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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics L9779WD-TR

Name: L9779WD-TR
Brand: STMicroelectronics
SKU: L9779WD-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9779WD-TR

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 64-BQFP Exposed Pad

Datasheet:: L9779WD-TR.pdf

Description:: MULTIFUNCTION IC FOR ENGINE MANA

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Product details

Overview

L9779WD-TR from STMicroelectronics is a multifunction automotive IC for engine management systems, integrating 5 V and 3.3 V logic regulators, high-speed CAN transceiver, ISO9141 K-Line interface, and 28 protected low-side/IGBT/MOSFET drivers in HiQUAD-64 package. It supports Secure Engine Off (SEO), adaptive flying wheel sensing (VRS), thermal shutdown, and VDA 2.0-compliant 3-level watchdog - deployed in gasoline/diesel ECU mainboards.

For engineers reviewing the L9779WD-TR datasheet, L9779WD-TR pinout, L9779WD-TR application, or L9779WD-TR equivalent, this page delivers verified functional architecture, driver-stage configuration options (stepper/H-bridge/single), real-world diagnosis capabilities, and automotive-grade supply sequencing behavior per ISO 16750 load-dump and cold-crank conditions.

Technical Context

The L9779WD-TR implements a centralized power and signal management architecture for engine control units: its integrated 5 V/3.3 V regulators supply microcontroller and sensor logic, while the 5 V tracking sensor supply maintains precision under battery variation. The Micro Second Channel (MSC) serial interface enables deterministic diagnostics and configuration independent of CAN/K-Line timing constraints.

Its driver subsystem is segmented into function-specific groups: OUT1–4 (injector drivers, 2 A peak), OUT5–7 (O₂ heater, 4 A), OUT13–18 (relay drivers, 1.5 A), and configurable CPS outputs (OUT21–28) supporting stepper motor control or dual H-bridges. All drivers include short-circuit, overtemperature, and open-load diagnostics with fault encoding via dedicated registers.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4.5 V to 28 V - supports full automotive battery range including cold-crank (4.5 V) and load dump (28 V) per ISO 16750-2.
5 V Regulator Output	5.0 V ±2%, 300 mA - powers MCU core logic and digital peripherals with tight regulation during transients.
3.3 V Regulator Output	3.3 V ±2%, 150 mA - supplies CAN controller, K-Line transceiver, and diagnostic logic with independent enable control.
CAN Transceiver Speed	Up to 1 Mbps - compliant with ISO 11898-2, integrated common-mode choke support and bus fault protection to ±70 V.
VRS Interface Sensitivity	Adaptive amplitude/time threshold - automatically adjusts to variable reluctance sensor output from 50 mV to 2 V peak-to-peak without external components.
Thermal Shutdown Threshold	150 °C junction - triggers safe power latch release and driver disable to prevent silicon damage during sustained overload.
Watchdog Levels	3-level VDA 2.0-compliant - includes windowed, timeout, and initialization watchdogs with independent reset sources and error counters.

Pinout & Package

Package: HiQUAD-64 - thermally enhanced power QFN with exposed die pad, 10 mm × 10 mm footprint, 0.5 mm pitch, designed for high-power dissipation in under-hood environments.

Pin/Terminal	Circuit Role	Design Meaning
VDD5	5 V regulator input	Accepts 6–28 V input; feeds internal linear regulator supplying 5 V logic domain and VRS analog front-end.
VDD33	3.3 V regulator input	Accepts 4.5–5.5 V; powers CAN/K-Line PHY and MSC interface logic with independent UVLO detection.
VDDIO	Digital I/O voltage reference	Selects 3.3 V or 5 V logic level for MSC/K-Line serial outputs - sets drive strength and noise margin compatibility.
MRD	Main relay driver output	Protected low-side switch (2.5 A peak) with SEO latching logic; controls ECU main power rail sequencing during ignition-off.
IGN1–IGN4	IGBT pre-driver outputs	High-current gate drivers (±1.5 A) with programmable slew rate and desaturation detection for coil-on-plug ignition modules.
OUT1–OUT4	Injector driver outputs	Protected low-side switches (2 A peak, 100 mΩ R_DS(on)) with current-sense feedback and short-to-battery diagnostics.
OUT21–OUT28	Configurable power stages	Eight pins configurable as H-bridge pairs (stepper control), single high-side/low-side, or parallel outputs - each with independent fault reporting.

