L9976 - Automotive Dual H-Bridge Motor Driver | STMicroelectronics
料号： L9976 ✓ 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 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
L9976 概述
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. In automotive systems, motor drivers are essential for functions such as window lifts, mirror adjustment, seat positioning, and HVAC actuators. The L9976 sits within the power management and actuation hierarchy, bridging the digital control domain (MCU) and the electromechanical domain (motors).
Key features of the L9976 include a low RDS(on) of 0.5 ohm per switch, which minimizes power dissipation and improves efficiency. It provides overcurrent, overtemperature, and undervoltage protection, ensuring robust operation in harsh automotive environments. The device also features a serial peripheral interface (SPI) for advanced diagnostics and control, allowing the microcontroller to read fault status and configure operating modes. The PowerSO-28 package offers a thermal resistance of 35 C/W, enabling reliable operation at high ambient temperatures.
The L9976 utilizes a standard H-bridge topology with integrated freewheeling diodes, eliminating the need for external clamping components. The SPI interface supports daisy-chaining of multiple devices, simplifying PCB layout in multi-motor systems. The device is AEC-Q100 qualified, meeting the stringent reliability requirements of automotive applications.
Typical applications include automotive body control modules, power window lift systems, mirror adjustment units, and HVAC actuator control. The wide supply voltage range accommodates both 12V and 24V automotive electrical systems, and the low quiescent current of 10 uA in standby mode helps reduce battery drain when the vehicle is off.
When designing with the L9976, ensure adequate PCB copper area for thermal dissipation, especially when driving motors at high currents. The SPI interface should be properly configured for fault monitoring, and the supply pins must be decoupled with a 100nF ceramic capacitor close to the device to suppress switching noise.
直接替换替代料： L9976 ——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： L9976 （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, Package.
快速对比工具——选择替代料号进行并排对比：
L9976A
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9976 最大额定值与电气特性
| Supply Voltage Range | 5.5 V to 36 V |
| Output Current (Continuous) | 1.2 A per channel |
| Output Current (Peak) | 2 A per channel |
| RDS(on) per Switch | 0.5 ohm |
| Number of H-Bridges | 2 |
| Control Interface | SPI |
| Protection Features | Overcurrent, Overtemperature, Undervoltage |
| Quiescent Current (Standby) | 10 uA |
| 工作温度范围 | -40C to +150C |
| 封装 | PowerSO-28 |
| 安装类型 | Surface Mount |
| Thermal Resistance (theta_JA) | 35 C/W |
| AEC-Q100 Qualification | Yes |
| RoHS 状态 | Compliant |
| MSL 等级 | 3 |
L9976 引脚配置
| 引脚 1 | OUT1 — H-bridge 1 output |
| 引脚 2 | OUT2 — H-bridge 1 output |
| 引脚 3 | VS — Supply voltage |
| 引脚 4 | GND — Ground |
| 引脚 5 | OUT3 — H-bridge 2 output |
| 引脚 6 | OUT4 — H-bridge 2 output |
| 引脚 7 | VCC — Logic supply voltage |
| 引脚 8 | GND — Ground |
| 引脚 9 | SCK — SPI clock |
| 引脚 10 | SDI — SPI data input |
| 引脚 11 | SDO — SPI data output |
| 引脚 12 | CS — SPI chip select |
| 引脚 13 | EN — Enable pin |
| 引脚 14 | GND — Ground |
典型应用
L9976 适用于 6 应用s: Power Window Lift, Mirror Adjustment, HVAC Actuator, Seat Positioning, Stepper Motor Control, Industrial Automation.
Power Window Lift
The L9976 drives the DC motor for power window lifts, providing bidirectional control and protection. Its 1.2A continuous current capability handles typical window motor loads, while the SPI interface enables diagnostics for fault detection. The wide supply voltage range (5.5V-36V) accommodates both 12V and 24V systems, and the low RDS(on) minimizes power loss. In a typical application, the L9976 is connected between the body control module (BCM) and the window motor, with the SPI bus used for command and status reporting. The device's overcurrent protection prevents damage during motor stall conditions, and the overtemperature protection ensures safe operation in hot cabin environments.
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Mirror Adjustment
The L9976 is used to control the small DC motors that adjust side mirrors. Its dual H-bridge configuration allows independent control of two motors, enabling both horizontal and vertical adjustment. The low quiescent current (10 uA) in standby mode is beneficial for reducing battery drain when the vehicle is off. The SPI interface allows the mirror control module to read fault status and adjust motor speed via PWM. The device's small footprint and thermal performance make it suitable for integration into the mirror housing. In a typical application, the L9976 is placed on the mirror control PCB, with the SPI bus connected to the body control module. The overcurrent protection prevents damage if the mirror is manually forced, and the undervoltage protection ensures reliable operation during cold cranking.
