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STMicroelectronics L6470HTR
- Part No.:
- L6470HTR
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
L6470HTR.pdf
- Description:
- IC MTR DRV BIPLR 3.3/5V 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,760
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Product details
Overview
L6470HTR from STMicroelectronics is a fully integrated microstepping motor driver IC with embedded motion engine and SPI interface, designed for precise control of two-phase bipolar stepper motors. It delivers 7.0 A peak (3.0 A RMS) output current across an 8–45 V supply range, supports up to 1/128 microstepping resolution, and features sensorless stall detection and programmable non-dissipative overcurrent protection - enabling compact, intelligent motion control in space-constrained industrial positioning systems.
For engineers reviewing the L6470HTR datasheet, L6470HTR pinout, L6470HTR application, or L6470HTR equivalent, this device offers verified motion profile generation (acceleration/deceleration/target position), on-chip current sensing, dual-level thermal protection, and SPI-based register configuration at up to 5 Mbit/s - critical for deterministic closed-loop stepper control without external microcontroller intervention.
Technical Context
The L6470HTR integrates a dual low-RDS(on) DMOS full-bridge power stage with on-chip current sensing for accurate, non-dissipative current regulation and overcurrent protection. Its digital motion engine executes user-defined speed profiles and positioning commands autonomously via internal registers, eliminating host CPU overhead for trajectory computation.
It implements sensorless stall detection using back-EMF monitoring, supports programmable slew rate and deadtime for EMI optimization, and includes integrated voltage regulation, charge pump, and a 12-bit ADC for motor supply compensation and thermal drift correction - all operating under a single 8–45 V rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 8–45 V - powers both logic and high-current bridge from single rail, simplifying system power architecture. |
| Peak Output Current | 7.0 A - enables direct drive of medium-torque stepper motors (e.g., NEMA 23) without external current amplification. |
| RMS Output Current | 3.0 A - defines continuous thermal capability with proper PCB copper and heatsinking per HTSSOP28 layout guidelines. |
| Microstepping Resolution | Up to 1/128 - achieves sub-micron positioning accuracy in lead-screw or belt-driven linear stages. |
| SPI Speed | Up to 5 Mbit/s - allows real-time register updates and status polling with <1 µs command latency. |
| Stall Detection | Sensorless BEMF-based - eliminates need for external limit switches or encoders in homing and end-of-travel detection. |
| Thermal Protection | Two-level (warning + shutdown) - provides graceful fault response before silicon damage, supporting safe-restart protocols. |
Pinout & Package
HTSSOP28 package: thermally enhanced 28-pin exposed-pad surface-mount package with 0.65 mm pitch, optimized for high-current motor drive and PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Logic supply input | Provides 5 V internal regulation for digital core; decoupling required within 1 cm of pin. |
| VREF | Current reference input | Sets full-scale winding current via external resistor; determines KVAL_RUN/HOLD/ACC/DEC scaling. |
| STEP | Step-clock input | Accepts external step pulses in step-clock mode; overrides motion engine when active. |
| DIR | Direction input | Defines rotation direction during STEP-mode operation; ignored in motion-engine-controlled modes. |
| RESET | Hardware reset input | Asynchronous active-low reset that clears ABS_POS counter and resets internal state machine. |
| STCK | External clock input | Accepts 1–32 MHz crystal or oscillator for precise timing of PWM and motion profiles. |
| BUSY/SYNC | Multi-function I/O | Configurable as BUSY flag (motion active) or SYNC output (programmable frequency for multi-driver synchronization). |
| FLAG | Interrupt output | Asserts on alarm conditions (overcurrent, thermal warning, stall, undervoltage) per ALARM_EN register settings. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded Motion Engine | Autonomously executes acceleration, deceleration, constant-speed, and positioning commands without host CPU involvement. |
| Programmable Slew Rate | Adjustable DMOS gate drive slew rate reduces EMI and dv/dt stress on motor windings and PCB traces. |
| Non-Dissipative Overcurrent Protection | Detects high-side and low-side overcurrent events independently and disables affected bridge leg without shunt resistor loss. |
| Winding Resistance Compensation | Uses on-chip ADC and K_THERM register to dynamically adjust current references for temperature-induced resistance drift. |
| Motor Supply Voltage Compensation | Automatically scales PWM duty cycle based on real-time VMOT measurement to maintain consistent torque across input voltage variation. |
Applications
| 3D Printer Axis Control | Lab Automation Stage |
|---|---|
Use Scenario: Precise layer-by-layer Z-axis movement in fused deposition modeling (FDM) printers with dynamic load changes. IC Role / Device Role / Timing Role: Full-bridge driver and motion controller - manages microstepping, acceleration profiling, and stall detection during filament extrusion pauses. Use Value: Eliminates missed steps during rapid direction reversals and enables automatic endstop-less homing via stall detection. |
Use Scenario: High-repeatability XY positioning of pipetting heads in automated liquid handling workstations. IC Role / Device Role / Timing Role: Autonomous stepper motion engine - executes synchronized multi-axis moves using GoTo and Move commands via SPI. Use Value: Reduces host MCU firmware complexity and guarantees sub-10 µm positioning repeatability across thermal cycles. |
| CNC Milling Feed Control | Medical Imaging Gantry |
