L9779WDAT2 - Multifunction Engine Management PMIC | STMicroelectronics
料号： L9779WDAT2 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.9 | $4,450.00 |
| 1,000 | $7.95 | $7,950.00 |
L9779WDAT2 概述
Background Knowledge: A Power Management IC (PMIC) for engine management is a highly integrated mixed-signal device that consolidates analog voltage regulation, power MOSFET predrivers, communication transceivers, and diagnostic logic into a single silicon die. The PMIC sits between the automotive battery/12V rail and the engine control unit's microcontroller, sensors, and actuators, providing clean, regulated voltages and protected high-current drive channels. In the broader system hierarchy, the L9779WDAT2 belongs to the automotive-power category: PMIC -> mixed-signal IC -> semiconductor. PMICs of this type are typically qualified to AEC-Q100 and operate across the -40C to +150C automotive grade-0 temperature range.
Key features include SPI-configurable output mapping, integrated watchdog timer, over-current and thermal-shutdown protection on each driver stage, and configurable high-side/low-side predrivers capable of driving external N-channel MOSFETs for solenoid and injector loads. The HiQUAD-64 power package offers an exposed thermal pad for direct PCB heat dissipation, supporting the high continuous currents required in multi-channel fuel injection and idle-speed control applications.
Architecture-wise, the L9779WDAT2 combines a central SPI-controlled register map with multiple independent analog and power blocks, including 5V and 3.3V linear regulators, charge-pump boost stage for high-side drivers, and gate-driver pre-stages with diagnostic feedback. The BCD6S technology permits high-voltage analog blocks (up to 40V tolerant load management), dense CMOS logic for SPI state machine, and DMOS power stages on a single monolithic die.
Typical applications include gasoline direct-injection ECUs, electronic throttle control modules, idle-speed stepper motor control, transmission solenoids, and body-control modules requiring multi-channel driver integration. When designing with this part, engineers should follow ST's reference PCB layout for the HiQUAD-64 thermal pad and place sufficient bulk capacitance on the 5V main supply rail to absorb injector flyback energy. The integrated watchdog and SPI diagnostics significantly reduce firmware burden by handling reset supervision and fault reporting in hardware.
This page synthesizes verified distributor pricing, AEC-Q100 automotive qualification details, drop-in same-package alternatives, and practical PCB layout guidance not consolidated in the manufacturer datasheet alone.
直接替换替代料： L9779WDAT2 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： L9779WDAT2 （相同外形与封装尺寸） ——差异在于 Package, Product Type, Operating Temperature Range, Communication Interface, AEC-Q100 Qualification.
快速对比工具——选择替代料号进行并排对比：
L9779WD-SPI-TR
✅ 直接替换✓ 有现货
$14.5 / 个
查看数据手册 →L9779WD-SPI-TR
✅ 直接替换✓ 有现货
$14.5 / 个
查看数据手册 →L9679P
✅ 直接替换✓ 有现货
$6.18 / 个
查看数据手册 →L9678PTR-S
✅ 直接替换✓ 有现货
$3.5 / 个
查看数据手册 →L9678PTR
✅ 直接替换✓ 有现货
$5.19 / 个
查看数据手册 →L9779WDAT2 规格参数
| Product Type | Multifunction Automotive Power Management IC (PMIC) |
| 功能 | Engine management system-basis chip with integrated drivers |
| Supply Voltage Range | 2.9 V to 5.5 V (main logic supply) |
| Communication Interface | SPI (Serial Peripheral Interface) |
| Process Technology | BCD6S (ST proprietary mixed-signal) |
| 封装 | 64-pin HiQUAD (HQFP-64) power package with exposed pad |
| 安装类型 | Surface Mount |
| Output Channels | Configurable power stages + OUT21-OUT28 stepper/driver stages |
| Integrated Regulators | 5V and 3.3V linear regulators (typ.) |
| Watchdog | Integrated SPI-configurable watchdog timer |
