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Analog Devices Inc./Maxim Integrated TMC248-LA-X
- Part No.:
- TMC248-LA-X
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Motor Drivers, Controllers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
TMC248-LA-X.pdf
- Description:
- IC MTR DRVR BIPOLAR 3-5.5V 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,719
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Product details
Overview
TMC248-LA-X from TRINAMIC Motion Control GmbH & Co. KG is a dual full-bridge stepper motor driver IC designed to control external high-efficiency MOSFETs for bipolar two-phase stepper motors. It delivers up to 7 A motor current at 7–36 V DC supply, supports 64× microstepping, integrates stallGuard™ sensorless load measurement, and operates in SPI or analog standalone mode. It is used in precision motion systems such as lab automation liquid handling and antenna positioning.
For engineers reviewing the TMC248-LA-X datasheet, TMC248-LA-X pinout, TMC248-LA-X application, or TMC248-LA-X equivalent, key selection considerations include its external MOSFET gate drive capability, 3-bit stallGuard™ load indicator output, mixed-decay chopper control, slope-controlled EMI reduction, and dual-mode interface (SPI + analog phase/current inputs) for flexible system integration.
Technical Context
The TMC248-LA-X implements a dual full-bridge architecture with eight dedicated gate drivers (HA1/HA2/HB1/HB2/LA1/LA2/LB1/LB2) for external P- and N-channel MOSFETs. Its chopper control uses adaptive mixed-decay and voltage PWM modes, synchronized to an internal oscillator or external clock via OSC pin, enabling low-noise operation and precise current regulation via 4-bit DACs per coil.
It embeds real-time diagnostics including overcurrent (high/low side), open-load detection per bridge, overtemperature shutdown with prewarning, undervoltage monitoring on VS, and stallGuard™-a sensorless load estimator derived from back-EMF analysis updated once per full step and reported via LD2–LD0 bits in SPI status word.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Current | Up to 7 A via external MOSFETs - enables high-torque stepper control without integrated power stage limitations. |
| Supply Voltage Range | 7 V–36 V DC for motor (VS); 3.0–5.5 V DC for logic (VCC) - supports wide industrial input rails and separate analog/digital domains. |
| Microstep Resolution | Up to 64 microsteps per full step - achieved via SPI-programmed 4-bit DAC values per coil, enabling smooth low-speed motion. |
| stallGuard™ Output | 3-bit unsigned load indicator (LD2–LD0) - provides real-time mechanical load estimation without sensors; value 0 indicates stall condition. |
| Protection Features | Overvoltage (via ENN), overtemperature (shutdown + OTPW prewarning), short-circuit, and open-load detection - ensures robust field operation with automatic fault recovery. |
| Control Interfaces | SPI (12-bit command/status) and analog standalone mode (INA/INB current control + PHA/PHB polarity) - allows firmware-driven precision or hardware-simplified deployment. |
| Package | QFN28, 5 mm × 5 mm, exposed thermal pad - supports compact PCB layout and efficient heat dissipation when mounted to GND plane. |
Pinout & Package
Package: QFN28, 5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad (to be connected to GND plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HA1, HA2, HB1, HB2 | High-side gate drivers | Drive external P-channel MOSFET sources; configured for dual full-bridge topology with independent phase control. |
| LA1, LA2, LB1, LB2 | Low-side gate drivers | Drive external N-channel MOSFET drains; paired with HA/HB outputs to form complete H-bridges for coils A and B. |
| INA, INB | Analog current reference inputs | Set base coil current scale (0–3 V); used in both SPI and standalone modes to calibrate DAC full-scale trip voltage (e.g., 2 V = 100% current). |
| PHA, PHB | Digital polarity control | In standalone mode: define current direction per coil (0 = OA1→OA2 / OB1→OB2); in SPI mode: bit 6 and bit 0 of command word. |
| SRA, SRB | Current sense comparator inputs | Accept voltage drop across external sense resistors (RS) to close current regulation loop; referenced to AGND. |
| CSN, SCK, SDI, SDO, SPE | SPI interface signals | Enable serial configuration and status readback; SPE high enables SPI mode; CSN active-low selects device for 12-bit command/status exchange. |
| ENN | Enable & overvoltage input | Active-low enable; pulled high disables driver and enters shutdown; also triggers overvoltage protection if VS exceeds safe threshold. |