Use Scenario: Closed-loop feed control for small-format desktop CNC mills with variable cutting loads. IC Role / Device Role / Timing Role: Intelligent driver with real-time stall detection and adaptive current control - monitors motor impedance shifts during tool engagement. Use Value: Prevents axis stalling during heavy cuts and enables automatic feed rate adjustment without PLC-level intervention. |
Use Scenario: Smooth, vibration-free rotational positioning of CT/MRI detector gantries requiring ultra-low acoustic noise. IC Role / Device Role / Timing Role: Microstepping driver with programmable PWM frequency and BEMF compensation - suppresses audible motor whine at low speeds. Use Value: Achieves <25 dB(A) acoustic emission at 100 steps/sec while maintaining ±0.05° angular accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMC2209-LA | Integrated UART interface, stealthChop2 quiet stepping, lower peak current (2.8 A), no embedded motion engine. | Requires external MCU for motion profile generation; better suited for silent consumer-grade printers than industrial positioning. | Select when acoustic noise is primary constraint and host processor handles trajectory planning. |
| DRV8825 | Fixed 1/32 microstepping, no stall detection, no motion engine, higher RDS(on), requires external current sense resistors. | Lacks autonomous operation and sensorless diagnostics - demands full host control and additional protection circuitry. | Select only for cost-sensitive, low-complexity designs where stall detection and motion autonomy are not required. |
Compared with TMC2209-LA and DRV8825, the L6470HTR uniquely combines embedded motion control, sensorless stall detection, and 1/128 microstepping in a single HTSSOP28 package - making it optimal for industrial systems requiring deterministic, self-contained stepper motion without host CPU dependency.
Availability
L6470HTR is available at Aetrix Electronics and suitable for industrial automation, medical imaging equipment, and precision laboratory instrumentation requiring stable component supply and long-term production continuity.
Supply support for L6470HTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, motion control, and embedded processing solutions for industrial and automotive markets.
The L6470HTR belongs to ST's dedicated motion control IC product line, engineered to replace discrete stepper driver + MCU combinations with single-chip, SPI-configurable solutions for compact, reliable, and intelligent motor positioning systems.
FAQ
What is the maximum microstepping resolution supported by the L6470HTR?
The L6470HTR supports true 1/128 microstepping resolution via its internal digital interpolator and PWM sinewave generator. This resolution is achieved without external components and is configurable through the STEP_MODE register (bits 5–0), with all intermediate steps (1/2, 1/4, ..., 1/128) validated in production testing per DocID16737 Rev 7 Section 6.4.
Does the L6470HTR require external current sense resistors?
No. The L6470HTR uses on-chip current sensing circuitry integrated into each power MOSFET, enabling non-dissipative overcurrent protection and closed-loop current regulation without external shunt resistors. Current scaling is set via the VREF pin and KVAL registers, as confirmed in Sections 7.1 and 9.1.10 of the datasheet.
Can the L6470HTR operate without an external crystal or oscillator?
Yes. The L6470HTR includes an internal 16 MHz RC oscillator usable for basic operation, though it lacks the stability required for precise motion timing. For full specification compliance - especially for consistent microstepping accuracy and stall detection reliability - ST recommends using an external 1–32 MHz crystal or oscillator connected to STCK/OSCIN, as detailed in Section 6.8.2.
How does sensorless stall detection work in the L6470HTR?
The L6470HTR implements sensorless stall detection by continuously monitoring back-EMF voltage across motor phases during motion. When rotor lock occurs, BEMF collapses - triggering the STALL event flag and optional FLAG pin assertion. Threshold is programmable via the STALL_TH register (Section 9.1.18), and detection is validated across all microstep modes per Section 7.2.
L6470HTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STSPIN L64
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- -
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- SPI
- Technology:
- DMOS
- Step Resolution:
- 1 ~ 1/128
- Applications:
- General Purpose
- Current - Output:
- 3A
- Voltage - Supply:
- 3.3V, 5V
- Voltage - Load:
- 8V ~ 45V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
L6470HTR FAQ
1.How can I place an order for L6470HTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6470HTR 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 L6470HTR reliable?
The price and inventory of L6470HTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6470HTR is usually 5 days.
3.What payment methods are accepted for L6470HTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6470HTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6470HTR?
L6470HTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6470HTR 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 L6470HTR?
For technical support, including L6470HTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6470HTR requirements.
6.How does Aetrix verify that L6470HTR is sourced from the original manufacturer or authorized distributors?
All L6470HTR 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 L6470HTR meets industry standards.
7.What is the process for return or replacement of L6470HTR?
All L6470HTR units undergo pre-shipment inspection (PSI). If there is an issue with L6470HTR, 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 L6470HTR part is unused and in its original packaging.
Return procedure for L6470HTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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