L6470HTR

Overview

The L6470HTR is a fully integrated microstepping stepper motor driver with an embedded motion engine, manufactured by STMicroelectronics. It features a dual low RDS(on) DMOS full bridge capable of delivering up to 3 A RMS phase current and 7 A peak current. The device supports an operating voltage range of 8 V to 45 V and achieves true 1/128 step resolution via voltage-mode driving. Control is managed through a standard SPI interface with daisy-chain capability. It includes comprehensive protection mechanisms such as thermal shutdown, overcurrent protection, and sensorless stall detection.

Feature Summary

• Integrates a digital control core for generating user-defined motion profiles including acceleration, deceleration, speed, and target position without external MCU calculation.
• Features voltage-mode driving technology that ensures extreme smoothness and high position resolution up to 1/128 microsteps.
• Includes a rich set of hardware protections covering thermal limits, low bus voltage, overcurrent conditions, and motor stall events.

Applications

• Industrial automation systems requiring precise multi-axis positioning
• Medical equipment needing smooth and quiet stepper motor operation
• Security systems utilizing automated locking or scanning mechanisms

Procurement Notes

Verify the specific suffix HTR corresponds to the Tape & Reel packaging format required for your assembly line. Confirm the 28-HTSSOP package dimensions match your PCB footprint design. Ensure the host system provides a compatible SPI interface supporting the necessary clock speeds for register configuration and status monitoring.

Selection Notes

Select this component when a single-chip solution is needed for bipolar stepper motors requiring integrated power stages and motion control logic. It is suitable for applications where reducing bill-of-materials complexity and minimizing external component count are priorities. Consider the 3 A RMS current rating against the specific torque requirements of the target stepper motor.

Part Context

The L6470HTR belongs to the STSPIN L64 series of motor drivers from STMicroelectronics. This family focuses on fully integrated solutions that combine analog mixed-signal technology with digital control cores. The part is designed to simplify the design of robust motor control applications by integrating power switches and sensing circuitry into a single package.

Replacement Considerations

Check for other members of the L647x family, such as L6470 or L6472, which may offer identical electrical characteristics but differ in pinout or package options. Verify compatibility with existing evaluation boards like EVAL6470H if migrating designs.

FAQ

Does the L6470 require an external microcontroller for basic motion profile generation?

No, the device integrates a digital control core that can generate motion profiles for acceleration, deceleration, speed, and target position independently.

What type of drive mode does the L6470 utilize for smooth operation?

It utilizes voltage-mode driving, which provides extreme smoothness and allows for high position resolution up to 1/128 microsteps.