L9973 - Dual H-Bridge Motor Driver | STMicroelectronics | Automotive
料号： L9973 ✓ 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 |
L9973 概述
A motor driver is an integrated circuit that translates low-power control signals from a microcontroller into the higher voltage and current needed to drive an electric motor. In the system hierarchy, a motor driver sits between the logic-level controller and the motor itself, providing the necessary power amplification, protection, and control features. The L9973 belongs to the category of power management ICs, specifically motor drivers, which are essential in automotive body control modules, HVAC systems, and industrial automation.
Key features of the L9973 include a wide operating voltage range, low quiescent current, and integrated protection features such as overcurrent, overtemperature, and undervoltage lockout. The device also features a serial peripheral interface (SPI) for advanced diagnostics and control, allowing the microcontroller to read fault status and configure the driver. The package is a PowerSO-20, which provides excellent thermal performance for high-current applications.
The L9973 uses a standard H-bridge topology with four power MOSFETs per channel, enabling bidirectional motor control. The SPI interface allows for daisy-chaining multiple devices, simplifying PCB layout in multi-motor systems. The device is designed to meet automotive quality standards, including AEC-Q100 qualification, ensuring reliable operation in harsh environments.
Typical applications include automotive power windows, seat adjustment, mirror control, and HVAC flap control. The wide voltage range and robust protection make it ideal for industrial actuators and robotics as well. The SPI interface provides real-time diagnostics, which is critical for safety-critical applications.
When designing with the L9973, ensure proper PCB layout with adequate copper area for heat dissipation, especially when driving high currents. The SPI lines should be kept short and shielded to avoid noise, and the supply pins should be decoupled with a 100nF ceramic capacitor close to the device.
直接替换替代料： L9973 ——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： L9973 （相同外形与封装尺寸） ——差异在于 Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
L9973D
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9973 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 |
| Number of H-Bridges | 2 |
| Control Interface | SPI |
| 过流保护 | Yes |
| Overtemperature Protection | Yes |
| Undervoltage Lockout | Yes |
| 封装 | PowerSO-20 |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40C to +150C |
| AEC-Q100 Qualified | Yes |
| RoHS Compliant | Yes |
L9973 引脚配置
| 引脚 1 | OUT1 — Motor output 1 |
| 引脚 2 | OUT2 — Motor output 2 |
| 引脚 3 | GND — Ground |
| 引脚 4 | VS — Supply voltage |
| 引脚 5 | OUT3 — Motor output 3 |
| 引脚 6 | OUT4 — Motor output 4 |
| 引脚 7 | GND — Ground |
| 引脚 8 | VS — Supply voltage |
| 引脚 9 | SCK — SPI clock |
| 引脚 10 | SDI — SPI data input |
| 引脚 11 | SDO — SPI data output |
| 引脚 12 | CS — Chip select |
| 引脚 13 | EN — Enable |
| 引脚 14 | GND — Ground |
| 引脚 15 | VS — Supply voltage |
| 引脚 16 | OUT5 — Motor output 5 |
| 引脚 17 | OUT6 — Motor output 6 |
| 引脚 18 | GND — Ground |
| 引脚 19 | VS — Supply voltage |
| 引脚 20 | OUT7 — Motor output 7 |
典型应用
L9973 适用于 6 应用s: Automotive Power Windows, Seat Adjustment Systems, HVAC Flap Control, Industrial Actuators, Robotics, Medical Equipment.
Automotive Power Windows
The L9973 drives the window lift motor with bidirectional control and SPI diagnostics. Its 1.2A continuous current is sufficient for most window motors, and the wide voltage range handles load dump transients. The SPI interface allows the body control module to monitor motor current and detect obstructions, enhancing safety.
推荐
Seat Adjustment Systems
The L9973 controls multiple seat motors for position adjustment. Its dual H-bridge configuration allows driving two motors independently, and the SPI interface enables precise control and diagnostics. The device's thermal protection ensures reliable operation during prolonged use.
推荐
HVAC Flap Control
The L9973 drives the flaps in automotive HVAC systems, providing precise positioning with its H-bridge outputs. The SPI interface allows the climate control unit to read flap position and adjust airflow. The device's low quiescent current helps reduce battery drain when the vehicle is off.
推荐
Industrial Actuators
The L9973 is used in industrial actuators for valve control and positioning. Its wide supply voltage range (5.5V to 36V) accommodates various industrial power rails, and the SPI interface provides diagnostics for predictive maintenance. The device's robust protection features ensure reliable operation in harsh environments.
推荐
Robotics
The L9973 drives small DC motors in robotics applications, such as wheel drive and arm joints. Its dual H-bridge allows independent control of two motors, and the SPI interface enables real-time current monitoring for obstacle detection. The compact PowerSO-20 package is ideal for space-constrained robot designs.
推荐
Medical Equipment
The L9973 is used in medical equipment such as infusion pumps and patient positioning systems. Its low noise and precise control are essential for medical applications, and the SPI interface allows for accurate motor speed and position control. The device's AEC-Q100 qualification ensures high reliability, which is critical in medical environments.
推荐
推荐产品汇总
工程参考数据： L9973 ——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 | L9973D | L9958 | DRV8842 |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 (exposed pad) | PowerSO-36 | HTSSOP-28 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Supply Voltage Range | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 8V to 45V |
| Continuous Output Current per Channel | 1.2A | 1.2A | 8.5A | 2.5A |
| Peak Output Current per Channel | 2A | 2A | 13A | 4.5A |
| Control Interface | SPI | SPI | SPI | PWM |
| AEC-Q100 Qualified | Yes | Yes | Yes | No |
| Price (1 unit) | $4.50 | $4.50 | $6.00 | $3.50 |
关键差异点
- SPI interface for diagnostics （对比 DRV8842)
- AEC-Q100 qualification （对比 DRV8842)
- Wide supply voltage range （对比 L9958)
设计说明
The L9973 in PowerSO-20 package can dissipate up to 2W without a heatsink, but for continuous operation at 1.2A per channel, ensure adequate copper area on the PCB. Use a thermal pad connected to the exposed pad (if available) and provide vias to the ground plane for heat spreading.
Place a 100nF ceramic capacitor close to each VS pin and a 10uF electrolytic capacitor at the power input. Keep the SPI lines short and route them away from high-current traces to avoid noise. Use a ground plane to minimize EMI.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI lines are properly terminated to avoid ringing. When driving inductive loads, add freewheeling diodes across the motor terminals to protect the H-bridge from back-EMF.
合规信息
AEC-Q100 qualified per STMicroelectronics product page. RoHS compliant.