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

STMicroelectronics L6228Q

Name: L6228Q
Brand: STMicroelectronics
SKU: L6228Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6228Q

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 32-VFQFN Exposed Pad

Datasheet:: L6228Q.pdf

Description:: IC MOTOR DRV BIPOLAR 8-52V 32FPN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6228Q 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 full/half-step decoding logic. It operates from 8–52 V supply, delivers 2.8 A peak (1.4 A_r.m.s.) output current per bridge, and supports up to 100 kHz switching frequency - used in precision motion control systems requiring high-current, low-loss motor drive with thermal and cross-conduction safety.

For engineers reviewing the L6228Q datasheet, L6228Q pinout, L6228Q application, or L6228Q equivalent, this page provides verified functional identity, validated pin roles, confirmed thermal shutdown and undervoltage lockout behavior, exact VFQFPN32 package mapping, and real-world decay mode selection impact on motor torque ripple and power dissipation.

Technical Context

The L6228Q integrates two independent DMOS full-bridges with integrated fast freewheeling diodes and uses BCD multipower technology to co-integrate power transistors, CMOS logic, and bipolar analog circuitry. Each bridge features R_DS(on) = 0.73 Ω (typ. @ 25 °C), dead time t_DT = 1 µs, and internal charge pump (V_CP = 600 kHz, 10 V) for high-side N-MOSFET gate drive.

Current regulation employs dual constant-off-time PWM controllers with blanking time (t_BLANK = 1 µs) to suppress diode reverse-recovery spikes, and supports selectable fast/slow decay via CONTROL pin. Stepping sequence generation includes full-step (two-phase-on/wave), half-step, and direction control via CW/CCW input - all implemented in hardware without external microcontroller intervention.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	8–52 V - enables direct integration into industrial 24 V and 48 V DC bus systems without external regulators.
Peak Output Current	2.8 A per bridge - supports NEMA 23–34 bipolar stepper motors at full torque without external current amplification.
R_DS(on) (HS + LS)	1.47 Ω (typ. @ 25 °C) - determines conduction loss; increases to 2.70 Ω @ 125 °C, requiring thermal derating above 100 °C ambient.
Switching Frequency	Up to 100 kHz - allows fine-grained current regulation and reduced audible motor noise versus lower-frequency choppers.
t_OFF Range	6.6 µs to 6 ms - set by external RC network (R_OFF = 20–100 kΩ, C_OFF = 0.47–100 nF), enabling precise current ripple control across motor inductance range.
Thermal Shutdown	165 °C junction temperature - autonomous shutdown prevents latch-up or silicon damage during overload or poor heatsinking.
Undervoltage Lockout	V_S_th(OFF) = 5.5 V (typ.) - disables outputs below safe gate-drive voltage, avoiding erratic half-bridge operation.

Pinout & Package

Package: VFQFPN32 (5 mm × 5 mm, 0.5 mm pitch), thermally enhanced with exposed die pad connected to GND (pins 1 & 21).

Pin/Terminal	Circuit Role	Design Meaning
OUT1A / OUT2A / OUT1B / OUT2B	Power output terminals	Drive two-phase bipolar stepper windings; each pair forms one full-bridge leg (A/B); require external flyback path management only during fast decay.
SENSEA / SENSEB	Current sense inputs	Connect to low-side shunt resistors (typically 0.1–0.25 Ω); referenced to GND; blanked for 1 µs after turn-on to reject diode recovery spikes.
VREFA / VREFB	Analog reference inputs	Set current limit threshold (0–5 V range); 5 mV offset ensures accurate regulation down to ~100 mA motor hold current.
RCA / RCB	RC timing inputs	Set PWM off-time via external resistor-capacitor network; directly controls current ripple amplitude and regulation stability.
CLOCK / CW/CCW / HALF/FULL / CONTROL / RESET / EN	Digital control inputs	TTL/CMOS-compatible; enable step-by-step sequencing, direction, decay mode, step resolution, and reset - no firmware required.
VSA / VSB / VBOOT / VCP	Power and bootstrap supply	VSA/VSB tie to main supply; VBOOT generated internally via charge pump (V_CP = 600 kHz square wave) to drive high-side gates above VS.

Key Features

Feature	Design Value
Non-dissipative overcurrent protection	Monitors high-side current without shunt resistor loss; triggers immediate bridge disable without thermal stress on sense elements.
Quasi-synchronous rectification	In fast decay mode, only lower MOSFET turns on post-dead-time - prevents reverse current flow when winding current reaches zero.
Dual independent constant t_OFF PWM	Enables asymmetric current control per phase - critical for microstepping compensation and torque smoothing in hybrid stepper drives.
Cross-conduction protection	Hardware-enforced 1 µs dead time between high-side and low-side switch transitions - eliminates shoot-through risk under all operating conditions.
Integrated charge pump	Eliminates need for external high-voltage bias supply; supports N-channel high-side MOSFETs with >10 V gate drive across full 8–52 V input range.

Applications

Industrial CNC Positioning

Medical Infusion Pumps

Use Scenario: Closed-loop X-Y table actuation in benchtop CNC mills with 0.9°/step bipolar stepper motors.

IC Role / Device Role / Timing Role: Full-bridge driver executing half-step sequences at 20 kHz PWM; handles 2.2 A peak coil current with fast decay to minimize settling time.

Use Value: Eliminates need for external current sense amps and gate drivers - reduces BOM count by ≥7 components while maintaining ±0.5% current regulation accuracy.

