STMicroelectronics L6205N

Overview

L6205N from STMicroelectronics is a DMOS dual full-bridge motor driver IC designed for bipolar stepper and dual/quad DC motor control, featuring 5.6A peak output current (2.8A DC), 0.34Ω typical high-side R_DS(ON) at 25°C, 8–52V operating supply voltage, non-dissipative overcurrent protection, and integrated fast freewheeling diodes - deployed in industrial motion control and automated valve actuation systems.

For engineers reviewing the L6205N datasheet, L6205N pinout, L6205N application, or L6205N equivalent, this page delivers verified electrical parameters, thermal resistance data for PowerDIP20 mounting, bridge enable logic behavior, bootstrap charge pump timing, and parallel-bridge configuration trade-offs - all critical for motor driver PCB layout and fault-recovery timing design.

Technical Context

The L6205N integrates two independent full-bridge power stages using MultiPower-BCD technology, each with matched N-channel high-side and low-side DMOS transistors. Its cross-conduction protection enforces a 0.5–1 µs dead time between complementary switch transitions to prevent shoot-through.

It employs an internal 600 kHz charge pump oscillator (VCP pin) to generate V_BOOT for high-side gate drive, enabling operation with N-channel MOSFETs on both sides of each bridge. Overcurrent detection is implemented via precision current-sensing cells embedded in the high-side DMOS source paths - eliminating external sense resistors and associated power loss.

Key Specifications

Pinout & Package

L6205N is supplied in PowerDIP20 (16+2+2) package with exposed slug internally connected to pins 1, 10, 11, and 20 (all GND). Thermal resistance: R_th-j-pins = 12°C/W; R_th-j-amb = 40°C/W on 6 cm² copper (FR4, bottom side).

Key Features

Applications

Equivalent & Alternatives

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

Compared with L6206N, the L6205N delivers 25% higher peak current and better thermal robustness for industrial loads, while TB6612FNG trades voltage/current capability for integration and low-voltage compatibility - making it unsuitable as a drop-in replacement in 24–48 V motor control.

Availability

L6205N is available at Aetrix Electronics and suitable for industrial motion control, automated valve actuation, and conveyor system design requiring stable component supply across extended production lifecycles.

Supply support for L6205N 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 specializing in power management, motor control, and automotive-grade analog/mixed-signal ICs.

The L6205N belongs to ST's MultiPower-BCD motor driver product line, engineered specifically for ruggedized industrial and automation applications demanding high-voltage operation, integrated protection, and thermal resilience.

FAQ

What is the minimum recommended bootstrap capacitor value for L6205N?

The datasheet specifies 220 nF for C_BOOT in the charge pump circuit. This value ensures sufficient charge storage to maintain V_BOOT ≥ V_S + 10 V during high-duty-cycle operation at 100 kHz switching. Using ceramic capacitors with low ESR is mandatory; values below 150 nF risk insufficient gate drive voltage and high-side FET dropout under load.

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

The L6205N embeds precision current-mirror cells within each high-side DMOS structure. These deliver ~1/1000 of the output current to the SENSEA/SENSEB pins, which are compared against an internal 5.6 A reference. No external resistor is needed because sensing occurs at the silicon level - eliminating power loss, layout sensitivity, and tolerance drift inherent in discrete shunts.

Can L6205N drive a unipolar stepper motor?

No - the L6205N is designed exclusively for bipolar stepper motors and dual/quad DC motors. Its dual full-bridge topology requires four terminals per motor winding and cannot interface with the center-tapped configuration of unipolar steppers. Attempting unipolar operation would result in incorrect phase energization and potential device damage due to improper current paths.

What is the purpose of the multiple GND pins (1,5,6,15,16,20) in PowerDIP20?

These six GND pins serve dual functions: signal reference for logic inputs and thermal conduction paths from the die slug to the PCB. Pins 1,10,11,20 are internally bonded to the exposed metal slug, enabling direct heat transfer to copper pour. Distributing GND across multiple pins also minimizes ground bounce and improves noise immunity in high-current switching environments.