ST launches 600V three-phase gate drivers for motor control and inverter applications
STMicroelectronics has expanded its STDRIVE family of three-phase gate drivers with two new 600V devices designed to simplify the development of high-voltage motor drives and inverter systems. The STDRIVE631P and STDRIVE631N integrate three half-bridge drivers for N-channel power MOSFETs and IGBTs within a compact SO-28 package, enabling motor drives and inverters to operate directly from a high-voltage DC bus.
Target applications include fans, pumps and compressors in white goods, as well as other industrial and consumer motor-control systems.
Based on ST’s BCD6-OFFLINE technology, the new gate drivers are engineered for high robustness and can withstand below-ground voltage spikes of up to 100V. Both devices provide gate-driver outputs capable of sourcing 1.0A and sinking 0.85A, with integrated zero-drop bootstrap diodes and matched propagation delays across all three channels to support precise and consistent switching.
Flexible input logic and integrated protection
The STDRIVE631P and STDRIVE631N offer designers flexibility through different input logic configurations. The STDRIVE631P uses positive (active-high) input logic, while the STDRIVE631N features negative (active-low) logic, allowing engineers to select the device best suited to their motor-control architecture.
Both devices incorporate a comprehensive range of protection and control functions to improve system reliability and simplify circuit design.
An integrated comparator with smart shutdown provides protection against fault conditions, including overcurrent and overtemperature. Interlocking and deadtime control help prevent cross-conduction between power switches, while undervoltage lockout (UVLO) independently monitors the high-side and low-side driver supply sections to prevent operation under unsafe or inefficient voltage conditions.
Each gate driver also features dedicated input pins for all three channels and a separate enable pin, allowing straightforward control of low-power shutdown modes.
Compact design reduces component count and PCB complexity
By integrating three half-bridge drivers, bootstrap diodes and multiple protection functions into a single SO-28 package, the STDRIVE631P and STDRIVE631N help reduce external component requirements and overall bill of materials (BOM) costs.
The integrated bootstrap diodes eliminate the need for external high-side supply components, while built-in protection and switching control reduce the complexity associated with discrete gate-driver implementations.
The compact package and integrated functionality also help simplify printed circuit board (PCB) layout and reduce the overall size of motor-drive and inverter designs.
For demanding switching environments, the STDRIVE631 series provides dV/dt transient immunity of ±50V/ns and electrostatic discharge (ESD) protection of up to 2kV according to the human body model (HBM).
Evaluation boards accelerate motor-control development
ST has also introduced two evaluation boards, the EVLSTDRIVE631P and EVLSTDRIVE631N, to help engineers evaluate the new gate drivers and accelerate the development of three-phase motor-control applications.
Each board incorporates a complete three-phase inverter based on STGD6M65DF2 IGBTs. Selectable single-shunt or three-shunt current sensing provides flexibility for different motor-control configurations.
The evaluation boards also feature a 34-pin motor-control connector for interfacing with STM32 microcontrollers, providing a convenient development platform for field-oriented control (FOC) and six-step motor-control algorithms.
stmicroelectronics-stdrive631-600v-three-phase-gate-drivers
stmicroelectronics-stdrive631-600v-three-phase-gate-drivers
https://www.st.com/en/motor-drivers/stdrive631p.html?icmp=tt51685_gl_pron_nov2026
