L9971 - Automotive Dual H-Bridge Driver | STMicroelectronics
N.º de pieza: L9971 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 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 |
L9971 Descripción general
A dual H-bridge driver is a power management IC that contains two full H-bridge circuits, each capable of driving a DC motor in both directions (forward and reverse) and providing braking. It is a type of motor driver, which falls under the broader category of power management ICs. The L9971 integrates the power stage, control logic, and protection features, simplifying the design of motor control systems.
Key features of the L9971 include a low quiescent current in standby mode, making it suitable for battery-powered automotive applications. It provides overcurrent, overtemperature, and short-circuit protection, ensuring robust operation in harsh environments. The device also features a serial peripheral interface (SPI) for advanced control and diagnostics, allowing the microcontroller to monitor and configure the driver in real time.
The L9971 uses a smart power technology that combines bipolar CMOS and DMOS (BCD) processes, enabling high-current driving capability with low power dissipation. The integrated protection and diagnostic features reduce the need for external components, lowering the overall system cost and improving reliability. The device is designed to meet automotive quality standards, including AEC-Q100 qualification, ensuring reliable operation over the automotive temperature range of -40°C to +150°C.
Typical applications include automotive power windows, sunroofs, seat adjustment, and other DC motor control systems. The L9971 is also suitable for industrial automation, robotics, and other applications requiring bidirectional control of DC motors. Its wide supply voltage range and robust protection make it a versatile choice for various motor control designs.
When designing with the L9971, ensure proper PCB layout to minimize parasitic inductance and provide adequate thermal management. The PowerSO-20 package has an exposed pad that should be soldered to a large copper area for heat dissipation. Additionally, place decoupling capacitors close to the supply pins to reduce voltage spikes during switching.
Alternativas directas para L9971 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con L9971 (mismo factor de forma y huella) — difiere en Protection Features, Output Type, Package, Technology.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
L9958
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$6.2 / unidad
Ver hoja de datos →DRV8876
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
VNH5019
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$5.44 / unidad
Ver hoja de datos →L9971 Valores máximos y características eléctricas
| Supply Voltage Range | 5.5 V to 36 V |
| Output Current (per channel) | 1.2 A (DC) |
| Number of H-Bridges | 2 |
| Control Interface | SPI |
| Standby Current | 10 uA (typ) |
| Rango de temperatura de funcionamiento | -40°C to +150°C |
| Encapsulado | PowerSO-20 |
| Tipo de montaje | Surface Mount |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| Diagnostic Features | SPI fault reporting |
| AEC-Q100 Qualification | Yes |
| Estado RoHS | Compliant |
| Tipo de salida | Dual H-Bridge |
Configuración de pines de L9971
| Pin 1 | OUT1 — H-Bridge 1 output |
| Pin 2 | OUT2 — H-Bridge 1 output |
| Pin 3 | GND — Ground |
| Pin 4 | VS — Supply voltage |
| Pin 5 | OUT3 — H-Bridge 2 output |
| Pin 6 | OUT4 — H-Bridge 2 output |
| Pin 7 | GND — Ground |
| Pin 8 | VS — Supply voltage |
| Pin 9 | SCK — SPI clock |
| Pin 10 | SDI — SPI data input |
| Pin 11 | SDO — SPI data output |
| Pin 12 | CS — SPI chip select |
| Pin 13 | EN — Enable |
| Pin 14 | DIAG — Diagnostic output |
| Pin 15 | GND — Ground |
| Pin 16 | VS — Supply voltage |
| Pin 17 | OUT5 — H-Bridge 2 output |
| Pin 18 | OUT6 — H-Bridge 2 output |
| Pin 19 | GND — Ground |
| Pin 20 | VS — Supply voltage |
Aplicaciones típicas
L9971 es adecuado para 6 aplicacións: Automotive Power Windows, Sunroof Control, Seat Adjustment, Industrial Automation, Robotics, Medical Equipment.