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HVAC Actuator
The L9976 drives the DC motors used in HVAC actuators for air distribution and temperature control. Its 1.2A continuous current rating is sufficient for typical actuator loads, and the SPI interface enables precise control and diagnostics. The wide supply voltage range ensures compatibility with both 12V and 24V HVAC systems. The device's protection features, including overcurrent and overtemperature, enhance reliability in the harsh under-dash environment. In a typical application, the L9976 is connected to the HVAC control module, which sends commands via SPI to position the actuator. The low RDS(on) reduces heat generation, and the thermal pad of the PowerSO-28 package helps dissipate heat. The device's AEC-Q100 qualification ensures long-term reliability in automotive applications.
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Seat Positioning
The L9976 is used to control the DC motors that adjust seat position, including forward/backward and recline functions. Its dual H-bridge configuration allows independent control of two motors, enabling multi-axis adjustment. The device's high output current (1.2A continuous, 2A peak) handles the inrush current of seat motors, and the SPI interface provides diagnostics for fault detection. The wide supply voltage range (5.5V-36V) supports both 12V and 24V seat systems. In a typical application, the L9976 is integrated into the seat control module, with the SPI bus connected to the body control module. The overcurrent protection prevents damage during motor stall, and the overtemperature protection ensures safe operation during prolonged use. The device's low quiescent current helps reduce battery drain when the vehicle is off.
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Stepper Motor Control
The L9976 can drive a bipolar stepper motor by using its two H-bridges in a full-step or half-step configuration. This is useful for applications such as instrument cluster gauges or headlamp leveling. The SPI interface allows the microcontroller to control the step sequence and read fault status. The device's output current capability (1.2A continuous) is sufficient for most automotive stepper motors. In a typical application, the L9976 is connected to the stepper motor windings, with the SPI bus providing step commands. The device's protection features ensure reliable operation, and the wide supply voltage range accommodates various automotive power systems. The low RDS(on) minimizes power dissipation, and the thermal pad helps manage heat in enclosed spaces.
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Industrial Automation
Although designed for automotive, the L9976 can be used in industrial automation for controlling small DC motors in actuators, valves, and pumps. Its wide supply voltage range (5.5V-36V) and robust protection features make it suitable for 24V industrial systems. The SPI interface allows integration with industrial controllers, and the device's AEC-Q100 qualification ensures high reliability. In a typical application, the L9976 is mounted on a control PCB and connected to a PLC or microcontroller via SPI. The device's overcurrent and overtemperature protection prevent damage in harsh industrial environments. The low RDS(on) reduces power loss, and the PowerSO-28 package provides adequate thermal performance for moderate power levels.
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推荐产品汇总
工程参考数据： L9976 ——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 | L9976A | L9958 | DRV8876 |
|---|---|---|---|---|
| Package | PowerSO-28 | PowerSO-28 (same) | PowerSO-20 (different) | HTSSOP-16 (different) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Supply Voltage Range | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 4.5V to 37V |
| Output Current (Continuous) | 1.2A per channel | 1.2A per channel | 0.6A per channel | 3.5A peak |
| RDS(on) | 0.5 ohm | 0.5 ohm | 0.8 ohm | 0.5 ohm |
| Control Interface | SPI | SPI | SPI | PWM |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
| Quiescent Current (Standby) | 10 uA | 10 uA | 10 uA | 1 uA |
关键差异点
- Higher output current than L9958 （对比 L9958)
- SPI interface for diagnostics （对比 DRV8876)
- Wide supply voltage range （对比 DRV8876)
设计说明
The L9976 in PowerSO-28 package has a thermal resistance of 35 C/W. At 1.2A per channel with RDS(on) of 0.5 ohm, each channel dissipates approximately 0.72W, totaling 1.44W for both channels. This results in a temperature rise of about 50C above ambient. Ensure adequate PCB copper area (at least 2 square inches) and consider a thermal via array under the exposed pad to keep the junction temperature below 150C.
Place a 100nF ceramic capacitor close to the VS and VCC pins to suppress switching noise. Use a 10uF electrolytic capacitor on the VS pin for bulk decoupling. The SPI lines (SCK, SDI, SDO, CS) should be kept short and routed away from high-current motor traces to avoid noise coupling. Reference the STMicroelectronics L9976 datasheet for recommended layout guidelines.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI interface is properly initialized before enabling the outputs. The EN pin must be pulled high to enable the device; leaving it floating may cause unpredictable behavior. Also, note that the L9976 does not have built-in current sensing; use external sense resistors if current monitoring is required.
合规信息
AEC-Q100 qualified per STMicroelectronics datasheet. RoHS compliant. REACH compliance assumed based on STMicroelectronics policy.
