L9955-TR - SPI Controlled 8-Channel Low-Side Driver | STMicroelectronics
料号： L9955-TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.15 | $1,575.00 |
| 1,000 | $2.7 | $2,700.00 |
L9955-TR 概述
A low-side driver is a type of power switch that connects the load to ground when activated, allowing the microcontroller to control high-current loads with minimal logic-level signals. In the hierarchy of power management, a low-side driver falls under the category of power switches, which are essential components in automotive body control modules, industrial automation, and smart actuator systems. The L9955-TR specifically provides eight independent channels, each capable of sinking significant current, with a serial peripheral interface (SPI) for configuration and real-time fault reporting.
Key features of the L9955-TR include an operating voltage range of 4.5V to 5.5V for the logic supply, with the power stage capable of handling up to 40V. Each channel can sink up to 1.2A continuous current, with a maximum of 2A for short durations. The SPI interface operates at up to 5 MHz, enabling fast communication with microcontrollers. The device also includes a 16-bit diagnostic readback, allowing precise monitoring of each channel's status, including open-load, short-to-ground, and overtemperature conditions.
From a technical architecture perspective, the L9955-TR utilizes a smart power technology that integrates CMOS logic with high-voltage power MOSFETs on a single die. This integration reduces external component count and enhances reliability. The device features a built-in charge pump for gate driving, ensuring efficient switching even at low battery voltages. Additionally, the SPI interface supports daisy-chaining of multiple devices, simplifying PCB layout in multi-channel systems.
Typical applications include automotive body control modules, where the L9955-TR drives exterior lighting, wiper motors, and door locks. In industrial settings, it is used for controlling solenoids in pneumatic systems and actuators in robotic arms. The device's diagnostic capabilities make it particularly suitable for safety-critical applications where fault detection is essential.
When designing with the L9955-TR, it is crucial to ensure proper thermal management, as the power dissipation across the low-side switches can be significant. A thermal pad on the package should be connected to a large copper area on the PCB to facilitate heat dissipation. Additionally, the SPI lines should be properly terminated to avoid signal integrity issues, and the supply pins should be decoupled with ceramic capacitors close to the device.
直接替换替代料： L9955-TR ——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： L9955-TR （相同外形与封装尺寸） ——差异在于 Mounting Type, Number of Channels, Operating Temperature Range, Package.
快速对比工具——选择替代料号进行并排对比：
L9955
✅ 直接替换✓ 有现货
$0.75 / 个
查看数据手册 →TLE6228GP
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC33879
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9955-TR 最大额定值与电气特性
| Number of Channels | 8 |
| 输出类型 | Low-Side Driver |
| Supply Voltage (Logic) | 4.5 V to 5.5 V |
| Supply Voltage (Power Stage) | Up to 40 V |
| Output Current per Channel | 1.2 A continuous, 2 A peak |
| SPI Interface | Yes, up to 5 MHz |
| Diagnostic Readback | 16-bit |
| Protection Features | Overcurrent, Overtemperature, Open-Load |
| 工作温度范围 | -40°C to +150°C |
| 封装 | PowerSO-36 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| AEC-Q100 Qualified | Yes |
L9955-TR 引脚配置
| 引脚 1 | OUT1 — Low-side driver output channel 1 |
| 引脚 2 | OUT2 — Low-side driver output channel 2 |
| 引脚 3 | OUT3 — Low-side driver output channel 3 |
| 引脚 4 | OUT4 — Low-side driver output channel 4 |
| 引脚 5 | OUT5 — Low-side driver output channel 5 |
| 引脚 6 | OUT6 — Low-side driver output channel 6 |
| 引脚 7 | OUT7 — Low-side driver output channel 7 |
| 引脚 8 | OUT8 — Low-side driver output channel 8 |
| 引脚 9 | GND — Ground |
| 引脚 10 | VCC — Logic supply voltage (4.5V to 5.5V) |
| 引脚 11 | VS — Power stage supply voltage (up to 40V) |
| 引脚 12 | SCK — SPI clock input |
| 引脚 13 | SI — SPI data input |
| 引脚 14 | SO — SPI data output |
| 引脚 15 | CS — SPI chip select (active low) |
| 引脚 16 | RST — Reset input (active low) |
典型应用
L9955-TR 适用于 6 应用s: Automotive Body Control Module, Industrial Automation, Smart Actuator Systems, LED Lighting Control, Relay and Solenoid Driving, Safety-Critical Systems.
Automotive Body Control Module
The L9955-TR is ideal for automotive body control modules, where it drives exterior lighting, wiper motors, and door locks. Its 8 channels can control multiple loads, while the SPI interface provides real-time diagnostics for fault detection. The device's AEC-Q100 qualification ensures reliability in harsh automotive environments. With a supply voltage up to 40V, it can handle load dump transients, and the overcurrent protection prevents damage to the module. The low-side driver topology is well-suited for grounding loads, and the integrated charge pump ensures efficient switching even at low battery voltages. The SPI interface allows the microcontroller to monitor each channel's status, enabling predictive maintenance and reducing warranty costs. The PowerSO-36 package with exposed thermal pad facilitates heat dissipation, ensuring stable operation under high ambient temperatures.