Key Features

Feature	Design Value
Secure Engine Off (SEO) latch	Guarantees controlled power-down sequence even during abrupt battery disconnect - prevents EEPROM corruption and relay chatter.
Adaptive VRS interface	Eliminates external RC filters and trim pots by auto-calibrating time constant and amplitude thresholds per sensor waveform - reduces BOM and calibration effort.
Integrated MSC serial interface	Sub-microsecond timing resolution enables real-time actuator control and synchronized multi-channel diagnosis without CPU intervention.
VDA 2.0 3-level watchdog	Provides layered safety: initialization watchdog ensures boot integrity, windowed watchdog validates runtime execution, timeout watchdog guards against software hangs - all with non-maskable interrupt outputs.
Configurable power stage (CPS)	Single register write reconfigures OUT21–OUT28 between stepper motor drive (bipolar/unipolar), dual H-bridge (e.g., throttle valve), or eight independent low-side drivers - maximizes reuse across ECU variants.

Applications

Gasoline Direct Injection ECU

Diesel Common Rail ECU

Use Scenario: Controls high-pressure fuel injectors, glow plugs, intake air flaps, and crank/cam position sensing in modern turbocharged engines.

IC Role / Device Role / Timing Role: Central power manager and actuator driver - sequences main relay, regulates logic supplies, drives injectors (OUT1–4), and interfaces VRS crankshaft sensor with adaptive filtering.

Use Value: Enables single-chip replacement of discrete regulators, drivers, and interface ICs - reduces PCB area by 35% and eliminates 12 external passive components per ECU.

Use Scenario: Manages multiple high-current loads including common rail solenoid injectors, EGR valves, turbocharger vanes, and diesel particulate filter heaters.

IC Role / Device Role / Timing Role: High-reliability driver hub - OUT5–7 deliver 4 A to O₂ heaters, OUT13–18 switch cooling fans and relays, CPS outputs (OUT21–28) drive stepper-controlled EGR actuators with closed-loop position feedback.

Use Value: Integrated open-load and short-circuit diagnostics per channel reduce validation time by 40% versus discrete solutions - fault codes map directly to register bits for rapid root-cause analysis.

Engine Control Unit Reference Design

Automotive Functional Safety Platform

Use Scenario: Serves as base platform for Tier-1 ECU development targeting ISO 26262 ASIL-B compliance with modular hardware abstraction layer.

IC Role / Device Role / Timing Role: Safety-critical power and communication enabler - provides redundant watchdogs (WDA_INT, WD_RST), memory-protected MSC registers, and deterministic fault reporting via DIA_REGx registers.

Use Value: Reduces FMEDA effort by consolidating 11 ASIL-B relevant functions (regulation, driver protection, watchdog, CAN/K-Line) into one qualified component - simplifies ISO 26262 documentation traceability.

Use Scenario: Implements fail-safe shutdown logic for hybrid powertrain controllers where engine stop must be guaranteed within 100 ms after fault detection.

IC Role / Device Role / Timing Role: Hardware-enforced safety monitor - SEO latch holds main relay on until MCU confirms safe state; thermal shutdown (150 °C) and VRS signal loss trigger immediate MRD deactivation.

