STMicroelectronics L6206N

Overview

L6206N from STMicroelectronics is a DMOS dual full-bridge motor driver IC designed for bipolar stepper and dual/quad DC motor control, featuring 5.6 A peak output current per bridge, 0.3 Ω typical high-side R_DS(ON) at 25 °C, and programmable overcurrent protection across both bridges. It operates from 8–52 V supply and supports up to 100 kHz PWM switching in industrial motion systems.

For engineers reviewing the L6206N datasheet, L6206N pinout, L6206N application, or L6206N equivalent, key selection criteria include its non-dissipative high-side overcurrent detection, integrated fast freewheeling diodes, cross-conduction protection, thermal shutdown at 165 °C, and dual-bridge paralleling capability for current scaling.

Technical Context

The L6206N integrates two independent full-bridge power stages using BCD technology, each with matched N-channel high-side and low-side DMOS transistors. Its charge pump (VCP output, 600 kHz typ.) generates bootstrap voltage (VBOOT) to drive upper MOSFETs, enabling rail-to-rail gate drive without external high-voltage supplies.

Overcurrent detection is implemented via on-die current sensing in each high-side MOSFET, referenced to an internal I_REF set by external PROGCLA/PROGCLB resistors (e.g., 5 kΩ → 4.42 A ±10%). Diagnostic open-drain outputs (OCDA/OCDB) assert low on fault, enabling direct feedback to ENA/ENB for automatic shutdown with user-programmable disable time via R_EN/C_EN.

Key Specifications

Pinout & Package

Available in PowerSO36 (exposed slug, 4 GND pins tied internally) and SO24 (20 + 2 + 2 pin count) packages. Both support PCB heat dissipation via GND pins; PowerSO36 offers lower R_th-j-case (1 °C/W) for higher-power operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and VNH7040AS, the L6206N uniquely delivers dual full-bridge integration at 5.6 A peak with hardware-programmable overcurrent thresholds and diagnostic feedback-enabling compact, self-protecting motor control without external sensing or safety logic.

Availability

L6206N is available at Aetrix Electronics and suitable for industrial motion control, automated material handling, and embedded actuation systems requiring stable component supply and long-term production continuity.

Supply support for L6206N 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.

The L6206N belongs to ST's high-voltage motor driver product line, engineered specifically for robust, high-current industrial and automation applications where integrated protection and thermal resilience are critical.

FAQ

What package variants does the L6206N come in, and how do they differ thermally?

The L6206N is offered in PowerSO36 and SO24 packages. PowerSO36 features an exposed thermal slug internally connected to four GND pins, achieving 1 °C/W junction-to-case thermal resistance-ideal for high-power operation with heatsink attachment. The SO24 variant has higher thermal resistance (14 °C/W junction-to-pins) and relies on PCB copper for heat dissipation, making it suitable for moderate-duty applications without external cooling.

How is overcurrent protection configured and what happens when it triggers?

Overcurrent protection is set per bridge using resistors from PROGCLA/PROGCLB to GND (e.g., 5 kΩ = 4.42 A). When exceeded, the corresponding OCDA or OCDB pin pulls low via an internal 4 mA open-drain transistor. This signal can be fed directly to ENA/ENB to disable the bridge, with shutdown duration controlled by external R_EN/C_EN networks-enabling precise, repeatable fault response without software intervention.

Can the L6206N drive a unipolar stepper motor, and if not, why?

No-the L6206N is not suitable for unipolar stepper motors. It is designed exclusively for dual full-bridge operation, which requires four-terminal bipolar windings. Unipolar steppers use center-tapped windings and require five- or six-wire connections with single-ended drive topology, incompatible with the L6206N's complementary H-bridge outputs and sensing architecture.

What external components are mandatory for basic L6206N operation?

Mandatory components include: (1) Bootstrap capacitors (C_BOOT = 220 nF, C_P = 10 nF) and diodes (1N4148) for VCP-driven charge pump; (2) Input bulk capacitor (≥100 µF) and local 100 nF ceramic cap across VSA/VSB; (3) Pull-up resistors on ENA/ENB if not driven by OCD; (4) Grounding resistors on PROGCLA/PROGCLB-floating is prohibited. No external current-sense resistors are needed due to integrated OCD.