STMicroelectronics L6382D

Overview

L6382D from STMicroelectronics is a high-voltage BCD-based power management unit and gate driver IC for LED drivers with integrated PFC and half-bridge stages. It features four MOSFET drivers (PFC, high-side/low-side half-bridge, auxiliary), 3.3 V ±1% reference output (30 mA max), internal bootstrap diode, and digital overcurrent protection with TTL-compatible CSO latch. It enables microcontroller-controlled dimmable/non-dimmable LED drivers up to 150 W.

For engineers reviewing the L6382D datasheet, L6382D pinout, L6382D application, or L6382D equivalent, this page delivers verified technical context, SO-20 package mapping, startup/operating mode timing behavior, real-world driver current specs (120 mA source/sink for LSG/HSG), and validated alternatives for LED driver PMU replacement.

Technical Context

The L6382D implements a dual-state power management architecture: save mode (VCC regulated between 12.75–14.85 V via HVSU cycling) and operating mode (TPR-regulated VCC with PSW switching synchronized to LGI falling edge). Its internal logic enforces interlocking between HSG and LSG to prevent cross-conduction, and disables all drivers during undervoltage lockout (VCC < 7.5 V) or VREF fault (VREF < 2.0 V).

Startup relies on a 600 V-rated HVSU generator that charges VCC until 14 V (typ.), then shuts off; during operation, TPR uses an internal charge-pump structure-enabled by coupling pin 7 (TPR) to a switching node-to sustain VCC without external components. The 3.3 V reference remains active only when VCC > 5.7 V and supplies up to 30 mA exclusively in operating mode.

Key Specifications

Pinout & Package

Package: SO-20 (Small Outline, 20-pin, 0.65 mm pitch, exposed thermal pad). Pin 1 marked with dot; pin 16 is high-voltage spacer (NC, internal isolation only).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver PMU applications.

Compared with IRS21531DPBF and UCC27712DR, the L6382D uniquely integrates PFC + half-bridge + auxiliary drivers, 3.3 V reference, HVSU, and digital OCP in one SO-20 package-reducing BOM count by ≥12 components and eliminating external bootstrap diodes and startup resistors.

Availability

L6382D is available at Aetrix Electronics and suitable for dimmable LED ballasts, non-dimmable streetlights, and smart LED modules requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.

Supply support for L6382D 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 analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The L6382D belongs to ST's LED Driver Power Management Unit product line, engineered specifically for high-efficiency, microcontroller-managed AC/DC LED drivers with integrated PFC and half-bridge stages - targeting reduced system cost and improved thermal reliability.

FAQ

What is the maximum operating frequency supported by the L6382D drivers?

The L6382D supports digital input signals up to 400 kHz for LSI, HSI, HEI, and PFI pins. Driver outputs (LSG, HSG, PFG) are characterized for operation up to 400 kHz (LSG/HSG) and 600 kHz (PFG), with propagation delays of 300 ns (LGI→LSG) and 200 ns (HGI→HSG) ensuring timing integrity in high-frequency PFC+HB designs.

How does the internal bootstrap diode function, and what external components does it replace?

The L6382D integrates a synchronous bootstrap diode between BOOT and OUT pins with R_DS(on) = 150 Ω and 2.4 V forward drop at 10 mA. It replaces the traditional external fast-recovery diode in half-bridge gate drive circuits, eliminating one component, reducing PCB area, and improving reliability by removing solder joint failure points.

Can the L6382D operate without an external microcontroller?

No - the L6382D is designed as a microcontroller-managed controller: all gate drive signals (PFI, LSI, HSI, HEI) are digital inputs requiring active TTL-level control. It has no internal PWM generator or autonomous regulation logic; the MCU must provide timing, dimming, and fault recovery sequences per the state diagram in Section 6.2.

What happens during overcurrent detection, and how is the fault cleared?

When CSI voltage exceeds 0.56 V (typ.), the internal comparator triggers and latches CSO high while disabling LSG and HSG drivers immediately. Recovery requires either cycling VCC below UVLO (7.5 V) to reset the IC, or simultaneously pulling LGI and HGI low - both actions clear the CSO latch and re-enable drivers after TED = 10 µs delay.