STMicroelectronics L6389ED

Overview

L6389ED from STMicroelectronics is a high-voltage half-bridge gate driver IC designed to control power MOSFETs and IGBTs in high-side/low-side configurations. It supports up to 600 V rail voltage, delivers 400 mA source / 650 mA sink output current, features integrated bootstrap diode and interlocking/deadtime protection, and operates with 3.3 V/5 V/15 V CMOS/TTL inputs - used in motor drives for PMAC and induction heating systems.

For engineers reviewing the L6389ED datasheet, L6389ED pinout, L6389ED application, or L6389ED equivalent, key selection criteria include dV/dt immunity (±50 V/ns), UVLO thresholds on both VCC and VBOOT, SO-8 package thermal resistance (150 °C/W), and bootstrap driver R_DS(on) (125 Ω).

Technical Context

The L6389ED implements dual independent drivers with interlocked logic and programmable deadtime (325–615 ns) to prevent shoot-through in half-bridge topologies. Its floating high-side section uses bootstrap charging synchronized with LVG activation and integrates a patented DMOS-based bootstrap diode with 125 Ω typical on-resistance.

Input logic accepts 3.3 V/5 V/15 V CMOS/TTL levels with hysteresis and internal pull-down resistors (600–1150 kΩ). UVLO protection is implemented separately on VCC (9.1–10.1 V turn-on, 7.9–8.8 V turn-off) and VBOOT (8.5–10.5 V turn-on, 7.2–9.2 V turn-off), each with 0.9 V hysteresis.

Key Specifications

Pinout & Package

Package: SO-8 (small outline, 150 °C/W junction-to-ambient thermal resistance, ECOPACK® compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage half-bridge gate driver applications.

Compared with IR2110PbF and UCC27211D, the L6389ED offers unique integration of bootstrap diode, hardware interlock, and fixed deadtime - reducing external components and eliminating timing-critical PCB routing while maintaining 600 V capability and ±50 V/ns noise immunity.

Availability

L6389ED is available at Aetrix Electronics and suitable for industrial motor drives, induction heating inverters, and HVAC blower systems requiring stable component supply across extended production lifecycles.

Supply support for L6389ED 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, specializing in power management, analog, microcontrollers, and automotive-grade ICs.

The L6389ED belongs to ST's BCD™ "offline" high-voltage driver product line, engineered specifically for robust half-bridge control in mains-connected industrial and appliance power stages.

FAQ

What is the purpose of the interlocking function in the L6389ED?

The interlocking function prevents both HVG and LVG outputs from being simultaneously high, even if both HIN and LIN inputs are asserted. It enforces hardware-level mutual exclusion using internal logic, eliminating reliance on external timing control or software coordination to avoid shoot-through in half-bridge configurations.

Can the L6389ED drive IGBTs directly without external gate resistors?

While the L6389ED provides 400 mA source and 650 mA sink current, external gate resistors are still required to control switching speed, suppress ringing, and limit peak current during Miller plateau crossing. The datasheet specifies performance with 1 nF capacitive load but does not eliminate need for series gate resistance in real-world IGBT/MOSFET applications.

How does the integrated bootstrap diode affect thermal performance?

The integrated DMOS-based bootstrap diode has 125 Ω typical R_DS(on), causing ~1 V drop during C_BOOT charging at high frequencies. This dissipation contributes to total chip power loss and must be included in thermal calculations - especially above 100 kHz where charging duty cycle increases and average current rises.

Is the L6389ED compatible with 3.3 V microcontroller GPIOs without level shifting?

Yes - the L6389ED accepts 3.3 V logic inputs directly. Its input threshold is defined as V_IL ≤ 1.1 V and V_IH ≥ 1.8 V, with hysteresis and internal pull-down resistors (600–1150 kΩ), ensuring reliable recognition of standard 3.3 V CMOS logic levels without external level-shifting circuitry.