L9956-TR - Automotive 8-Channel Low-Side Driver | STMicroelectronics
부품 번호: L9956-TR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 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 |
L9956-TR 개요
A low-side driver is a type of power switch that connects the load to ground when activated, commonly used in automotive systems to control lamps, relays, solenoids, and LEDs. In the system hierarchy, the L9956-TR functions as a power management IC within the broader category of automotive power switches, which are essential for body control modules (BCMs), lighting control, and actuator driving. Its SPI interface enables microcontroller-based control and real-time diagnostics, making it a key component in smart power distribution.
Key features include eight low-side outputs with a maximum current of 1.5 A per channel, an operating voltage range of 4.5 V to 5.5 V for the logic supply, and a load supply voltage up to 28 V. The device provides overcurrent, overtemperature, and open-load detection, with fault reporting via SPI. It also features a standby mode with low quiescent current, making it suitable for battery-powered automotive applications.
Technically, the L9956-TR uses a smart power technology that integrates power MOSFETs with CMOS control logic on a single die. This architecture allows for precise current control, fast switching, and robust protection. The SPI interface supports daisy-chaining of multiple devices, enabling scalable designs for multi-channel control. The PowerSO-36 package offers a thermal resistance of 30 C/W, facilitating heat dissipation in high-current applications.
Typical applications include automotive body control modules, interior and exterior lighting control, relay and solenoid drivers, and general-purpose low-side switching in 12V automotive systems. The device's diagnostic capabilities make it ideal for applications requiring fault detection and reporting, such as lamp failure detection in lighting systems.
When designing with the L9956-TR, ensure proper thermal management by providing adequate copper area on the PCB for the exposed pad. Additionally, place a 100 nF decoupling capacitor close to the logic supply pin and a bulk capacitor on the load supply to handle inrush currents. The SPI lines should be kept short and shielded to minimize noise in the automotive environment.
드롭인 대체품: L9956-TR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: L9956-TR (동일 폼 팩터 및 풋프린트).
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
L9956
✅ 드롭인✓ 재고 있음
$2.88 / 개
데이터시트 보기 →L9956-TR 최대 정격 & 전기적 특성
| Number of Channels | 8 |
| 출력 유형 | Low-Side |
| Maximum Output Current per Channel | 1.5 A |
| Logic Supply Voltage | 4.5 V to 5.5 V |
| Load Supply Voltage | Up to 28 V |
| 인터페이스 | SPI |
| Diagnostics | Overcurrent, Overtemperature, Open-Load |
| 동작 온도 | -40C to +150C |
| 패키지 | PowerSO-36 |
| 실장 유형 | Surface Mount |
| 열 저항 | 30 C/W |
| RoHS 상태 | Compliant |
| AEC-Q100 | Qualified |
L9956-TR 핀 구성
| 핀 1 | OUT1 — Low-side output channel 1 |
| 핀 2 | OUT2 — Low-side output channel 2 |
| 핀 3 | OUT3 — Low-side output channel 3 |
| 핀 4 | OUT4 — Low-side output channel 4 |
| 핀 5 | OUT5 — Low-side output channel 5 |
| 핀 6 | OUT6 — Low-side output channel 6 |
| 핀 7 | OUT7 — Low-side output channel 7 |
| 핀 8 | OUT8 — Low-side output channel 8 |
| 핀 9 | GND — Ground |
| 핀 10 | VCC — Logic supply voltage (4.5V to 5.5V) |
| 핀 11 | VS — Load supply voltage (up to 28V) |
| 핀 12 | SCK — SPI clock input |
| 핀 13 | SI — SPI data input |
| 핀 14 | SO — SPI data output |
| 핀 15 | CS — SPI chip select (active low) |
| 핀 16 | RST — Reset input (active low) |
일반적인 애플리케이션
L9956-TR 적합 용도: 6 애플리케이션s: Automotive Body Control Module, Automotive Lighting Control, Relay and Solenoid Driver, Industrial Low-Side Switching, LED Lighting Control, Automotive Actuator Control.
Automotive Body Control Module
The L9956-TR is ideal for body control modules (BCMs) that manage lighting, locks, and windows. Its 8 low-side channels can drive multiple loads, while SPI diagnostics enable fault detection and reporting. The device's AEC-Q100 qualification ensures reliability in automotive environments. In a typical BCM, the L9956-TR is placed on the PCB with a microcontroller, using SPI to control each output. The load supply is connected to the vehicle battery (12V), and each channel drives a lamp, relay, or solenoid. The device's overcurrent and open-load detection help identify faulty loads, reducing warranty costs. Compared to discrete MOSFETs, the L9956-TR simplifies design and reduces component count, improving overall system reliability.
