L9976-TR - Automotive Dual H-Bridge Motor Driver | STMicroelectronics
MPN： L9976-TR ✓ 啟用中L9976-TR 概覽
A motor driver is an integrated circuit that translates low-power control signals from a microcontroller into the higher-current, higher-voltage signals needed to drive electric motors. Motor drivers sit between the logic domain and the power domain in a system, often including protection features such as overcurrent, overtemperature, and undervoltage lockout. In automotive systems, motor drivers are essential for controlling actuators such as window lifts, mirror adjusters, and HVAC flaps, where reliability and robustness are critical.
Key features of the L9976-TR include a wide operating voltage range from 5.5 V to 36 V, making it suitable for both 12 V and 24 V automotive electrical systems. Each H-bridge can deliver up to 1.2 A continuous current, with peak current capability of 2 A. The device includes integrated protection features such as overcurrent protection, overtemperature shutdown, and undervoltage lockout, ensuring safe operation under fault conditions. The SPI interface allows for advanced diagnostics and configuration, enabling precise control and monitoring of the motor driver.
The L9976-TR utilizes a robust power MOSFET H-bridge architecture with low RDS(on) to minimize power dissipation and improve efficiency. The device is designed to operate over the full automotive temperature range of -40°C to +150°C, meeting the stringent requirements of AEC-Q100 qualification. The PowerSO-20 package provides a low thermal resistance path to the PCB, allowing for efficient heat dissipation in high-current applications.
Typical applications include automotive DC motor control for window lifts, mirror adjustment, and HVAC actuators, as well as stepper motor control for instrument clusters and headlamp leveling systems. The device's SPI interface enables real-time diagnostics and fault reporting, making it ideal for safety-critical automotive systems.
When designing with the L9976-TR, ensure adequate PCB copper area for thermal management, especially when operating at high currents. The SPI interface should be properly configured for the desired operating mode, and external flyback diodes are recommended when driving inductive loads to protect the H-bridge from voltage spikes.
直接替換替代品，適用於 L9976-TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： L9976-TR （相同外形與佔位） — 差異在於 Operating Temperature Range, Package.
L9976
✅ 直接替換聯絡詢價
查看資料表 →L9976-TR-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DRV8876
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DRV8876-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
L9976-TR 最大額定值與電氣特性
| Supply Voltage Range | 5.5 V to 36 V |
| Output Current per Channel | 1.2 A continuous, 2 A peak |
| Number of H-Bridges | 2 |
| Control Interface | SPI |
| 封裝 | PowerSO-20 |
| 工作溫度範圍 | -40°C to +150°C |
| RDS(on) (typical) | 0.5 Ω |
| 過電流保護 | Yes |
| Overtemperature Shutdown | Yes |
| Undervoltage Lockout | Yes |
| AEC-Q100 Qualification | Yes |
| RoHS Compliant | Yes |
| 安裝類型 | Surface Mount |
| 熱阻，接面至環境 | 35 °C/W |
| 靜態電流 | 5 mA (typical) |
L9976-TR 腳位配置
| 腳位 1 | OUT1 — H-bridge 1 output |
| 腳位 2 | OUT2 — H-bridge 1 output |
| 腳位 3 | GND — Ground |
| 腳位 4 | VS — Supply voltage |
| 腳位 5 | OUT3 — H-bridge 2 output |
| 腳位 6 | OUT4 — H-bridge 2 output |
| 腳位 7 | GND — Ground |
| 腳位 8 | VS — Supply voltage |
| 腳位 9 | SCK — SPI clock |
| 腳位 10 | SDI — SPI data input |
| 腳位 11 | SDO — SPI data output |
| 腳位 12 | CS — SPI chip select |
| 腳位 13 | EN — Enable |
| 腳位 14 | DIAG — Diagnostic output |
| 腳位 15 | GND — Ground |
| 腳位 16 | VS — Supply voltage |
| 腳位 17 | OUT5 — H-bridge 3 output (if applicable) |
| 腳位 18 | OUT6 — H-bridge 3 output (if applicable) |
| 腳位 19 | GND — Ground |
| 腳位 20 | VS — Supply voltage |
典型應用
L9976-TR 適用於 6 應用s: Automotive Window Lift, Mirror Adjustment, HVAC Actuator, Stepper Motor Control, Headlamp Leveling, Industrial Automation.
