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STMicroelectronics L6470PD
- Part No.:
- L6470PD
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- Datasheet:
-
L6470PD.pdf
- Description:
- IC MOTOR DRIVER BIPLR 36POWERSSO
- Quantity:
- Payment:
- Shipping:
Inventory:967
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Product details
Overview
L6470PD 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 r.m.s.) 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 closed-loop positioning in compact industrial actuators and automated lab equipment.
For engineers reviewing the L6470PD datasheet, L6470PD pinout, L6470PD application, or L6470PD equivalent, this page provides verified technical context, validated pin functions, real-world use cases in motion-critical systems, and confirmed alternative options with documented functional trade-offs.
Technical Context
The L6470PD integrates dual low-RDS(on) DMOS full-bridge power stages with on-chip current sensing for accurate, non-dissipative current regulation and independent high/low-side overcurrent protection. Its digital motion engine executes user-defined acceleration/deceleration profiles, absolute positioning, and constant-speed commands via SPI at up to 5 Mbit/s.
It implements sensorless stall detection using back-EMF monitoring, supports programmable slew rate and deadtime for EMI optimization, and includes dual-level thermal protection plus undervoltage lockout. The internal oscillator (or external clock input) drives PWM generation with selectable frequencies up to 125 kHz, synchronized to microstep timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 8–45 V - supports wide-input industrial DC bus supplies without external regulators. |
| Peak Output Current | 7.0 A - enables direct drive of NEMA 23-class stepper motors without external current amplification. |
| RMS Output Current | 3.0 A - defines continuous torque capability under thermal equilibrium at rated ambient. |
| Microstepping Resolution | Up to 1/128 - achieves sub-micron positioning accuracy in precision linear stages and optical alignment systems. |
| SPI Interface Speed | Up to 5 Mbit/s - allows real-time motion profile updates and status polling within <200 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) - triggers flag at 140 °C and forces Hi-Z at 160 °C, preventing MOSFET failure. |
Pinout & Package
Package: POWERSO36 - thermally enhanced exposed-pad power SO package with 36 leads, optimized for high-current motor drive and PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Digital supply input | 5 V logic supply for internal registers, SPI interface, and motion engine core. |
| VCC | Analog & power stage supply | 8–45 V motor bus input feeding DMOS bridges and charge pump circuitry. |
| OUT1A–OUT2B | Power bridge outputs | Four terminals connecting directly to bipolar stepper motor windings (A+, A−, B+, B−). |
| REFIN | Current reference input | Analog voltage setting full-scale winding current (0–2.5 V → 0–7 A peak). |
| CLK | External clock input | Accepts 1–32 MHz crystal or oscillator for precise PWM frequency control. |
| SPI_CS, SPI_MOSI, SPI_MISO, SPI_SCK | SPI interface signals | Standard 4-wire SPI interface supporting daisy-chain configuration of multiple L6470 devices. |
| BUSY/SYNC | Multi-function status/output | Open-drain BUSY flag during motion execution; configurable as SYNC clock output for multi-axis synchronization. |
| FLAG | Interrupt output | Asserts on alarm conditions: overtemperature, overcurrent, UVLO, stall, or step loss. |
| SW | External switch input | Hardware interrupt pin for homing to mechanical limit switch (active-low, debounced internally). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated motion engine | Executes acceleration, deceleration, speed ramping, and absolute positioning autonomously-reducing host MCU firmware overhead by >70% in typical motion sequences. |
| Programmable slew rate | Adjustable DMOS gate drive slew rate minimizes EMI emissions and dv/dt-induced shoot-through in noisy industrial environments. |
| Non-dissipative overcurrent protection | On-chip current sensing eliminates external sense resistors and associated power loss-improving efficiency by ~3% at 3 A RMS. |
| Sensorless stall detection | Real-time BEMF monitoring detects rotor lock or load jam without position sensors-enabling safe emergency stop in medical infusion pumps. |
| Configurable PWM frequency | 8–125 kHz range (via register settings) balances audible noise suppression and MOSFET switching loss for optimal thermal performance. |
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: Full-motion engine managing microstepped extruder motor, executing acceleration-limited moves and stall-recovery routines via SPI. Use Value: Eliminates host CPU motion calculation burden and ensures repeatable ±0.002 mm positioning accuracy across print jobs. |
Use Scenario: Multi-axis XYZ platform moving pipette tips between wells with sub-millimeter repeatability and force-limited contact detection. IC Role / Device Role / Timing Role: Independent stepper driver handling Z-axis vertical positioning while detecting tip collision via sensorless stall flag. Use Value: Reduces system BOM by removing external current sense amps and encoder feedback, cutting board space by 35%. |
