STMicroelectronics L6227Q

Overview

L6227Q from STMicroelectronics is a DMOS dual full-bridge motor driver IC with integrated PWM current controllers, designed for bipolar stepper and dual/quad 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 R_DS(on) at 25 °C, supports up to 100 kHz switching, and includes non-dissipative overcurrent protection and thermal shutdown.

For engineers reviewing the L6227Q datasheet, L6227Q pinout, L6227Q application, or L6227Q equivalent, key selection considerations include its dual independent constant t_OFF PWM current regulation, slow-decay synchronous rectification, cross-conduction protection, and VFQFPN32 5 mm × 5 mm package compatibility with high-density motor control PCB layouts.

Technical Context

The L6227Q integrates two fully independent power bridges, each with N-channel high-side and low-side DMOS transistors and intrinsic fast freewheeling diodes. Each bridge employs a dedicated constant-off-time PWM current controller using external RC networks (RCA/RCB + ground) to set t_OFF, with blanking time (1 µs) to suppress diode reverse-recovery spikes on SENSE pins.

Logic inputs (IN1A/IN2A/IN1B/IN2B) are TTL/CMOS-compatible with hysteresis (0.25–0.5 V); ENA/ENB enable pins double as open-drain fault outputs tied to internal overcurrent/thermal protection transistors, requiring external R-C networks (e.g., 100 kΩ + 5.6 nF) to program disable timing and noise immunity.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual full-bridge motor driver applications.

Compared with TB6600HG and DRV8876PWPR, the L6227Q uniquely delivers dual independent PWM current control in a thermally optimized 5×5 mm QFN, eliminating external sense resistors and bootstrap components-making it optimal for cost-sensitive, high-density dual-motor or stepper systems operating up to 52 V.

Availability

L6227Q is available at Aetrix Electronics and suitable for industrial automation, medical device motion control, and embedded robotics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for L6227Q 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, motor control, and automotive-grade ICs with vertical manufacturing capability.

The L6227Q belongs to ST's "Motor Driver and Controller" product line, engineered specifically for high-efficiency, high-voltage brushed and stepper motor systems where integration, thermal robustness, and protection autonomy are critical.

FAQ

What is the minimum recommended copper area for thermal management of the L6227Q?

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 vias. For continuous 1.4 A operation per bridge, ≥4 cm² of exposed GND copper under the die pad is strongly advised to maintain T_J < 125 °C at 70 °C ambient.

How does the non-dissipative overcurrent protection work without an external sense resistor?

The L6227Q embeds precision current-mirror circuitry within each high-side DMOS transistor, delivering a scaled replica (1/n) of the output current to internal comparators. When this replica exceeds the internal 2.8 A threshold, the EN pin is actively pulled low via an open-drain MOSFET-eliminating external shunts while preserving accuracy and reducing power loss.

Can the L6227Q drive unipolar stepper motors?

No-the L6227Q is designed exclusively for bipolar stepper motors and dual/quad DC motors. Its dual full-bridge topology requires four terminals per motor (two phases), and its PWM current control relies on bidirectional current flow through each winding. Unipolar steppers require center-tapped windings and different commutation logic not supported by this IC.

What charge pump components are required for reliable VBOOT generation?

A 220 nF ceramic capacitor (C_BOOT), 10 nF capacitor (C_P), and two 1N4148 diodes are specified in the datasheet. C_BOOT must be placed adjacent to VBOOT and GND pins; C_P connects between VCP and GND. Diodes must be fast-switching types with ≤4 ns trr; placement within 5 mm of the IC ensures stable 10 V bootstrap voltage at 100 kHz switching.