SPSA068 - Automotive PMIC with Buck and Precise Voltage Reference | STMicroelectronics
料号： SPSA068 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.49 | $4.49 |
| 10 | $4.1 | $41.00 |
| 100 | $3.7 | $370.00 |
| 500 | $3.3 | $1,650.00 |
| 1,000 | $2.9 | $2,900.00 |
SPSA068 概述
A PMIC (Power Management Integrated Circuit) is a class of integrated circuits that manage power requirements of a host system, typically including voltage regulators, references, and supervisory functions. In the hierarchy of power management, a PMIC sits above individual regulators, integrating multiple power functions into a single device to reduce board space and improve reliability. The SPSA068 specifically combines a buck converter (a step-down switching regulator) with a precise voltage reference, a window watchdog, a reset output, and an SPI interface, making it a complete power solution for automotive MCUs.
Key features of the SPSA068 include AEC-Q100 qualification, a pre-SMPS buck regulator adjustable via NVM to 5.0 V, 3.3 V, or 1.2 V at load currents of 0.5 A and 1.0 A, with switching frequencies of 0.4/2.4 MHz. It also provides a 1% accurate reference voltage, a window watchdog, a reset output, and an SPI bus for configuration. The low-power mode (LPM) reduces quiescent current to 50 μA typical under light-load conditions, making it suitable for always-on automotive systems.
Technically, the SPSA068 uses a synchronous current-mode buck architecture with integrated power MOSFETs, which improves efficiency and reduces external component count. The internal programmable memory (NVM) allows selection of output voltages and switching frequencies, providing design flexibility. The precise voltage reference is based on a bandgap architecture, ensuring stable operation over temperature and supply variations. The device also includes protection features such as thermal shutdown and overcurrent protection, enhancing system reliability.
Typical applications include automotive body control modules, engine control units (ECUs), and infotainment systems, where a reliable and efficient power supply for MCUs is critical. The SPSA068 is also used in functional safety applications, as it supports the requirements of ISO 26262 with its window watchdog and reset output. Its low quiescent current makes it ideal for battery-powered automotive systems that require minimal power draw when the vehicle is off.
When designing with the SPSA068, it is important to properly configure the NVM settings for the desired output voltage and switching frequency. The SPI interface allows dynamic configuration, but the default settings should be verified against the application requirements. Additionally, adequate input and output capacitance is required for stable operation of the buck converter, and the PCB layout should minimize parasitic inductance in the power path.
直接替换替代料： SPSA068 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SPSA068-TR
✅ 直接替换📋 参考替代料（不在目录中）
SPSA068 最大额定值与电气特性
| 输出类型 | Buck (Step-Down) + Voltage Reference |
| Buck Output Voltage Options | 5.0 V, 3.3 V, 1.2 V (adjustable via NVM) |
| Buck Output Current | 0.5 A and 1.0 A |
| 开关频率 | 0.4/2.4 MHz |
| Reference Voltage Accuracy | 1% |
| Quiescent Current (LPM) | 50 μA typ |
| Integrated Power MOSFETs | Yes (HS and LS) |
| Control Interface | SPI |
| Watchdog | Window watchdog |
| Reset Output | Yes |
| 封装 | 32-QFN (5x5 mm) / VFQFN32L |
| 安装类型 | Surface Mount |
| Qualification | AEC-Q100 |
SPSA068 引脚配置
| 引脚 1 | VIN — Input voltage for buck regulator |
| 引脚 2 | SW — Switching node output |
| 引脚 3 | GND — Ground |
| 引脚 4 | VREF — Precise voltage reference output |
| 引脚 5 | SPI_CS — SPI chip select |
| 引脚 6 | SPI_CLK — SPI clock |
| 引脚 7 | SPI_MOSI — SPI master out slave in |
| 引脚 8 | SPI_MISO — SPI master in slave out |
| 引脚 9 | RESET — Reset output |
| 引脚 10 | WD — Window watchdog input |
| 引脚 11 | EN — Enable pin |
| 引脚 12 | VOUT — Buck regulator output |
典型应用
SPSA068 适用于 6 应用s: Automotive Body Control Module, Engine Control Unit (ECU), Infotainment System, Advanced Driver Assistance Systems (ADAS), Telematics and Connectivity, Functional Safety Systems.
Automotive Body Control Module
The SPSA068 provides a regulated power supply for MCUs in body control modules, ensuring stable operation of lighting, window, and door control systems. Its AEC-Q100 qualification and integrated watchdog enhance reliability in harsh automotive environments. The buck regulator efficiently steps down battery voltage to 3.3V or 5V for the MCU, while the precise reference ensures accurate analog sensing. The SPI interface allows dynamic configuration of output voltages and monitoring of system status. With low quiescent current in LPM, it supports always-on functions like remote keyless entry. The window watchdog monitors MCU execution, triggering a reset if the software hangs, which is critical for safety. The compact 32-QFN package fits space-constrained PCB layouts. Overall, the SPSA068 simplifies power design and improves system robustness in body control applications.
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Engine Control Unit (ECU)
In engine control units, the SPSA068 supplies clean and stable power to the MCU, which manages fuel injection, ignition timing, and emissions control. The buck regulator's high efficiency reduces heat dissipation, which is crucial in the high-temperature environment of an engine bay. The 1% accurate reference voltage ensures precise analog-to-digital conversions for sensor inputs like temperature and pressure. The window watchdog and reset output provide functional safety, detecting software faults and resetting the MCU to prevent engine damage. The SPI interface enables real-time monitoring of power supply status and configuration of output voltages. The SPSA068's AEC-Q100 qualification guarantees reliable operation over the automotive temperature range. Its integrated power MOSFETs reduce external component count, saving PCB space. The low-power mode helps reduce battery drain when the vehicle is off. Overall, the SPSA068 is a robust power solution for ECUs, enhancing performance and safety.