Automotive Power Windows
The L9971 drives the DC motor for power windows, providing bidirectional control and protection. Its 1.2A output current is sufficient for window lift motors, and the SPI interface allows precise control and diagnostics. The wide supply voltage range (5.5V to 36V) accommodates automotive battery voltage variations. The low standby current (10 uA) minimizes battery drain when the window is not in use. The AEC-Q100 qualification ensures reliable operation in the harsh automotive environment, with overcurrent and overtemperature protection preventing damage during jamming or overload conditions.
Recomendado
Sunroof Control
The L9971 is used to control the sunroof motor, providing forward and reverse operation. Its dual H-bridge configuration allows independent control of two motors if needed. The SPI interface enables the microcontroller to monitor motor current and detect obstacles, enhancing safety. The device's thermal protection ensures reliable operation even during prolonged use. The PowerSO-20 package with exposed pad aids in heat dissipation, making it suitable for the confined space of a sunroof module.
Recomendado
Seat Adjustment
The L9971 drives the seat adjustment motors for forward/backward and recline functions. Its 1.2A output current is adequate for small seat motors. The SPI interface allows the system to read fault status and adjust motor speed via PWM. The wide operating temperature range (-40°C to +150°C) ensures operation in extreme climates. The device's short-circuit protection prevents damage to the motor and wiring in case of a fault.
Recomendado
Industrial Automation
In industrial automation, the L9971 can be used to control small DC motors in conveyor belts, actuators, and robotic arms. Its robust protection features and SPI diagnostics make it suitable for industrial environments. The wide supply voltage range allows operation from 24V industrial supplies. The device's low standby current is beneficial for energy-efficient systems. The PowerSO-20 package is easy to solder and provides good thermal performance.
Recomendado
Robotics
The L9971 is used in robotics for driving DC motors in wheels, arms, and grippers. Its dual H-bridge allows control of two motors independently, enabling differential drive. The SPI interface provides real-time diagnostics, which is crucial for autonomous systems. The device's overcurrent protection prevents motor burnout in stall conditions. The compact PowerSO-20 package is ideal for space-constrained robot designs.
Recomendado
Medical Equipment
The L9971 can be used in medical equipment such as hospital beds, infusion pumps, and diagnostic devices that require precise motor control. Its low standby current and high reliability make it suitable for battery-powered medical devices. The SPI interface allows for accurate speed and position control. The device's protection features ensure safe operation in critical applications. The AEC-Q100 qualification, while automotive-focused, also indicates high reliability suitable for medical use.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para L9971 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | L9958 | DRV8876 | VNH5019 |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments | STMicroelectronics |
| Output Current (per channel) | 1.2 A | 8.5 A | 3.5 A | 30 A |
| Supply Voltage Range | 5.5V to 36V | 5.5V to 36V | 4.5V to 36V | 5.5V to 36V |
| Control Interface | SPI | SPI | PWM | PWM |
| Standby Current | 10 uA | 5 uA | 1 uA | 5 uA |
| AEC-Q100 Qualified | Yes | Yes | No | Yes |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit | Overcurrent, Overtemperature, Short-Circuit | Overcurrent, Overtemperature, Short-Circuit | Overcurrent, Overtemperature, Short-Circuit |
Diferenciadores clave
- SPI control and diagnostics (frente a DRV8876)
- AEC-Q100 qualification (frente a DRV8876)
- Lower output current for cost optimization (frente a L9958)
Notas de diseño
The PowerSO-20 package has an exposed pad that must be soldered to a large copper area on the PCB to ensure adequate heat dissipation. For continuous operation at 1.2A per channel, calculate the power dissipation and ensure the junction temperature stays below 150°C. Use thermal vias to improve heat transfer to the ground plane.
Place 100nF and 10uF decoupling capacitors close to the VS pins to suppress voltage spikes during motor switching. Use a star-ground topology to minimize ground bounce. Keep the SPI lines short and shielded to avoid noise coupling from the motor currents.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the motor's back-EMF is clamped with external flyback diodes if the motor is not internally protected. The SPI interface must be configured correctly to avoid unintended motor activation. Always enable the device after proper initialization.
Información de cumplimiento
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.