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Allegro MicroSystems A2919SB
- Part No.:
- A2919SB
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-PowerDIP (0.300", 7.62mm)
- Datasheet:
-
A2919SB.pdf
- Description:
- IC MTRDRV BIPLR 4.75-5.25V 24DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
A2919SB 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 0%/41%/67%/100% current limits-used in industrial motion control, printer mechanisms, and automated valve actuation.
For engineers reviewing the A2919SB datasheet, A2919SB pinout, A2919SB application, or A2919SB equivalent, key selection criteria include its 24-pin SOICW-LB package with exposed thermal tab, integrated clamp/flyback diodes, fixed off-time PWM architecture (46 μs typ), thermal shutdown at 170°C, and logic-level PHASE/I0/I1 interface for microstepping control.
Technical Context
The A2919SB implements two independent H-bridge channels, each with source/sink drivers, internal ground-clamp and flyback diodes, and monostable-based fixed off-time PWM current regulation. Current sensing uses external RS resistors and internal comparators referenced to VREF (1.0–7.5 V), with trip thresholds determined by I0/I1 logic inputs.
Dead time (~2 μs) prevents shoot-through during PHASE transitions; thermal protection disables all outputs at TJ = 170°C and re-enables at 145°C. No special power-up sequencing is required, and all logic inputs float high-enabling direct μP interfacing without pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Supply Voltage | 45 V max - supports industrial 24 V and 36 V DC bus systems without external clamping. |
| Continuous Output Current | ±750 mA per bridge - enables driving NEMA 11–14 stepper motors or small DC actuators continuously. |
| Output Saturation Voltage | ≤1.8 V total (source + sink) at 500 mA - minimizes conduction loss and thermal load in compact layouts. |
| PWM Fixed Off-Time | 46 μs typical (RT=56 kΩ, CT=820 pF) - ensures current chopping remains above audible range (>21 kHz). |
| Thermal Shutdown Threshold | 170°C junction temperature - provides robust overtemperature protection without latch-up. |
| Logic Input Compatibility | CMOS/TTL-compatible (VIN(1) ≥2.4 V, VIN(0) ≤0.8 V) - interfaces directly with 5 V microcontrollers and FPGAs. |
| Reference Voltage Range | 1.0–7.5 V - allows precise peak current tuning from ~100 mA to >1 A via external RS resistor selection. |
Pinout & Package
Package: 24-pin SOICW (suffix LB) with exposed thermal pad - batwing construction optimized for surface-mount thermal dissipation; RθJA = 55°C/W, RθJT = 6.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 18, 19, 20, 21, 22, 23, 24 | Ground / Thermal Pad | Multiple GND pins and exposed pad provide low-impedance return path and enhanced heat transfer to PCB copper. |
| 8, 11, 12, 13, 14, 15, 16, 17 | Bridge Outputs (OUT1A/1B/2A/2B, SENSE1/2, E1/E2) | High-current terminals for motor winding connection and current sensing; E1/E2 are emitter outputs for sink-side sensing. |
| 9, 10 | PHASE 1 / PHASE 2 | Digital direction control inputs - determine current polarity per bridge; internally debounced with 2 μs dead time. |
| 21, 22 | I0 / I1 | Logic-level current limit select inputs - set 0%/41%/67%/100% of VREF/RS trip point for microstepping or hold/start torque scaling. |
| 19, 20 | VREF1 / VREF2 | Analog reference inputs - accept 1.0–7.5 V to define peak current threshold independently per bridge. |
| 15, 16 | RC1 / RC2 | RC timing network connections - set oscillator frequency for PWM monostable; used with RT/CT for off-time control. |
| 13, 14 | RT / CT | External timing components - define fixed off-time (toff = RT × CT); standard values yield 46 μs for noise-immune operation. |
| 23 | VBB | Main motor supply input - decoupling required near pin; supports up to 45 V with internal clamp diode protection. |
| 24 | VCC | Logic supply input - 4.75–5.25 V operation; powers internal logic, comparators, and gate drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated clamp and flyback diodes | Eliminates need for 8 external diodes in H-bridge design - reduces BOM count, PCB area, and layout complexity. |
| Independent per-bridge PWM current control | Enables asymmetric current profiles across stepper phases - critical for smooth half-step and quarter-step operation. |
| Four-level digital current scaling (I0/I1) | Supports μP-driven torque management: full torque on step, reduced torque during hold, and zero current for fast decay. |
| Batwing SOICW-LB thermal package | Exposes die paddle to PCB copper - achieves 6.0°C/W junction-to-tab thermal resistance for sustained 750 mA dual-channel operation. |
| Internal 2 μs dead-time generation | Prevents shoot-through during PHASE transitions without requiring external timing circuitry or μP delay calibration. |
Applications
| Industrial Printers | Valve Actuation Systems |
|---|---|
|
Use Scenario: Bidirectional stepping of paper feed and head positioning mechanisms in thermal label printers. IC Role / Device Role / Timing Role: Dual full-bridge driver controlling two independent stepper windings with synchronized PHASE and I0/I1 logic. Use Value: Enables precise 1/4-step resolution (16 steps/phase) using programmable current levels-reducing vibration and positional error in high-speed printing. |
Use Scenario: Proportional control of solenoid-actuated fluid valves in HVAC and process automation panels. IC Role / Device Role / Timing Role: PWM current regulator delivering stable 41–100% rated current to DC solenoids based on analog VREF and digital I0/I1 commands. Use Value: Maintains consistent magnetic force across supply voltage variation (10–45 V), eliminating need for external current-sense amplifiers or DACs. |
| Bipolar Stepper Motor Drivers | Automated Test Equipment (ATE) |
|
Use Scenario: Driving NEMA 11 bipolar stepper motors in XY stages for optical alignment and pick-and-place subsystems. IC Role / Device Role / Timing Role: Dual-channel current-regulated H-bridge providing independent winding control with thermal shutdown and fast decay modes. Use Value: Internal 170°C thermal cutoff prevents damage during stall conditions; fast decay (I0=I1=high) enables rapid position correction in closed-loop servo applications. |