推荐
Infotainment System
The SPSA068 powers the MCU in infotainment systems, providing a stable 3.3V or 5V rail for the processor and peripherals. Its low quiescent current in LPM is ideal for maintaining standby functions like clock and memory retention. The buck regulator's high efficiency reduces heat, which is important in the confined space of a dashboard. The precise reference voltage ensures accurate audio and video signal processing. The SPI interface allows the infotainment system to configure output voltages and monitor power status. The window watchdog enhances system reliability by resetting the MCU if software becomes unresponsive. The compact 32-QFN package fits the tight PCB layouts of modern infotainment units. The SPSA068's AEC-Q100 qualification ensures reliable operation in the automotive environment. Overall, it provides a compact, efficient, and reliable power solution for infotainment systems.
推荐
Advanced Driver Assistance Systems (ADAS)
In ADAS applications, the SPSA068 provides reliable power to MCUs that process sensor data for features like lane keeping and collision avoidance. The buck regulator's high efficiency and low quiescent current are essential for always-on systems. The 1% accurate reference ensures precise analog signal processing for radar and camera inputs. The window watchdog and reset output are critical for functional safety, as required by ISO 26262. The SPI interface allows configuration and monitoring of the power supply. The SPSA068's AEC-Q100 qualification ensures reliable operation in the demanding automotive environment. Its compact package saves space in the crowded ADAS module. The integrated power MOSFETs reduce external components, improving reliability. Overall, the SPSA068 is a key component in ADAS power management, ensuring system safety and performance.
推荐
Telematics and Connectivity
The SPSA068 powers MCUs in telematics units that provide vehicle connectivity, such as GPS, cellular, and V2X communication. Its low quiescent current in LPM is crucial for maintaining communication modules in standby mode. The buck regulator efficiently steps down battery voltage to the required levels, reducing heat in the compact telematics enclosure. The precise reference voltage ensures accurate signal processing for communication protocols. The SPI interface allows the telematics unit to configure output voltages and monitor power status. The window watchdog enhances system reliability by resetting the MCU if software faults occur. The SPSA068's AEC-Q100 qualification ensures reliable operation in the automotive environment. Its compact package fits the space-constrained telematics module. Overall, it provides a reliable and efficient power solution for telematics applications.
推荐
Functional Safety Systems
The SPSA068 is designed for functional safety applications, providing a window watchdog and reset output to monitor MCU execution. It is AEC-Q100 qualified and supports ISO 26262 requirements. The buck regulator provides a stable power supply, while the precise reference ensures accurate voltage monitoring. The SPI interface allows configuration of safety parameters. In safety-critical systems like airbag controllers and braking systems, the SPSA068 ensures that the MCU operates correctly and can be reset if a fault is detected. Its low quiescent current is beneficial for always-on safety monitoring. The compact package saves space in safety modules. The integrated power MOSFETs reduce component count, improving reliability. Overall, the SPSA068 is a key component in functional safety systems, enhancing system integrity and compliance.
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推荐产品汇总
工程参考数据： SPSA068 ——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 | SPSA068-TR | SPSA068 | SPSA068 |
|---|---|---|---|---|
| Package | 32-QFN (5x5 mm) | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Buck Output Voltage Options | 5.0 V, 3.3 V, 1.2 V | 5.0 V, 3.3 V, 1.2 V | 5.0 V, 3.3 V, 1.2 V | 5.0 V, 3.3 V, 1.2 V |
| Buck Output Current | 0.5 A and 1.0 A | 0.5 A and 1.0 A | 0.5 A and 1.0 A | 0.5 A and 1.0 A |
| Switching Frequency | 0.4/2.4 MHz | 0.4/2.4 MHz | 0.4/2.4 MHz | 0.4/2.4 MHz |
| Reference Voltage Accuracy | 1% | 1% | 1% | 1% |
| Quiescent Current (LPM) | 50 μA typ | 50 μA typ | 50 μA typ | 50 μA typ |
| Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
关键差异点
- Integrated buck regulator and precise reference in one package （对比 Discrete buck converter + reference)
- AEC-Q100 qualified for automotive applications （对比 Non-automotive PMICs)
- Low quiescent current of 50 μA in LPM （对比 PMICs with higher quiescent current)
设计说明
Ensure adequate input and output capacitance for the buck regulator. A 10 μF ceramic capacitor on the input and a 22 μF ceramic capacitor on the output are recommended for stable operation. Place capacitors close to the pins to minimize parasitic inductance.
For the switching node (SW), keep the trace short and wide to minimize parasitic inductance and EMI. Use a solid ground plane underneath the IC to provide a low-impedance return path. Follow the layout guidelines in the STEVAL-SPSA068 evaluation board user manual (UM3488).
Configure the NVM settings correctly for the desired output voltage and switching frequency. Incorrect settings can lead to improper operation. Also, ensure the SPI interface is properly initialized to avoid communication errors. Refer to the datasheet for the configuration procedure.
合规信息
AEC-Q100 qualified per ST datasheet. RoHS and REACH compliance assumed based on ST's standard compliance, but not explicitly stated in the provided data.
