STMicroelectronics L6227DTR

Overview

L6227DTR 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 R_DS(ON) at 25 °C, supports up to 100 kHz switching, and implements non-dissipative overcurrent protection and slow-decay synchronous rectification.

For engineers reviewing the L6227DTR datasheet, L6227DTR pinout, L6227DTR application, or L6227DTR equivalent, this device is selected for precision current-regulated motor drives requiring thermal robustness, cross-conduction immunity, and compact dual-bridge integration in industrial motion and embedded positioning systems.

Technical Context

The L6227DTR integrates two independent BCD-technology full bridges, each with N-channel high-side and low-side DMOS power transistors and intrinsic fast freewheeling diodes. Its constant t_OFF PWM current control uses external RC networks on RCA/RCB pins to set recirculation time, while blanking (1 µs) prevents false triggering from diode reverse-recovery spikes.

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-with internal overcurrent/thermal protection transistors tied directly to their outputs.

Key Specifications

Pinout & Package

Available in PowerSO-36 (exposed slug, pins 1/18/19/36 internally connected to GND) and SO-24 (20 + 2 + 2 pin count) packages. The L6227DTR variant corresponds to the PowerSO-36 package, optimized for thermal dissipation with R_th-j-case = 2 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6600HG and DRV8876PWPR, the L6227DTR uniquely combines dual full-bridge topology, non-dissipative overcurrent protection, and programmable slow-decay PWM in a single PowerSO-36 package - reducing component count, PCB area, and design validation effort for multi-axis motion systems.

Availability

L6227DTR is available at Aetrix Electronics and suitable for industrial automation, medical device actuation, and precision motion control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6227DTR 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 capabilities.

The L6227DTR belongs to ST's L62xx family of intelligent motor drivers, engineered specifically for cost-sensitive, thermally demanding industrial motion applications requiring high integration and robust protection.

FAQ

What is the minimum recommended external RC network for t_OFF programming?

The minimum valid RC combination is R_OFF = 20 kΩ and C_OFF = 0.47 nF, yielding t_OFF(MIN) ≈ 6.6 µs. This setting supports high-frequency PWM (up to 100 kHz) while maintaining stable current regulation; smaller values risk noise sensitivity and inconsistent off-time due to incomplete RC charging.

How does the non-dissipative overcurrent protection function without a sense resistor?

The L6227DTR embeds precision current-mirror circuitry within each high-side DMOS transistor, delivering a scaled replica (typically 1/2000) of the output current to the EN pin. When this replica exceeds the internal reference, an open-drain MOS pulls EN below 1.3 V, disabling the bridge - eliminating external shunt losses while retaining ±15% threshold accuracy.

Can L6227DTR drive unipolar stepper motors?

No - the L6227DTR is designed exclusively for dual full-bridge topologies and lacks the center-tap switching architecture required for unipolar stepper control. Its truth table and output configuration support only bipolar winding drive (H-bridge mode), making it incompatible with 5- or 6-wire unipolar steppers.

What thermal derating applies when using the SO-24 package instead of PowerSO-36?

In SO-24, R_th-j-amb rises to 52 °C/W (vs. 16 °C/W in PowerSO-36 with 16 vias), limiting continuous current to ≤0.8 A per bridge at 70 °C ambient. Derating curves in Section 8.2 of the datasheet require ≥6 cm² copper pour and thermal vias to sustain 1.4 A RMS; PowerSO-36 is strongly recommended for full-spec operation.