Analog Devices Inc./Maxim Integrated TMC2208-LA-T

Overview

TMC2208-LA-T from TRINAMIC Motion Control GmbH & Co. KG is a two-phase bipolar stepper motor driver IC with integrated power MOSFETs, supporting up to 1.4 A RMS (2 A peak) coil current, 4.75–36 V DC supply, and QFN28 wettable flanks package. It implements StealthChop2™ for silent low-velocity operation and SpreadCycle™ for high-dynamic motion control, and features UART-based configuration and diagnostics in 3.3/5 V I/O systems.

For engineers reviewing the TMC2208-LA-T datasheet, TMC2208-LA-T pinout, TMC2208-LA-T application, or TMC2208-LA-T equivalent, key selection criteria include microstepping resolution (2–256 via MicroPlyer™), internal sense resistor option, automatic standstill current reduction, passive braking capability, and compatibility with STEP/DIR legacy interfaces in compact embedded motion systems.

Technical Context

The TMC2208-LA-T integrates dual full-bridge power stages with typical R_DS(on) of 280 mΩ (LS) and 290 mΩ (HS) at 25°C, enabling efficient drive of 2-phase stepper motors without external sense resistors when configured for internal sensing. Its chopper architecture supports concurrent StealthChop2™ (voltage-mode, auto-tuning, silent standstill) and SpreadCycle™ (current-mode, cycle-by-cycle regulation) modes, selectable via UART or pin configuration.

It operates in three functional modes: standalone STEP/DIR (with MS1/MS2 pin-set microstep resolution), OTP-preconfigured mode (for fixed application tuning), and full UART-controlled mode (enabling 256 microsteps, dynamic current scaling, thermal diagnostics, and internal pulse generation). The PDN_UART pin serves dual function - automatic standby current reduction or UART I/O - with automatic baud-rate detection from 9.6 kbps to 500 kbps.

Key Specifications

Pinout & Package

Package: QFN28, 5 mm × 5 mm, 0.5 mm pitch, wettable flanks, exposed thermal pad (GND-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stepper motor driver applications.

Compared with TMC2208-LA-T, TMC2208-LA offers identical performance in tray packaging for prototyping, while TMC2224-LA-T provides hardware chopper mode selection at the cost of losing the INDEX output - making TMC2208-LA-T optimal for applications needing precise homing feedback and full UART configurability.

Availability

TMC2208-LA-T is available at Aetrix Electronics and suitable for 3D printer motion control, POS terminal paper feed, and HVAC damper actuation requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for TMC2208-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 high-precision motion control ICs, founded in Hamburg in 1997 and focused on silent, efficient, and intelligent motor drive solutions.

The TMC22xx product line was designed specifically for cost-sensitive, space-constrained stepper motor applications requiring ultra-quiet operation, integrated power stages, and flexible interface options - targeting 3D printing, office automation, and embedded motion markets.

FAQ

What is the maximum motor current supported by the TMC2208-LA-T?

The TMC2208-LA-T supports up to 2 A peak coil current and 1.4 A RMS continuous current. This rating assumes proper PCB thermal design - including ≥6 thermal vias under the exposed die pad connected to a solid GND plane - and operation within the specified 4.75–36 V supply range. Derating applies above 70°C ambient temperature per the datasheet's thermal characteristics table.

Does the TMC2208-LA-T require external current-sense resistors?

No, the TMC2208-LA-T supports internal sense resistor operation, eliminating the need for external sense resistors. When enabled via register configuration, it uses on-chip current mirrors referenced to the VREF pin, achieving ±5% current accuracy. External sense resistors remain optional for higher precision or specific layout constraints, with recommended values of 0.1 Ω for 1.4 A RMS operation.

How does StealthChop2™ differ from standard chopper modes in the TMC2208-LA-T?

StealthChop2™ is an auto-tuning voltage-mode chopper that eliminates audible motor noise at standstill and low speeds without configuration. Unlike fixed-frequency PWM or current-mode choppers, it dynamically adjusts switching frequency and modulation to suppress mechanical resonance and electromagnetic emissions. In the TMC2208-LA-T, StealthChop2™ activates automatically on power-up and requires no register writes - making it ideal for plug-and-play silent motion.

Can the TMC2208-LA-T operate without a microcontroller?

Yes, the TMC2208-LA-T supports standalone operation using STEP/DIR signals alone. With MS1/MS2 pins configured, it executes microstepping and current control autonomously. An internal step pulse generator (accessible via UART) also allows velocity-based motion without external STEP pulses - though ramping must be handled externally. Full diagnostics and advanced tuning still require UART communication.

What package type and thermal considerations apply to the TMC2208-LA-T?

The TMC2208-LA-T uses a QFN28 package (5 mm × 5 mm, 0.5 mm pitch) with wettable flanks and an exposed thermal pad. For reliable thermal performance, the pad must be soldered to a dedicated GND plane with ≥6 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). Layout guidelines specify short, wide traces for VS, OA1/OA2, OB1/OB2, and direct capacitor connections to minimize inductance and ensure stable operation at 2 A peak current.