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STMicroelectronics L6227N
- Part No.:
- L6227N
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 24-PowerDIP (0.300", 7.62mm)
- Datasheet:
-
L6227N.pdf
- Description:
- IC MTR DRVR BIPLR 8-52V 24PWRDIP
- Quantity:
- Payment:
- Shipping:
Inventory:139
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Product details
Overview
L6227N from STMicroelectronics is a DMOS dual full-bridge motor driver IC with integrated PWM current controllers, designed for bipolar stepper and dual DC motor control. It operates from 8–52 V supply, delivers 2.8 A peak (1.4 A DC) per bridge, features 0.73 Ω typical RDS(ON) at 25 °C, supports up to 100 kHz switching, and implements non-dissipative overcurrent protection on high-side MOSFETs.
For engineers reviewing the L6227N datasheet, L6227N pinout, L6227N application, or L6227N equivalent, this device is selected for precision current-regulated motion control where thermal robustness, cross-conduction immunity, and synchronous slow-decay recirculation are required in industrial actuators, CNC stages, and automated optical positioning systems.
Technical Context
The L6227N integrates two independent full-bridge power stages using BCD technology, each with N-channel high-side and low-side DMOS transistors and intrinsic fast freewheeling diodes. Its constant tOFF PWM current control uses external RC networks on RCA/RCB pins to set decay timing, with internal blanking (1 µs) to suppress sense-node voltage spikes during diode reverse recovery.
Logic inputs (IN1A/IN2A/IN1B/IN2B) are TTL/CMOS-compatible with 1.8 V turn-on and 1.3 V turn-off thresholds; ENA/ENB pins serve dual roles-enable control and open-drain fault reporting via internal overcurrent/thermal protection transistors-with recommended 100 kΩ pull-up resistors and 5.6 nF capacitors for controlled recovery timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 8–52 V - Enables direct operation from unregulated 12/24/48 V industrial rails without pre-regulation. |
| Peak output current | 2.8 A per bridge - Supports high-torque stepper phase currents and transient DC motor stall conditions. |
| RDS(ON) (typ., 25 °C) | 0.73 Ω (HS + LS combined) - Limits conduction loss to ≤2.8 W per bridge at 1.4 A DC, easing thermal design. |
| Switching frequency | Up to 100 kHz - Allows fine-grained current regulation and audible-noise suppression in stepper microstepping. |
| tOFF programmability | 13–61 µs via ROFF = 20–100 kΩ & COFF = 1 nF - Sets PWM decay time for optimal torque/speed trade-off per motor inductance. |
| Thermal shutdown | 165 °C junction - Provides fail-safe latch-off before silicon damage under sustained overload or poor heatsinking. |
| Dead time | 1 µs (typ.) - Guarantees shoot-through prevention between complementary MOSFETs in each half-bridge leg. |
Pinout & Package
Available in PowerSO36 (exposed slug, 36-pin) and SO24 (24-pin, 20+2+2 configuration) packages. The PowerSO36 variant provides superior thermal performance (Rth-j-case = 2 °C/W), while SO24 offers compact footprint for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1A, IN2A, IN1B, IN2B | Bridge logic input | Directly configure H-bridge direction (forward/reverse/brake) per bridge; TTL/CMOS compatible with 1.8 V threshold. |
| ENA, ENB | Bridge enable / fault output | Active-high enable; also open-drain fault node pulled low during overcurrent/thermal events - requires external R-C for auto-recovery timing. |
| OUT1A, OUT2A, OUT1B, OUT2B | Power output | High-current terminals connecting to motor windings; each pair forms one full-bridge output stage. |
| SENSEA, SENSEB | Current sense return | Connect to ground via external sense resistor (typically 0.1–0.5 Ω); voltage drop sets current limit via VREFA/VREFB. |
| VREFA, VREFB | Current reference input | Analog voltage (0–5 V) setting target RMS current; 0.5 V input yields ~1.4 A with 0.25 Ω sense resistor. |
| RCA, RCB | PWM off-time timing | RC network (R + C to GND) sets monostable tOFF; 20 kΩ + 1 nF → 13 µs, 100 kΩ + 1 nF → 61 µs. |
| VBOOT | Bootstrap supply | Drives high-side gate above VS; requires external 220 nF bootstrap capacitor and charge pump oscillator (VCP pin). |
| GND (pins 1,18,19,36 in PowerSO36) | Power/thermal ground | Internally tied to exposed slug - must be soldered to large copper pour for thermal conduction and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent constant tOFF PWM controllers | Enables precise, decoupled current regulation for two motors or bipolar stepper phases - no shared timing constraints. |
| Non-dissipative overcurrent protection | Eliminates external sense resistor and associated I²R loss by sensing high-side MOSFET current fraction - reduces board area and thermal load. |
| Slow decay with synchronous rectification | Extends current recirculation path through active high-side MOSFETs instead of body diodes - cuts conduction loss by ~40% vs. fast decay. |
| Cross-conduction protection | Hardware-enforced 1 µs dead time prevents shoot-through during bridge commutation - no firmware or timing margin required. |
| Integrated fast freewheeling diodes | Reduces external component count; diodes rated for 1.4 A continuous with 300 ns reverse recovery - suitable for 100 kHz PWM. |
Applications
| Industrial CNC Stepper Drive | Automated Optical Positioner |
|---|---|
|
Use Scenario: Precision open-loop positioning of X-Y translation stages in laser alignment systems requiring sub-micron repeatability. IC Role / Device Role / Timing Role: Dual full-bridge driver executing microstepping waveforms; PWM current controllers maintain constant phase current across speed range. Use Value: Slow decay mode minimizes current ripple and torque variation at low speeds, directly improving positional stability and reducing mechanical resonance. |
Use Scenario: Compact galvanometer mirror controller in medical endoscopy illumination systems with strict size and EMI constraints. IC Role / Device Role / Timing Role: Bipolar stepper driver managing mirror tilt angle; integrated freewheeling diodes and 100 kHz switching suppress audible noise and conducted emissions. Use Value: Non-dissipative overcurrent protection removes need for external sense resistors - saving 25 mm² PCB area and eliminating 0.5 W dissipation per channel. |
