L9924 - 24V Alternator Regulator IC | STMicroelectronics
MPN： L9924 ✓ 啟用中L9924 概覽
An alternator regulator is a critical component in vehicle electrical systems that maintains the output voltage of the alternator within a specified range to charge the battery and power the electrical loads. It is part of the power management hierarchy, specifically within automotive power management ICs, which manage the generation, distribution, and regulation of electrical power in vehicles. The L9924 belongs to the category of specialized power ICs and modules, focusing on alternator control.
Key features of the L9924 include AEC-Q100 qualification, a system-in-package design that combines the regulator with an 8-bit microcontroller, and protected high/low side field pre-drivers for external MOS transistors. It also provides field short circuit protection and regulated voltage driven by the ECU (Engine Control Unit). The device supports multiple communication protocols including RCV, PCM, and C_term, enabling flexible control in various vehicle architectures.
Technically, the L9924 uses a nonmonolithic approach, integrating the regulator and microcontroller in a single package but not on a single die, which allows for optimized performance and flexibility. The device operates over a wide temperature range, with absolute maximum ratings specified for junction temperatures from -40°C to 155°C. This ensures reliable operation in harsh automotive environments, including under-hood applications where temperatures can be extreme.
Typical applications for the L9924 include alternator regulation in commercial trucks, agricultural vehicles, and passenger cars. It is particularly suited for 24 V systems, which are common in heavy-duty vehicles, but also supports 12 V systems. The device's ability to communicate via RCV, PCM, and C_term protocols makes it adaptable to different ECU interfaces, enabling seamless integration into existing vehicle electrical architectures.
When designing with the L9924, it is essential to consider the thermal management of the package, as the integrated microcontroller and regulator can dissipate significant power. Proper PCB layout with adequate copper area for heat sinking is recommended. Additionally, the field pre-driver outputs must be protected against short circuits, which the device inherently provides, but external component selection should be validated for the specific application.
直接替換替代品，適用於 L9924 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： L9924 （相同外形與佔位） — 差異在於 Architecture, Communication Protocols.
L9924L
✅ 直接替換📋 參考替代品（不在目錄中）
L9924LTR
✅ 直接替換📋 參考替代品（不在目錄中）
L9924 最大額定值與電氣特性
| Qualification | AEC-Q100 |
| System Voltage | 12 V and 24 V |
| Communication Protocols | RCV, PCM, C_term |
| Field Pre-driver | Protected high/low side for external MOS |
| Field Short Circuit Protection | Yes |
| Regulated Voltage Control | Driven by ECU |
| Architecture | System in package (nonmonolithic) |
| Microcontroller | 8-bit |
| Junction Temperature Range | -40°C to 155°C |
L9924 standard 腳位配置指南
L9924（standard 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： L9924.
請參閱 資料表 以查看完整腳位配置。
典型應用
L9924 適用於 6 應用s: Commercial Truck Alternator Regulation, Agricultural Vehicle Power Management, Passenger Car Alternator Control, 24V Military Vehicle Electrical Systems, Heavy-Duty Construction Equipment, Marine Alternator Regulation.
Commercial Truck Alternator Regulation
The L9924 is designed for 24 V systems in commercial trucks, providing regulated alternator output to charge batteries and power electrical loads. Its AEC-Q100 qualification and robust communication protocols (RCV, PCM, C_term) ensure reliable operation in harsh environments. The integrated 8-bit microcontroller allows precise control of the field current, optimizing charging efficiency and protecting against overvoltage. Field short circuit protection prevents damage to external MOSFETs, enhancing system reliability. Compared to simpler regulators, the L9924 offers advanced diagnostics and communication with the ECU, enabling predictive maintenance and improved fuel efficiency.
推薦
Agricultural Vehicle Power Management
In agricultural vehicles, the L9924 regulates the alternator output to support 12 V and 24 V systems, ensuring stable power for lighting, electronics, and implements. The device's ability to communicate via RCV, PCM, and C_term protocols allows integration with various ECU architectures. The protected high/low side field pre-drivers drive external MOSFETs, reducing power dissipation and improving efficiency. The AEC-Q100 qualification ensures operation in extreme temperatures and vibration. The system-in-package design simplifies PCB layout and reduces component count, saving space and cost. Field short circuit protection enhances safety and reduces downtime.
