Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics L9779WD

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

Compare

Part No.:: L9779WD

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 64-BQFP Exposed Pad

Datasheet:: L9779WD.pdf

Description:: MULTIFUNCTION IC FOR ENGINE MANA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,026

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

L9779WD 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 protected low-side drivers (OUT1–OUT28) with configurable power stages. It features adaptive flying wheel (VRS) sensing, Secure Engine Off (SEO) latch, thermal shutdown, and VDA 2.0-compliant 3-level watchdog - deployed in BCD6S technology for under-hood ECU applications.

For engineers reviewing the L9779WD datasheet, L9779WD pinout, L9779WD application, or L9779WD equivalent, this device serves as a system basis chip (SBC) for gasoline/diesel engine control units requiring integrated power regulation, sensor interface, driver protection, serial diagnostics, and functional safety compliance per ISO 26262 ASIL-B capable architecture.

Technical Context

The L9779WD implements a multi-domain power management architecture: dual linear regulators (5 V/300 mA, 3.3 V/200 mA) feed logic domains; a dedicated 5 V tracking sensor supply supports variable reluctance sensors; and eight protected low-side switch groups (LSa–LSd) provide current-limited, short-circuit-protected drive for injectors, O₂ heaters, relays, and low-current peripherals. The VRS interface includes adaptive amplitude/time filtering and self-calibrating peak detection.

It integrates two independent serial interfaces - high-speed CAN (ISO 11898-2 compliant, 1 Mbps) and K-Line (ISO 9141-2) - both isolated via dedicated VDDIO pin (1.8 V to 5 V selectable). Its Micro Second Channel (MSC) enables deterministic command/response timing, while the 3-level watchdog (WDA) supports initialization, normal operation, and error recovery states with configurable timeout and fault encoding.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Regulators	5 V / 300 mA and 3.3 V / 200 mA linear regulators - power microcontroller core and peripheral logic without external LDOs
Sensor Supply	5 V tracking output (±1% accuracy, 100 mA) - dynamically follows battery voltage to maintain stable VRS signal conditioning
CAN Transceiver	High-speed CAN compliant to ISO 11898-2, 1 Mbps data rate, bus fault protection up to ±70 V - enables robust vehicle network communication
VRS Interface	Flying wheel input with adaptive time/amplitude control - auto-configures threshold and hysteresis for crank/cam position sensing across temperature and air gap variation
Protected Outputs	28 total protected low-side channels: OUT1–4 (injector drivers, 2 A peak), OUT5–7 (O₂ heater, 4 A), OUT13–18 (relays, 2.5 A), OUT19–20 (low-current, 0.5 A)
Configurable Stages	8 CPS outputs (OUT21–28) configurable as H-bridge, half-bridge, or parallel single-stage - supports stepper motor actuation or high-current solenoid control
Watchdog	VDA 2.0-compliant 3-level watchdog with INIT/NORMAL/ERROR states, programmable timeouts, and AB1 reset assertion - meets ASIL-B diagnostic coverage requirements

Pinout & Package

Package: HiQUAD-64 - thermally enhanced power package with exposed die pad, designed for high-power dissipation in automotive under-hood environments (R_thJA = 28 °C/W typical).

Pin/Terminal	Circuit Role	Design Meaning
VDD	Main supply input	Connects to battery (4.5–28 V); powers internal regulators and high-current drivers
VDDIO	Digital I/O voltage reference	Selects logic level (1.8 V to 5 V) for MSC/K-Line/CAN digital pins - enables mixed-voltage system interfacing
VRS_IN	Flying wheel sensor input	Differential input with adaptive gain and offset cancellation - accepts ±50 mV to ±1 V AC signals from VR sensors
CANH / CANL	CAN bus differential pair	Integrated transceiver outputs with dominant/recessive state control and bus fault protection
KL_IN / KL_OUT	K-Line bidirectional line	Single-wire ISO 9141-2 interface supporting diagnostic read/write at 10.4 kbps
OUT1–OUT28	Protected low-side outputs	28 individually monitored, current-limited, short-circuit-protected switches - grouped by current rating and diagnostic capability
IGN1–IGN4	IGBT pre-driver outputs	High-side gate drivers with programmable slew rate and desaturation detection - for ignition coil primary control
MRD	Main relay driver	Protected high-current (5 A) low-side switch with SEO latching - ensures safe ECU power-down sequence

Key Features

Feature	Design Value
Secure Engine Off (SEO) latch	Guarantees controlled main relay deactivation during key-off, preventing uncommanded restart or residual current drain
Adaptive VRS interface	Real-time adjustment of detection thresholds and filter time constants - eliminates manual calibration for crankshaft position sensing
Configurable Power Stages (CPS)	8 outputs (OUT21–28) reconfigurable via registers as H-bridge, half-bridge, or paralleled single-stage - supports flexible actuator control without hardware change
VDA 2.0 3-level watchdog	Three distinct operational states (INIT/NORMAL/ERROR) with independent timeout settings and fault-encoded reset behavior - satisfies automotive functional safety monitoring
Thermal warning & shutdown	Two-stage thermal protection: warning interrupt at 150 °C, automatic shutdown at 175 °C - prevents damage during sustained overload or ambient extremes

Applications

Gasoline Engine Control Unit

Diesel Common Rail ECU

Use Scenario: Central control unit managing fuel injection, ignition timing, throttle actuation, and exhaust gas recirculation in passenger car gasoline engines.

