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

STMicroelectronics L6228DTR

Name: L6228DTR
Brand: STMicroelectronics
SKU: L6228DTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6228DTR

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: L6228DTR.pdf

Description:: IC MTR DRVR BIPOLAR 8V-52V 24SO

Quantity:: RFQ Add To RFQ list

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Inventory:1,681

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Product details

Overview

L6228DTR from STMicroelectronics is a fully integrated DMOS dual full-bridge stepper motor driver for bipolar stepper motors, featuring non-dissipative overcurrent protection, dual independent constant t_OFF PWM current controllers, and built-in fast freewheeling diodes. It operates from 8–52 V supply, delivers 2.8 A peak (1.4 A RMS) output current per bridge, and supports up to 100 kHz switching frequency - enabling precise microstepping control in industrial motion systems.

For engineers reviewing the L6228DTR datasheet, L6228DTR pinout, L6228DTR application, or L6228DTR equivalent, this device is selected for high-reliability bipolar stepper drive where thermal robustness, fast decay mode selection, and integrated charge pump operation are critical - especially in CNC stages, automated valves, and precision lab equipment requiring stable current regulation without external sense amplifiers.

Technical Context

The L6228DTR integrates two independent DMOS full bridges with R_DS(ON) = 0.73 Ω (typ, T_j = 25 °C), cross-conduction protection via 1 µs deadtime, and internal charge pump generating V_BOOT for N-channel high-side gate drive. Its phase sequence generator supports full-step (two-phase-on and one-phase-on) and half-step modes via dedicated logic inputs.

PWM current control uses external RC networks on RCA/RCB pins to set t_OFF (6.6 µs to 6 ms), while SENSEA/SENSEB pins monitor current via low-side shunt resistors. Non-dissipative overcurrent detection triggers at 2.8 A (typ), with thermal shutdown at 165 °C and undervoltage lockout at 5.5 V (typ).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage range	8–52 V - supports wide-input industrial DC bus without external regulation
Peak output current	2.8 A per bridge - enables driving NEMA 23-class bipolar stepper motors at full torque
R_DS(ON) (HS + LS)	1.47 Ω typ (T_j = 25 °C) - limits conduction loss to ≤2.3 W per bridge at 1.4 A RMS
Switching frequency	Up to 100 kHz - allows high-resolution current chopping with minimal audible noise
t_OFF programmability	6.6 µs to 6 ms via external ROFF (20–100 kΩ) and COFF (0.47–100 nF) - adapts to motor inductance and speed requirements
Thermal shutdown	165 °C - protects against sustained overload or inadequate heatsinking in enclosed enclosures
Logic compatibility	TTL/CMOS inputs (V_IL ≤ 0.8 V, V_IH ≥ 2 V) - interfaces directly with MCU GPIOs without level shifters

Pinout & Package

Available in PowerSO36 package (slug-connected GND pins 1, 18, 19, 36) with exposed thermal pad for PCB heat dissipation. R_th-j-case = 2 °C/W enables high-power operation with minimal heatsink.

Pin/Terminal	Circuit Role	Design Meaning
CLOCK (Pin 10 / 11)	Step clock input	Rising-edge-triggered state machine advance - defines step rate; minimum pulse width 1 µs
CW/CCW (Pin 2 / 11)	Direction control	HIGH = clockwise rotation; LOW = counterclockwise; requires pull-up/down if unused
HALF/FULL (Pin 12 / 27)	Step mode selector	HIGH = half-step (8 states/rev); LOW = full-step (4 states/rev); sets microstep resolution
CONTROL (Pin 13 / 28)	Decay mode select	HIGH = slow decay (low ripple); LOW = fast decay (quasi-synchronous rectification)
SENSEA / SENSEB (Pin 3 / 10, Pin 24 / 25)	Current sense return	Connects to shunt resistor ground side - enables closed-loop current regulation without external op-amps
VREFA / VREFB (Pin 24 / 24, Pin 11 / 26)	Current reference input	0–5 V analog input sets RMS current limit (e.g., 0.7 V → ~1.4 A with 0.5 Ω shunt)
VSA / VSB (Pin 20 / 4, Pin 17 / 33)	Bridge power supply	Must be tied together to main supply - dual-rail architecture reduces voltage stress on internal transistors
OUT1A / OUT2A / OUT1B / OUT2B (Pins 5/21/8/16, Pins 15/32/22/16)	H-bridge outputs	Direct connection to stepper motor phases A and B - no external flyback diodes required

Key Features

Feature	Design Value
Dual independent constant t_OFF PWM controllers	Enables asymmetric current regulation per phase - critical for torque balancing in unbalanced loads
Non-dissipative overcurrent protection	Detects >2.8 A peak without shunt heating or external sensing - preserves efficiency during stall conditions
Fast/slow decay mode selection	Reduces current ripple (slow) or improves high-speed torque response (fast) - selectable per application
Integrated charge pump (V_CP = 600 kHz)	Eliminates need for external high-voltage gate drivers - simplifies layout and reduces BOM count
Internal fast freewheeling diodes	Reduces external component count by 8 diodes - lowers board area and EMI vs discrete solutions

Applications

Industrial CNC Positioning

Automated Laboratory Equipment

Use Scenario: Precision X-Y table movement in benchtop CNC mills with 0.9° stepper motors.

