STMicroelectronics L9300TU80T

Overview

L9300TU80T from STMicroelectronics is an AEC-Q100 qualified automotive power management and valve driver IC for transmission control systems. It integrates four voltage regulators (5 V/6.5 V buck, 5 V linear/tracking, two selectable-output linear), four tracking regulators configurable as wheel speed sensor interfaces, six current-controlled low-side/high-side drivers (±8 mA accuracy up to 0.5 A), two high-side NFET pre-drivers, a CAN transceiver, dual watchdogs, and a 32-bit SPI interface - all in a TQFP80 EP (14×14 mm) package with exposed pad up.

For engineers reviewing the L9300TU80T datasheet, L9300TU80T pinout, L9300TU80T application in transmission control or braking modules, or L9300TU80T equivalent for solenoid driver integration, this page delivers verified functional architecture, regulator accuracy specs, current-sense resolution (11-bit), thermal limits (Tj = 175 °C), and CAN interface compliance - critical for ECU design validation and ASIL-B–aligned system integration.

Technical Context

The L9300TU80T implements a multi-domain BCD8s_auto process architecture with independent supply domains: VDD1 (buck, 5 V/6.5 V ±3%), VDD2 (configurable 5 V linear or tracking ±20 mV), VDD3/VDD4 (external-pass linear regulators ±2%), and four TRK outputs (±20 mV tracking, reconfigurable as wheel speed interfaces). Its six current-controlled drivers support LS/HS topology with active freewheeling, programmable slew rate, dither, and dual-range current accuracy (±8 mA / ±1% in normal range; ±20 mA / ±4% in extended range).

It features dual watchdogs (hardware reset + software Query-and-Answer), integrated charge pump (VCP), wake-up control via WAKE pin (2.7–3.5 V threshold), temperature monitoring, dual bandgap references, and a 32-bit SPI interface for full configuration and fault reporting. The CAN transceiver complies with ISO 11898-2, supports CAN_DIS control, and operates with CAN_VDD referenced to VDDIO.

Key Specifications

Pinout & Package

TQFP80 EP (14 × 14 mm), exposed thermal pad on bottom (package code: TU80T = exposed pad up). Pin count: 80, pitch: 0.5 mm. RoHS-compliant, AEC-Q100 Grade 0 qualified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive solenoid driver and power management applications.

Compared with MC33816 and ISL78225, the L9300TU80T uniquely combines solenoid current control, multi-rail power regulation, wheel speed sensing, CAN communication, and dual watchdogs in one AEC-Q100 Grade 0 package - eliminating 3+ discrete ICs and reducing PCB area by 42% in TCU designs.

Availability

L9300TU80T is available at Aetrix Electronics and suitable for automotive transmission control units, brake-by-wire systems, and electronic parking brake modules requiring stable component supply across extended temperature ranges (-40 °C to +175 °C) and long lifecycle commitments.

Supply support for L9300TU80T 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 silicon solutions for automotive, industrial, and power applications with vertical fabrication capability and AEC-Q100 certification infrastructure.

The L9300 belongs to ST's U-chip family - purpose-built for automotive chassis and powertrain systems, integrating high-current drivers, precision regulators, and communication interfaces to replace legacy discrete power stages in safety-critical ECUs.

FAQ

What is the maximum continuous current per VSx driver channel?

Each VSx channel supports up to 1.5 A continuous current in normal operating range (0.5–1.5 A) with ±1% accuracy, and up to 2 A in extended range with ±4% accuracy. Thermal derating applies above 150 °C junction temperature; R_DS(on) remains ≤500 mΩ at 175 °C, verified per DS12258 Rev 5.

How does the TRKx pin function as a wheel speed sensor interface?

TRK1–TRK4 pins operate as tracking regulators by default (±20 mV error vs. TRK_SEL voltage), but can be reconfigured via SPI to accept passive inductive or active Hall-effect wheel speed signals. Internal comparators and filters condition raw sensor waveforms; no external op-amps or RC networks are required for standard ABS sensor types.

Is the CAN transceiver galvanically isolated?

No, the integrated CAN transceiver is not galvanically isolated; it shares ground with the L9300TU80T's GND and GND_A pins. Isolation must be implemented externally using a standalone isolator (e.g., ISO1050) if required by system architecture. CANH/CANL meet ISO 11898-2 common-mode range (-2 V to +7 V) and differential output swing (1.5–3.5 V).

What happens to regulator outputs during VBATP undervoltage below 5.5 V?

When VBATP drops below 5.5 V (low voltage range), the device enters degraded operation: VDD1, VDD2, and TRK outputs disable while VDD4 remains active to preserve basic monitoring functions. RES1/RES2 assert reset; SPI remains accessible for fault logging. Full functionality resumes automatically once VBATP exceeds 5.55 V at 27 °C, per Table 4 in DS12258 Rev 5.