L9779WD-TR - Multifunction Engine Management PMIC | STMicroelectronics
MPN: L9779WD-TR ✓ Hoạt độngL9779WD-TR Tóm tắt
A multifunction PMIC for engine management is a mixed-signal IC that consolidates the analog and power stages required to run a gasoline or diesel Engine Control Unit (ECU). In modern ECUs it sits between the 12 V or 24 V battery rail and the microcontroller, providing regulated sensor rails, driving low-side and high-side injector stages, controlling lamp/relay pre-drivers, and supervising battery/ignition lines. This category falls within the broader PMIC family and the wider automotive power-management domain, and is typically paired with an MCU such as the SPC56 or SPC58 series in safety-relevant powertrain systems.
Key features include five 5 V sensor supplies with current limiting, four low-side injector drivers (typically 4 x 1.5 A), four low-side lamp/relay pre-drivers, an ignition KEY_ON input with internal pull-down, an MSC diagnostic interface, and integrated watchdog/reset functionality. The device is qualified to automotive temperature grades and uses BCD6S mixed-signal process technology, giving it tolerance to load-dump transients common on 12 V vehicle buses.
The L9779WD integrates an internal charge pump to drive N-channel FETs, an SPI/MSC configuration block, and a thermal-shutdown block, all sharing a single die. This high level of integration reduces ECU board area versus discrete driver implementations and helps shorten wire-harness routing because the high-current outputs are multiplexed from a single IC.
Typical applications include gasoline and diesel engine ECUs, motorcycle ECUs, powersport vehicle controllers, and small-displacement powertrain modules. The wide operating voltage range and integrated diagnostics make it a common choice where a robust, AEC-Q100-grade power front-end is needed.
When designing with the L9779WD-TR, pay particular attention to thermal layout of the HiQUAD-64 power package: the exposed pad must be soldered to a sufficiently large copper area to keep junction temperature within AEC-Q100 Grade-1 limits at worst-case injector current.
This page synthesizes distributor pricing, MSC vs SPI variant differences, and practical design notes not consolidated in any single manufacturer document.
Bộ thay thế dễ dàng lắp đặt cho L9779WD-TR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với L9779WD-TR (cùng hình factor và footprint) — khác nhau ở Package, Communication Interface, Operating Temperature Range.
L9779WD-SPI-TR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →L9779WD-SPI-TR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →L9779WD-SPI-TR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →L9779WD-TR Tỷ lệ tối đa & tính chất điện
| Chức năng | Multifunction IC for engine management |
| Cấu trúc | Engine Management PMIC with MSC interface |
| Process Technology | BCD6S |
| Supply Voltage (VBAT) | Up to 18 V typ., load-dump tolerant |
| Number of 5 V Sensor Supplies | 5 (current-limited) |
| Injector Low-Side Drivers | 4 x low-side drivers |
| Lamp/Relay Pre-Drivers | 4 x low-side pre-drivers |
| Communication Interface | MSC (L9779WD/-TR); SPI (L9779WD-SPI/-SPI-TR) |
| Watchdog | Yes (integrated) |
| KEY_ON Input | Yes (internal pull-down, external reverse-battery diode) |
| Charge Pump | Yes (internal, for N-channel FET drive) |
| Tắt nhiệt | Yes |
| Hộp | HiQUAD-64 (power package, exposed pad) |
| Nhiệt độ hoạt động | -40C to +125C (automotive AEC-Q100 grade) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Packaging | Tape & Reel (TR suffix) |
Cấu hình chân L9779WD-TR
| Chân 1 | VB — Battery supply input |
| Chân 2 | VCC5V_1 — 5 V sensor supply output 1 |
| Chân 3 | VCC5V_2 — 5 V sensor supply output 2 |
| Chân 4 | GND — Power ground |
| Chân 5 | KEY_ON — Ignition/wake-up input with internal pull-down |
| Chân 6 | MSC — MSC serial diagnostic interface line |
| Chân 7 | WD_OUT — Watchdog output to host MCU |
| Chân 8 | RESET — Reset output to host MCU |
| Chân 9 | INJ1 — Injector 1 low-side driver |
| Chân 10 | INJ2 — Injector 2 low-side driver |
| Chân 11 | INJ3 — Injector 3 low-side driver |
| Chân 12 | INJ4 — Injector 4 low-side driver |
| Chân 13 | PRE1 — Pre-driver 1 output (lamp/relay) |
| Chân 14 | PRE2 — Pre-driver 2 output (lamp/relay) |
| Chân 15 | PRE3 — Pre-driver 3 output (lamp/relay) |
| Chân 16 | PRE4 — Pre-driver 4 output (lamp/relay) |
| Chân 17 | MRD — Main Relay Driver output |
| Chân 18 | CP — Charge-pump node for N-FET drive |
| Chân 19 | TEMP — Analog temperature sensor output |
| Chân 20 | DIAG — Diagnostic flag output |
| Chân 21-63 | I/O / NC — Various digital I/O, sensor, and supply pins per datasheet pin table |
| Chân 64 | EPAD — Exposed thermal pad (must be soldered to copper) |
Ứng dụng tiêu biểu
L9779WD-TR phù hợp cho 6 Áp dụngs: Gasoline Engine ECU Power Stage, Diesel Engine Management ECU, Motorcycle / Powersport ECU, Small-Displacement LPG / CNG ECU, Outboard Marine Engine ECU, Standalone Engine Controller (Industrial / Genset).
