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Analog Devices Inc./Maxim Integrated TMC248-LA-T
- Part No.:
- TMC248-LA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Motor Drivers, Controllers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
TMC248-LA-T.pdf
- Description:
- IC MTR DRVR BIPOLAR 3-5.5V 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,578
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Product details
Overview
TMC248-LA-T 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-T datasheet, TMC248-LA-T pinout, TMC248-LA-T application, or TMC248-LA-T 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-T implements a HVCMOS-based dual full-bridge gate driver architecture with eight dedicated outputs (HA1/HA2/HB1/HB2/LA1/LA2/LB1/LB2) for driving external P- and N-channel MOSFETs. Its chopper control uses voltage PWM with adjustable blank time (BL1/BL2), mixed decay configuration (MDA/MDB), and oscillator-synchronized timing via internal or external clock on OSC pin.
It embeds real-time diagnostics including overtemperature (OT/OTPW), undervoltage (UV), open-load detection (OLA/OLB), and overcurrent (OCA/OCB/OCHS) reporting via SPI status word or ERR pin. StallGuard™ derives mechanical load from back-EMF analysis during sine-commutated motion, delivering a 3-bit unsigned load indicator updated once per full step.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Current | Up to 7 A via external MOSFETs - enables high-torque operation without integrated power stage thermal limits. |
| Supply Voltage Range | 7 V–36 V DC for motor (VS); 3.0 V–5.5 V DC for logic (VCC) - supports wide industrial input rails and LDO-compatible digital supply. |
| Microstep Resolution | Up to 64 microsteps per full step - achieved via SPI-programmed 4-bit DACs per coil, enabling smooth low-speed motion and precise positioning. |
| stallGuard™ Output | 3-bit unsigned load indicator (LD2–LD0) - provides real-time stall detection and reference search without external sensors or switches. |
| Protection Features | Overvoltage (ENN shutdown), overtemperature (OT/OTPW flags), short-circuit (OCA/OCB/OCHS), open-load (OLA/OLB) - ensures robust field operation with fault logging via SPI or ERR pin. |
| Control Interfaces | SPI (12-bit command/status) and analog standalone mode (INA/INB current control + PHA/PHB polarity) - allows firmware-driven tuning or legacy hardware compatibility. |
| Package | QFN28, 5 mm × 5 mm, exposed thermal pad - supports compact PCB layout and efficient heat dissipation when mounted to ground plane. |
Pinout & Package
Package: QFN28, 5 mm × 5 mm, 0.5 mm pitch, thermally enhanced exposed die attach pad (to be connected to GND plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HA1, HA2, HB1, HB2 | High-side P-channel gate drivers | Drive upper MOSFETs of each H-bridge; require external pull-up for proper turn-off timing. |
| LA1, LA2, LB1, LB2 | Low-side N-channel gate drivers | Drive lower MOSFETs; sink current during active PWM periods; BL1/BL2 set blank time to prevent shoot-through. |
| SRA, SRB | Current sense comparator inputs | Connect to shunt resistors between low-side MOSFETs and GND; trip threshold scales with INA/INB voltage or internal 2 V reference. |
| INA, INB | Analog current reference inputs | Set base current scale (0–3 V); 2 V yields 100% DAC range; enables motor-specific current calibration without SPI reprogramming. |
| PHA, PHB | Digital phase polarity controls | In standalone mode, define current direction per bridge (0 = OA1→OA2); in SPI mode, controlled by PHA/PHB bits in command word. |
| CSN, SCK, SDI, SDO, SPE | SPI interface signals | Standard 4-wire SPI plus enable (SPE); CSN-active transaction transfers 12-bit command and returns 12-bit status with diagnostics and stallGuard™ bits. |
| ENN | Enable/shutdown input | Active-low device enable; high forces shutdown mode (all references off, SPI reset); low enables operation and overvoltage protection. |
| ERR | Open-drain error output | Asserts high on overtemperature, overcurrent, or open-load - usable for system-level fault interrupt without SPI polling. |
Key Features
| Feature | Design Value |
|---|---|
| stallGuard™ sensorless load detection | Enables reliable homing and stall monitoring using motor back-EMF - eliminates need for mechanical limit switches in lab automation and antenna positioning. |
| Mixed decay chopper control | Reduces torque ripple and audible noise by dynamically blending fast/slow decay - critical for smooth motion in office automation and medical devices. |
| Slope control (SLP pin) | Adjusts gate drive slew rate to suppress EMI emissions - simplifies EMC compliance in CCTV and POS terminals without added filtering components. |
| Dual control modes (SPI + analog) | Supports both microcontroller-based parameter tuning and legacy analog interface - facilitates migration from older bipolar drivers while preserving software investment. |
| Standby and shutdown modes | Reduces quiescent current to <100 µA in shutdown - extends battery life in portable pumps and valves where motors idle for extended periods. |
Applications
| Lab Automation | Antenna Positioning |
|---|---|
Use Scenario: Precise liquid dispensing and pipetting in automated workstations requiring repeatable sub-microliter accuracy. IC Role / Device Role / Timing Role: Dual full-bridge gate driver controlling external MOSFETs to deliver 7 A peak current to high-inductance stepper motors driving syringe pumps. Use Value: stallGuard™ enables automatic reference search without end-stop switches, reducing mechanical complexity and improving long-term reliability in sealed fluidic enclosures. | Use Scenario: Solar tracking systems requiring accurate azimuth/elevation adjustment under variable wind loads and temperature gradients. IC Role / Device Role / Timing Role: Stepper motor driver with real-time load monitoring and mixed-decay chopper, interfaced via SPI to motion controller (e.g., TMC429) for multi-axis coordination. Use Value: 64× microstepping + slope control minimizes vibration-induced pointing error and EMI interference with RF receivers on the same platform. |
| Office Automation | Medical Devices |