| SLP, BL1, BL2 | EMI & timing control | SLP sets chopper slope (via resistor to GND); BL1/BL2 configure blank time to prevent false overcurrent detection during switching transitions. |
Key Features
| Feature | Design Value |
|---|---|
| stallGuard™ sensorless load detection | Provides real-time 3-bit mechanical load feedback (LD2–LD0) without external sensors - enables silent homing and overload prediction in lab automation and medical devices. |
| Mixed-decay chopper control | Reduces torque ripple and audible noise by dynamically blending fast/slow decay - critical for smooth motion in office automation and textile machinery. |
| Slope control (SLP pin) | Adjusts gate drive slew rate to suppress electromagnetic emissions - simplifies EMC compliance in CCTV and POS terminals. |
| Dual control interface | Supports both SPI-based microcontroller coordination and analog/digital standalone operation - allows reuse of legacy firmware while enabling advanced features like stallGuard™ reporting. |
| Standby & shutdown modes | Reduces quiescent current to <100 µA in shutdown (ENN high); standby mode retains register state while disabling gate drivers and oscillator - extends battery life in portable heliostat controllers. |
Applications
| Lab Automation | Medical Devices |
|---|---|
Use Scenario: Precision liquid dispensing in automated pipetting systems requiring repeatable sub-microliter accuracy and silent operation. IC Role / Device Role / Timing Role: Dual full-bridge gate driver controlling external MOSFETs for bipolar stepper-driven syringe pumps; executes microstepped motion via SPI or analog inputs. Use Value: stallGuard™ detects clogged nozzles or dry-run conditions without added sensors; mixed-decay chopper eliminates vibration-induced droplet misplacement. | Use Scenario: Motorized focus and zoom adjustment in diagnostic imaging equipment where EMI must not interfere with signal integrity. IC Role / Device Role / Timing Role: Stepper driver IC managing coil current and decay mode in real time; slope control (SLP) minimizes radiated emissions near sensitive analog front-ends. Use Value: Low-noise voltage PWM chopper and programmable blank time (BL1/BL2) prevent false overcurrent trips during rapid direction reversals. |
| Antenna Positioning | Office Automation |
Use Scenario: Closed-loop azimuth/elevation tracking in satellite ground stations using stepper-driven rotators under variable wind loads. IC Role / Device Role / Timing Role: High-current gate driver (7 A capable) interfacing with discrete MOSFETs; stallGuard™ reports mechanical load changes to adjust torque in real time. Use Value: 3-bit load indicator enables adaptive current scaling - maintains position hold under gust loads while reducing power during calm conditions. | Use Scenario: Paper feed and scanner carriage movement in multifunction printers requiring quiet, jitter-free motion at low speeds. IC Role / Device Role / Timing Role: Dual-phase stepper controller executing 64× microstepping via SPI-configured DACs; standalone mode supports simple MCU GPIO control. Use Value: Low-noise chopper and smooth mixed-decay operation eliminate audible whine and paper skew caused by torque ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper motor gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMC249-LA | Same pinout and feature set but adds integrated charge pump for enhanced high-side gate drive; supports higher MOSFET VGS requirements. | Better suited for driving 100 V+ external MOSFETs in industrial pumps; requires no external bootstrap components. | Select TMC249-LA when driving high-voltage MOSFETs or needing improved gate drive margin beyond TMC248-LA-X's native level-shifting capability. |
| DRV8818PWPR | Integrated H-bridge (no external MOSFETs); max 2.5 A RMS; fixed 1/8–1/32 microstepping; no stallGuard™ or slope control. | Targeted at cost-sensitive, lower-power applications like POS receipt printers; lacks sensorless diagnostics and EMI tuning. | Choose DRV8818PWPR only for space-constrained, low-current designs where external FET flexibility and advanced diagnostics are unnecessary. |
Compared with TMC248-LA-X, TMC249-LA offers superior gate drive for high-VDS MOSFETs without external circuitry, while DRV8818PWPR trades external FET scalability and smart diagnostics for integration and lower BOM count - making TMC248-LA-X the optimal balance of power, intelligence, and design flexibility for mid-to-high current stepper systems.
