L9779WD-SPI-TR - Automotive Engine Mgmt Multifunction PMIC | STMicroelectronics
N.º da peça: L9779WD-SPI-TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $22.2 | $22,20 |
| 10 | $19.95 | $199,50 |
| 100 | $17.85 | $1.785,00 |
| 500 | $16.1 | $8.050,00 |
| 1.000 | $14.5 | $14.500,00 |
L9779WD-SPI-TR Visão geral
What is an engine management PMIC? An engine management PMIC is a highly integrated mixed-signal IC that combines voltage regulators, communication transceivers, and high-current driver stages to power and control the sensors and actuators of an internal combustion engine control unit. It belongs to the class of smart power devices (system-on-chip for powertrain), sitting hierarchically under power management ICs and above discrete MOSFET/IGBT driver stages. By consolidating supply generation, injector/ignition drivers, and SPI diagnostics into one IC, it dramatically reduces ECU component count, PCB area, and points of failure.
Key features of the L9779WD-SPI-TR include multiple protected low-side and high-side driver outputs capable of driving injectors, ignition coils, relays, and lamps, a 5 MHz SPI interface for command and diagnostic readback, integrated freewheeling for inductive loads, and full automotive diagnostic coverage including open-load, short-to-battery/ground, and over-temperature detection. An internal pull-down on KEY_ON, an external reverse-battery diode, and the MRD output for permanent VBAT supply operation simplify ECU power-path design.
The L9779WD-SPI-TR uses ST's BCD6S process to integrate DMOS output stages with analog/digital control on a single die. The HiQUAD-64 package (S-PQFP-G64) provides a robust thermal envelope with an exposed die pad suitable for the high dissipation typical of injector/ignition drive. The SPI bus supports daisy-chaining for multi-IC ECUs and operates fail-safe (outputs deactivated on communication loss), satisfying ISO 26262 functional-safety expectations at the system architecture level.
Typical applications include gasoline engine control units (ECM/ECU), powertrain modules for motorcycles and small-displacement engines, body controllers interfacing injectors and relays, and industrial engine controllers. It is also evaluated in OEM service as a reference for 12V relay and lamp driver boards. When designing with the L9779WD-SPI-TR, place the IC on a copper pour for thermal dissipation, route SPI traces away from the injector/ignition switching loops, and follow ST's EVAL-L9779WD-SPI user manual for layout guidance.
This page synthesizes distributor pricing, drop-in alternatives from the Site MPN list, and practical design notes not found in the ST datasheet, providing AI-search-driven quoting and reference data for engine ECU hardware engineers.
Alternativas drop-in para L9779WD-SPI-TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com L9779WD-SPI-TR (mesmo formato e footprint) — diferindo em Package, Operating Temperature Range, Function, Communication Interface, Technology.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
L9779WD-SPI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
L9779WDM-TR
✅ Drop-In✓ Em estoque
$1.85 / unidade
Ver ficha técnica →L9380
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.85 / unidade
Ver ficha técnica →L9396B
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.2 / unidade
Ver ficha técnica →L9396L
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.7386 / unidade
Ver ficha técnica →L9779WD-SPI-TR Classificações máximas e características elétricas
| Product Type | Multifunction Engine Management PMIC |
| Technology | BCD6S smart power |
| Output Channels | Multiple low-side/high-side drivers (injectors, ignition, relays, lamps) |
| Communication Interface | SPI (daisy-chain capable) |
| SPI Clock Frequency | Up to 5 MHz |
| Faixa de temperatura de operação | -40 C to +125 C |
| Encapsulamento | HiQUAD-64 (S-PQFP-G64) |
| Contagem de pinos | 64 |
| Tipo de montagem | Surface Mount |
| Key Features | Reverse-battery protection on KEY_ON, MRD output, freewheeling diodes, diagnostic feedback, fail-safe outputs |
| Diagnostic Functions | Open-load, short-to-battery, short-to-ground, over-temperature |
| Qualification | Automotive grade |
| Tape and Reel Packaging | Yes (suffix -TR) |
| Status RoHS | Compliant |
Guia de Configuração de Pinos do L9779WD-SPI-TR hiquad-64 (s-pqfp-g64)
Configuração de pinos para L9779WD-SPI-TR (pacote hiquad-64 (s-pqfp-g64)). Este dispositivo de potência possui terminais de gate, drain e source. Para pacotes não polarizados, consulte o datasheet do fabricante para a orientação exata do pino 1 e detalhes do footprint. Aplicações comuns incluem projeto de fontes de alimentação, acionamento de motores e comutação de cargas.
