Low-speed, high-torque actuation of indexing conveyors in packaging lines. IC Role / Device Role / Timing Role: Motor driver providing hold current reduction (via I₀/I₁ = 41%) and startup boost (100%) under PLC command. Use Value: Selectable current limits reduce standby power by 59% vs. fixed 750 mA, extending system thermal margin during idle periods. |
Use Scenario: Calibration stage movement in automated test fixtures requiring repeatable sub-millimeter positioning. IC Role / Device Role / Timing Role: Bipolar stepper driver operating in half-step mode with constant torque across all positions. Use Value: PHASE + I₀/I₁ coordination ensures torque consistency between single-phase and dual-phase energization states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual full-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher 4.5 A peak current, but requires external flyback diodes and separate current-sense amplifiers | Targeted at larger NEMA 23–34 steppers; lacks integrated thermal shutdown and logic-level current scaling | Choose TB6600HG only when >1 A current and external component tolerance are acceptable trade-offs for higher torque |
| DRV8825 | Microstepping up to 32x, integrated current DAC, but lower 2.2 A max and 40 V rating | Designed for compact 3D printer axes; lacks 45 V rating and batwing thermal package for industrial ambient | Prefer DRV8825 for space-constrained consumer-grade designs where 40 V and 2.2 A suffice and microstepping granularity is critical |
Compared with TB6600HG and DRV8825, the A2919SLBTR uniquely balances industrial voltage margin (45 V), integrated protection (clamps + thermal shutdown), and logic-driven current scaling-making it optimal for cost-sensitive, thermally demanding factory-floor motion systems where external component count must be minimized.
Availability
A2919SLBTR is available at Aetrix Electronics and suitable for industrial motion control, medical fluid handling, and automated test equipment requiring stable component supply despite its Last Time Buy status.
Supply support for A2919SLBTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based designer of high-performance magnetic sensing and power ICs, founded in 1989 and headquartered in Worcester, Massachusetts.
The A2919SLBTR belongs to Allegro's legacy motor driver product line, engineered specifically for robust, integrated bipolar stepper and dual-DC motor control in industrial environments with minimal external components.
FAQ
What is the recommended operating temperature range for the A2919SLBTR?
The A2919SLBTR is specified for operation from –20°C to +85°C ambient temperature. Its thermal shutdown activates at 170°C junction temperature and recovers at 145°C. For reliable long-term performance, maintain PCB copper area under the exposed thermal tab and ensure airflow or heatsinking if ambient exceeds 70°C. The A2919SLBTR datasheet confirms these limits apply to the standard 'LB' package variant.
Can the A2919SLBTR drive a unipolar stepper motor?
No, the A2919SLBTR is designed exclusively for bipolar stepper motors or dual DC motors. Its H-bridge topology requires center-tap–free windings and cannot interface with the five- or six-wire configurations typical of unipolar steppers. Attempting to use the A2919SLBTR with a unipolar motor will result in incorrect phase energization and potential driver damage. Use dedicated unipolar drivers such as the ULN2003 for those applications.
How does the A2919SLBTR implement PWM current control without an external oscillator?
The A2919SLBTR uses an internal monostable multivibrator triggered by the current-sense comparator. When sensed voltage across RS reaches VREF/10, the monostable turns off the source driver for a fixed duration determined by external RT and CT. This self-timed off-cycle eliminates need for external clock generation. The A2919SLBTR's typical off-time is 46 µs with RT = 56 kΩ and CT = 820 pF, as verified in the Electrical Characteristics table.
Is the A2919SLBTR pin-compatible with newer Allegro motor drivers like the A4988?
No, the A2919SLBTR is not pin-compatible with the A4988 or other modern Allegro drivers. It uses a 24-pin SOICW package with dedicated VREF, SENSE, RC, PHASE, and I₀/I₁ pins arranged for discrete external timing and current scaling. The A4988 uses a 28-pin QFN with integrated oscillator and different pin functions. Migration requires PCB redesign and firmware adaptation due to fundamental architectural differences in current control and interface logic.
What is the purpose of the eight ground pins on the A2919SLBTR package?
The eight ground pins (pins 2–5, 12, 13, 20–23) provide low-impedance return paths for high-current motor switching and logic signals, minimizing ground bounce and voltage offset between bridges. This layout reduces electromagnetic interference and improves current regulation accuracy-especially critical when both bridges operate simultaneously at 750 mA. The A2919SLBTR's thermal and electrical performance depends on proper connection of all ground pins to a solid PCB ground plane.
A2919SLBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- 1/2, 1/4
- Applications:
- General Purpose
- Current - Output:
- 750mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 45V
- Operating Temperature:
- -20°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
A2919SLBTR FAQ
1.How can I place an order for A2919SLBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for A2919SLBTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A2919SLBTR reliable?
The price and inventory of A2919SLBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A2919SLBTR is usually 5 days.
3.What payment methods are accepted for A2919SLBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A2919SLBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A2919SLBTR?
A2919SLBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A2919SLBTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A2919SLBTR?
For technical support, including A2919SLBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A2919SLBTR requirements.
6.How does Aetrix verify that A2919SLBTR is sourced from the original manufacturer or authorized distributors?
All A2919SLBTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A2919SLBTR meets industry standards.
7.What is the process for return or replacement of A2919SLBTR?
All A2919SLBTR units undergo pre-shipment inspection (PSI). If there is an issue with A2919SLBTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A2919SLBTR part is unused and in its original packaging.
Return procedure for A2919SLBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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