Use Scenario: High-speed paper feed and document scanning in multifunction printers where quiet, jitter-free motion is essential. IC Role / Device Role / Timing Role: Analog standalone-mode driver using INA/INB for adaptive current scaling and PHA/PHB for step/direction control from MCU GPIOs. Use Value: Low-noise voltage PWM chopper eliminates audible coil whine during low-speed scanning, meeting acoustic emission requirements for office environments. | Use Scenario: Portable diagnostic analyzers requiring compact, low-power motor actuation for sample carousel and reagent valve control. IC Role / Device Role / Timing Role: Gate driver operating in standby mode between assay steps; activated via ENN for burst motion with stallGuard™-verified positioning. Use Value: Shutdown mode draws <100 µA, extending single-charge battery life beyond 48 hours - critical for field-deployable medical hardware. |
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 higher-side gate drive; supports 100% duty cycle operation. | Better suited for high-duty-cycle applications like continuous rotation or holding torque under thermal stress. | Select TMC249-LA if external MOSFETs require boosted gate drive above VS or if >95% duty cycle is needed. |
| DRV8825 | Integrated MOSFETs (1.75 A RMS), no external FET support; fixed 32× microstepping; lacks stallGuard™ and analog current control. | Targeted at lower-current, cost-sensitive designs where board space is constrained and sensorless load detection is unnecessary. | Choose DRV8825 only for ≤2 A motors and when external MOSFET flexibility and stallGuard™ are not required. |
Compared with TMC249-LA, the TMC248-LA-T offers identical interface and diagnostics but requires external charge pump circuitry for 100% duty cycle; versus DRV8825, it trades integrated power stage for scalable current delivery and advanced motion intelligence - making it optimal for high-reliability, high-power, sensorless-stepper systems.
Availability
TMC248-LA-T is available at Aetrix Electronics and suitable for lab automation liquid handling, antenna positioning systems, office automation printers, and medical diagnostic equipment requiring stable component supply across multi-year production cycles.
Supply support for TMC248-LA-T 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 motor control ICs, known for innovations in stealthChop, spreadCycle, and stallGuard™ technologies.
The TMC248 product line was engineered to deliver high-power-density stepper gate drivers with embedded motion intelligence - targeting applications demanding silent, precise, and self-monitoring motion control without external sensors or complex firmware.
FAQ
What is the maximum motor current supported by the TMC248-LA-T?
The TMC248-LA-T supports up to 7 A motor current when paired with appropriately rated external MOSFETs and heatsinking. This rating assumes proper PCB layout (including thermal pad grounding), adequate copper area, and operation within the 7–36 V DC VS supply range. The actual achievable current depends on MOSFET RDS(on), ambient temperature, and switching frequency - the TMC248-LA-T itself does not limit current; it drives the gates to realize the external FETs' capability.
Does the TMC248-LA-T include integrated MOSFETs?
No, the TMC248-LA-T is a gate driver IC only and does not include integrated power MOSFETs. It provides eight dedicated gate drive outputs (HA1/HA2/HB1/HB2/LA1/LA2/LB1/LB2) to control external high-efficiency P- and N-channel MOSFETs. This architecture enables scalable current delivery, thermal separation, and optimization for specific motor voltage/current requirements - unlike monolithic drivers such as the DRV8825.
How does stallGuard™ work on the TMC248-LA-T?
stallGuard™ on the TMC248-LA-T performs sensorless load detection by analyzing back-EMF signatures during sine-wave commutation. It outputs a 3-bit unsigned value (LD2–LD0) updated once per full step, where '0' indicates imminent stall and '7' reflects minimal load. Reliable operation requires disabling mixed decay near zero-crossing and using medium motor velocity away from resonance - the TMC248-LA-T computes and reports this value internally without external components.
Can the TMC248-LA-T operate without an SPI interface?
Yes, the TMC248-LA-T supports standalone (non-SPI) mode by tying SPE to GND. In this mode, pins SCK, SDI, CSN, and SDO repurpose as MDBN, PHA, PHB, and ERR respectively, while INA/INB accept analog voltage (0–3 V) to set base current scale. This allows direct MCU GPIO or DAC control of motor phase and current - ideal for legacy designs or resource-constrained microcontrollers lacking SPI peripherals.
What protection features are built into the TMC248-LA-T?
The TMC248-LA-T integrates overtemperature (OT/OTPW), overvoltage (via ENN shutdown), undervoltage (UV), open-load (OLA/OLB), and overcurrent (OCA/OCB/OCHS) protection. All faults generate diagnostic flags readable via SPI status word or asserted on the ERR pin. These protections operate independently of control mode (SPI or standalone) and do not require configuration - they activate automatically to safeguard both the IC and external MOSFETs during abnormal conditions.
TMC248-LA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for TMC248-LA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for TMC248-LA-T 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-T reliable?
The price and inventory of TMC248-LA-T 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-T is usually 5 days.
3.What payment methods are accepted for TMC248-LA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMC248-LA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMC248-LA-T?
TMC248-LA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMC248-LA-T 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-T?
For technical support, including TMC248-LA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMC248-LA-T requirements.
6.How does Aetrix verify that TMC248-LA-T is sourced from the original manufacturer or authorized distributors?
All TMC248-LA-T 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-T meets industry standards.
7.What is the process for return or replacement of TMC248-LA-T?
All TMC248-LA-T units undergo pre-shipment inspection (PSI). If there is an issue with TMC248-LA-T, 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-T part is unused and in its original packaging.
Return procedure for TMC248-LA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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