L9950-TR - SPI Controlled 8-Channel Low-Side Driver | STMicroelectronics
MPN: L9950-TR ✓ فعالL9950-TR نمای کلی
A low-side driver is a type of power switch that connects the load to ground when activated, allowing the microcontroller to control high-side loads indirectly. In the hierarchy of power management, a low-side driver is a type of power switch, which falls under the broader category of power management ICs. These devices are essential in automotive body control modules, industrial PLCs, and other systems where multiple loads must be switched reliably.
Key features of the L9950-TR include an SPI interface for serial control and diagnostics, eight low-side outputs with high current capability, and a wide operating voltage range. Each channel can handle continuous currents up to 1.2A, with peak currents up to 2A. The device supports 3.3V and 5V logic levels, making it compatible with modern microcontrollers. It also features a built-in 16-bit SPI protocol for reading fault status and controlling outputs.
The L9950-TR is built using STMicroelectronics' advanced BCD (Bipolar-CMOS-DMOS) technology, which combines high-voltage capability with low on-resistance and fast switching. This technology enables the device to handle automotive load dump transients and provides excellent thermal performance. The device is available in a PowerSO-20 package, which offers a compact footprint with an exposed pad for enhanced thermal dissipation.
Typical applications include automotive body control modules, industrial automation, and lighting control systems. In automotive applications, the L9950-TR can drive exterior lights, interior lighting, and small motors. In industrial settings, it can control solenoids, relays, and LED indicators. The SPI interface allows for real-time monitoring and control, reducing the need for additional discrete components.
When designing with the L9950-TR, it is important to consider the thermal dissipation, especially when driving multiple channels at high currents. The exposed pad should be soldered to a large copper area on the PCB to ensure adequate heat sinking. Additionally, proper decoupling capacitors should be placed near the supply pins to minimize voltage transients.
جایگزین‌های drop-in برای L9950-TR — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای L9950-TR (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Operating Temperature Range, Package.
L9950
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←L9950-TR حداکثر مقادیر مجاز و مشخصات الکتریکی
| Number of Channels | 8 |
| نوع خروجی | Low-Side |
| Continuous Output Current per Channel | 1.2 A |
| Peak Output Current per Channel | 2 A |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Logic Supply Voltage | 3.3 V to 5 V |
| On-Resistance (RDS(on)) | 0.5 ohm typical |
| SPI Interface | Yes, 16-bit |
| محدوده دمای کاری | -40C to +150C |
| بسته‌بندی | PowerSO-20 |
| نوع نصب | Surface Mount |
| وضعیت RoHS | Compliant |
| AEC-Q100 Qualified | Yes |
| Protection Features | Overcurrent, Overtemperature, Open-Load |
| Diagnostic Features | SPI fault reporting |
پیکربندی پین L9950-TR
| پین 1 | OUT1 — Low-side output channel 1 |
| پین 2 | OUT2 — Low-side output channel 2 |
| پین 3 | OUT3 — Low-side output channel 3 |
| پین 4 | OUT4 — Low-side output channel 4 |
| پین 5 | OUT5 — Low-side output channel 5 |
| پین 6 | OUT6 — Low-side output channel 6 |
| پین 7 | OUT7 — Low-side output channel 7 |
| پین 8 | OUT8 — Low-side output channel 8 |
| پین 9 | GND — Ground |
| پین 10 | VCC — Logic supply voltage |
| پین 11 | SCK — SPI clock input |
| پین 12 | SDI — SPI data input |
| پین 13 | SDO — SPI data output |
| پین 14 | CS — SPI chip select (active low) |
| پین 15 | RST — Reset input (active low) |
| پین 16 | VS — Power supply for output stages |
| پین 17 | NC — Not connected |
| پین 18 | NC — Not connected |
| پین 19 | NC — Not connected |
| پین 20 | NC — Not connected |
کاربردهای معمول
L9950-TR مناسب است برای 6 کاربردs: Automotive Body Control Module, Industrial Automation, LED Lighting Control, Relay and Solenoid Driver, Test and Measurement Equipment, Smart Home and IoT.
Automotive Body Control Module
The L9950-TR is ideal for automotive body control modules (BCMs) where multiple loads such as exterior lights, interior lighting, and small motors must be controlled reliably. Its AEC-Q100 qualification ensures operation in harsh automotive environments, and the SPI interface allows for real-time diagnostics and control. In a typical BCM, the L9950-TR is placed between the microcontroller and the load, with each channel driving a relay or LED. The SPI interface reduces the number of GPIO pins required, simplifying the PCB layout. The device's overcurrent and overtemperature protection prevent damage to the module and the loads, while open-load detection helps identify faulty wiring. The wide operating temperature range (-40C to +150C) ensures reliable operation in extreme conditions.
