L9904 - Automotive 3-Phase Brushless DC Motor Driver | STMicroelectronics
N.º da peça: L9904 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.65 | $76,50 |
| 100 | $6.8 | $680,00 |
| 500 | $6.12 | $3.060,00 |
| 1.000 | $5.44 | $5.440,00 |
L9904 Visão geral
A brushless DC motor driver is a power management IC that controls the commutation of a BLDC motor by sequentially energizing the motor windings. It typically includes gate drivers for the power stage, current sensing, and protection features. In the system hierarchy, a BLDC motor driver sits between the microcontroller (MCU) and the power MOSFETs, translating low-voltage logic signals into high-current gate drive signals. This component is essential in automotive applications such as electric power steering, engine cooling fans, and oil pumps, where precise motor control and reliability are critical.
Key features of the L9904 include a programmable gate drive current, a built-in charge pump for high-side gate drive, and comprehensive protection features such as overcurrent, overvoltage, and thermal shutdown. The device also includes a SPI interface for configuration and diagnostics, allowing the MCU to monitor and control the motor driver in real time. The LQFP-48 package provides a compact footprint while maintaining good thermal performance, with a thermal resistance of 40°C/W.
The L9904 utilizes a smart power technology that integrates analog and digital circuitry on a single chip. The charge pump enables 100% duty cycle operation of the high-side MOSFETs, which is crucial for high-speed motor applications. The SPI interface supports daisy-chaining of multiple devices, simplifying PCB layout in multi-motor systems. The device is AEC-Q100 qualified, ensuring reliability in harsh automotive environments.
Typical applications include electric power steering (EPS), engine cooling fans, fuel pumps, and other automotive BLDC motor control systems. The wide supply voltage range and robust protection features make it ideal for 12V and 24V automotive electrical systems. The SPI interface allows for advanced motor control algorithms, such as field-oriented control (FOC), to be implemented by the MCU.
When designing with the L9904, ensure proper PCB layout to minimize parasitic inductance in the gate drive loops. Use appropriate gate resistors to control switching speed and reduce EMI. The device requires a bootstrap capacitor for the high-side gate drive, which should be placed close to the IC pins. Thermal management is critical; ensure adequate copper area on the PCB to dissipate heat from the LQFP-48 package.
Alternativas drop-in para L9904 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com L9904 (mesmo formato e footprint) — diferindo em Charge Pump, Package, Supply Voltage Range, Function, Gate Drive Current.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
L9903
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
L9904-Q1
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
L9904 Classificações máximas e características elétricas
| Supply Voltage Range | 5.5 V to 40 V |
| Gate Drive Current | 1 A (source/sink) |
| Number of Channels | 3 (triple half-bridge) |
| Charge Pump | Yes (100% duty cycle) |
| Interface | SPI |
| Protection Features | Overcurrent, overvoltage, thermal shutdown |
| Temperatura de operação | -40°C to +150°C |
| Encapsulamento | LQFP-48 (7x7 mm) |
| Tipo de montagem | Surface Mount |
| AEC-Q100 | Qualified |
| RoHS | Compliant |
| Resistência térmica | 40 °C/W |
| Número de pinos | 48 |
Configuração de pinos do L9904
| Pino 1 | VCC — Logic supply voltage |
| Pino 2 | GND — Ground |
| Pino 3 | GATE_A_H — High-side gate drive for phase A |
| Pino 4 | GATE_A_L — Low-side gate drive for phase A |
| Pino 5 | GATE_B_H — High-side gate drive for phase B |
| Pino 6 | GATE_B_L — Low-side gate drive for phase B |
| Pino 7 | GATE_C_H — High-side gate drive for phase C |
| Pino 8 | GATE_C_L — Low-side gate drive for phase C |
| Pino 9 | VS — Power supply for gate drivers |
| Pino 10 | CP — Charge pump capacitor connection |
| Pino 11 | SPI_CS — SPI chip select |
| Pino 12 | SPI_CLK — SPI clock |
| Pino 13 | SPI_MOSI — SPI master out slave in |
| Pino 14 | SPI_MISO — SPI master in slave out |
| Pino 15 | FAULT — Fault output |
| Pino 16 | EN — Enable input |
Aplicações típicas
L9904 é adequado para 6 aplicaçãos: Electric Power Steering (EPS), Engine Cooling Fan, Fuel Pump, Oil Pump, HVAC Blower, Industrial BLDC Motor Control.