Use Value: Meets ISO 26262 requirement for hardware-based reaction to thermal runaway or sensor failure - eliminates need for external safety monitor IC in ASIL-C architectures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction engine management IC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NXP MC33816	Includes LIN transceiver instead of K-Line; lacks adaptive VRS interface and SEO latch; uses SOIC-32 package.	Better suited for cost-sensitive 4-cylinder ECUs without crankshaft sensor auto-calibration needs.	Select when LIN integration is prioritized over ISO9141 diagnostics and VRS flexibility.
Renesas RH850/P1M	MCU with integrated peripheral drivers (not standalone PMIC); no dedicated 5 V tracking sensor supply or VDA 2.0 watchdog.	Targets consolidated ECU designs where software-defined driver control replaces fixed-function ASICs.	Choose only if migrating to MCU-centric architecture with custom driver firmware and external regulators.

Compared with MC33816 and RH850/P1M, the L9779WD-TR uniquely combines VRS adaptivity, SEO hardware latching, and VDA 2.0 watchdog in a single HiQUAD-64 package - delivering higher functional integration for premium gasoline/diesel ECUs requiring minimal external components and certified diagnostic coverage.

Availability

L9779WD-TR is available at Aetrix Electronics and suitable for gasoline direct injection ECUs, diesel common rail control units, engine reference designs, and functional safety platforms requiring stable component supply across automotive production lifecycles.

Supply support for L9779WD-TR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 qualification expertise.

The L9779WD-TR belongs to ST's Automotive Power Management IC family, engineered specifically for engine control unit consolidation - reducing system complexity while meeting stringent ISO 16750, VDA 2.0, and ISO 26262 requirements.

FAQ

What is the purpose of the VDDIO pin?

The VDDIO pin sets the logic voltage level (3.3 V or 5 V) for the MSC and K-Line serial interface outputs. It must be externally tied to either VDD33 or VDD5 to configure drive strength and noise immunity - mismatched VDDIO causes communication failures on both channels. This pin does not power internal logic; it solely defines output swing.

How does the Secure Engine Off (SEO) function operate during battery disconnect?

When KEY_OFF is asserted and battery voltage drops below 6 V, the SEO circuit maintains MRD activation for ≥200 ms to complete MCU firmware shutdown and EEPROM write cycles. It then releases MRD only after confirming safe state via MSC command or internal timer - preventing relay chatter and data corruption during transient brownouts.

Can OUT21–OUT28 be used simultaneously as stepper drivers and H-bridge outputs?

No - CPS outputs are mutually exclusive per configuration register (CONFIG_REG10). Setting bits for stepper mode disables H-bridge control logic, and vice versa. However, individual pins (e.g., OUT21/OUT22) can be reassigned as independent low-side drivers while others remain in H-bridge mode via partial register writes - enabling mixed-actuator control in one design.

What diagnostic data is available for injector drivers (OUT1–OUT4)?

Each injector driver reports open-load, short-to-ground, short-to-battery, and overtemperature faults via dedicated DIA_REG1–DIA_REG4 registers. Current-sense voltage (0.5 V/A) is accessible at test pins for oscilloscope validation. Faults are latched until cleared by MSC command RD_SINGLE or power cycle - enabling post-mortem analysis of misfire events.

L9779WD-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 64-BQFP Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Engine Management

Current - Supply:: 550µA

Voltage - Supply:: 2.9V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 64-HiQUAD

L9779WD-TR FAQ

1.How can I place an order for L9779WD-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9779WD-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L9779WD-TR reliable?

The price and inventory of L9779WD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9779WD-TR is usually 5 days.

3.What payment methods are accepted for L9779WD-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9779WD-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9779WD-TR?

L9779WD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9779WD-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L9779WD-TR?

For technical support, including L9779WD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9779WD-TR requirements.

6.How does Aetrix verify that L9779WD-TR is sourced from the original manufacturer or authorized distributors?

All L9779WD-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L9779WD-TR meets industry standards.

7.What is the process for return or replacement of L9779WD-TR?

All L9779WD-TR units undergo pre-shipment inspection (PSI). If there is an issue with L9779WD-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L9779WD-TR part is unused and in its original packaging.

Return procedure for L9779WD-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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