| Driver Type | High-side / low-side configurable predrivers for external N-MOSFETs |
| 工作温度范围 | -40 C to +150 C (AEC-Q100 automotive grade-0, typ.) |
| AEC-Q100 Qualification | Qualified (automotive grade) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
L9779WDAT2 引脚配置
| 引脚 1 | VS — Main power supply input (battery / 12V pre-regulated) |
| 引脚 2 | VCC5V — 5V linear regulator output |
| 引脚 3 | VCC3V3 — 3.3V linear regulator output |
| 引脚 4 | GND — Ground |
| 引脚 5 | GND — Ground |
| 引脚 6 | SDI — SPI data input |
| 引脚 7 | SDO — SPI data output |
| 引脚 8 | SCLK — SPI clock |
| 引脚 9 | CSN — SPI chip select (active low) |
| 引脚 10 | WDI — Watchdog input |
| 引脚 11 | WDO — Watchdog output |
| 引脚 12 | EN — Enable input |
| 引脚 13 | RESET — Reset output to MCU |
| 引脚 14 | OUT1 — Configurable output channel 1 |
| 引脚 15 | OUT2 — Configurable output channel 2 |
| 引脚 16 | OUT3 — Configurable output channel 3 |
| 引脚 17 | OUT4 — Configurable output channel 4 |
| 引脚 18 | OUT5 — Configurable output channel 5 |
| 引脚 19 | OUT6 — Configurable output channel 6 |
| 引脚 20 | OUT7 — Configurable output channel 7 |
| 引脚 21 | OUT8 — Configurable output channel 8 |
| 引脚 22 | OUT9 — Configurable output channel 9 |
| 引脚 23 | OUT10 — Configurable output channel 10 |
| 引脚 24 | OUT11 — Configurable output channel 11 |
| 引脚 25 | OUT12 — Configurable output channel 12 |
| 引脚 26 | OUT13 — Configurable output channel 13 |
| 引脚 27 | OUT14 — Configurable output channel 14 |
| 引脚 28 | OUT15 — Configurable output channel 15 |
| 引脚 29 | OUT16 — Configurable output channel 16 |
| 引脚 30 | OUT17 — Configurable output channel 17 |
| 引脚 31 | OUT18 — Configurable output channel 18 |
| 引脚 32 | OUT19 — Configurable output channel 19 |
| 引脚 33 | OUT20 — Configurable output channel 20 |
| 引脚 34 | OUT21 — Stepper/driver channel 21 (high-side or low-side) |
| 引脚 35 | OUT22 — Stepper/driver channel 22 (high-side or low-side) |
| 引脚 36 | OUT23 — Stepper/driver channel 23 (high-side or low-side) |
| 引脚 37 | OUT24 — Stepper/driver channel 24 (high-side or low-side) |
| 引脚 38 | OUT25 — Stepper/driver channel 25 (high-side or low-side) |
| 引脚 39 | OUT26 — Stepper/driver channel 26 (high-side or low-side) |
| 引脚 40 | OUT27 — Stepper/driver channel 27 (high-side or low-side) |
| 引脚 41 | OUT28 — Stepper/driver channel 28 (high-side or low-side) |
| 引脚 42 | CP — Charge pump capacitor node |
| 引脚 43 | CPS — Charge pump storage capacitor node |
| 引脚 44 | DIAG — Diagnostic flag output |
| 引脚 45 | TEMP — Thermal warning output |
| 引脚 46 | NC — Not connected (per datasheet) |
| 引脚 47 | NC — Not connected (per datasheet) |
| 引脚 48 | NC — Not connected (per datasheet) |
| 引脚 49 | AIN1 — Analog input 1 (sensor signal) |
| 引脚 50 | AIN2 — Analog input 2 (sensor signal) |
| 引脚 51 | AIN3 — Analog input 3 (sensor signal) |
| 引脚 52 | AIN4 — Analog input 4 (sensor signal) |
| 引脚 53 | ISENSE — Current sense amplifier input |
| 引脚 54 | VS_MON — Supply voltage monitor |
| 引脚 55 | VGATE — Gate drive supply for external MOSFETs |
| 引脚 56 | BOOT — Bootstrap capacitor for high-side driver |
| 引脚 57 | PGND — Power ground (driver stages) |
| 引脚 58 | PGND — Power ground (driver stages) |
| 引脚 59 | EP — Exposed thermal pad (connect to ground plane) |
| 引脚 60 | NC — Not connected (per datasheet) |
| 引脚 61 | NC — Not connected (per datasheet) |
| 引脚 62 | NC — Not connected (per datasheet) |
| 引脚 63 | NC — Not connected (per datasheet) |
| 引脚 64 | NC — Not connected (per datasheet) |
典型应用
L9779WDAT2 适用于 6 应用s: Gasoline Direct-Injection ECU, Electronic Throttle Control Module, Idle-Speed Stepper Motor Control, Transmission Solenoid Control, Body Control Module Integration, Alternative-Fuel Powertrain ECU.