Gasoline Engine ECU Power Stage
The L9779WD-TR is the front-end power IC for 4-cylinder gasoline ECUs, providing 5 V sensor rails and 4 low-side injector drivers from a 12 V battery. With 4 integrated injector low-sides and 4 pre-drivers, it can sink the full current budget of a 4-cylinder engine in a single HiQUAD-64 chip, eliminating the need for discrete MOSFET driver stages. The MSC interface lets the host SPC56-class MCU query fault registers and toggle outputs, while the integrated watchdog guarantees MCU sanity.
Được đề xuất
Diesel Engine Management ECU
In diesel ECUs the L9779WD-TR drives the injectors and provides conditioned sensor supplies for rail-pressure and pedal-position sensors. Its load-dump-tolerant front-end is rated for 12 V and 24 V commercial-vehicle buses, and the BCD6S process gives the ruggedness needed for solenoid driver PWM operation. The integrated 5 V sensor rails feed the rail-pressure and crank-position sensors that close the diesel injection control loop.
Được đề xuất
Motorcycle / Powersport ECU
Single- and twin-cylinder motorcycle ECUs use the L9779WD-TR to combine injection, sensor supply, and lamp driving on a compact board. The HiQUAD-64 footprint is small enough to fit inside a sealed ECU enclosure, and the integrated 4 injector channels cover the full injection complement of most powersport engines. Key_on wake-up behavior matches the ignition-switched supply common in two-wheeler wiring harnesses.
Được đề xuất
Small-Displacement LPG / CNG ECU
Alternative-fuel ECUs for LPG and CNG conversions use the L9779WD-TR to drive gas-injector low-sides and the host of 5 V sensors required for closed-loop lambda control. The 4-injector channel count typically matches the 4-cylinder LPG arrangement, and the integrated current-limited sensor rails simplify the lambda and MAP-sensor biasing. Its automotive temperature grade supports under-hood mounting near the gas rail.
Được đề xuất
Outboard Marine Engine ECU
Marine outboard ECUs operate in a harsher thermal and humidity environment and benefit from the L9779WD-TR's -40C to +125C operating grade and sealed HiQUAD-64 power package. The integrated sensor supplies drive crank-position and temperature sensors while the lamp/relay pre-drivers control warning indicators and fuel-pump relays. The exposed thermal pad is soldered to the chassis for direct heat-sinking into the engine block.
Được đề xuất
Standalone Engine Controller (Industrial / Genset)
Standalone industrial engine controllers for gensets and pumps adopt the L9779WD-TR as the front-end driver, taking advantage of its 5 V sensor rails and integrated pre-drivers to drive starter relays and shutdown solenoids. The KEY_ON input maps cleanly onto a keyswitch signal, and the MSC diagnostic bus allows the supervisor PLC to read fault flags. Industrial vibration profiles are well within the HiQUAD-64 mechanical rating.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho L9779WD-TR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | L9779WD | L9779WD-SPI-TR | L9779WD-SPI |
|---|---|---|---|---|
| Package | HiQUAD-64 | HiQUAD-64 (same) | HiQUAD-64 (same) | HiQUAD-64 (same) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Serial Interface | MSC | MSC | SPI | SPI |
| Packaging | Tape & Reel (TR) | Tube / Tray | Tape & Reel | Tube / Tray |
| Injector Low-Side Drivers | 4 | 4 | 4 | 4 |
| Lamp/Relay Pre-Drivers | 4 | 4 | 4 | 4 |
| 5 V Sensor Supplies | 5 | 5 | 5 | 5 |
| Process Technology | BCD6S | BCD6S | BCD6S | BCD6S |
Bảo phân biệt quan trọng
- MSC vs SPI variant on identical silicon (vsL9779WD-SPI-TR)
- Tape-and-reel packaging for high-volume assembly (vsL9779WD)
- Integrated 5 V sensor supplies reduce BOM (vsL9779WD-SPI)
Ghi chú thiết kế
The HiQUAD-64 exposed thermal pad is the primary heat-dissipation path for the L9779WD-TR. At full load with 4 injectors pulling peak current, internal dissipation can exceed several watts. Solder the EPAD to a copper pour of at least 1 square inch on top and bottom layers, stitched with thermal vias, to keep junction temperature below the +150C shutdown threshold across the -40C to +125C operating range.
Place the bulk VBAT decoupling capacitor (>=47 uF) within 5 mm of the VB pin and use a wide PCB trace rated for the worst-case injector current (typically 4 x 1.5 A peak). Keep the KEY_ON input trace short and route the MSC line away from the injector switching nodes to avoid coupling noise into the diagnostic bus. The exposed pad must be a solid copper region with no signal traces crossing it.
Do not operate the L9779WD-TR without an external reverse-battery protection diode on KEY_ON, otherwise the internal pull-down structure can be damaged during a jump-start event. Also ensure the MSC pull-up resistor matches the host MCU's logic level (typically 5 V); a wrong pull-up value causes intermittent communication loss in production. Verify watchdog timing in firmware against the datasheet's tWD specification before locking the design.
Thông tin tuân thủ
Automotive-grade part per STMicroelectronics product family. Confirm latest PPAP and IMDS filings with ST FAE before design-in for series production.