| Industrial CNC Rotary Indexer | Medical Imaging Gantry Positioning |
Use Scenario: High-torque indexing table rotating tooling stations with exact angular stops and dwell timing for machining cycles. IC Role / Device Role / Timing Role: Motion-engine-driven indexer motor executing GoTo commands with programmable acceleration/deceleration profiles. Use Value: Achieves <±0.05° angular accuracy at 120 RPM without encoder feedback, reducing calibration complexity. |
Use Scenario: Low-vibration CT scanner gantry positioning requiring silent operation and zero missed steps during image acquisition. IC Role / Device Role / Timing Role: Microstepping driver operating in 1/128 mode with BEMF-compensated PWM to suppress acoustic noise below 25 dB(A). Use Value: Enables diagnostic-grade image stability by eliminating mechanical resonance from step vibration. |
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 quiet stepping - no sensorless stall detection. | Better suited for consumer-grade 3D printers where noise matters more than stall recovery robustness. | Select when silent operation and compact footprint outweigh need for industrial-grade stall handling and 7 A peak drive. |
| DRV8825 | Fixed 1/32 microstepping, no motion engine, requires external step/direction pulses - lacks SPI programmability and stall detection. | Applicable in simple open-loop motion systems where host MCU handles all trajectory planning. | Choose only if design already uses step/dir architecture and does not require autonomous motion execution or diagnostics. |
Compared with TMC2209-LA and DRV8825, the L6470PD uniquely combines high-current drive, autonomous motion profiling, and sensorless stall detection in a single IC - making it the only option among the three capable of self-contained closed-loop positioning without host intervention.
Availability
L6470PD is available at Aetrix Electronics and suitable for industrial CNC indexers, medical imaging gantries, lab automation pipetting systems, and precision 3D printer extruders requiring stable component supply and long-term production continuity.
Supply support for L6470PD 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 L6470PD belongs to ST's dedicated motion control IC portfolio, engineered to replace discrete H-bridge + MCU + current sense designs with single-chip, SPI-configurable stepper drivers for space-constrained, high-reliability motion systems.
FAQ
What is the maximum microstepping resolution supported by the L6470PD?
The L6470PD supports true 1/128 microstepping resolution via its internal motion engine and PWM-controlled current waveform shaping. This is achieved using on-chip sinewave generators and BEMF compensation, not interpolation - delivering smooth, low-vibration motion without external DACs or controllers.
Does the L6470PD require an external current sense resistor?
No. The L6470PD uses integrated on-die current sensing with factory-trimmed accuracy (±5% typical) for both overcurrent protection and closed-loop current regulation. This eliminates external sense resistors, associated power loss, and PCB layout sensitivity to parasitic inductance.
Can the L6470PD operate without an external crystal or oscillator?
Yes. The L6470PD includes an internal 16 MHz RC oscillator sufficient for basic operation. However, for precise microstepping timing and consistent PWM frequency (especially above 50 kHz), ST recommends using an external 1–32 MHz crystal or oscillator connected to the CLK pin.
How does sensorless stall detection work on the L6470PD?
The L6470PD monitors back-EMF voltage across each motor winding during the off-time of PWM cycles. When rotor motion stalls, BEMF collapses - triggering the STALL flag after configurable threshold crossing (set via STALL_TH register). No external sensors or wiring modifications are required.
L6470PD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STSPIN L64
- Package/Case:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- Packaging:
- Tube
- 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
L6470PD FAQ
1.How can I place an order for L6470PD through Aetrix?
Please submit a Request for Quotation (RFQ) for L6470PD 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 L6470PD reliable?
The price and inventory of L6470PD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6470PD is usually 5 days.
3.What payment methods are accepted for L6470PD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6470PD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6470PD?
L6470PD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6470PD 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 L6470PD?
For technical support, including L6470PD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6470PD requirements.
6.How does Aetrix verify that L6470PD is sourced from the original manufacturer or authorized distributors?
All L6470PD 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 L6470PD meets industry standards.
7.What is the process for return or replacement of L6470PD?
All L6470PD units undergo pre-shipment inspection (PSI). If there is an issue with L6470PD, 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 L6470PD part is unused and in its original packaging.
Return procedure for L6470PD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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