IC Role / Device Role / Timing Role: System basis chip providing regulated power, sensor signal conditioning (VRS), injector/ignition driver outputs, and diagnostic communication (CAN/K-Line).

Use Value: Integrates 28 protected drivers and dual regulators into one HiQUAD-64 package - reduces board space, BOM count, and validation effort versus discrete SBC + driver solutions.

Use Scenario: High-pressure diesel injection controller requiring precise solenoid valve timing, rail pressure monitoring, and on-board diagnostics.

IC Role / Device Role / Timing Role: Powers MCU and peripherals, conditions cam/crank VRS signals, drives common rail solenoids via CPS outputs, and enables UDS over CAN.

Use Value: CPS configuration allows OUT21–28 to drive high-current solenoids in half-bridge mode with built-in short-circuit protection - eliminates need for external gate drivers and sense resistors.

Transmission Control Module

Electric Power Steering (EPS) Support ECU

Use Scenario: Automatic transmission control unit managing torque converter clutch, shift solenoids, and hydraulic pressure valves.

IC Role / Device Role / Timing Role: Supplies regulated 5 V/3.3 V rails, drives shift solenoids (OUT1–4, OUT5–7), monitors gear position sensors via VRS, and communicates via CAN.

Use Value: LSa/LSb group diagnosis enables real-time open-load and short-to-battery detection on solenoid outputs - improves transmission fault detection latency and diagnostic coverage.

Use Scenario: Auxiliary ECU supporting EPS by controlling cooling fan, assist motor enable, and sensor redundancy paths.

IC Role / Device Role / Timing Role: Provides isolated 3.3 V logic supply, drives fan relay (OUT13–18), monitors steering angle sensor supply, and reports faults via K-Line.

Use Value: Dedicated VDDIO pin allows K-Line interface to operate at 3.3 V while MCU runs at 5 V - simplifies level-shifting and improves EMC robustness in noisy EPS environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction automotive SBC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NXP MC33816	Includes integrated LIN transceiver and SPI interface; lacks VRS interface and CPS configurability; lower current ratings on low-side outputs (1.5 A max)	Better suited for body control modules with LIN networks; not optimized for crank/cam sensing or stepper motor actuation	Select when LIN integration is required and VRS/CPS functionality is unnecessary
Renesas RAA271002	Features ARM Cortex-M0+ co-processor for firmware-based diagnostics; higher CAN FD support (5 Mbps); no dedicated 5 V tracking sensor supply	Targeted at next-gen ASIL-D ECUs needing embedded processing; requires external VRS signal conditioning circuitry	Select for advanced diagnostic autonomy and CAN FD migration path, accepting added design complexity

Compared with MC33816 and RAA271002, the L9779WD uniquely combines adaptive VRS sensing, configurable H-bridge power stages, and VDA 2.0 watchdog in a single HiQUAD-64 package - making it optimal for cost-sensitive, ASIL-B-compliant engine management where sensor interface integration and driver flexibility are critical.

Availability

L9779WD is available at Aetrix Electronics and suitable for gasoline engine control units, diesel common rail ECUs, transmission control modules, and electric power steering support ECUs requiring stable component supply across extended automotive lifecycles.

Supply support for L9779WD 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 technologies with broad analog, MCU, and smart power portfolios.

The L9779WD belongs to ST's Automotive Power and Sensing portfolio, designed specifically for engine and transmission control units requiring integrated power management, sensor interface, and protected driver functionality in harsh automotive environments.

FAQ

What is the maximum continuous current rating for OUT1–OUT4 injector drivers?

OUT1–OUT4 (LSa group) support 2 A continuous current per channel with thermal foldback and short-circuit protection. Peak current capability is 4 A for ≤100 µs pulses. These outputs include integrated current sensing and open-load detection, enabling real-time injector health monitoring without external components.

Does the L9779WD support CAN FD or only classical CAN?

The L9779WD integrates a high-speed classical CAN transceiver compliant with ISO 11898-2, supporting data rates up to 1 Mbps. It does not support CAN FD physical layer signaling or protocol extensions. For CAN FD applications, an external transceiver or alternative SBC such as the RAA271002 is required.

How is the VRS interface calibrated for different air gaps and temperature drift?

The VRS interface performs automatic adaptive calibration during engine cranking: it measures signal amplitude and zero-crossing timing, then adjusts internal comparator thresholds and filter coefficients in real time. This eliminates factory calibration and maintains accurate crank/cam position detection across -40 °C to +150 °C and air gaps from 0.4 mm to 2.5 mm.

Can the CPS outputs (OUT21–OUT28) be used independently as single high-side switches?

No - the CPS outputs are low-side only and cannot function as high-side switches. They can be configured as low-side single-stage, high-side/low-side pairs (H-bridge), or paralleled low-side stages. External high-side drivers or complementary external MOSFETs are required for true high-side control.

L9779WD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 64-BQFP Exposed Pad

Packaging:: Tray

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 FAQ

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

Please submit a Request for Quotation (RFQ) for L9779WD 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 reliable?

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

3.What payment methods are accepted for L9779WD?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9779WD?

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

Once your L9779WD 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?

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

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

All L9779WD 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 meets industry standards.

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

All L9779WD units undergo pre-shipment inspection (PSI). If there is an issue with L9779WD, 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 part is unused and in its original packaging.

Return procedure for L9779WD:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…