STMicroelectronics L6399D

Overview

L6399D 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, and internal 320 ns deadtime. It delivers 290 mA source / 430 mA sink drive current with 75/35 ns rise/fall times (1 nF load), and supports 3.3 V/5 V TTL/CMOS logic inputs - used in motor control stages of HVAC compressors and industrial AC drives.

For engineers reviewing the L6399D datasheet, L6399D pinout, L6399D application, or L6399D equivalent, key selection criteria include bootstrap diode integration, interlocking logic behavior, dV/dt noise immunity at full temperature range, and SO-8 package compatibility with high-voltage floating output routing.

Technical Context

The L6399D implements dual-channel complementary logic with hardware interlocking to prevent shoot-through: simultaneous HIN/LIN high states force both outputs low, and a fixed 225–415 ns deadtime enforces minimum off-time before opposite channel activation. Its high-side section uses a floating structure referenced to OUT, sustaining up to 600 V rail voltage while maintaining logic-level input compatibility down to 3.3 V.

Bootstrap charging is managed via an integrated DMOS-based diode (R_DS(on) = 120 Ω typ.) synchronized with LVG, eliminating external fast-recovery diodes. UVLO thresholds are independently set for VCC (9.5 V turn-on, 8.0 V turn-off) and VBO (9.0 V turn-on, 8.0 V turn-off), each with hysteresis to suppress noise-induced toggling.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant), surface-mount, 150 °C/W junction-to-ambient thermal resistance. Pin 1–4 on left side (LIN, HIN, VCC, GND), pins 5–8 on right (LVG, OUT, HVG, BOOT).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2104S and UCC27201A, the L6399D provides unique value through its combination of integrated bootstrap diode, guaranteed dV/dt immunity over full temperature range, and hardware-enforced interlocking - reducing validation effort and improving field reliability in cost-sensitive motor control systems.

Availability

L6399D is available at Aetrix Electronics and suitable for HVAC compressor control, industrial AC drive inverters, and home appliance motor modules requiring stable component supply and long-lifecycle support.

Supply support for L6399D 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 L6399D belongs to ST's high-voltage gate driver product line, designed specifically for robust, compact, and cost-effective motor control in appliances and factory automation systems using N-channel power switches.

FAQ

What is the maximum allowable bootstrap capacitor (CBOOT) voltage drop during operation?

The L6399D's internal bootstrap diode introduces a voltage drop proportional to gate charge and charging time (V_drop ≈ Q_gate × R_DS(on) / T_charge). With typical R_DS(on) = 120 Ω, a 30 nC MOSFET gate charge, and 5 µs charging window, drop is ~0.72 V. Designers must ensure remaining BOOT voltage exceeds 8.0 V (VBO UVLO threshold) after this drop to maintain high-side operation.

Can L6399D drive IGBTs with gate-emitter threshold voltages above 5 V?

Yes - the L6399D delivers 15 V gate drive (VCC = 15 V) with 430 mA sink capability, sufficient to rapidly discharge IGBT gates with V_GE(th) up to 6 V. Its 75 ns rise time into 1 nF load ensures fast turn-on, and the 320 ns deadtime prevents overlap during commutation, critical for IGBT-based inverters operating at ≤800 kHz.

How does the interlocking function behave when both HIN and LIN are held high?

Per the truth table in the datasheet, simultaneous high states on HIN and LIN force both LVG and HVG outputs low - a hardware-level interlock independent of timing or software. This state persists until one input falls low, after which the corresponding output activates only after the internal deadtime expires, ensuring no shoot-through under fault or misconfigured logic conditions.

Is external bootstrap diode replacement ever necessary with L6399D?

Yes - when CBOOT charging time is insufficient (e.g., very low duty cycle or high-frequency operation where LVG on-time is too short), or when VOUT remains elevated for extended periods (e.g., synchronous rectification topologies). In such cases, an external 600 V fast-recovery diode (e.g., STTH1R06) may be added in parallel with the internal path to ensure reliable BOOT voltage replenishment.