STMicroelectronics L99DZ80EPTR

Overview

L99DZ80EPTR from STMicroelectronics is an AEC-Q100 qualified automotive door actuator driver IC with six integrated output stages: one 6 A full-bridge (R_ON = 150 mΩ), two 3 A half-bridges (R_ON = 300 mΩ), two 0.5 A half-bridges (R_ON = 1600 mΩ), one 5 A high-side driver (R_ON = 100 mΩ), and four additional configurable high-side drivers supporting electrochromic mirror control and resistive loads. It serves as the central motor and load driver in automotive door modules, enabling dual lock, mirror fold/axis, and defroster actuation.

For engineers reviewing the L99DZ80EPTR datasheet, L99DZ80EPTR pinout, L99DZ80EPTR application, or L99DZ80EPTR equivalent, this device offers SPI-controlled PWM operation, real-time current monitoring across all high-side outputs, open-load and overcurrent diagnostics, programmable soft-start for inrush management, and integrated temperature warning-critical for functional safety-compliant door ECU designs.

Technical Context

The L99DZ80EPTR integrates a centralized two-stage charge pump to sustain full R_ON performance down to VS = 6 V, enabling robust motor drive under cold-crank conditions. Its ST-SPI 3.1 interface supports bidirectional register access for configuration, status readback, and fault reporting-including global and per-output diagnostic flags.

All 11 power outputs (OUT1–OUT11, ECV, ECFD) feature independent overcurrent protection, open-load detection, and programmable PWM control. The electrochromic control block supports both grounded and negatively discharged mirror glass configurations via dedicated ECFD and ECV terminals, with external MOSFET gate drive capability for H-bridge implementation.

Key Specifications

Pinout & Package

TQFP-64 (10 × 10 mm, 0.5 mm pitch) thermally enhanced package with exposed pad for improved heat dissipation in automotive door ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD37101GUL and VNQ7E160AJTR, the L99DZ80EPTR delivers higher functional integration (6 bridges + 5 high-sides + EC control), comprehensive diagnostics via SPI, and cold-crank robustness - reducing system-level component count by ≥12 devices and enabling ASIL-B door ECU architectures.

Availability

L99DZ80EPTR is available at Aetrix Electronics and suitable for automotive door module development, electrochromic mirror systems, and body control unit (BCU) designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.

Supply support for L99DZ80EPTR 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 specializing in automotive, industrial, and power management ICs, with broad portfolio coverage from microcontrollers to intelligent power devices.

The L99DZ80EPTR belongs to ST's automotive smart-power family, designed specifically for next-generation door ECUs requiring integrated motor control, advanced diagnostics, and electrochromic support in compact, thermally efficient packages.

FAQ

What is the maximum junction temperature and thermal shutdown behavior?

The L99DZ80EPTR operates from −40 °C to +150 °C junction temperature. Thermal warning triggers at +145 °C (reported via SPI Status Register 2), and hard thermal shutdown activates at +165 °C, disabling all outputs until junction cools below +140 °C. This two-stage protection preserves system integrity during transient overloads without requiring external thermal sensors.

Does the L99DZ80EPTR support daisy-chained SPI communication?

Yes - the L99DZ80EPTR supports daisy-chained SPI using its 3-state DO pin. When CSN is deasserted, DO enters high-impedance state, allowing multiple devices to share a single SPI bus with sequential register access. This reduces MCU GPIO count and simplifies wiring in multi-door ECU architectures.

How does open-load detection work on high-side outputs like OUT11?

Open-load detection on OUT11 uses internal current-sense circuitry that compares expected vs. actual load current during active drive. If current falls below threshold (e.g., due to broken wire), the fault is latched and reported in Status Register 1. Detection works in both active and standby modes, with configurable sensitivity via SPI Configuration Register bits OLTH1–OLTH3.

Can the electrochromic mirror be driven without external MOSFETs?

No - the ECFD and ECV terminals are gate-drive outputs intended for external N-channel and P-channel MOSFETs forming the H-bridge. The L99DZ80EPTR provides logic-level control, slew-rate adjustment, and fault feedback but does not integrate power FETs for electrochromic current (typically >100 mA). External FET selection must meet mirror voltage/current specs and thermal constraints.