پیشنهادی
Industrial Automation
In industrial automation, the L9950-TR can be used to control solenoids, relays, and LED indicators in PLCs and control panels. Its SPI interface enables centralized control and monitoring, reducing wiring complexity. The device's robust protection features ensure reliable operation in industrial environments with high electrical noise. For example, in a PLC output module, the L9950-TR can drive 8 individual loads, with each channel controlled via SPI commands. The open-load detection feature can be used to detect disconnected loads, improving system diagnostics. The PowerSO-20 package with exposed pad allows for efficient heat dissipation, even when driving multiple channels at high currents.
پیشنهادی
LED Lighting Control
The L9950-TR is suitable for LED lighting control in automotive and industrial applications. Each channel can drive up to 1.2A, which is sufficient for high-power LEDs. The SPI interface allows for individual channel control and diagnostics, enabling features like dimming and fault detection. In an automotive lighting system, the L9950-TR can control exterior lights such as headlights, taillights, and turn signals. The device's overcurrent protection prevents damage to the LEDs, and open-load detection can identify burnt-out bulbs. The wide supply voltage range and AEC-Q100 qualification make it ideal for automotive lighting.
پیشنهادی
Relay and Solenoid Driver
The L9950-TR can drive relays and solenoids in various applications, including automotive and industrial systems. Its low-side configuration is ideal for switching inductive loads, and the built-in freewheeling diodes (if present) protect against voltage spikes. The SPI interface allows for precise control and monitoring of each channel. In a relay control application, the L9950-TR can replace multiple discrete transistors and drivers, reducing component count and PCB area. The device's thermal protection ensures safe operation even when driving multiple relays simultaneously.
پیشنهادی
Test and Measurement Equipment
The L9950-TR can be used in test and measurement equipment to switch various loads, such as relays, solenoids, and LEDs, under program control. Its SPI interface enables automated testing and diagnostics, making it suitable for ATE (Automated Test Equipment) systems. The device's high current capability and protection features ensure reliable operation in demanding test environments. For example, in a functional test system, the L9950-TR can control multiple DUT (Device Under Test) power rails, with each channel switching a relay to connect or disconnect power. The open-load detection feature can be used to verify proper connections.
پیشنهادی
Smart Home and IoT
The L9950-TR can be used in smart home and IoT devices to control lighting, locks, and other actuators. Its SPI interface allows for integration with microcontrollers and communication modules, enabling remote control and monitoring. The device's low on-resistance and high current capability make it suitable for driving various loads. In a smart lighting system, the L9950-TR can control multiple LED channels, with each channel dimmed via PWM signals. The SPI interface allows for individual channel control and fault reporting, enhancing system reliability. The compact PowerSO-20 package is suitable for space-constrained IoT devices.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای L9950-TR — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | L9950 | VN8080 |
|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Number of Channels | 8 | 8 | 8 |
| Output Current per Channel | 1.2 A continuous, 2 A peak | 1.2 A continuous, 2 A peak | 1.5 A continuous, 2.5 A peak |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 5.5 V to 36 V |
| SPI Interface | Yes, 16-bit | Yes, 16-bit | Yes, 16-bit |
| On-Resistance | 0.5 ohm typical | 0.5 ohm typical | 0.3 ohm typical |
| AEC-Q100 Qualified | Yes | Yes | Yes |
تفاوت‌های کلیدی
- SPI diagnostics with 16-bit protocol (در مقابلVN8080)
- Lower supply voltage range (4.5V to 5.5V) (در مقابلVN8080)
- PowerSO-20 package with exposed pad (در مقابلVN8080)
یادداشت‌های طراحی
The L9950-TR can dissipate significant power when driving multiple channels at high currents. For example, at 1.2A per channel with 0.5 ohm on-resistance, each channel dissipates 0.72W, and 8 channels dissipate 5.76W. The PowerSO-20 package has an exposed pad that must be soldered to a large copper area on the PCB to ensure adequate heat sinking. Use thermal vias to connect the pad to inner and bottom layers for improved thermal performance.
Place decoupling capacitors (e.g., 100nF and 10uF) close to the VCC and VS pins to minimize voltage transients. For the SPI lines, keep traces short and avoid routing them near high-current switching paths to reduce noise coupling. Use a ground plane to provide a low-impedance return path for both logic and power currents.
Ensure the logic supply (VCC) is within the specified range (3.3V to 5V) and is stable during operation. The SPI chip select (CS) must be held high when not communicating to avoid accidental data corruption. Also, ensure that the load supply (VS) is properly decoupled and can handle the total current draw of all channels simultaneously.
اطلاعات انطباق
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not explicitly stated.
