L9974 - Automotive Dual H-Bridge Driver | STMicroelectronics
MPN: L9974 ✓ NakahandaL9974 Ulas
A dual H-bridge driver is a power management IC that controls the direction and speed of DC motors by selectively switching four transistors per bridge. It sits within the motor driver hierarchy: dual H-bridge driver -> motor driver -> power management IC -> semiconductor. This architecture allows bidirectional current flow through the motor, enabling forward, reverse, and braking operations. The L9974 is specifically optimized for automotive environments, meeting AEC-Q100 Grade 1 requirements for operation from -40°C to +150°C.
Key features include a low quiescent current of 50 µA in standby mode, SPI interface for diagnostics and control, and integrated protection features such as overcurrent, overtemperature, and undervoltage lockout. The device also provides a current sense output for closed-loop motor control, enabling precise torque and speed regulation. The SPI interface allows real-time monitoring of fault conditions and configuration of the driver parameters, making it suitable for advanced automotive body control modules.
The L9974 utilizes a smart power technology that combines CMOS control logic with high-voltage power MOSFETs on a single die. This integration reduces external component count and improves reliability. The PowerSO-20 package offers a thermal resistance of 35°C/W, allowing efficient heat dissipation in high-current applications. The device is designed to withstand load dump and reverse battery conditions, ensuring robust operation in harsh automotive environments.
Typical applications include automotive HVAC actuators, headlamp leveling, mirror adjustment, and seat positioning systems. The dual H-bridge configuration allows independent control of two motors, reducing board space and system cost. The SPI interface simplifies wiring and enables advanced diagnostic features required by modern vehicle architectures.
When designing with the L9974, ensure proper PCB layout with adequate copper area for thermal management. The exposed pad must be soldered to a thermal via array to achieve the specified thermal performance. Additionally, place a 100 nF ceramic capacitor close to each supply pin to suppress high-frequency noise and ensure stable operation.
Mga alternatibo na pwedeng ilagay na L9974 — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
L9974A
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
L9942
⚡ Parehong Package ⚠️ Mga Talaan Hindi NaiwerikmoMagkontak para sa presyo
Tingnan ang Datasheet →DRV8801
⚡ Parehong Package ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
L9974 Mga Pinakamataas na Rating at Electrical Characteristics
| 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 |
| Quiescent Current (Standby) | 50 µA |
| Hanay ng Temperature na Operasyon | -40°C to +150°C |
| Packhaging | PowerSO-20 |
| Uri ng Pagpapasok | Surface Mount |
| Thermal Resistance, Junction-to-Ambient | 35 °C/W |
| Proteksyon Laban sa Higit na Kuryente | Yes |
| Overtemperature Protection | Yes |
| Undervoltage Lockout | Yes |
| Current Sense Output | Yes |
| AEC-Q100 Grade | Grade 1 |
| Tindminan RoHS | Compliant |
Pin Configuration ng L9974
| Pin 1 | OUT1 — Motor output 1 |
| Pin 2 | OUT2 — Motor output 2 |
| Pin 3 | VS — Supply voltage |
| Pin 4 | GND — Ground |
| Pin 5 | OUT3 — Motor output 3 |
| Pin 6 | OUT4 — Motor output 4 |
| Pin 7 | CS — Current sense output |
| Pin 8 | SCK — SPI clock |
| Pin 9 | SDI — SPI data input |
| Pin 10 | SDO — SPI data output |
| Pin 11 | CSN — SPI chip select (active low) |
| Pin 12 | RST — Reset (active low) |
| Pin 13 | IN1 — Control input 1 |
| Pin 14 | IN2 — Control input 2 |
| Pin 15 | IN3 — Control input 3 |
| Pin 16 | IN4 — Control input 4 |
| Pin 17 | VDD — Logic supply voltage |
| Pin 18 | GND — Ground |
| Pin 19 | VS — Supply voltage |
| Pin 20 | GND — Ground |
Tipikal na mga Gamit
L9974 ay nararapat para sa 6 aplikasyons: Automotive HVAC Actuators, Headlamp Leveling Systems, Mirror Adjustment, Seat Positioning Systems, Industrial Automation, Robotics.