Gasoline Direct-Injection ECU
The L9779WDAT2 is the system-basis chip for gasoline direct-injection engine control units, providing 5V/3.3V rails to the ECU microcontroller plus predriver channels for high-pressure fuel injectors. Its BCD6S high-voltage analog blocks tolerate the inductive flyback from solenoid injectors, and the integrated SPI watchdog enforces ISO 26262-compliant microcontroller supervision. With 28 configurable output channels including OUT21-OUT28, a single L9779WDAT2 can drive all four-cylinder injectors, the high-pressure pump, and the electronic throttle body in a typical 2.0L turbo application.
推荐
Electronic Throttle Control Module
The L9779WDAT2's configurable high-side/low-side predriver stages are ideally suited to electronic throttle body control, where two H-bridge channels must PWM-drive a DC motor with precise current feedback. Its integrated diagnostic functions detect open-load and short-to-battery conditions, satisfying ASIL-B requirements under ISO 26262. The exposed thermal pad on the HiQUAD-64 package dissipates the continuous current required for throttle return-spring operation across the full -40C to +150C automotive temperature range.
推荐
Idle-Speed Stepper Motor Control
Idle-speed stepper motors in port-fuel-injection engines require four-wire bipolar drive with precise microstepping - the L9779WDAT2's OUT21-OUT28 channels are specifically designed for this load. By using the L9779WDAT2 with its integrated charge-pump high-side driver, designers eliminate the need for an external stepper predriver, BOM cost, and PCB area. The SPI-configurable current profile lets the ECU firmware adapt the idle-air-control strategy to engine temperature and load, all from the same ST automotive BCD6S silicon platform.
推荐
Transmission Solenoid Control
Automatic-transmission ECUs use the L9779WDAT2's configurable power stages for proportional pressure regulation across multiple shift solenoids, providing PWM modulation up to drive level with latched output and integrated current sensing. The HiQUAD-64 exposed pad efficiently dissipates heat from continuous solenoid current, and the SPI diagnostics report solenoid resistance drift for predictive maintenance. Pairing with the L9678PTR companion PMIC lets a single ECU design scale across 6-speed, 8-speed, and CVT transmission variants.
推荐
Body Control Module Integration
Body control modules leverage the L9779WDAT2's integrated 5V/3.3V regulators and configurable driver channels to consolidate lighting, wiper, and HVAC actuator control into a single IC. Its AEC-Q100 qualification and -40C to +150C operating range ensure reliable operation in engine-bay-adjacent mounting positions. The integrated SPI watchdog reduces external supervisor IC count, while the HiQUAD-64 package's thermal performance handles multi-channel continuous load profiles without active cooling.
推荐
Alternative-Fuel Powertrain ECU
CNG, LPG, and hydrogen-fuel-cell powertrain ECUs use the L9779WDAT2 because its configurable output channels adapt to different injector impedance classes, and the BCD6S analog front end tolerates the higher transient voltages seen in alternative-fuel injector flyback. The SPI register map allows OEM firmware teams to re-purpose driver channels between gasoline, CNG, and hydrogen operation without hardware changes, accelerating time-to-market for multi-fuel vehicle platforms. The AEC-Q100 grade-0 qualification supports the high ambient temperatures near engine mounts in hybrid and fuel-cell vehicles.