推薦
Passenger Car Alternator Control
The L9924 supports 12 V systems in passenger cars, providing regulated alternator output for battery charging and electrical loads. Its compact system-in-package integrates an 8-bit microcontroller, enabling advanced control algorithms for improved fuel economy and reduced emissions. The device communicates with the ECU via RCV, PCM, or C_term protocols, allowing adaptive charging strategies. The protected field pre-drivers and short circuit protection ensure reliable operation. The wide junction temperature range (-40°C to 155°C) makes it suitable for under-hood applications. Compared to discrete solutions, the L9924 reduces component count and simplifies design.
推薦
24V Military Vehicle Electrical Systems
The L9924 is suitable for 24 V military vehicles, providing robust alternator regulation in demanding environments. Its AEC-Q100 qualification ensures high reliability, and the integrated microcontroller allows secure communication with the vehicle's ECU. The device supports multiple protocols, enabling integration with military-specific communication standards. The protected field pre-drivers and short circuit protection enhance system survivability. The wide temperature range and rugged package make it ideal for military applications. The system-in-package design reduces size and weight, critical for military platforms.
推薦
Heavy-Duty Construction Equipment
In construction equipment, the L9924 regulates alternator output for 24 V systems, powering hydraulic controls, lighting, and electronics. The device's robust design and AEC-Q100 qualification ensure reliable operation in dusty, vibrating environments. The communication protocols allow integration with the equipment's ECU for load management. The protected field pre-drivers drive external MOSFETs, reducing heat generation. Field short circuit protection prevents damage to the alternator and wiring. The system-in-package design simplifies installation and reduces maintenance.
推薦
Marine Alternator Regulation
The L9924 can be used in marine applications for alternator regulation in 12 V and 24 V systems. Its AEC-Q100 qualification and wide temperature range make it suitable for marine environments with high humidity and temperature variations. The device's communication protocols allow integration with marine engine ECUs. The protected field pre-drivers and short circuit protection enhance reliability. The system-in-package design reduces space requirements, beneficial in compact marine engine compartments. The integrated microcontroller enables advanced charging algorithms for battery maintenance.
推薦
推薦產品摘要
工程參考資料，適用於 L9924 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | L9924L | L9924LTR |
|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| System Voltage | 12 V and 24 V | 12 V and 24 V | 12 V and 24 V |
| Communication Protocols | RCV, PCM, C_term | RCV, PCM, C_term | RCV, PCM, C_term |
| Field Pre-driver | Protected high/low side | Protected high/low side | Protected high/low side |
| Field Short Circuit Protection | Yes | Yes | Yes |
| Microcontroller | 8-bit | 8-bit | 8-bit |
主要差異化特點
- Integrated 8-bit microcontroller (對比L9924L)
- AEC-Q100 qualification (對比L9924L)
- Support for 12 V and 24 V systems (對比L9924L)
設計說明
The L9924 integrates an 8-bit microcontroller and regulator, which can dissipate significant power. Ensure adequate PCB copper area for heat sinking, especially in high-temperature under-hood environments. The junction temperature range is -40°C to 155°C, so thermal management is critical to avoid exceeding the maximum rating. Use thermal vias and a ground plane to improve heat dissipation.
Place decoupling capacitors close to the power supply pins to filter noise. The field pre-driver outputs should have proper gate resistors to limit switching transients. Follow the layout guidelines in the datasheet for the external MOSFETs to minimize parasitic inductance. Ensure the PCB traces for the communication lines (RCV, PCM, C_term) are routed away from high-current paths to avoid interference.
Do not exceed the absolute maximum junction temperature of 155°C. Ensure the field pre-driver outputs are protected against short circuits, which the L9924 provides, but verify external component ratings. When using the L9924L as a replacement, confirm pin compatibility and package type, as the available data does not specify the exact package. Also, verify the supply voltage range and communication protocol compatibility with the ECU.
合規資訊
AEC-Q100 qualification confirmed from datasheet. RoHS and other compliance not specified in available data.