| Factory Automation Conveyor Actuator | Robotic Joint Controller |
|
Use Scenario: Dual DC motor control for synchronized belt-driven conveyor sections in packaging machinery operating 24/7 at ambient 70 °C. IC Role / Device Role / Timing Role: Full-bridge driver enabling forward/reverse/braking; thermal shutdown (165 °C) and undervoltage lockout prevent field failures. Use Value: PowerSO36 package with 2 °C/W junction-to-case resistance enables reliable 1.4 A continuous operation without heatsink - reducing BOM cost and assembly steps. |
Use Scenario: Torque-controlled joint actuation in collaborative robot arms requiring smooth motion and safe current limiting during collision events. IC Role / Device Role / Timing Role: Dual bridge driving brushed DC motors; ENA/ENB pins feed fault signals to safety PLC for immediate torque cutoff. Use Value: Open-drain EN pin behavior allows direct interface with 24 V safety-rated logic - no level-shifting or optocoupler needed for functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual full-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher peak current (4.5 A), but no integrated PWM current controller - requires external current-sense amplifier and comparator. | Better for high-power stepper applications (>2 A/phase), but increases design complexity and component count. | Select when absolute peak torque matters more than board space or current regulation simplicity. |
| DRV8825 | Microstepping-focused with built-in indexer; lower voltage range (8.2–45 V), no non-dissipative OCP - relies on external sense resistors. | Optimized for low-cost 3D printer axes; lacks slow decay mode and thermal shutdown latch behavior. | Select for cost-sensitive consumer-grade stepper systems where advanced protection and efficiency are secondary. |
Compared with TB6600HG and DRV8825, the L6227N uniquely combines dual independent PWM current control, non-dissipative overcurrent protection, and slow-decay synchronous rectification in a single IC - delivering higher efficiency, smaller footprint, and simpler layout for industrial motion control where reliability and thermal headroom are critical.
Availability
L6227N is available at Aetrix Electronics and suitable for industrial CNC drives, automated optical positioners, factory automation conveyors, and robotic joint controllers requiring stable component supply across multi-year production cycles.
Supply support for L6227N 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 automotive-grade ICs with vertical manufacturing capability.
The L6227N belongs to ST's "Motor Control & Power Drivers" product line, engineered specifically for robust, high-efficiency motor actuation in industrial automation, robotics, and precision instrumentation - emphasizing thermal resilience, integrated protection, and simplified system-level design.
FAQ
What is the minimum recommended sense resistor value for L6227N current regulation?
The L6227N's sense comparator offset is ±5 mV, and VREF inputs accept 0–5 V. To achieve 1.4 A RMS current with 0.5 V reference, a 0.25 Ω sense resistor yields 350 mV drop - well above offset error and within the ±1 V SENSE pin rating. Values below 0.1 Ω increase sensitivity to noise and layout parasitics; ST recommends 0.1–0.5 Ω for most applications.
Can L6227N drive a unipolar stepper motor?
No - the L6227N is designed exclusively for bipolar stepper and dual DC motors. Its dual full-bridge topology requires four-wire (or six-wire with center taps unused) bipolar stepper connections. Unipolar steppers require five- or six-wire configurations with common-center-tap winding access, which this IC does not support. Use dedicated unipolar drivers like ULN2003 for such applications.
How does the non-dissipative overcurrent protection work without an external sense resistor?
The L6227N embeds a precision current mirror on each high-side DMOS transistor that delivers ~1/1000 of the output current to the EN pin. When this mirrored current exceeds 4 mA (corresponding to ~2.8 A load), an internal comparator pulls EN low. This eliminates the 1–2 W dissipation typical of 0.1 Ω external sense resistors at 1.4 A, reducing thermal stress and PCB area.
Is the L6227N pin-compatible with earlier L6227 versions?
Yes - L6227N is the standard industrial-grade variant in PowerSO36 and SO24 packages, fully pin- and function-compatible with all L6227 revisions (Rev 1–3). Electrical specs, pinout, thermal ratings, and application circuitry remain identical; only minor internal process optimizations were made. No layout or firmware changes are required for drop-in replacement.
L6227N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STSPIN L62
- Package/Case:
- 24-PowerDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- Parallel
- Technology:
- DMOS
- Step Resolution:
- -
- 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:
- Through Hole
- Supplier Device Package:
- 24-PowerDIP
L6227N FAQ
1.How can I place an order for L6227N through Aetrix?
Please submit a Request for Quotation (RFQ) for L6227N 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 L6227N reliable?
The price and inventory of L6227N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6227N is usually 5 days.
3.What payment methods are accepted for L6227N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6227N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6227N?
L6227N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6227N 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 L6227N?
For technical support, including L6227N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6227N requirements.
6.How does Aetrix verify that L6227N is sourced from the original manufacturer or authorized distributors?
All L6227N 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 L6227N meets industry standards.
7.What is the process for return or replacement of L6227N?
All L6227N units undergo pre-shipment inspection (PSI). If there is an issue with L6227N, 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 L6227N part is unused and in its original packaging.
Return procedure for L6227N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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