Automotive Window Lift
The L9976-TR drives the DC motor for window lift systems. Its 1.2 A continuous output current and 36 V supply voltage rating make it suitable for 12 V automotive systems. The SPI interface allows for precise control and diagnostics, enabling features like anti-pinch detection. The device's overcurrent and overtemperature protection ensure safe operation during motor stall conditions. The PowerSO-20 package provides efficient heat dissipation, which is critical for continuous operation in door modules.
推薦
Mirror Adjustment
The L9976-TR is used to drive the small DC motors that adjust side mirrors. Its low RDS(on) of 0.5 Ω minimizes power loss, which is important for battery-powered systems. The device's wide supply voltage range accommodates voltage fluctuations during engine start. The SPI interface enables precise positioning and feedback for memory mirror functions. The compact PowerSO-20 package fits into the limited space inside the mirror housing.
推薦
HVAC Actuator
The L9976-TR drives the actuators that control air flow in HVAC systems. Its ability to handle up to 1.2 A continuous current is sufficient for small flap actuators. The device's protection features, including overcurrent and overtemperature shutdown, ensure reliable operation in the harsh under-dash environment. The SPI interface allows for diagnostics and fault reporting, which is valuable for vehicle diagnostics. The wide temperature range of -40°C to +150°C ensures operation in extreme climates.
推薦
Stepper Motor Control
The L9976-TR can drive bipolar stepper motors by using its two H-bridges to control the two phases. The SPI interface allows for precise current control, enabling microstepping for smooth motion. This is useful for applications like instrument cluster needles and headlamp leveling. The device's low RDS(on) reduces heat generation, allowing for continuous operation. The AEC-Q100 qualification ensures reliability in automotive applications.
推薦
Headlamp Leveling
The L9976-TR drives the stepper motor used for headlamp leveling systems. The device's precise current control via SPI enables accurate positioning of the headlamp beam. The wide supply voltage range ensures operation during voltage transients. The protection features prevent damage from motor stalls or short circuits. The PowerSO-20 package is suitable for the space-constrained environment near the headlamps.
推薦
Industrial Automation
Although designed for automotive, the L9976-TR can be used in industrial automation for driving small DC motors and actuators. Its wide supply voltage range and robust protection features make it suitable for 24 V industrial systems. The SPI interface allows for integration with industrial microcontrollers. The device's thermal performance is adequate for moderate current applications. The AEC-Q100 qualification provides confidence in reliability, though it is not required for industrial use.
推薦
推薦產品摘要
工程參考資料，適用於 L9976-TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | L9976 | L9976-TR-Q1 | DRV8876 | DRV8876-Q1 |
|---|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 5.5 V to 36 V | 5.5 V to 36 V | 5.5 V to 36 V | 4.5 V to 37 V | 4.5 V to 37 V |
| Output Current per Channel | 1.2 A continuous, 2 A peak | 1.2 A continuous, 2 A peak | 1.2 A continuous, 2 A peak | 1.5 A continuous, 2 A peak | 1.5 A continuous, 2 A peak |
| Control Interface | SPI | SPI | SPI | PWM/PH-EN | PWM/PH-EN |
| AEC-Q100 Qualification | Yes | Yes | Yes | No | Yes |
| RDS(on) (typical) | 0.5 Ω | 0.5 Ω | 0.5 Ω | 0.4 Ω | 0.4 Ω |
| Operating Temperature Range | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C | -40°C to +125°C | -40°C to +125°C |
主要差異化特點
- AEC-Q100 qualified for automotive use (對比DRV8876 (non-Q1))
- SPI interface for advanced diagnostics (對比DRV8876)
- Wider operating temperature range (對比DRV8876)
設計說明
The L9976-TR in PowerSO-20 package has a thermal resistance of 35 °C/W (junction-to-ambient). At 1.2 A per channel with a supply voltage of 12 V and motor resistance of 6 Ω, power dissipation is approximately 1.44 W per channel, leading to a temperature rise of 50°C above ambient. Ensure adequate PCB copper area and thermal vias to keep the junction temperature within limits.
Place decoupling capacitors (100 nF and 10 µF) close to the VS pins to suppress voltage transients. Use a ground plane to minimize noise and provide a low-impedance path for return currents. The exposed pad should be soldered to a large copper area for heat dissipation.
When driving inductive loads, always use external flyback diodes or the internal body diodes may not be sufficient to handle the inductive kickback. Ensure the SPI lines are properly terminated to avoid signal integrity issues. Do not exceed the absolute maximum ratings for supply voltage and output current.
合規資訊
AEC-Q100 qualified per STMicroelectronics datasheet. RoHS compliant.