Electric Power Steering (EPS)
The L9904 is ideal for EPS systems due to its AEC-Q100 qualification, wide supply voltage range (5.5V to 40V), and high gate drive current (1A). It provides reliable and efficient control of the BLDC motor that assists steering, ensuring smooth and responsive operation. The SPI interface allows the ECU to monitor and adjust motor parameters in real time, enhancing safety and performance. The charge pump enables 100% duty cycle operation, which is essential for high-torque assistance at low speeds. The integrated protection features (overcurrent, overvoltage, thermal shutdown) safeguard the motor driver and MOSFETs in the event of faults, ensuring long-term reliability in automotive environments.
Recomendado
Engine Cooling Fan
The L9904 is well-suited for engine cooling fan applications, where it drives a BLDC motor to regulate airflow. Its wide supply voltage range accommodates the varying battery voltage in automotive systems, and the high gate drive current ensures fast switching of the power MOSFETs, reducing losses. The SPI interface enables precise speed control and diagnostics, allowing the engine control unit (ECU) to adjust fan speed based on coolant temperature. The device's thermal shutdown protection prevents overheating in high-temperature under-hood environments. The compact LQFP-48 package fits into space-constrained fan modules, and the AEC-Q100 qualification ensures reliability over the vehicle's lifetime.
Recomendado
Fuel Pump
The L9904 is used in fuel pump applications to drive a BLDC motor that delivers fuel to the engine. Its robust protection features (overcurrent, overvoltage, thermal shutdown) ensure safe operation in harsh conditions. The wide supply voltage range (5.5V to 40V) supports both 12V and 24V systems, and the SPI interface allows the ECU to monitor motor health and adjust pump speed for optimal fuel delivery. The charge pump enables 100% duty cycle operation, which is necessary for high-speed pumping. The AEC-Q100 qualification guarantees reliability in automotive environments, making the L9904 a trusted choice for fuel pump control.
Recomendado
Oil Pump
The L9904 is suitable for oil pump applications, where it drives a BLDC motor to circulate oil in the engine. Its high gate drive current (1A) enables efficient switching of external MOSFETs, reducing power losses. The SPI interface provides real-time diagnostics, allowing the ECU to detect faults early. The device's wide supply voltage range and AEC-Q100 qualification make it ideal for automotive use. The charge pump ensures 100% duty cycle operation, which is critical for maintaining oil pressure at all engine speeds. The integrated protection features protect the motor and driver from overcurrent and thermal stress, ensuring long-term reliability.
Recomendado
HVAC Blower
The L9904 is used in HVAC blower applications to drive a BLDC motor that controls airflow in the cabin. Its low noise operation and precise speed control, enabled by the SPI interface, provide passenger comfort. The wide supply voltage range (5.5V to 40V) accommodates various vehicle electrical systems, and the high gate drive current ensures efficient motor operation. The device's protection features prevent damage from overcurrent and overvoltage, enhancing system reliability. The compact LQFP-48 package fits into the blower module, and the AEC-Q100 qualification ensures long-term performance in automotive environments.
Recomendado
Industrial BLDC Motor Control
The L9904 can also be used in industrial BLDC motor control applications, such as conveyor belts and pumps, where its wide supply voltage range and robust protection features are beneficial. The SPI interface allows for advanced motor control algorithms, and the high gate drive current ensures efficient switching. The device's thermal shutdown protection prevents overheating in continuous operation. While not specifically designed for industrial use, the L9904's automotive-grade reliability makes it a robust choice for demanding industrial environments. The LQFP-48 package is suitable for PCB designs, and the device can operate from 12V to 24V supplies commonly found in industrial settings.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para L9904 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | L9903 | L9904-Q1 | DRV8301 |
|---|---|---|---|---|
| Package | LQFP-48 | LQFP-48 (same) | LQFP-48 (same) | HTSSOP-56 (different) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
Principais diferenciais
- AEC-Q100 automotive qualification (vs DRV8301)
- Wide supply voltage range up to 40V (vs L9903)
- SPI interface for diagnostics (vs L9903)
Notas de projeto
Place the charge pump capacitor (CP) as close as possible to the CP pin and ground. Use a low-ESR ceramic capacitor (e.g., 100nF) to ensure stable charge pump operation. Keep the gate drive traces short and wide to minimize parasitic inductance and reduce ringing.
The LQFP-48 package has a thermal resistance of 40°C/W. At high ambient temperatures (e.g., 125°C), ensure adequate PCB copper area for heat dissipation. Use thermal vias under the exposed pad (if present) to improve heat transfer to the ground plane. Monitor the junction temperature to avoid thermal shutdown.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI lines are properly terminated to avoid communication errors. Use appropriate gate resistors to control switching speed and reduce EMI. Verify the bootstrap capacitor value for high-side gate drive; a typical value is 100nF, but consult the datasheet for specific requirements.
Informações de conformidade
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in the provided data.