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Industrial Automation
In industrial automation, the L9955-TR is used to control solenoids in pneumatic systems and actuators in robotic arms. Its high current capability (1.2A per channel) and diagnostic features make it suitable for safety-critical applications. The SPI interface enables centralized control and monitoring, reducing wiring complexity. The device's wide operating temperature range (-40°C to +150°C) ensures reliable operation in factory environments. The overcurrent and overtemperature protection prevent damage to the device and connected loads, minimizing downtime. The low-side driver configuration is compatible with standard industrial loads, and the integrated charge pump allows operation at low supply voltages. The PowerSO-36 package is robust and suitable for industrial PCBs, and the exposed thermal pad aids in heat dissipation, ensuring long-term reliability.
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Smart Actuator Systems
The L9955-TR is well-suited for smart actuator systems, where it drives motors and solenoids with precise control and diagnostics. Its SPI interface allows for real-time monitoring of each channel, enabling predictive maintenance and fault detection. The device's 8 channels can control multiple actuators, reducing component count and PCB area. The high current capability and wide supply voltage range make it versatile for various actuator types. The integrated protection features ensure safe operation under fault conditions, such as short circuits or overtemperature. The AEC-Q100 qualification makes it suitable for automotive actuator systems, while the PowerSO-36 package provides excellent thermal performance. The low-side driver topology is ideal for grounding loads, and the charge pump ensures efficient switching at low voltages.
推荐
LED Lighting Control
The L9955-TR can be used for LED lighting control, particularly in automotive exterior lighting such as tail lights and turn signals. Each channel can sink up to 1.2A, sufficient for driving multiple LEDs in series. The SPI interface allows for individual channel control and diagnostics, enabling features like dynamic turn signals and fault detection. The device's wide supply voltage range accommodates automotive battery voltage variations, and the overcurrent protection prevents LED damage. The low-side driver configuration is compatible with common LED circuits, and the integrated charge pump ensures efficient switching. The AEC-Q100 qualification ensures reliability in automotive lighting applications, and the PowerSO-36 package provides adequate thermal management for LED loads.
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Relay and Solenoid Driving
The L9955-TR is ideal for driving relays and solenoids in various applications, including automotive and industrial systems. Its high current capability (1.2A per channel) can drive most relays and solenoids directly, eliminating the need for external transistors. The SPI interface provides diagnostics for each channel, allowing detection of open-load or short-circuit conditions. The device's protection features, such as overcurrent and overtemperature, ensure safe operation. The wide supply voltage range (up to 40V) makes it suitable for automotive and industrial power rails. The low-side driver topology is standard for relay and solenoid control, and the integrated charge pump ensures reliable switching. The PowerSO-36 package is robust and suitable for high-current applications.
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Safety-Critical Systems
The L9955-TR is suitable for safety-critical systems due to its comprehensive diagnostic capabilities and AEC-Q100 qualification. The SPI interface provides real-time monitoring of each channel, enabling detection of faults such as open-load, short-to-ground, and overtemperature. This allows the system to respond quickly to failures, enhancing safety. The device's overcurrent and overtemperature protection prevent damage to the device and connected loads. The wide operating temperature range (-40°C to +150°C) ensures reliable operation in extreme conditions. The low-side driver topology is commonly used in safety systems, and the integrated charge pump ensures efficient switching. The PowerSO-36 package provides excellent thermal performance, and the device's robust design meets automotive safety standards.
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推荐产品汇总
工程参考数据： L9955-TR ——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 | L9955 | TLE6228GP | MC33879 |
|---|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon | NXP Semiconductors |
| Number of Channels | 8 | 8 | 8 | 8 |
| SPI Interface | Yes, up to 5 MHz | Yes, up to 5 MHz | Yes | Yes |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
关键差异点
- Integrated 16-bit diagnostic readback （对比 TLE6228GP)
- AEC-Q100 qualified （对比 MC33879)
- High output current capability （对比 TLE6228GP)
设计说明
The L9955-TR can dissipate significant power when driving high currents. Ensure the exposed thermal pad on the PowerSO-36 package is soldered to a large copper area on the PCB to facilitate heat dissipation. For continuous operation at 1.2A per channel, calculate the power dissipation and verify the junction temperature stays within the specified range.
Place decoupling capacitors (e.g., 100nF ceramic) close to the VCC and VS pins to filter high-frequency noise. For the SPI lines, use series resistors (e.g., 33Ω) to reduce ringing and ensure signal integrity. Keep the SPI traces short and avoid routing them near high-current switching paths.
Do not exceed the maximum supply voltage of 40V on the VS pin. Ensure the logic supply (VCC) is within 4.5V to 5.5V to avoid malfunction. When driving inductive loads, use freewheeling diodes or the device's internal clamp to prevent voltage spikes. Also, ensure the SPI chip select (CS) is properly pulled high when not in use to avoid unintended communication.
合规信息
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.