Availability
TMC248-LA-X is available at Aetrix Electronics and suitable for lab automation, medical instrumentation, antenna positioning, and office automation applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial-grade motion control.
Supply support for TMC248-LA-X 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
TRINAMIC Motion Control GmbH & Co. KG is a German semiconductor company specializing in high-performance motion control ICs, known for innovations in stepper and BLDC motor control, integrated diagnostics, and EMI-optimized drive architectures.
The TMC248-LA-X belongs to TRINAMIC's external-FET stepper driver product line, engineered for applications demanding high current density, sensorless load monitoring, and dual-interface flexibility - particularly in miniaturized, noise-sensitive, and reliability-critical motion systems.
FAQ
What is the maximum motor current supported by the TMC248-LA-X?
The TMC248-LA-X supports up to 7 A motor current when paired with appropriately rated external MOSFETs and sense resistors. This rating assumes proper PCB layout, thermal management (exposed pad soldered to GND plane), and adherence to the absolute maximum ratings in the datasheet - notably 36 V maximum VS supply and 150 °C junction temperature limit. The actual achievable current depends on MOSFET RDS(on), heatsinking, and ambient conditions.
Does the TMC248-LA-X integrate power MOSFETs or require external ones?
The TMC248-LA-X does not integrate power MOSFETs; it is a gate driver IC requiring eight external discrete MOSFETs (four high-side P-channel and four low-side N-channel) to form two full H-bridges. This architecture enables scalable current handling, thermal separation, and optimization for specific motor voltage/current requirements - unlike fully integrated drivers such as the TMC2209 or DRV8825.
How does stallGuard™ work on the TMC248-LA-X and what is its output format?
stallGuard™ on the TMC248-LA-X performs sensorless load measurement by analyzing back-EMF-related effects on coil current waveforms during mixed-decay off periods. It outputs a 3-bit unsigned value (LD2–LD0) via SPI status word or standalone ERR pin behavior, where 0 indicates imminent stall and values 3–7 reflect nominal no-load conditions. The value updates once per full step and requires sine-commutated motion with mixed decay disabled near zero-crossing for accuracy.
Can the TMC248-LA-X operate without a microcontroller using only analog and digital signals?
Yes, the TMC248-LA-X supports standalone mode: tie SPE to GND, use INA/INB for analog current scaling (0–3 V), and PHA/PHB for digital polarity control. In this mode, internal DACs default to full scale (1111), and microstepping resolution is determined by external step pulse sequencing - enabling simple implementation in systems lacking SPI-capable MCUs, such as legacy industrial controllers or FPGA-based motion sequencers.
What protection features are built into the TMC248-LA-X?
The TMC248-LA-X integrates overvoltage (via ENN pin), overtemperature (with shutdown and OTPW prewarning), short-circuit (per-bridge high/low-side overcurrent), and open-load detection (per bridge, triggered after 14 oscillator cycles without PWM toggle). All faults generate flags readable via SPI status word and can assert ERR pin high in standalone mode - providing comprehensive fault visibility and safe failover for mission-critical motion systems.
TMC248-LA-X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- -
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (4)
- Interface:
- SPI
- Technology:
- HVCMOS
- Step Resolution:
- 1 ~ 1/64
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Voltage - Load:
- 7V ~ 34V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
TMC248-LA-X FAQ
1.How can I place an order for TMC248-LA-X through Aetrix?
Please submit a Request for Quotation (RFQ) for TMC248-LA-X 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 TMC248-LA-X reliable?
The price and inventory of TMC248-LA-X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMC248-LA-X is usually 5 days.
3.What payment methods are accepted for TMC248-LA-X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMC248-LA-X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMC248-LA-X?
TMC248-LA-X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMC248-LA-X 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 TMC248-LA-X?
For technical support, including TMC248-LA-X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMC248-LA-X requirements.
6.How does Aetrix verify that TMC248-LA-X is sourced from the original manufacturer or authorized distributors?
All TMC248-LA-X 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 TMC248-LA-X meets industry standards.
7.What is the process for return or replacement of TMC248-LA-X?
All TMC248-LA-X units undergo pre-shipment inspection (PSI). If there is an issue with TMC248-LA-X, 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 TMC248-LA-X part is unused and in its original packaging.
Return procedure for TMC248-LA-X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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