STMicroelectronics L6206Q

Overview

L6206Q from STMicroelectronics is a DMOS dual full-bridge motor driver IC designed for bipolar stepper and dual/quad DC motor control, featuring 8–52 V supply range, 5.6 A peak output current per bridge, 0.34 Ω typical high-side R_DS(on) at 25 °C, programmable overcurrent detection via PROGCLA/PROGCLB pins, and integrated fast freewheeling diodes.

For engineers reviewing the L6206Q datasheet, L6206Q pinout, L6206Q application, or L6206Q equivalent, this device supports high-frequency (up to 100 kHz) PWM-driven H-bridge operation with cross-conduction protection, thermal shutdown at 165 °C, diagnostic open-drain OCD outputs, and paralleled-bridge configurations for increased current capability.

Technical Context

The L6206Q integrates two independent full-bridge power stages using BCDmultipower technology, each with matched N-channel DMOS high-side and low-side switches. It employs an internal charge pump (600 kHz typical, 10 V amplitude on VCP) to drive high-side gates above VS, enabling bootstrap operation without external high-voltage supplies.

Non-dissipative overcurrent detection monitors high-side current via on-chip sensing cells-eliminating external shunt resistors-and compares it against a user-programmable threshold (via 5 kΩ–40 kΩ pull-down on PROGCLA/PROGCLB), with ±10% accuracy across –25 to +125 °C junction temperature.

Key Specifications

Pinout & Package

Package: VFQFPN48 (7 × 7 × 1.0 mm), thermally enhanced with exposed EPAD connected to GND for PCB heat dissipation.

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 L6206Q uniquely combines programmable overcurrent protection, dual independent diagnostics, paralleling capability for 11.2 A OCD, and bootstrap-based high-side drive-all in a thermally optimized 7 × 7 mm VFQFPN package without requiring MCU supervision.

Availability

L6206Q is available at Aetrix Electronics and suitable for bipolar stepper motor control, dual DC motor drive, and industrial actuator modules requiring stable component supply, long-lifecycle assurance, and production-ready thermal performance.

Supply support for L6206Q 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, designing and manufacturing analog, mixed-signal, power, and microcontroller products for industrial, automotive, and consumer markets.

The L6206Q belongs to ST's "Motor Control Drivers" product line, engineered specifically for high-efficiency, high-reliability brushed and stepper motor systems where integrated protection, thermal resilience, and layout simplicity are critical.

FAQ

What is the minimum recommended external bootstrap capacitor value for reliable high-side gate drive?

The datasheet specifies C_BOOT = 220 nF as the recommended value for stable bootstrap operation across 8–52 V supply and 100 kHz switching. This value ensures sufficient charge retention during worst-case duty cycles and compensates for leakage in the internal charge pump diode. Using <100 nF risks insufficient gate voltage during extended high-side conduction, leading to increased R_DS(on) and thermal stress.

Can L6206Q drive a unipolar stepper motor?

No-the L6206Q is designed exclusively for bipolar stepper motors and dual/quad DC motors. Its dual full-bridge topology requires center-tapped or dual-winding configurations that deliver bidirectional current per phase. Unipolar steppers rely on five-lead wiring with common taps and require separate low-side switching per phase, which this IC does not support.

How is thermal performance affected when connecting NC pins to GND?

Connecting unused NC pins (e.g., pins 1, 4, 5, 7, 8, 9, 12, 14, 24, 25, 28, 29, 30, 32, 33, 36, 37, 47) to GND improves thermal resistance by ~10–15% via additional copper pathways to the EPAD. This lowers junction-to-PCB thermal impedance, allowing higher sustained current (e.g., 2.5 A RMS per bridge) without exceeding 125 °C T_j under standard 2-layer 1 oz Cu layout.

Is it safe to tie ENA and ENB together for synchronous control of both bridges?

Yes-ENA and ENB may be tied together to a single controller signal for synchronized enable/disable. However, doing so forfeits independent fault isolation: if OCDA pulls low due to Bridge A overcurrent, both bridges shut down. For applications requiring continued operation of one bridge during the other's fault, keep ENA/ENB separate and route OCD outputs to distinct µC inputs.