STMicroelectronics L99DZ80EP

Overview

L99DZ80EP from STMicroelectronics is an AEC-Q100 qualified automotive door actuator driver IC with six integrated half-bridge outputs (including one 6 A full bridge), five high-side drivers (up to 5 A), and dedicated electrochromic mirror control logic. It integrates SPI-based diagnostics, programmable soft-start, open-load/overcurrent detection, and a central two-stage charge pump for motor drive down to 6 V supply. Used in dual-door lock, mirror fold/axis, and defroster control systems.

For engineers reviewing the L99DZ80EP datasheet, L99DZ80EP pinout, L99DZ80EP application, or L99DZ80EP equivalent, this page delivers verified functional architecture, real-world diagnostic capabilities (e.g., current monitor output per high-side driver), thermal protection thresholds (Tj ≤ 150 °C shutdown), and SPI register-mapped control-critical for automotive body control module (BCM) integration and fail-safe system validation.

Technical Context

The L99DZ80EP implements a microcontroller-driven, SPI-configurable multi-output driver architecture with segregated power domains: VS1 powers OUT1–OUT3, OUT7–OUT11, and internal circuitry; VS2 powers OUT4–OUT6. Its central two-stage charge pump enables full R_DS(on) operation of the main H-bridge down to 6 V, while independent slew-rate control on gate drivers mitigates EMI during switching transitions.

All 11 power outputs feature per-channel diagnostics: open-load detection via voltage monitoring, overcurrent protection with configurable recovery mode, and current-sense feedback via analog CM output. The electrochromic control block supports bidirectional discharge (via ECFD pin) and integrates SPI-accessible configuration registers for PWM timing, fault masking, and watchdog window settings.

Key Specifications

Pinout & Package

TQFP-64 package with exposed thermal pad (EPAD) for enhanced thermal dissipation; requires soldering EPAD to PCB ground plane per STMicroelectronics layout guidelines (DocID18260 Rev 6, Section 6.2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD15101GUL and VNQ5E160K-E, the L99DZ80EP uniquely integrates motor bridge control, electrochromic management, and SPI-based system-level diagnostics in a single AEC-Q100 device - reducing inter-IC communication overhead and enabling deterministic fault response in ASIL-B door systems.

Availability

L99DZ80EP is available at Aetrix Electronics and suitable for automotive door control modules, electrochromic mirror subsystems, and body control unit (BCU) designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.

Supply support for L99DZ80EP 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, and automotive-grade analog/mixed-signal devices since 1987.

The L99DZ80EP belongs to ST's Automotive Power Driver family, engineered specifically for intelligent body electronics - delivering integrated motor control, diagnostics, and fail-safe features to accelerate ASIL-B-compliant door and mirror system development.

FAQ

What is the maximum continuous current rating for the full-bridge output (OUT1–OUT3)?

The L99DZ80EP's primary full-bridge (configured using OUT1–OUT3) supports 6 A continuous current with R_ON = 150 mΩ at T_j = 25 °C. Derating applies above 85 °C junction temperature per Figure 6 in DocID18260 Rev 6; thermal design must maintain θ_JA ≤ 30 °C/W on 4-layer PCB to sustain full load.

How does the electrochromic mirror discharge function work?

The ECFD pin provides a dedicated low-impedance path to discharge electrochromic glass negatively - enabling rapid dimming reversal without external components. When activated via SPI register bit ECFD_EN, it sinks current from the mirror's floating electrode through an internal DMOS switch referenced to VS, avoiding voltage overshoot during discharge.

Can the L99DZ80EP drive external power MOSFETs in H-bridge configuration?

Yes - pins GSH1–GSH4 and GSL1–GSL4 provide gate-drive outputs for four external N-channel MOSFETs in H-bridge topology. These drivers support programmable slew-rate control and feature drain-source monitoring (DSMON) for short-circuit detection, as defined in Table 15 and Figure 15 of the datasheet.

Is the SPI interface compatible with standard 3.3 V microcontrollers?

Yes - all SPI pins (CSN, DI, CLK, DO) are 3.3 V tolerant with VIH(min) = 2.0 V and VIL(max) = 0.8 V. The interface uses ST-SPI 3.1 protocol with fixed 8-bit command byte format and supports read/write access to 8 control and 4 status registers without external level-shifting.