STMicroelectronics L6206D

Overview

L6206D 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.

For engineers reviewing the L6206D datasheet, L6206D pinout, L6206D application, or L6206D equivalent, this device is selected for precision current-controlled motor drives requiring integrated diagnostics, cross-conduction protection, thermal shutdown, and non-dissipative high-side current sensing-especially where board space and heat dissipation are constrained.

Technical Context

The L6206D integrates two independent full-bridge power stages using BCD technology, each with matched N-channel high-side and low-side DMOS transistors and intrinsic fast freewheeling diodes. Deadtime (0.5–1 µs) prevents shoot-through, and an internal 600 kHz charge pump (VCP output) generates bootstrap voltage (VBOOT) for high-side gate drive.

Overcurrent detection is implemented via non-dissipative high-side current mirroring-each bridge's PROGCLA/PROGCLB pins set threshold via external resistor (e.g., 5 kΩ → ~4.42 A), while OCDA/OCDB open-drain outputs signal fault conditions. Thermal shutdown activates at 165 °C (15 °C hysteresis), and undervoltage lockout ensures operation only above 6.6 V.

Key Specifications

Pinout & Package

Available in PowerSO36 (exposed slug, R_th-j-case = 1 °C/W) and SO24 (20 + 2 + 2 lead count) packages. Both use GND-connected thermal pads/pins for PCB heat extraction.

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 L6206D uniquely combines dual full-bridge topology, 5.6 A peak current, resistor-programmable overcurrent, and integrated diagnostics-making it optimal for space-constrained industrial motion systems requiring robust, self-protecting motor control without external sensing.

Availability

L6206D is available at Aetrix Electronics and suitable for bipolar stepper motor control, dual DC motor drive, quad half-bridge actuation, and industrial actuator modules requiring stable component supply across long-lifecycle production programs.

Supply support for L6206D 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 analog/mixed-signal ICs.

The L6206D belongs to ST's high-voltage motor driver product line, engineered specifically for industrial and automation applications demanding high-current, thermally robust, and diagnostics-rich H-bridge solutions.

FAQ

What package variants does the L6206D support, and how do they differ thermally?

The L6206D is offered in PowerSO36 and SO24 packages. PowerSO36 features an exposed thermal slug with R_th-j-case = 1 °C/W, enabling direct heatsink attachment and superior thermal performance. SO24 relies on PCB copper for heat dissipation (R_th-j-amb = 35–51 °C/W depending on layout), making it suitable for lower-power or space-constrained designs where heatsinking isn't feasible.

How is overcurrent protection configured, and what resistor values yield common thresholds?

Overcurrent threshold is set per bridge using PROGCLA/PROGCLB resistors to GND. With R_CL = 0 Ω (pin grounded), threshold is 5.6 A ±30%. At 5 kΩ, it drops to 4.42 A ±10%; at 39 kΩ, it reaches 0.57 A ±10%. Resistors must be placed close to the pin, and floating is prohibited-designs require explicit grounding or resistor termination.

Can the L6206D drive unipolar stepper motors, and what modifications are needed?

No-the L6206D is optimized for bipolar stepper motors using full-bridge winding control. Unipolar steppers require center-tapped windings and single-ended switching, which this IC does not support. Attempting unipolar operation would leave half the bridge unused and risk incorrect current paths; dedicated unipolar drivers like ULN2003 are recommended instead.

What external components are mandatory for basic operation, and why?

Mandatory components include: (1) 220 nF ceramic C_BOOT between VBOOT and VS, (2) 10 nF CP capacitor from VCP to GND, (3) 100–200 nF high-quality ceramic decoupling cap between VSA/VSB and GND, and (4) pull-up resistors on OCDA/OCDB for MCU interfacing. These ensure stable bootstrap voltage generation, charge pump operation, power rail filtering, and fault signal integrity-omitting any risks latch-up or erratic switching.