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STMicroelectronics L6470PDTR
- Part No.:
- L6470PDTR
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- Datasheet:
-
L6470PDTR.pdf
- Description:
- IC MTR DRV BIPLR 3.3V/5V 36PWRSO
- Quantity:
- Payment:
- Shipping:
Inventory:317
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Product details
Overview
L6470PDTR 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 automated optical alignment systems.
For engineers reviewing the L6470PDTR datasheet, L6470PDTR pinout, L6470PDTR application, or L6470PDTR equivalent, this page provides verified technical context, validated pin functions, confirmed motion-engine capabilities, and real-world application constraints - all derived from ST's production-grade documentation (DocID16737 Rev 7).
Technical Context
The L6470PDTR integrates dual low-RDS(on) DMOS full bridges with on-chip current sensing for accurate, non-dissipative current regulation and overcurrent protection. Its digital motion engine executes user-defined acceleration/deceleration profiles, absolute positioning, and speed commands via SPI register writes - eliminating external microcontroller motion logic.
It implements sensorless stall detection by monitoring back-EMF-induced current decay asymmetry, supports programmable slew rate and deadtime for EMI control, and includes dual-level thermal protection (warning + shutdown) plus undervoltage lockout - ensuring robust operation in closed-loop industrial actuators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 8–45 V - supports wide-input industrial DC bus and battery-powered motion systems without external regulators. |
| Peak Output Current | 7.0 A - enables direct drive of NEMA 23-class stepper motors at high torque without external gate drivers. |
| RMS Output Current | 3.0 A - defines continuous thermal limit under 1/128 microstepping with typical PCB copper area. |
| Microstepping Resolution | Up to 1/128 - achieves sub-micron positioning accuracy in precision lab equipment and medical dispensers. |
| SPI Interface Speed | 5 Mbit/s - allows real-time motion profile updates and status polling within <200 µs command latency. |
| Stall Detection | Sensorless - eliminates need for external position sensors or current shunts in space-constrained applications. |
| Thermal Protection | Two-level (warning + shutdown) - provides early fault indication and safe power-down before junction damage. |
Pinout & Package
Package: POWERSO36 - thermally enhanced power SO package with exposed die pad for high-current motor drive dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Digital supply input | 5 V logic supply; powers internal registers, SPI interface, and motion engine core. |
| VCC | Analog & power stage supply | 8–45 V motor supply input; feeds charge pump and DMOS bridges directly. |
| OUT1A–OUT2B | Full-bridge motor outputs | Four terminals driving two-phase bipolar stepper windings; rated for 7 A peak pulsed current. |
| REFIN | Current reference input | Analog voltage setting full-scale winding current; enables precise, temperature-stable current control. |
| CLK | External oscillator input | Accepts 1–32 MHz crystal or clock source; determines PWM frequency and motion timing resolution. |
| SPI_CS, SPI_SCK, SPI_MOSI, SPI_MISO | SPI interface signals | Standard 4-wire SPI (slave mode); supports daisy-chaining multiple L6470 devices on shared bus. |
| STCK | Step-clock input | Enables legacy step/direction interface mode; overrides motion engine for simple open-loop stepping. |
| BUSY/SYNC | Status output / sync clock | Open-drain BUSY flag indicates motion execution; configurable as SYNC output for multi-axis synchronization. |
| FLAG | Interrupt output | Asserts on alarm conditions (overcurrent, thermal warning, stall, UVLO) - triggers MCU interrupt without polling. |
| SW | External switch input | Hardware limit switch interface; supports GoUntil/ReleaseSW commands for homing and end-stop detection. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded motion engine | Executes acceleration, deceleration, positioning, and speed profiles autonomously - reduces host MCU firmware complexity by >70% in multi-axis systems. |
| Programmable DMOS slew rate | Selectable via CONFIG register to minimize EMI and voltage overshoot during switching transitions - critical for EMC-compliant medical devices. |
| Non-dissipative overcurrent protection | Uses internal current-sense MOSFETs instead of shunt resistors - eliminates power loss and board space for external sensing components. |
| Low quiescent current (10 µA standby) | Enables battery-operated portable instruments to maintain months-long sleep-mode runtime without compromising wake-up responsiveness. |
| Integrated BEMF compensation | Automatically adjusts winding voltage based on motor speed and supply rail - maintains torque linearity across 0–1000 RPM range. |
Applications
| 3D Printer Extruder Control | Lab Automation Pipetting System |
|---|---|
Use Scenario: Precise filament feed control with variable speed and bidirectional movement during layer deposition and retraction. IC Role / Device Role / Timing Role: Motor driver with motion engine executing trapezoidal speed profiles and microstep-positioned extrusion stops. Use Value: Eliminates stepper resonance artifacts at 1/128 microstepping, reducing print surface ripple below 5 µm RMS. |
Use Scenario: High-repeatability liquid handling with multi-tip pipette head requiring synchronized Z-axis lift/drop and tip ejection. IC Role / Device Role / Timing Role: Dual-axis coordinated driver (with companion L6470) managing vertical actuation and tip-release sequencing via SPI-triggered GoUntil. Use Value: Sensorless stall detection confirms tip ejection completion without optical sensors - cutting BOM cost by $1.20/unit. |
| Medical Infusion Pump | Industrial CNC Rotary Indexer |
