L9979 - Automotive Quad Low-Side Driver | STMicroelectronics
料号： L9979 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.8 | $280.00 |
| 500 | $2.52 | $1,260.00 |
| 1,000 | $2.24 | $2,240.00 |
L9979 概述
A low-side driver is a type of power switch that connects the load to ground when activated, with the load connected between the positive supply and the driver output. In automotive systems, low-side drivers are commonly used to control relays, solenoids, and lamps, where the load is referenced to the battery positive rail. The L9979 belongs to the family of smart power switches, which integrate protection and diagnostic functions to enhance system reliability.
Key features of the L9979 include four low-side outputs with a maximum continuous current of per channel, an operating voltage range of , and built-in overcurrent, overtemperature, and short-circuit protection. The device also provides a serial peripheral interface (SPI) for advanced diagnostics and control, enabling real-time monitoring of output states and fault conditions. The L9979 is available in a package, which is designed for automotive PCB assembly and thermal performance.
The L9979 utilizes a robust power MOSFET technology with integrated protection circuitry, ensuring reliable operation in harsh automotive environments. The SPI interface allows a microcontroller to configure output parameters, read diagnostic information, and control each channel independently. The device is designed to meet AEC-Q100 automotive qualification standards, ensuring its suitability for mission-critical applications.
Typical applications include automotive body control modules (BCMs) for controlling exterior and interior lighting, relay drivers for power distribution, solenoid drivers in transmission control units, and LED drivers for daytime running lights. The L9979's ability to handle inductive loads with built-in freewheeling protection makes it ideal for relay and solenoid actuation.
When designing with the L9979, ensure proper PCB layout with adequate copper area for thermal dissipation, and place decoupling capacitors close to the power supply pins. The SPI interface should be isolated from high-current traces to minimize noise coupling. For inductive loads, verify that the freewheeling protection is sufficient for the load's energy rating.
直接替换替代料： L9979 ——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： L9979 （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature Range, Diagnostic Output, MSL Level, Output Current (Continuous).
快速对比工具——选择替代料号进行并排对比：
L9978
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.1 / 个
查看数据手册 →VNQ5050AKTR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.27 / 个
查看数据手册 →BTS7002-1EPA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9979 最大额定值与电气特性
| 输出数量 | 4 |
| 输出类型 | Low-Side |
| 接口 | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40C to +150C |
| AEC-Q100 Qualified | Yes |
| RoHS Compliant | Yes |
| Diagnostic Output | SPI |
L9979 引脚配置
| 引脚 1 | OUT1 — Low-side output 1 |
| 引脚 2 | OUT2 — Low-side output 2 |
| 引脚 3 | OUT3 — Low-side output 3 |
| 引脚 4 | OUT4 — Low-side output 4 |
| 引脚 5 | GND — Ground |
| 引脚 6 | VCC — Power supply |
| 引脚 7 | SCK — SPI clock |
| 引脚 8 | SDI — SPI data input |
| 引脚 9 | SDO — SPI data output |
| 引脚 10 | CS — SPI chip select |
典型应用
L9979 适用于 6 应用s: Automotive Body Control Module, Transmission Control Unit, LED Lighting Systems, Relay Driver, Industrial Automation, Power Distribution.
Automotive Body Control Module
The L9979 is used in body control modules to drive exterior and interior lighting, relays, and other loads. Its quad low-side outputs and SPI diagnostics enable efficient control and monitoring of multiple loads, reducing component count and PCB area. The device's automotive qualification ensures reliable operation in harsh environments.
推荐
Transmission Control Unit
In transmission control units, the L9979 drives solenoids for hydraulic control. Its low-side configuration and built-in freewheeling protection handle inductive loads, while SPI diagnostics provide real-time feedback for fault detection. The device's high-temperature rating supports under-hood applications.
推荐
LED Lighting Systems
The L9979 can drive LED loads in automotive lighting, such as daytime running lights and taillights. Its current capability and diagnostic features allow precise control and fault detection, ensuring compliance with automotive lighting standards. The device's low-side topology simplifies LED string configuration.
推荐
Relay Driver
The L9979 is ideal for driving relays in automotive power distribution. Its low-side outputs can directly control relay coils, and the integrated freewheeling protection eliminates external flyback diodes. SPI diagnostics enable monitoring of relay status and fault conditions, improving system reliability.
推荐
Industrial Automation
Although designed for automotive, the L9979 can be used in industrial automation for driving solenoids, valves, and lamps. Its robust protection and wide operating temperature range make it suitable for factory environments. SPI diagnostics allow integration with PLCs and industrial controllers.
推荐
Power Distribution
The L9979 can be used in power distribution modules to switch loads such as fans, pumps, and heaters. Its low-side configuration and diagnostic capabilities enable efficient load management and fault detection. The device's automotive qualification ensures reliability in vehicle power distribution systems.
推荐
推荐产品汇总
工程参考数据： L9979 ——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 | L9978 | VNQ5050AK | BTS7002-1EPA |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon |
| Number of Outputs | 4 | 4 | 4 | 1 |
| Output Type | Low-Side | Low-Side | High-Side | High-Side |
| Interface | SPI | SPI | SPI | SPI |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
关键差异点
- Quad low-side driver with SPI diagnostics （对比 BTS7002-1EPA)
- Automotive AEC-Q100 qualification （对比 VNQ5050AK)
- Integrated protection features （对比 L9978)
设计说明
Ensure adequate copper area for thermal dissipation on the PCB, especially for high-current outputs. Place decoupling capacitors (e.g., 100nF and 10uF) close to the VCC pin to filter supply noise. For SPI lines, keep traces short and avoid routing near high-current paths to minimize noise coupling.
The L9979's power dissipation depends on the output current and supply voltage. Calculate the junction temperature using the package's thermal resistance and ensure it stays below the maximum rating. For high-current applications, consider adding thermal vias and a larger copper pour.
When driving inductive loads, ensure the built-in freewheeling protection is adequate for the load's energy. Do not exceed the maximum output current rating. Also, verify that the SPI communication is properly configured with correct polarity and phase to avoid communication errors.
合规信息
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in the provided data.