STMicroelectronics L6399DTR

Overview

L6399DTR from STMicroelectronics is a high-voltage half-bridge gate driver IC for N-channel MOSFETs and IGBTs, featuring integrated bootstrap diode, 600 V high-side rail capability, ±50 V/ns dV/dt immunity, 290 mA source / 430 mA sink drive strength, and internal 320 ns deadtime. It enables robust motor control in AC/DC and PMAC systems with TTL/CMOS-compatible 3.3 V/5 V inputs and interlocking logic.

For engineers reviewing the L6399DTR datasheet, L6399DTR pinout, L6399DTR application, or L6399DTR equivalent, key selection criteria include bootstrap diode integration, dV/dt noise immunity across −40 °C to +125 °C, interlocked HIN/LIN logic behavior, SO-8 thermal resistance (150 °C/W), and gate drive timing (75 ns rise / 35 ns fall with 1 nF load).

Technical Context

The L6399DTR implements a floating high-side driver architecture using BCD™ "offline" process technology, enabling operation up to 600 V on the VBOOT–VOUT rail. Its interlocking logic enforces mandatory deadtime between HVG and LVG transitions, preventing shoot-through even when both HIN and LIN are asserted high.

It integrates a synchronous bootstrap DMOS structure (R_DS(on) = 120 Ω typ.) that replaces external fast-recovery diodes, with charging dependent on LVG conduction and VOUT proximity to GND. UVLO thresholds are independently set for VCC (9.5 V turn-on) and VBO (9 V turn-on), each with hysteresis (1.5 V and 1.0 V respectively).

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant), 150 °C/W junction-to-ambient thermal resistance, surface-mount footprint per Figure 10 (DocID030402 Rev 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2104STRPBF and UCC27211DR, the L6399DTR uniquely combines integrated bootstrap diode, guaranteed dV/dt immunity across temperature, and hardware interlock-reducing design risk in industrial motor control without external timing components.

Availability

L6399DTR is available at Aetrix Electronics and suitable for industrial motor drives, HVAC fan controllers, and home appliance inverters requiring stable component supply and long-term production continuity.

Supply support for L6399DTR 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, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The L6399 belongs to ST's high-voltage gate driver product line, designed specifically for robust, compact, and cost-effective half-bridge control in AC/DC and BLDC motor systems up to 600 V.

FAQ

What is the purpose of the interlocking function in the L6399DTR?

The interlocking function prevents simultaneous activation of HVG and LVG outputs by enforcing mandatory deadtime when both HIN and LIN inputs are high. This hardware-level protection eliminates shoot-through risk in external N-channel MOSFET/IGBT half-bridges without relying on MCU firmware timing accuracy or external logic.

Can the L6399DTR drive IGBTs directly without external components?

Yes-the L6399DTR provides sufficient 430 mA sink and 290 mA source current to drive standard IGBT gates with Q_g ≤ 30 nC at 100–200 kHz. Its 600 V high-side rating, integrated bootstrap diode, and dV/dt immunity allow direct use in 400 V DC bus applications without gate resistors or external level shifters.

How does the internal bootstrap driver affect C_BOOT selection?

The internal DMOS has R_DS(on) ≈ 120 Ω, introducing voltage drop during C_BOOT charging. For a 30 nC gate charge and 5 µs charging window, drop is ~0.72 V. Designers must size C_BOOT ≥ 10× C_EXT and verify voltage margin after this drop, especially at high frequency or long high-side on-times.

Is the L6399DTR compatible with 3.3 V microcontrollers?

Yes-its LIN and HIN inputs accept 3.3 V TTL/CMOS logic levels with defined thresholds (V_IL ≤ 1.1 V, V_IH ≥ 1.9 V) and built-in hysteresis. No level-shifting circuitry is needed, simplifying interface with modern low-voltage MCUs and DSPs in motor control applications.