Use Scenario: Low-noise, vibration-free syringe advancement at flow rates from 0.1 mL/h to 100 mL/h with dose accuracy ±0.5%. IC Role / Device Role / Timing Role: Closed-loop stepper controller using MIN_SPEED/ACC/DEC registers to enforce smooth ramping and prevent missed steps under load variation. Use Value: 3.0 A rms current capability sustains torque at low speeds without thermal derating - enabling 24/7 operation in Class II medical enclosures. |
Use Scenario: Index table positioning with repeatable 0.001° angular resolution and <10 ms settling time between 12 positions per cycle. IC Role / Device Role / Timing Role: Motion engine executing GoTo commands with ABS_POS tracking and automatic microstep interpolation. Use Value: Integrated absolute position counter eliminates homing routine at power-up - reducing machine cycle time by 1.8 seconds per part. |
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 | Lower peak current (2.8 A), integrated UART interface, stealthChop2 noise suppression - no embedded motion engine; requires external MCU for profile generation. | Best suited for consumer-grade 3D printers where acoustic noise matters more than autonomous motion control. | Select when silent operation is prioritized over motion autonomy and higher torque delivery. |
| DRV8825 | Fixed 1/32 microstepping, no stall detection, no motion engine, analog current control only - lacks SPI register set and programmable protections. | Applicable in cost-sensitive, low-complexity open-loop systems without safety-critical fault response requirements. | Select only for basic stepper control where firmware overhead and protection features are not required. |
Compared with TMC2209-LA and DRV8825, the L6470PDTR uniquely combines autonomous motion execution, sensorless stall detection, and 7 A peak drive in a single chip - making it the only choice for safety-aware, space-constrained industrial motion where host MCU resources are limited.
Availability
L6470PDTR is available at Aetrix Electronics and suitable for industrial CNC indexers, medical infusion pumps, automated lab pipetting systems, and precision 3D printer extruders requiring stable component supply and long-term production continuity.
Supply support for L6470PDTR 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, specializing in power management, motion control, and embedded processing solutions for industrial and automotive markets.
The L6470PDTR belongs to ST's dedicated motion control IC portfolio, engineered to replace discrete H-bridge + MCU + current sense designs with a single-chip, SPI-programmable solution for compact, intelligent stepper actuation.
FAQ
What is the maximum achievable microstepping resolution of the L6470PDTR?
The L6470PDTR supports true 1/128 microstepping resolution via its internal PWM sinewave generator and phase current interpolation logic. This is confirmed in Section 6.4 and Figure 6 of the official datasheet (DocID16737 Rev 7), and is enabled by writing STEP_MODE register value 0x07. No external components or firmware interpolation are required to achieve this resolution.
Does the L6470PDTR require an external current sense resistor?
No. The L6470PDTR uses integrated on-die current sensing in its DMOS power stages, eliminating the need for external shunt resistors. Current regulation and non-dissipative overcurrent protection are implemented using internal MOSFET-based sensing, as detailed in Sections 7.1 and 9.1.10 (KVAL_HOLD/RUN/ACC/DEC registers) of the datasheet.
Can the L6470PDTR operate without an external crystal or clock source?
Yes. The L6470PDTR includes an internal 16 MHz RC oscillator that enables full functionality including motion engine operation and SPI communication. An external clock (1–32 MHz) is optional and used only when higher timing precision or synchronization across multiple devices is required, as specified in Section 6.8.1–6.8.2.
How does sensorless stall detection work in the L6470PDTR?
Sensorless stall detection monitors asymmetry in the decay time of phase currents during PWM off-times. When motor load exceeds torque capacity, back-EMF collapse alters current decay slope - detected by the internal ADC and flagged via STATUS register bit STALLA/STALLB. This is implemented without external sensors and validated in Section 7.2 and Table 16 of the datasheet.
L6470PDTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STSPIN L64
- Package/Case:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- 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:
- PowerSO-36 Slug Up
L6470PDTR FAQ
1.How can I place an order for L6470PDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6470PDTR 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 L6470PDTR reliable?
The price and inventory of L6470PDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6470PDTR is usually 5 days.
3.What payment methods are accepted for L6470PDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6470PDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6470PDTR?
L6470PDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6470PDTR 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 L6470PDTR?
For technical support, including L6470PDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6470PDTR requirements.
6.How does Aetrix verify that L6470PDTR is sourced from the original manufacturer or authorized distributors?
All L6470PDTR 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 L6470PDTR meets industry standards.
7.What is the process for return or replacement of L6470PDTR?
All L6470PDTR units undergo pre-shipment inspection (PSI). If there is an issue with L6470PDTR, 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 L6470PDTR part is unused and in its original packaging.
Return procedure for L6470PDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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