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Analog Devices Inc./Maxim Integrated TMC248-LA
- Part No.:
- TMC248-LA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Motor Drivers, Controllers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
TMC248-LA.pdf
- Description:
- IC MTR DRVR BIPOLAR 3-5.5V 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,717
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Product details
Overview
TMC248-LA from TRINAMIC Motion Control GmbH & Co. KG is a dual full-bridge stepper motor driver IC designed to control two-phase bipolar stepper motors using eight external MOSFETs. It delivers up to 7 A motor current, supports 7–36 V DC motor supply, operates with 3.3 V or 5 V digital logic, and enables 64× microstepping with stallGuard™ sensorless load measurement - used in textile machinery, lab automation, and antenna positioning systems.
For engineers reviewing the TMC248-LA datasheet, TMC248-LA pinout, TMC248-LA application, or TMC248-LA equivalent, key selection considerations include its QFN28 package size (5 × 5 mm), SPI + analog dual-control interface, mixed-decay chopper operation, slope-controlled EMI reduction, and integrated diagnostics for overtemperature, open-load, and overcurrent conditions.
Technical Context
The TMC248-LA implements a HVCMOS-based dual full-bridge gate driver architecture with internal 4-bit DACs per coil, enabling precise sine-wave current profiling for smooth microstepping. Its chopper control supports voltage PWM mode with blank time adjustment, mixed decay configuration, and oscillator-synchronized timing via internal or external clock source.
It integrates stallGuard™-a sensorless stall detection system based on back-EMF analysis-delivering a 3-bit load indicator updated once per full step. Diagnostics include real-time flags for overtemperature prewarning (OTPW), open-load (OLA/OLB), and undervoltage (UV), all accessible via SPI status word or dedicated ERR pin in standalone mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Current | Up to 7 A via external MOSFETs - enables high-torque motion in compact systems without integrated power stage limitations. |
| Supply Voltage Range | 7–36 V DC for motor (VS); 3.0–5.5 V DC for logic (VCC) - supports wide industrial input rails and simplifies auxiliary supply design. |
| Microstep Resolution | Up to 64 microsteps per full step - achieved via SPI-programmed 4-bit DAC values per coil, enabling sub-degree positioning accuracy. |
| stallGuard™ Output | 3-bit load indicator (LD2–LD0) - provides real-time mechanical load feedback without sensors, usable for homing and overload prediction. |
| Protection Features | Overvoltage (via ENN), overtemperature (OT/OTPW), short-circuit, open-load (OLA/OLB), and undervoltage (UV) - reduces system-level fault handling burden. |
| Control Interfaces | SPI serial (12-bit command/status) and analog/digital standalone mode - allows flexible integration with microcontrollers or legacy analog control systems. |
| Package | QFN28, 5 × 5 mm², exposed thermal pad - supports high-power density PCB layouts with efficient heat dissipation to ground plane. |
Pinout & Package
Package: QFN28, 5 × 5 mm², 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 P-channel gate drivers | Drive external high-side MOSFETs for coil A/B; require bootstrap or charge-pump support for full N-channel compatibility. |
| LA1, LA2, LB1, LB2 | Low-side N-channel gate drivers | Directly drive external low-side N-MOSFETs; compatible with standard logic-level gate thresholds. |
| SRA, SRB | Current sense resistor inputs | Connect to shunt resistors between low-side MOSFETs and GND; feed current-sense comparators for chopper control. |
| INA, INB | Analog current reference inputs | Accept 0–3 V analog voltage to scale DAC full-scale output; enable fine-grained current tuning across motor variants. |
| CSN, SCK, SDI, SDO, SPE | SPI interface signals | Enable 12-bit synchronous serial communication; SPE high selects SPI mode, CSN active-low initiates transaction. |
| ENN | Enable / Overvoltage shutdown input | Active-low enable; pulled high disables chip and triggers overvoltage protection - critical for safe VS rail monitoring. |
| ANN | Analog control enable | Low-active signal enabling INA/INB analog current control; tied low in SPI mode to use external reference scaling. |
| OSC | Oscillator capacitor connection | Connects external capacitor (e.g., 680 pF) to set chopper frequency; determines PWM switching rate and current regulation stability. |
Key Features
| Feature | Design Value |
|---|---|
| stallGuard™ sensorless stall detection | Delivers 3-bit load indicator via SPI or ERR pin - eliminates need for physical endstops in homing routines and enables predictive maintenance. |
| Mixed decay chopper control | Configurable per-coil decay mode - reduces torque ripple and audible noise during microstepping, especially at mid-speed ranges. |
| Slope control (SLP/BL1/BL2) | Adjustable slew-rate limiting on gate drivers - suppresses electromagnetic emissions without external snubbers or ferrites. |
| Low-noise voltage PWM chopper | Supports clean commutation in standalone mode using MCU PWM inputs - achieves smooth motion even at 64× microstepping. |
| Dual control modes (SPI + analog) | Enables migration path from legacy analog systems to digital control - same hardware supports both firmware-upgradable and fixed-function designs. |
Applications
| Textile & Sewing Machines | Lab Automation & Liquid Handling |
|---|---|
|
Use Scenario: Precision needle positioning and thread tension control in high-speed industrial sewing heads. IC Role / Device Role / Timing Role: Dual full-bridge driver executing 64× microstepped motion profiles with stallGuard™-based thread-break detection. Use Value: Eliminates mechanical limit switches and reduces downtime from thread jams via real-time load monitoring and automatic stall recovery. |
Use Scenario: Accurate pipette actuation and reagent dispensing in automated liquid handlers. IC Role / Device Role / Timing Role: Stepper driver managing bidirectional syringe movement with microsecond-level current control via SPI. Use Value: Enables repeatable ±0.5 µL dispensing accuracy through stable 7 A peak current delivery and thermal-safe standby current reduction. |
