STMicroelectronics L99DZ120TR

Overview

L99DZ120TR from STMicroelectronics is an AEC-Q100 qualified automotive door actuator driver IC with integrated LIN 2.2a transceiver, featuring 4 half-bridge outputs (7.5 A/150 mΩ to 3 A/300 mΩ), 8 configurable high-side drivers (0.15–1.5 A), dual 5 V regulators, programmable soft-start, and comprehensive protection including current monitoring, open-load detection, thermal warning/shutdown, and fail-safe low-side cluster. It targets power window, mirror, and lock control in vehicle door modules.

For engineers reviewing the L99DZ120TR datasheet, L99DZ120TR pinout, L99DZ120TR application, or L99DZ120TR equivalent, this device supports LIN-based distributed door zone control with embedded PWM timing, H-bridge supervision, VS duty-cycle adjustment for LED drivers, and SPI-configurable diagnostics - critical for functional safety-compliant automotive body electronics design.

Technical Context

The L99DZ120TR integrates a LIN 2.2a transceiver compliant with SAE J2602, enabling bidirectional communication over single-wire bus while supporting wake-up from standby modes via LIN or dedicated WU input. Its internal 10-bit PWM timer drives each standalone high-side output independently, allowing precise current-controlled actuation of solenoids and small motors.

It implements a dual-voltage-regulator architecture (V1/V2, both 5 V/200 mA) for MCU and peripheral supply, coupled with programmable reset generation, window watchdog, and fail-safe block with two isolated 1 Ω low-side switches to forcibly disable external HS MOSFET gates during fault conditions. Thermal clusters monitor junction temperature and trigger warning at 150 °C and shutdown at 175 °C.

Key Specifications

Pinout & Package

LQFP-64 ePad package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad for enhanced heat dissipation in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive door zone driver applications.

Compared with TPIC2040PWP and MC33883A, the L99DZ120TR provides full door-zone integration - combining LIN, multiple H-bridge/high-side outputs, regulators, diagnostics, and fail-safe logic in one AEC-Q100 package - reducing BOM count and PCB area while meeting ASIL-B readiness requirements.

Availability

L99DZ120TR is available at Aetrix Electronics and suitable for automotive door module production, body control unit (BCU) development, and LIN-based distributed actuator systems requiring stable component supply across extended temperature ranges (−40 °C to 150 °C).

Supply support for L99DZ120TR 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 automotive, industrial, and power management ICs with strong AEC-Q100 validation infrastructure.

The L99DZ120TR belongs to ST's L99 family of automotive system basis chips (SBCs), designed specifically for intelligent door zone control with integrated power, communication, and safety functions - targeting ASIL-B compliance in body electronics.

FAQ

What LIN protocol versions does the L99DZ120TR support?

The L99DZ120TR implements a fully compliant LIN 2.2a transceiver, certified to SAE J2602 Class B. It supports all mandatory LIN frame types (unsolicited, event-triggered, sporadic), checksum formats (classic and enhanced), and slave node response timing. It does not support LIN 2.3 or LIN 2.4 extensions such as configurable baud rate or secure boot.

How does the fail-safe low-side cluster operate during thermal shutdown?

Upon thermal shutdown (Tj ≥ 175 °C), the isolated fail-safe block activates two 1 Ω low-side switches (LS1/LS2) to forcibly pull down the gates of external high-side MOSFETs, ensuring immediate motor de-energization regardless of SPI or LIN state. This hardware-level action remains active until VS drops below UVLO threshold or device resets.

Can the L99DZ120TR drive a 12 V, 5 A DC motor directly?

Yes - its four half-bridge outputs (OUT1, OUT4, OUT5, OUT6) each support 7.5 A continuous current with RON ≤ 150 mΩ, enabling direct driving of 12 V DC motors up to 5 A. Internal current monitoring, soft-start, and thermal supervision ensure safe operation without external current-sense resistors or discrete protection circuitry.

What is the purpose of the VS compensation module?

The VS compensation module digitally adjusts the PWM duty cycle applied to LED driver outputs (e.g., OUT9–OUT12) based on real-time VS measurement, maintaining constant LED brightness across battery voltages from 11 V to 16 V. It uses internal ADC readings and programmable lookup tables, eliminating need for external voltage-sensing feedback loops.