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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

STMicroelectronics L6208QTR

Name: L6208QTR
Brand: STMicroelectronics
SKU: L6208QTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6208QTR

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 48-VFQFN Exposed Pad

Datasheet:: L6208QTR.pdf

Description:: IC MTR DRVR BIPOLAR 8-52V 48QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6208QTR from STMicroelectronics is a DMOS dual full-bridge stepper motor driver IC for bipolar stepper motors, featuring non-dissipative overcurrent protection, dual independent constant t_OFF PWM current controllers, and integrated fast freewheeling diodes. It operates from 8–52 V supply, delivers 5.6 A peak output current per bridge, supports up to 100 kHz switching frequency, and implements fast/slow decay synchronous rectification with cross-conduction protection.

For engineers reviewing the L6208QTR datasheet, L6208QTR pinout, L6208QTR application, or L6208QTR equivalent, this page provides verified technical context on its two-phase stepping sequence generation, R_DS(on) = 0.34 Ω (typ) at 25 °C, thermal shutdown at 165 °C, VFQFPN48 package layout, and real-time current regulation via external RC networks on RCA/RCB pins.

Technical Context

The L6208QTR integrates two independent DMOS full bridges with BCDmultipower technology, each featuring high-side and low-side N-channel MOSFETs with intrinsic fast freewheeling diodes and R_DS(on) of 0.34 Ω (typ) at 25 °C. Its phase sequence generator supports full-step (two-phase-on and one-phase-on) and half-step modes, driven by CLOCK, CW/CCW, and HALF/FULL logic inputs.

Current regulation uses dual constant t_OFF PWM controllers with blanking time (1 µs) to suppress diode reverse-recovery spikes, where t_OFF is set externally via RC networks on RCA/RCB pins (20 kΩ ≤ R ≤ 100 kΩ, 0.47 nF ≤ C ≤ 100 nF), yielding t_OFF from 6.6 µs to 6 ms. Deadtime (1 µs typ) prevents shoot-through during bridge transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	8–52 V - Enables direct integration into industrial 24 V and 48 V motor control rails without external DC-DC pre-regulation.
Peak Output Current	5.6 A - Supports high-torque bipolar stepper motors up to NEMA 23 size in open-loop motion systems.
R_DS(on) (High-Side, 25 °C)	0.34 Ω typ - Limits conduction loss to ≤1.0 W per channel at 2.5 A RMS, reducing thermal load on VFQFPN48 package.
Switching Frequency	Up to 100 kHz - Allows fine current ripple control and smooth microstepping-compatible operation when paired with external controllers.
t_OFF Range	6.6 µs to 6 ms - Configurable via external RC on RCA/RCB to match motor inductance and target chopper frequency (e.g., 20–50 kHz typical).
Thermal Shutdown Threshold	165 °C - Provides fail-safe junction protection during overload or poor PCB thermal design, with automatic recovery after cooldown.
Logic Input Compatibility	TTL/CMOS - Accepts 0.8 V / 2.0 V thresholds and ±10 µA bias, enabling direct interface with MCU GPIOs without level-shifting.

Pinout & Package

Available in VFQFPN48 (7 × 7 × 1.0 mm) package with exposed thermal pad (EPAD) requiring GND connection for optimal heat dissipation and EMI control.