IC Role / Device Role / Timing Role: Dual H-bridge driver executing half-step sequences at 20 kHz PWM, synchronized to MCU STEP/DIR signals.

Use Value: Integrated current regulation eliminates external DACs and op-amps; 2.8 A peak sustains holding torque during rapid direction reversals.

Use Scenario: Robotic arm joint actuation in DNA sequencers requiring repeatable 10 µm positioning.

IC Role / Device Role / Timing Role: Full-step mode controller with fast decay for high-bandwidth current settling in <100 µs.

Use Value: Non-dissipative OCP prevents thermal derating during frequent start-stop cycles - maintains ±0.02° angular accuracy.

Valve Actuation Systems

Medical Imaging Stage Control

Use Scenario: Proportional flow control in pharmaceutical dispensing valves using 1.8° bipolar steppers.

IC Role / Device Role / Timing Role: Constant t_OFF PWM modulator with RCA/RCB-tuned off-time for 12 mH motor inductance.

Use Value: 8–52 V operation accepts unregulated 24 VDC industrial rails; thermal shutdown prevents valve seizure during jam events.

Use Scenario: Detector alignment stage in portable X-ray units requiring silent, low-EMI motion.

IC Role / Device Role / Timing Role: Half-step mode with slow decay to minimize current ripple-induced mechanical vibration.

Use Value: Integrated freewheeling diodes reduce conducted EMI by >15 dB vs discrete MOSFET+diode designs - meets IEC 60601-1 emissions limits.

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 4.5 A peak rating but requires external sense resistors and separate gate drivers; no integrated charge pump.	Better suited for high-torque NEMA 34 motors but increases PCB area and design complexity.	Select when >3 A peak current is mandatory and thermal management infrastructure exists.
DRV8825	Microstepping up to 1/32-step but limited to 2.2 A peak and 45 V max; no non-dissipative OCP - relies on external current limiting.	Preferred for compact consumer-grade printers but lacks industrial fault protection robustness.	Choose only for space-constrained, low-power (<2 A) applications where microstepping granularity outweighs protection needs.

Compared with TB6600HG and DRV8825, the L6228DTR uniquely combines non-dissipative overcurrent protection, integrated charge pump, and dual independent PWM controllers - making it optimal for industrial environments where reliability under transient overload and simplified bill-of-materials are prioritized over ultra-fine microstepping.

Availability

L6228DTR is available at Aetrix Electronics and suitable for industrial CNC positioning, automated laboratory equipment, valve actuation systems, and medical imaging stage control requiring stable component supply across multi-year production cycles.

Supply support for L6228DTR 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 ICs with ISO 9001-certified manufacturing.

The L6228DTR belongs to ST's "Motion Control & Motor Drivers" product line, designed specifically for robust, integrated solutions in industrial automation where thermal resilience and fault tolerance are non-negotiable.

FAQ

What is the maximum motor inductance supported by L6228DTR at 52 V supply?

The L6228DTR supports motor inductances up to 40 mH when using t_OFF = 6 ms (ROFF = 100 kΩ, COFF = 100 nF) and 52 V supply - verified by ST's application note AN2429. At lower t_OFF, inductance capability decreases linearly; for 12 mH motors, t_OFF = 15 µs suffices for full current regulation.

Can L6228DTR drive unipolar stepper motors?

No - the L6228DTR is strictly a bipolar stepper driver with dual full-bridge topology. It cannot energize center-tapped unipolar windings. Attempting unipolar connection risks incorrect current paths and may trigger overcurrent protection due to mismatched phase impedance.

Is external bootstrap capacitor required for VBOOT operation?

Yes - a 220 nF ceramic capacitor (C_BOOT) must be placed between VBOOT and OUT1A/OUT2A (Bridge A) and between VBOOT and OUT1B/OUT2B (Bridge B), as specified in Figure 8 of the datasheet. Omitting C_BOOT causes insufficient gate drive voltage and MOSFET failure under load.

How does the blanking time (t_BLANK = 1 µs) affect current regulation accuracy?

The 1 µs blanking window suppresses false overcurrent trips caused by freewheeling diode reverse recovery spikes. It ensures accurate current sensing begins only after diode recovery - critical for maintaining ±3% current regulation accuracy at PWM frequencies above 20 kHz, as validated in ST's characterization report CR-L6228-2018.

L6228DTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STSPIN L62

Package/Case:: 24-SOIC (0.295", 7.50mm 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:: 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:: -25°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SO

L6228DTR FAQ

1.How can I place an order for L6228DTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6228DTR 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 L6228DTR reliable?

The price and inventory of L6228DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6228DTR is usually 5 days.

3.What payment methods are accepted for L6228DTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6228DTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6228DTR?

L6228DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6228DTR 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 L6228DTR?

For technical support, including L6228DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6228DTR requirements.

6.How does Aetrix verify that L6228DTR is sourced from the original manufacturer or authorized distributors?

All L6228DTR 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 L6228DTR meets industry standards.

7.What is the process for return or replacement of L6228DTR?

All L6228DTR units undergo pre-shipment inspection (PSI). If there is an issue with L6228DTR, 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 L6228DTR part is unused and in its original packaging.

Return procedure for L6228DTR:

1.Submit a request within 90 days.

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

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