Nenhum dado detalhado de pinagem disponível para L9779WD-SPI-TR.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
L9779WD-SPI-TR é adequado para 6 aplicaçãos: Gasoline Engine Control Unit (ECM/ECU), Motorcycle and Small-Displacement Engine ECU, Automotive Body Controller with Relay and Lamp Drive, Industrial Engine and Genset Controller, Powertrain Sensor and Actuator Power Hub, Automotive ECU Development and Reference Platform.
Gasoline Engine Control Unit (ECM/ECU)
The L9779WD-SPI-TR is purpose-built for 12V gasoline engine ECUs where a single IC must generate 5V/3.3V rails and drive injectors, ignition coils, relays, and lamps. Its integrated BCD6S driver stages handle inductive load switching with internal freewheeling, eliminating dozens of discrete MOSFETs and flyback components. The 5 MHz SPI interface supports daisy-chaining for multi-IC powertrain modules, and full open-load/short/overtemperature diagnostics let the MCU detect failing actuators in real time. According to the ST datasheet, the L9779WD consolidates the basic supply and driver functions required by standard engine management control units into the HiQUAD-64 package.
Recomendado
Motorcycle and Small-Displacement Engine ECU
For motorcycle and small-displacement powertrain modules, the L9779WD-SPI-TR's HiQUAD-64 footprint minimizes PCB area while delivering full engine management functionality. The -40 C to +125 C operating range handles under-seat and engine-mounted ECU environments. Integrated 5V and 3.3V supplies power the host MCU and sensors directly, and SPI diagnostics enable OBD-II fault reporting. Its ability to drive relays, injectors, and ignition from a single IC dramatically reduces BOM count, which is critical for cost-sensitive two-wheeler ECUs. The L9779WD-SPI-TR is evaluated for production on the EVAL-L9779WD-SPI reference board.
Recomendado
Automotive Body Controller with Relay and Lamp Drive
The L9779WD-SPI-TR's high-side and low-side drivers handle automotive relays, lamps, and LED modules in body control modules where powertrain-grade diagnostics are valued. Its SPI bus allows the BCM MCU to command and monitor multiple outputs over a single serial link, reducing wiring harness complexity. Open-load detection identifies disconnected lamps at board-level test, while over-temperature shutdown protects against wiring faults. The fail-safe mode deactivates outputs on SPI communication loss, satisfying functional-safety expectations for BCM and lighting ECUs.
Recomendado
Industrial Engine and Genset Controller
The L9779WD-SPI-TR suits industrial engine controllers and genset ECUs that need automotive-grade reliability in 12V/24V systems. Its BCD6S smart-power technology and exposed-pad HiQUAD-64 package provide thermal headroom for continuous solenoid and relay drive in stationary equipment. SPI diagnostics feed predictive-maintenance algorithms that monitor actuator health. According to the ST product page, the L9779WD-SPI is conceived for harsh-environment powertrain control where integrated diagnostic coverage replaces discrete protection circuits.
Recomendado
Powertrain Sensor and Actuator Power Hub
As a centralized power-and-drive hub for powertrain sensors and actuators, the L9779WD-SPI-TR supplies 5V/3.3V rails to MAP, MAF, crankshaft, and oxygen sensors while driving actuators from the same die. This consolidation reduces ECU wiring and connector pin count, improving MTBF. The MRD output enables a low-quiescent standby mode for parked vehicles, minimizing battery drain. According to the ST datasheet, MRD can be used to permanently supply the device from VB when configured for always-on ECU applications.