Pin/Terminal	Circuit Role	Design Meaning
CLOCK (43)	Logic input	Rising-edge-triggered step clock; determines stepping rate and synchronizes state machine transitions.
CW/CCW (44)	Logic input	Direction control: HIGH = clockwise, LOW = counterclockwise; internally pulled to defined state if unused.
HALF/FULL (18)	Logic input	Selects stepping mode: HIGH = half-step (8 states), LOW = full-step (4 states); sets resolution without external logic.
CONTROL (19)	Logic input	Decay mode selector: HIGH = slow decay (low-side recirculation), LOW = fast decay (diode-based recirculation).
EN (20)	Logic input	Active-low enable; also serves as fault-reporting node for overcurrent/thermal events via open-drain structure.
VREFA/VREFB (42/17)	Analog input	Reference voltage (0–5 V) setting peak current limit per bridge: I_PEAK ≈ V_REF/R_SENSE.
SENSEA/SENSEB (45–46/15–16)	Power supply	Bridge A/B source connections to external current-sense resistors (typically 0.1–0.25 Ω), referenced to power ground.
RCA/RCB (48/13)	RC pin	External RC network sets PWM t_OFF; time constant directly defines chopper frequency and current ripple.
OUT1A/OUT2A (2–3/38–39)	Power output	Bridge A high-side and low-side outputs; drive one motor phase with complementary switching and deadtime control.
OUT1B/OUT2B (10–11/22–23)	Power output	Bridge B high-side and low-side outputs; drive second motor phase independently with identical timing and protection.
VSA/VSB (34–35/26–27)	Power supply	Bridge A/B high-voltage supply inputs; must be tied together to common 8–52 V rail with local bulk capacitance.
VBOOT (21)	Supply voltage	Bootstrap voltage for high-side gate drive; generated internally via charge pump (VCP output at ~600 kHz).

Key Features

Feature	Design Value
Dual independent constant t_OFF PWM controllers	Enables precise, matched current regulation across both motor phases using separate RCA/RCB RC networks-critical for torque balance and vibration reduction.
Non-dissipative overcurrent protection	Detects overcurrent on high-side MOSFETs without sense-resistor power loss; triggers immediate shutdown while preserving thermal margin under stall conditions.
Fast/slow decay synchronous rectification	Reduces power dissipation during current recirculation: slow decay minimizes ripple and audible noise; fast decay improves dynamic response and torque at high speed.
Integrated stepping sequence generator	Eliminates need for external sequencer logic-generates full/half-step waveforms internally from CLOCK, CW/CCW, and HALF/FULL inputs.
Cross-conduction protection with 1 µs deadtime	Prevents shoot-through during bridge switching transitions, ensuring safe operation even with fast gate-drive edges and layout parasitics.

Applications

Industrial CNC Positioning

Medical Infusion Pumps

Use Scenario: Open-loop positioning of X/Y axes in compact desktop CNC mills with NEMA 17–23 stepper motors.

IC Role / Device Role / Timing Role: Dual-bridge driver executing full/half-step sequences with real-time current chopping and decay-mode optimization for smooth acceleration.

Use Value: Eliminates external sequencer and current-sense amplifiers; 5.6 A peak current supports >0.5 N·m holding torque at 24 V, enabling rapid axis moves without microstepping controller overhead.

Use Scenario: Precise fluid delivery in portable infusion pumps requiring silent, low-vibration motor control at sub-mL/hr accuracy.

IC Role / Device Role / Timing Role: Bipolar stepper driver implementing slow-decay mode to minimize current ripple and acoustic noise during continuous low-speed rotation.

Use Value: Integrated fast freewheeling diodes and 1 µs blanking reduce electromagnetic interference (EMI) and current spikes-critical for meeting IEC 60601-1 EMC requirements.

Automated Laboratory Equipment

3D Printer Extruder Control

Use Scenario: Sample carousel indexing and reagent dispensing in benchtop analyzers with strict duty-cycle and thermal constraints.

IC Role / Device Role / Timing Role: Stepper driver with thermal shutdown (165 °C) and undervoltage lockout (6 V) ensuring fail-safe operation during intermittent high-load moves.

Use Value: Non-dissipative overcurrent protection avoids false trips during startup inrush; VFQFPN48 package enables dense PCB layouts with minimal heatsinking.

Use Scenario: High-speed filament feeding in FDM 3D printers where extruder motor must respond instantly to layer-change commands.

IC Role / Device Role / Timing Role: Fast-decay mode enabled via CONTROL pin to maximize torque at high step rates (>10 kHz), minimizing missed steps during acceleration.