Use Scenario: Actuating relay matrices and DUT interface fixtures requiring bidirectional DC motor control and current-limited startup. IC Role / Device Role / Timing Role: Motor driver with logic-level enable/disable (via I0/I1=high) and configurable current limits for safe fixture engagement/disengagement. Use Value: 0% current mode acts as hardware-enabled output disable-preventing unintended motion during test sequence initialization or fault recovery. |
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 |
|---|---|---|---|
| ALLEGRO A3959SLBTR-T | Higher 2.5 A peak current, integrated current sense amplifier, SPI interface instead of I0/I1 logic control. | Requires SPI host controller; supports advanced diagnostics and dynamic current profiling not available on A2919SB. | Choose A3959SLBTR-T when higher current, real-time current monitoring, or programmable decay modes are required. |
| ON SEMICONDUCTOR LV8731V | 40 V max supply, 1.2 A continuous, built-in 1/32 microstepping sequencer, no external RC timing needed. | Reduces μP firmware overhead for microstepping but lacks independent per-bridge VREF control and external PWM timing flexibility. | Choose LV8731V for simplified stepper control with integrated indexer, where discrete current tuning per phase is not required. |
Compared with A3959SLBTR-T and LV8731V, the A2919SB offers deterministic fixed-off-time PWM with user-configurable RC timing, direct logic-level I0/I1 current scaling, and proven thermal performance in SOICW-LB-making it suitable for cost-sensitive, μP-managed stepper and DC motor systems where design simplicity and thermal reliability are prioritized over integrated intelligence.
Availability
A2919SB is available at Aetrix Electronics and suitable for industrial motion control, printer mechanisms, and automated valve actuation requiring stable component supply despite end-of-life status.
Supply support for A2919SB 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 designs high-performance magnetic sensing and power ICs for motion control, automotive safety, and industrial systems, headquartered in Worcester, MA.
The A2919SB belongs to Allegro's legacy dual H-bridge motor driver product line, engineered for robust, thermally efficient control of bipolar steppers and dual DC motors in space-constrained industrial equipment.
FAQ
What is the maximum continuous current rating per bridge of the A2919SB?
The A2919SB supports ±750 mA continuous output current per bridge under specified thermal conditions (TA ≤ 85°C, adequate PCB copper pour on exposed thermal pad). This rating assumes use of the SOICW-LB package with recommended layout per Allegro's Dwg. EP-007-3, and is validated at TJ ≤ 150°C. Exceeding this current without enhanced heatsinking risks thermal shutdown activation.
Does the A2919SB require external flyback diodes for inductive load protection?
No, the A2919SB integrates internal clamp and flyback diodes for both bridges-eliminating the need for eight external diodes in a dual H-bridge configuration. These diodes protect against inductive transients during PWM switching and current decay, as confirmed in the Applications Information section and Absolute Maximum Ratings table of the official datasheet.
How does the A2919SB implement microstepping control?
The A2919SB enables half-step and quarter-step operation through digital logic inputs I0 and I1, which select 0%, 41%, 67%, or 100% of the VREF/RS current limit per bridge. Combined with PHASE inputs, this allows a microcontroller to sequence current levels across two windings-e.g., 100%/0% → 100%/41% → 67%/67%-achieving 16-step/revolution resolution without external sequencer hardware.
What is the purpose of the RC, RT, and CT pins on the A2919SB?
The RC, RT, and CT pins configure the monostable multivibrator that sets the fixed off-time (toff) during PWM current regulation. RC connects to the internal oscillator node; RT and CT form an external RC network (e.g., 56 kΩ + 820 pF) determining toff ≈ RT × CT. This controls current decay rate and ensures chopping frequency stays above audible range-critical for stable microstepping performance in the A2919SB.
Is the A2919SB still in active production and supported for new designs?
No-the A2919SB is classified as Last Time Buy (LTB) with final order deadline October 29, 2010. It is obsolete and restricted to existing customer applications only. New designs should consider alternatives like the Allegro A3959SLBTR-T or ON Semiconductor LV8731V. Aetrix Electronics maintains limited legacy stock for continuity support but does not recommend A2919SB for new development.
A2919SB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-PowerDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 24-DIP
A2919SB FAQ
1.How can I place an order for A2919SB through Aetrix?
Please submit a Request for Quotation (RFQ) for A2919SB 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 A2919SB reliable?
The price and inventory of A2919SB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A2919SB is usually 5 days.
3.What payment methods are accepted for A2919SB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A2919SB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A2919SB?
A2919SB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A2919SB 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 A2919SB?
For technical support, including A2919SB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A2919SB requirements.
6.How does Aetrix verify that A2919SB is sourced from the original manufacturer or authorized distributors?
All A2919SB 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 A2919SB meets industry standards.
7.What is the process for return or replacement of A2919SB?
All A2919SB units undergo pre-shipment inspection (PSI). If there is an issue with A2919SB, 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 A2919SB part is unused and in its original packaging.
Return procedure for A2919SB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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