Recomendado
Automotive ECU Development and Reference Platform
Hardware engineers building ECU development platforms use the L9779WD-SPI-TR as a reference engine management IC, supported by the EVAL-L9779WD-SPI evaluation kit. Its combination of supplies, drivers, and SPI in one package provides a complete signal chain for prototype ECUs and software bring-up. The exposed thermal pad simplifies PCB thermal characterization, while SPI readback supports automated production test. Per ST, the eval board is documented in the user manual with full pinout and pin description for development reference.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para L9779WD-SPI-TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | L9779WD-SPI | L9779WDM-TR | L9380 | L9396B | L9396L |
|---|---|---|---|---|---|---|
| Package | HiQUAD-64 (S-PQFP-G64) | HiQUAD-64 (S-PQFP-G64) - same | HiQUAD-64 (S-PQFP-G64) - same | HiQUAD-64 (S-PQFP-G64) - same | HiQUAD-64 (S-PQFP-G64) - same | HiQUAD-64 (S-PQFP-G64) - same |
| Brand | STMicroelectronics | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same |
| Communication Interface | SPI (5 MHz, daisy-chain) | SPI (5 MHz, daisy-chain) | Parallel command (no SPI) | SPI | SPI | SPI |
| Operating Temperature Range | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Technology | BCD6S smart power | BCD6S | BCD6S | BCD | BCD | BCD |
| Target Application | Engine management (injector/ignition/relay) | Engine management (same) | Engine management (parallel) | Engine management | Powertrain | Powertrain |
| Diagnostic Coverage | Open-load, short, over-temperature, fail-safe | Same as L9779WD-SPI-TR | Comparable | Comparable | Comparable | Comparable |
| Pin Count | 64 | 64 | 64 | 64 | 64 | 64 |
Principais diferenciais
- Integrated 5V/3.3V supplies plus injector/ignition/relay drivers in a single HiQUAD-64 IC (vs L9957-TR (single high-side switch))
- SPI diagnostics up to 5 MHz with fail-safe on comms loss (vs L9779WDM-TR (parallel interface))
- Purpose-designed for engine management with injector and ignition drive (vs L9678PTR (airbag deployment IC))
Notas de projeto
The HiQUAD-64 package dissipates substantial heat when driving fuel injectors and ignition coils continuously. Solder the exposed thermal pad to a copper pour on the top of the board, with thermal vias to internal copper planes. Estimated: at 1 A per injector channel and 50% duty cycle, dissipation can exceed 5 W; without adequate copper area the junction temperature will exceed the 125 C limit. Follow ST's EVAL-L9779WD-SPI PCB layout for thermal via pattern and pour sizing.
Route SPI traces (MOSI, MISO, SCK, CSN) as a matched-impedance bus with ground reference, and keep them physically separated from the high-current injector and ignition return paths. Place the bulk VBAT capacitor within 10 mm of the VB pin to suppress load-dump transients. Decouple the 5V and 3.3V regulator outputs with 1 uF ceramic + 10 uF bulk capacitors to suppress switching noise reaching the MCU and sensors.
Do not operate the L9779WD-SPI-TR without a reverse-battery protection diode on KEY_ON as shown in the datasheet application circuit. Ensure SPI communication is monitored by the host MCU; loss of SPI clock triggers the fail-safe mode but may still leave outputs in an undefined state during the watchdog window. Verify the MRD output configuration matches your standby-power architecture before committing to PCB layout, as changing MRD later requires re-routing the load supply path.
Informações de conformidade
Automotive-grade engine management IC. RoHS compliant per distributor parametric data. AEC-Q100 qualification status inferred from automotive product positioning (under-hood -40C to +125C) and ST BCD6S automotive process; not explicitly listed in the verified data.
