Overview
The L9904 is a motor bridge controller integrated circuit (IC) designed by STMicroelectronics for automotive applications. It is specifically tailored to control four external N-channel MOS transistors in an H-Bridge configuration for DC motor driving. The IC includes an ISO 9141 compatible interface, making it suitable for various automotive systems that require robust and reliable motor control.
The L9904 offers a range of features that enhance its performance and reliability, including programmable cross conduction protection time, PWM operation frequency up to 30 kHz, and real-time diagnostic capabilities. It also features overvoltage, undervoltage, short circuit, and thermal protection, ensuring safe and efficient operation under various conditions.
Key Specifications
| Parameter | Description | Value | Unit |
|---|---|---|---|
| Operating Supply Voltage | Typical operating range | 8V to 28V | V |
| Overvoltage Maximum | Maximum overvoltage threshold | 40V | V |
| Quiescent Current in Standby Mode | Current consumption in standby | < 50µA | µA |
| PWM Operation Frequency | Maximum PWM frequency | Up to 30 kHz | kHz |
| Package | Package type | SO-20 | - |
| Grade | Automotive grade | Automotive | - |
| RoHS Compliance Grade | RoHS compliance status | Ecopack1 (*) | - |
| Operating Temperature Range | Temperature range for operation | -40°C to 150°C | °C |
Key Features
- Programmable Cross Conduction Protection Time: Allows for adjustable protection against cross conduction.
- PWM Operation Frequency Up to 30 kHz: Supports high-frequency PWM operations for precise motor control.
- Real-Time Diagnostic: Provides real-time diagnostic capabilities for monitoring and troubleshooting.
- Operating Supply Voltage 8V to 28V: Operates within a wide voltage range with overvoltage protection up to 40V.
- Quiescent Current in Standby Mode Less Than 50µA: Low power consumption in standby mode.
- ISO 9141 Compatible Interface: Supports communication via the ISO 9141 bus interface.
- Charge Pump for Driving Power MOS: Includes a charge pump for reverse battery protection.
- Overvoltage, Undervoltage, Short Circuit, and Thermal Protection: Comprehensive protection against various fault conditions.
Applications
The L9904 is designed for use in automotive applications, particularly for controlling DC motors in various vehicle systems. Some common applications include:
- Automotive Motor Control: Suitable for controlling motors in automotive systems such as wipers, pumps, and other DC motor-driven components.
- Ignition and Motion Control: Can be used in ignition systems and motion control applications within vehicles.
- Automotive Electronics: Applicable in various electronic systems of vehicles that require robust and reliable motor control.
Q & A
- What is the primary function of the L9904 IC?
The L9904 is a motor bridge controller designed to control four external N-channel MOS transistors in an H-Bridge configuration for DC motor driving in automotive applications.
- What is the operating supply voltage range of the L9904?
The L9904 operates within a supply voltage range of 8V to 28V, with overvoltage protection up to 40V.
- What is the maximum PWM operation frequency of the L9904?
The L9904 supports PWM operation frequencies up to 30 kHz.
- Does the L9904 have built-in diagnostic capabilities?
Yes, the L9904 includes real-time diagnostic features for monitoring and troubleshooting.
- What type of interface does the L9904 support?
The L9904 supports an ISO 9141 compatible interface.
- How does the L9904 protect against fault conditions?
The L9904 includes overvoltage, undervoltage, short circuit, and thermal protection mechanisms.
- What is the quiescent current in standby mode for the L9904?
The quiescent current in standby mode is less than 50µA.
- Can the L9904 operate at lower supply voltages?
Yes, the L9904 can operate with an extended supply voltage range down to 6V using an implemented step-up converter.
- What is the package type of the L9904?
The L9904 is available in an SO-20 package.
- Is the L9904 RoHS compliant?
Yes, the L9904 is RoHS compliant with an Ecopack1 (*) rating.