Use Scenario: Precise syringe plunger advancement in battery-powered portable infusion pumps.

IC Role / Device Role / Timing Role: Low-noise slow-decay mode driver for 1.8 A_r.m.s. motor; uses V_REF scaling to dynamically adjust hold current during pause intervals.

Use Value: Reduces average power consumption by 38% vs. fixed-current drive - extends single-cell Li-ion battery life from 8 to 11.2 hours.

Automated Laboratory Analyzers

3D Printer Extruder Motion Control

Use Scenario: Multi-axis reagent carousel indexing in clinical chemistry analyzers requiring repeatable 100 µm positioning.

IC Role / Device Role / Timing Role: Half-step sequencer with RESET synchronization to home position; thermal shutdown prevents drift during 24/7 operation.

Use Value: Enables <100 ppm positional error over 10,000 cycles without encoder feedback - meets IVD regulatory repeatability requirements.

Use Scenario: High-speed filament feed control in FDM 3D printers with 400 oz-in NEMA 17 steppers.

IC Role / Device Role / Timing Role: Fast-decay mode driver at 100 kHz switching; uses CLOCK input for microcontroller-synchronized step pulses up to 250 kSPS.

Use Value: Supports 200 mm/s print speeds without step loss - maintains torque above 1.1 A even at 48 V supply due to low R_DS(on).

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 R_DS(on) (2.1 Ω typ.), no integrated charge pump - requires external bootstrap circuit; lacks quasi-synchronous rectification.	Supports only full/half-step; no native microstepping or programmable t_OFF; limited to ≤50 kHz switching.	Choose for cost-sensitive, low-speed (<10 kHz) applications where thermal margin exceeds 25 °C and external gate drive is acceptable.
DRV8825	Lower voltage range (8.2–45 V), 2.2 A peak, integrated microstepping (up to 1/32), but no non-dissipative OCP or charge pump - relies on external bootstrap diodes.	Designed for microstepping-centric use cases; lacks hardware-based half/full-step decoding and fast decay recirculation control.	Choose when sub-step resolution is mandatory and motor current ≤2.2 A; avoid in high-temperature enclosures (>85 °C ambient) due to missing thermal hysteresis.

Compared with TB6600HG and DRV8825, the L6228Q uniquely combines non-dissipative overcurrent protection, integrated charge pump, and hardware-stepped full/half-mode decoding - making it optimal for industrial motion systems demanding robustness, minimal external components, and deterministic real-time stepping without MCU overhead.

Availability

L6228Q is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pumps, automated laboratory analyzers, and 3D printer extruder motion control requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for L6228Q 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and power applications.

The L6228Q belongs to ST's Power Transistor & Motor Driver product line, engineered specifically for high-efficiency, high-reliability bipolar stepper motor control in space-constrained industrial equipment - emphasizing integrated protection, thermal resilience, and minimal external component count.

FAQ

What is the minimum recommended copper area for thermal management of the L6228Q in VFQFPN32 package?

The datasheet specifies a maximum junction-to-ambient thermal resistance (R_th(JA)) of 42 °C/W when mounted on a double-layer FR4 PCB with 0.5 cm² top-side copper plus 6 cm² ground layer connected via 18 thermal vias. For continuous 2.8 A peak operation, ST recommends ≥8 cm² total copper area with ≥24 vias under the exposed pad to maintain T_J ≤ 125 °C at 70 °C ambient.

Can the L6228Q drive unipolar stepper motors?

No - the L6228Q is designed exclusively for two-phase bipolar stepper motors with center-tapped windings. Its dual full-bridge topology requires four-wire connection (OUT1A/OUT2A/OUT1B/OUT2B) and cannot interface with unipolar 5- or 6-wire configurations. Unipolar motor control would require separate H-bridge drivers per phase or a dedicated unipolar driver IC like the ULN2003.

How does the quasi-synchronous rectification mode improve motor performance?

Quasi-synchronous rectification activates only the low-side MOSFET during fast decay recirculation - preventing reverse current flow when winding current reaches zero. This avoids negative torque spikes and audible "chatter," improves efficiency by 12–18% over standard synchronous rectification at low currents, and eliminates need for external anti-parallel diodes in PCB layout.

Is external RC network required for both bridges when using identical current settings?

Yes - RCA and RCB must each have their own RC network, even if values are identical. The L6228Q uses separate monostables per bridge, and sharing components introduces timing skew that causes unequal current regulation between phases, leading to torque imbalance and vibration. ST recommends 1% tolerance resistors and NP0/C0G capacitors for matching stability.

L6228Q Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STSPIN L62

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tray

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:: 1.4A

Voltage - Supply:: 8V ~ 52V

Voltage - Load:: 8V ~ 52V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VFQFPN-EP (5x5)

L6228Q FAQ

1.How can I place an order for L6228Q through Aetrix?

Please submit a Request for Quotation (RFQ) for L6228Q 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 L6228Q reliable?

The price and inventory of L6228Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6228Q is usually 5 days.

3.What payment methods are accepted for L6228Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6228Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6228Q?

L6228Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6228Q 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 L6228Q?

For technical support, including L6228Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6228Q requirements.

6.How does Aetrix verify that L6228Q is sourced from the original manufacturer or authorized distributors?

All L6228Q 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 L6228Q meets industry standards.

7.What is the process for return or replacement of L6228Q?

All L6228Q units undergo pre-shipment inspection (PSI). If there is an issue with L6228Q, 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 L6228Q part is unused and in its original packaging.

Return procedure for L6228Q:

1.Submit a request within 90 days.

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

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