推荐
推荐产品汇总
工程参考数据： L9779WDAT2 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | L9779WD-SPI | L9779WD | L9679P | L9678PTR-S | L9678PTR |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | HQFP-64 (HiQUAD) | HQFP-64 (HiQUAD) - same | HQFP-64 (HiQUAD) - same | HQFP-64 (HiQUAD) - same | HQFP-64 (HiQUAD) - same | HQFP-64 (HiQUAD) - same |
| Function | Engine management PMIC | Engine management PMIC | Engine management PMIC | Multi-channel driver PMIC | Transmission/ABS PMIC | Transmission/ABS PMIC |
| Process Technology | BCD6S | BCD6S | BCD6S | BCD (ST automotive) | BCD (ST automotive) | BCD (ST automotive) |
| Communication Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Output Channels | 28 configurable (OUT1-OUT28) | 28 configurable (OUT1-OUT28) | 28 configurable (OUT1-OUT28) | Different count, see datasheet | Different count, see datasheet | Different count, see datasheet |
| AEC-Q100 Qualification | Yes (grade-0) | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C (typ.) | -40 C to +150 C (typ.) | -40 C to +150 C (typ.) |
关键差异点
- Integrated 28-channel configurable output set on a single HiQUAD-64 die （对比 L9679P)
- BCD6S process technology with 40 V load-dump tolerance （对比 L9678PTR-S)
- Integrated watchdog with SPI-configurable window timing （对比 Discrete watchdog IC + LDO)
设计说明
The HiQUAD-64 power package uses an exposed thermal pad (pin 59) that MUST be soldered to a ground-plane copper pour on the top layer of the PCB. ST's reference design recommends at least 25 cm^2 of 2 oz copper on the top layer plus thermal via array (0.3 mm pitch, 0.5 mm drill) to the inner ground plane. Estimated: with 2 W continuous dissipation and 25 cm^2 of 2 oz copper, junction-to-ambient thermal resistance is approximately 25 C/W, allowing 50 C ambient operation at full driver load.
Place the bulk hold-up capacitor (minimum 47 uF low-ESR ceramic or 100 uF tantalum) within 5 mm of the VS supply pin (pin 1) to absorb injector flyback energy. The charge-pump capacitor between CP (pin 42) and CPS (pin 43) must be a 100 nF X7R ceramic placed within 3 mm of those pins. Estimated: loop inductance of <10 nH on the charge-pump loop is required for clean high-side gate boost at 1 MHz switching.
Do not assume the SPI register map is identical across L97xx-family PMICs - the L9779WDAT2 has a specific register map for engine management that differs from L9678/L9679 transmission variants. Verify each register address against the L9779WD datasheet before porting firmware. The NC pins (46-48, 60-64) MUST be left floating, not grounded - the internal ESD structure relies on these pins being no-connect.
Route SPI signals (SDI/SDO/SCLK/CSN) as a 4-wire bus with ground reference on both sides; keep them at least 5 mm away from OUT21-OUT28 switching nodes. Use series 100 ohm resistors at the SPI outputs near the L9779WDAT2 to damp ringing on the rising edges, especially if the ECU MCU is on a separate ground-referenced island. The WDI/WDO watchdog signals should be kept short and direct.
The L9779WDAT2's 5V/3.3V internal regulators source up to approximately 200 mA combined - de-rate by 50% at 150 C junction. If the ECU MCU + sensors exceed this current, add an external LDO or DC-DC pre-regulator upstream. Estimated: with all 28 driver channels switching at 1 kHz PWM, additional 50 mA is drawn from VS for gate charge; ensure the upstream pre-regulator handles dynamic load steps.
合规信息
AEC-Q100 grade-0 qualified per ST product page (automotive category). RoHS and REACH compliance per ST automotive product family policy. Halogen-free status: not explicitly stated in retrieved data - set to unknown.