| Antenna Positioning Systems | Office Automation (Printers/Scanners) |
|
Use Scenario: Solar tracker azimuth/elevation adjustment under variable wind and thermal loads. IC Role / Device Role / Timing Role: High-power stepper driver with overtemperature prewarning (OTPW) and open-load diagnostics for remote reliability. Use Value: Prevents mechanical damage by halting motion before thermal shutdown, using stallGuard™ to detect binding before stall occurs. |
Use Scenario: Paper feed, scanner carriage, and duplex module actuation in multifunction printers. IC Role / Device Role / Timing Role: Compact QFN28 driver delivering quiet, vibration-free motion via mixed-decay chopper and slope control. Use Value: Reduces acoustic noise below 35 dB(A) and meets CISPR-22 Class B EMI limits without added shielding components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMC249-LA | Same pinout, identical feature set, but rated for 5 A (vs. 7 A) motor current and lower RDS(on) gate drive strength. | Better suited for cost-sensitive, lower-power applications where 5 A suffices and thermal margin is less constrained. | Select TMC249-LA when board space and firmware compatibility are prioritized over maximum current capability. |
| DRV8825 | Integrated MOSFETs (1.75 A RMS), no external FET support, lacks stallGuard™ and analog current control interface. | Targeted at entry-level motion control where simplicity and BOM count outweigh advanced diagnostics and scalability. | Choose DRV8825 only for low-current, space-constrained designs where sensorless stall detection and external MOSFET flexibility are not required. |
Compared with TMC249-LA, the TMC248-LA offers higher current headroom and thermal robustness for demanding industrial loads; versus DRV8825, it trades integration for field-serviceable power stages and embedded intelligence - making it optimal for scalable, high-reliability multi-motor systems.
Availability
TMC248-LA is available at Aetrix Electronics and suitable for textile machinery, lab automation, antenna positioning, and office equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TMC248-LA 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 intelligent motion control ICs, founded in Hamburg in 1997 and focused on high-precision, low-noise motor driver solutions.
The TMC248-LA belongs to TRINAMIC's high-power external-FET stepper driver product line, engineered for miniaturized, thermally efficient motion systems where sensorless diagnostics, flexible control interfaces, and scalable current delivery are essential.
FAQ
What is the maximum motor current supported by the TMC248-LA?
The TMC248-LA supports up to 7 A motor current when paired with appropriately rated external MOSFETs and proper PCB thermal design. This rating assumes adequate copper area, thermal vias to inner ground planes, and ambient temperature ≤ 85°C. The actual achievable current depends on MOSFET RDS(on), layout, and heatsinking - the TMC248-LA itself does not limit current but controls gate drive timing and protection logic.
Does the TMC248-LA integrate power MOSFETs?
No, the TMC248-LA does not integrate power MOSFETs. It is a gate driver IC that controls eight external MOSFETs - four high-side P-channel and four low-side N-channel devices - allowing system designers to select FETs optimized for voltage, current, and thermal requirements. This architecture enables scalable power delivery while maintaining a compact 5 × 5 mm QFN28 footprint.
How does stallGuard™ work on the TMC248-LA?
stallGuard™ on the TMC248-LA measures motor load sensorlessly by analyzing back-EMF-induced voltage variations across the motor coils during motion. It outputs a 3-bit load indicator (LD2–LD0) updated once per full step, where lower values indicate higher mechanical load. The feature requires sine-wave commutation and mixed decay disabled near zero-crossing to ensure accuracy - and is accessed via SPI status word or ERR pin in standalone mode.
Can the TMC248-LA operate without an external microcontroller?
Yes, the TMC248-LA supports standalone mode using analog current control (INA/INB) and digital phase signals (PHA/PHB), eliminating the need for SPI initialization. In this mode, internal DACs default to full scale (1111), and features like stallGuard™ and diagnostics remain functional. Pin SPE must be tied to GND, and ANN used to enable analog control - enabling simple, deterministic motion control with minimal firmware overhead.
What protection functions are built into the TMC248-LA?
The TMC248-LA integrates overtemperature (OT/OTPW), overvoltage (via ENN pin), undervoltage (UV), overcurrent (OCA/OCB/OCHS), and open-load (OLA/OLB) protection. All are continuously monitored and reported via SPI status bits or ERR pin assertion. Thermal protection includes prewarning (OTPW) at 130°C and shutdown at 150°C, while overvoltage detection disables the driver if VS exceeds safe threshold - ensuring robust operation in unregulated industrial environments.
TMC248-LA 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 FAQ
1.How can I place an order for TMC248-LA through Aetrix?
Please submit a Request for Quotation (RFQ) for TMC248-LA 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 reliable?
The price and inventory of TMC248-LA 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 is usually 5 days.
3.What payment methods are accepted for TMC248-LA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMC248-LA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMC248-LA?
TMC248-LA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMC248-LA 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?
For technical support, including TMC248-LA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMC248-LA requirements.
6.How does Aetrix verify that TMC248-LA is sourced from the original manufacturer or authorized distributors?
All TMC248-LA 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 meets industry standards.
7.What is the process for return or replacement of TMC248-LA?
All TMC248-LA units undergo pre-shipment inspection (PSI). If there is an issue with TMC248-LA, 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 part is unused and in its original packaging.
Return procedure for TMC248-LA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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