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Automotive Lighting Control
The L9956-TR is well-suited for interior and exterior lighting control, including headlamps, tail lamps, and interior lights. Each channel can drive up to 1.5A, sufficient for most automotive lamps. The open-load detection feature is particularly useful for detecting burnt-out bulbs, enabling warning messages to the driver. In a lighting control module, the L9956-TR receives commands from a body control module via SPI and switches the lamps. The device's thermal management is critical, as lamps can draw high inrush currents. The PowerSO-36 package with exposed pad helps dissipate heat. Compared to relay-based systems, the L9956-TR offers faster switching and longer lifespan, while providing diagnostic feedback.
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Relay and Solenoid Driver
The L9956-TR can drive relays and solenoids in automotive systems, such as door locks, fuel injectors, and transmission solenoids. Its low-side configuration is ideal for switching these inductive loads, with built-in freewheeling protection. The device's overcurrent detection prevents damage from shorted loads. In a relay driver application, the L9956-TR is connected to the relay coil, with a flyback diode or internal clamp to handle inductive kickback. The SPI interface allows the microcontroller to control each relay independently and read status. The device's high current capability (1.5A) is sufficient for most automotive relays. Compared to discrete transistor drivers, the L9956-TR integrates protection and diagnostics, reducing external components and improving reliability.
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Industrial Low-Side Switching
Although designed for automotive, the L9956-TR can be used in industrial applications requiring multiple low-side switches with diagnostics. Its wide operating temperature range and robust protection make it suitable for factory automation and process control. In an industrial PLC, the L9956-TR can drive solenoids, valves, and indicator lamps. The SPI interface allows integration with industrial microcontrollers. The device's overcurrent and overtemperature protection ensure safe operation in harsh environments. Compared to automotive-grade parts, the L9956-TR offers similar performance at a competitive price, making it a cost-effective solution for industrial control.
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LED Lighting Control
The L9956-TR can be used for LED lighting control in automotive and industrial applications. Each channel can drive LED strings with current up to 1.5A, and the open-load detection helps identify failed LEDs. For PWM dimming, an external PWM signal can be applied to the enable pin or via SPI. In an automotive LED lighting system, the L9956-TR is used to switch LED modules, with a microcontroller providing PWM signals for dimming. The device's diagnostic features allow detection of open or shorted LEDs, improving system reliability. Compared to dedicated LED drivers, the L9956-TR offers more channels and flexibility, but lacks built-in current regulation, so external resistors are needed.
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Automotive Actuator Control
The L9956-TR is suitable for controlling various actuators in automotive systems, such as seat motors, mirror adjusters, and window lifts. Its 8 channels can drive multiple actuators, while SPI diagnostics enable fault detection. The device's high current capability and thermal management make it suitable for motor driving with external H-bridges. In an actuator control module, the L9956-TR is used to switch the low-side of the motor driver, with the high-side controlled by a separate device. The SPI interface allows the microcontroller to control each actuator and monitor status. Compared to discrete MOSFETs, the L9956-TR simplifies the design and provides integrated protection.
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추천 제품 요약
엔지니어링 참조 데이터: L9956-TR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | L9956 | TLE6228GP |
|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | DSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon |
| Number of Channels | 8 | 8 | 8 |
| Output Current per Channel | 1.5 A | 1.5 A | 0.5 A |
| Logic Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Load Supply Voltage | Up to 28V | Up to 28V | Up to 34V |
| Interface | SPI | SPI | SPI |
| Diagnostics | Overcurrent, Overtemperature, Open-Load | Overcurrent, Overtemperature, Open-Load | Overcurrent, Overtemperature, Open-Load |
| AEC-Q100 | Qualified | Qualified | Qualified |
주요 차별점
- Higher output current per channel (1.5A) compared to TLE6228GP (0.5A) (vs TLE6228GP)
- Same package and pinout as L9956, enabling drop-in replacement (vs L9956)
- AEC-Q100 qualified for automotive applications (vs TLE6228GP)
설계 노트
The L9956-TR in PowerSO-36 package has a thermal resistance of 30 C/W. At maximum load (8 channels at 1.5A each), power dissipation can be significant. For example, with a load supply of 12V and a saturation voltage of 0.5V, each channel dissipates 0.75W, totaling 6W. This would cause a temperature rise of 180C above ambient, exceeding the maximum junction temperature. Therefore, ensure adequate PCB copper area and consider derating the output current or using active cooling in high-power applications.
Place a 100nF ceramic capacitor close to the VCC pin and a 10uF electrolytic capacitor on the VS pin to handle inrush currents. The exposed pad should be soldered to a large copper area for heat dissipation. Keep SPI traces short and shielded to minimize noise, especially in automotive environments with high electromagnetic interference.
Do not exceed the absolute maximum ratings, especially the load supply voltage of 28V. Ensure the logic supply is stable and within 4.5V to 5.5V. When driving inductive loads, use external freewheeling diodes or ensure the device's internal clamp is sufficient. Also, be aware that the SPI interface requires proper pull-up resistors on the CS and SCK lines to avoid floating states.
규정 준수 정보
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.