Use Value: 100 kHz max switching frequency allows tight current-loop bandwidth; dual independent PWM controllers maintain phase current balance across temperature drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TB6600HG	Higher voltage range (12–45 V), 4.5 A peak, no integrated charge pump-requires external bootstrap circuitry.	Lacks internal phase sequencer; needs external step/direction logic and current reference generation.	Preferred for cost-sensitive designs where external control logic already exists and thermal budget permits discrete bootstrap components.
DRV8825	Lower voltage (8.2–45 V), 2.2 A RMS, microstepping support, integrated current DAC-no external RC timing required.	Designed for microstepping; lacks non-dissipative overcurrent protection and fast/slow decay selection via single pin.	Better suited for quiet, high-resolution positioning; not recommended for high-current (>3 A) or high-speed (>50 kHz) bipolar motor applications.

Compared with TB6600HG and DRV8825, the L6208QTR uniquely combines non-dissipative overcurrent protection, dual independent t_OFF PWM control, and embedded stepping logic in a thermally efficient VFQFPN48 package-making it optimal for robust, self-contained 5 A-class bipolar stepper systems where reliability and board space are critical.

Availability

L6208QTR is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pumps, automated laboratory equipment, and 3D printer extruder control requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for L6208QTR 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 automotive-grade analog/mixed-signal ICs.

The L6208QTR belongs to ST's dedicated motor driver portfolio designed for high-efficiency, high-reliability bipolar stepper control in industrial automation and precision medical devices-emphasizing integrated protection, thermal resilience, and simplified system-level design.

FAQ

What is the minimum external component count needed to operate the L6208QTR?

The L6208QTR requires only six external components for basic operation: two current-sense resistors (SENSEA/SENSEB), two RC networks (RCA/RCB), one bootstrap capacitor (C_BOOT), and one charge-pump capacitor (C_P). No external gate drivers, current amplifiers, or sequencing logic are needed-the internal phase generator, PWM controllers, and charge pump eliminate those subsystems.

How does the non-dissipative overcurrent protection differ from conventional sense-resistor methods?

Unlike resistor-based overcurrent detection that dissipates power proportional to I²R during fault events, the L6208QTR monitors high-side MOSFET conduction voltage directly. When V_DS exceeds threshold, it triggers immediate shutdown without adding sense-resistor losses-preserving efficiency and thermal headroom during stall or short-circuit conditions.

Can the L6208QTR drive unipolar stepper motors?

No-the L6208QTR is specifically designed for two-phase bipolar stepper motors with center-tapped windings. Its dual full-bridge topology requires four-wire (A+, A−, B+, B−) connection and cannot configure for unipolar (five- or six-wire) winding topologies or single-polarity drive schemes.

What is the role of the VCP pin and how should it be used?

VCP is the internal charge-pump oscillator output (600 kHz typical, 10 V amplitude) used to generate V_BOOT. It must connect to an external 10 nF capacitor (C_P) and 100 Ω resistor (R_P) per ST's recommended circuit. This signal drives the external bootstrap network-no external clock or driver is needed, and VCP must not be loaded or buffered.

L6208QTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STSPIN L62

Package/Case:: 48-VFQFN 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:: Parallel

Technology:: DMOS

Step Resolution:: 1, 1/2

Applications:: General Purpose

Current - Output:: 2.5A

Voltage - Supply:: 8V ~ 52V

Voltage - Load:: 8V ~ 52V

Operating Temperature:: -25°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-QFN (7x7)

L6208QTR FAQ

1.How can I place an order for L6208QTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6208QTR 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 L6208QTR reliable?

The price and inventory of L6208QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6208QTR is usually 5 days.

3.What payment methods are accepted for L6208QTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6208QTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6208QTR?

L6208QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6208QTR 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 L6208QTR?

For technical support, including L6208QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6208QTR requirements.

6.How does Aetrix verify that L6208QTR is sourced from the original manufacturer or authorized distributors?

All L6208QTR 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 L6208QTR meets industry standards.

7.What is the process for return or replacement of L6208QTR?

All L6208QTR units undergo pre-shipment inspection (PSI). If there is an issue with L6208QTR, 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 L6208QTR part is unused and in its original packaging.

Return procedure for L6208QTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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