Automotive HVAC Actuators
The L9974 drives the DC motors used in HVAC flap actuators, providing precise control of air flow direction and temperature. Its dual H-bridge allows independent control of two actuators, reducing component count. The SPI interface enables diagnostic feedback for fault detection, and the wide supply voltage range accommodates battery voltage variations. The low quiescent current is beneficial for always-on systems. The device's thermal performance ensures reliable operation in the high-temperature environment near the HVAC unit.
Inirekomenda
Headlamp Leveling Systems
The L9974 controls the stepper motors used in headlamp leveling systems, ensuring proper beam alignment. Its dual H-bridge can drive a bipolar stepper motor with precise current control via SPI. The device's automotive qualification and wide temperature range make it suitable for under-hood mounting. The current sense output allows closed-loop control for accurate positioning. The robust protection features prevent damage from motor faults.
Inirekomenda
Mirror Adjustment
The L9974 drives the DC motors for electric mirror adjustment, providing smooth and precise movement. Its dual H-bridge allows independent control of horizontal and vertical motors. The SPI interface enables simple control and diagnostics. The low standby current is ideal for applications that are frequently in standby. The device's small footprint and thermal efficiency are advantageous for space-constrained mirror modules.
Inirekomenda
Seat Positioning Systems
The L9974 drives the multiple DC motors used in seat positioning, enabling adjustments for comfort and safety. Its dual H-bridge can control two motors simultaneously, reducing the number of drivers needed. The SPI interface allows coordination of multiple motors and diagnostic monitoring. The high peak current capability supports motor startup. The device's automotive grade ensures reliability in the demanding environment of a vehicle seat.
Inirekomenda
Industrial Automation
The L9974 can be used in industrial automation for controlling small DC motors in valves, pumps, and actuators. Its wide supply voltage range and robust protection features make it suitable for industrial environments. The SPI interface allows integration with PLCs and industrial networks. The device's thermal performance enables continuous operation in high-temperature settings. The dual H-bridge configuration is ideal for applications requiring bidirectional control.
Inirekomenda
Robotics
The L9974 drives the DC motors in small robots, providing precise speed and direction control. Its dual H-bridge allows control of two motors for differential drive. The SPI interface enables high-speed communication with the robot's controller. The low quiescent current is beneficial for battery-powered robots. The device's compact package and thermal efficiency are ideal for space-constrained robot designs.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for L9974 — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | L9974A | L9942 | DRV8801 |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Number of H-Bridges | 2 | 2 | 1 | 1 |
| Supply Voltage Range | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 8V to 36V |
| Output Current (Continuous) | 1.2A per channel | 1.2A per channel | 1.2A | 1.5A |
| Control Interface | SPI | SPI | SPI | PWM |
| Quiescent Current (Standby) | 50 µA | 50 µA | 50 µA | 1 mA |
| AEC-Q100 Grade | Grade 1 | Grade 1 | Grade 1 | Not qualified |
Pangunahing mga Pagkakaiba
- Dual H-bridge in a single package (kumpara saL9942)
- SPI interface for diagnostics (kumpara saDRV8801)
- AEC-Q100 Grade 1 qualification (kumpara saDRV8801)
Talaan ng Disenyo
The PowerSO-20 package has a thermal resistance of 35°C/W. For continuous operation at 1.2A per channel with a 12V supply and 6V motor voltage, power dissipation is approximately 7.2W. Ensure adequate PCB copper area and thermal vias under the exposed pad to keep junction temperature below 150°C.
Place a 100 nF ceramic capacitor close to each VS pin and a 10 µF electrolytic capacitor at the main supply input. The exposed pad must be soldered to a thermal via array for optimal heat transfer. Keep SPI traces short and shielded to minimize noise.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the logic supply (VDD) is within the specified range to avoid undervoltage lockout. The current sense output should be connected to an ADC with appropriate scaling to avoid saturation.
Impormasyon ng Pagsunod sa Kautusan
RoHS compliant per STMicroelectronics product page. AEC-Q100 Grade 1 qualified.