STMicroelectronics L6386ADTR

Overview

L6386ADTR from STMicroelectronics is a high-voltage dual-channel gate driver IC designed for asymmetrical half-bridge topologies, capable of simultaneously driving high-side (up to 600 V rail) and low-side power MOSFETs or IGBTs. It delivers 400 mA source / 650 mA sink peak output current, achieves 50 ns rise / 30 ns fall times with 1 nF load, and integrates bootstrap diode and UVLO on both VCC and VBOOT rails. It is used in induction heating inverters and SR motor drivers where dV/dt immunity (±50 V/ns) and fault diagnostics are critical.

For engineers reviewing the L6386ADTR datasheet, L6386ADTR pinout, L6386ADTR application, or L6386ADTR equivalent, key selection criteria include bootstrap driver R_DS(on) (125 Ω), CMOS/TTL Schmitt-trigger inputs with hysteresis, integrated DIAG open-drain fault reporting, and SO-14 package thermal resistance (165 °C/W).

Technical Context

The L6386ADTR implements independent high-side (floating) and low-side driver stages using BCD™ "offline" process technology. Its high-side section operates up to 600 V referenced to VOUT, while the low-side stage references PGND. Both outputs switch in phase with their respective inputs (HIN/LIN), and the SD pin enables synchronous shutdown with <150 ns propagation delay.

It embeds a comparator with 0.5 V internal reference (±40 mV offset) on CIN for overcurrent protection, driving the open-drain DIAG pin. The integrated bootstrap driver replaces external fast-recovery diodes via a synchronously gated DMOS + series diode structure, with typical R_DS(on) = 125 Ω and voltage drop calculable as V_drop = (Q_gate/T_charge) × R_DS(on).

Key Specifications

Pinout & Package

The L6386ADTR is housed in a 14-lead SOIC (SO-14) package with ECOPACK® compliance, measuring 8.75 mm × 4.0 mm × 1.75 mm (max height), and featuring 165 °C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2110STRPBF, L6386ADTR reduces bill-of-materials count and improves fault response time via integrated diagnostics; versus UCC27211D, it trades peak current for high-voltage robustness and system-level protection features essential in industrial mains-connected equipment.

Availability

L6386ADTR is available at Aetrix Electronics and suitable for induction heating inverters, switched reluctance motor drives, and industrial AC motor drives requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for L6386ADTR 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, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade components since 1987.

The L6386ADTR belongs to ST's high-voltage gate driver product line, engineered specifically for rugged industrial motor control and resonant power conversion where integrated protection, bootstrap efficiency, and noise immunity are mandatory.

FAQ

What is the maximum allowable dV/dt at the HVG output without false triggering?

The L6386ADTR guarantees ±50 V/ns dV/dt immunity across its full operating temperature range (−45 °C to +125 °C), verified per datasheet test conditions. This specification ensures reliable operation even during fast-switching events in high-noise environments like induction heating or motor drives, without requiring additional snubbers or filtering on the gate node.

Can the DIAG pin drive an optocoupler directly for isolated fault signaling?

Yes - the DIAG pin is an open-drain output rated for 2.5 mA sink current at ≤0.8 V low-level voltage. It can directly interface with standard optocoupler LEDs (e.g., PC817, 1.2 V forward voltage) using a 4.7 kΩ pull-up to 5 V, delivering ~0.8 mA LED current. No level-shifting or buffering is required for basic isolation.

How does the integrated bootstrap driver affect minimum achievable switching frequency?

The integrated bootstrap driver imposes no hard lower limit on switching frequency, but C_BOOT must recharge fully during each LVG on-time. At very low frequencies (<1 kHz), leakage dominates; typical steady-state HVG current is <200 µA, so a 1 µF C_BOOT sustains >5 ms on-time before >1 V droop. Designers should verify T_charge ≥ Q_gate × R_DS(on) / ΔV_BOOT for target duty cycle.

Is the L6386ADTR pin-compatible with earlier L6386A variants?

Yes - the L6386ADTR maintains identical pinout, electrical characteristics, and functional behavior as the L6386A and L6386AD versions. The "TR" suffix denotes tape-and-reel packaging (per Table 8), with no changes to silicon or functionality. Existing PCB layouts and firmware require no modification for drop-in replacement.