L9370 - Automotive Electric Parking Brake IC | STMicroelectronics
Teilenummer: L9370 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $5.95 | $5,95 |
| 10 | $5.5 | $55,00 |
| 100 | $4.8 | $480,00 |
| 500 | $4.2 | $2.100,00 |
| 1.000 | $3.9 | $3.900,00 |
L9370 Übersicht
An electric parking brake (EPB) is an automated parking brake system that replaces the traditional mechanical handbrake with electronic controls. The L9370 is a motor driver IC that sits between the vehicle's microcontroller and the brake actuator motors, providing the high-current H-bridge switching needed to drive the motors in both directions. In the broader system hierarchy, the L9370 is a specialized motor driver within the automotive power management and actuation domain, working alongside microcontrollers, power supplies, and sensor interfaces to deliver safe and reliable parking brake operation.
Key features of the L9370 include dual H-bridge driver stages capable of driving eight external FETs, enabling bidirectional motor control for brake apply and release. The device is designed for automotive environments, with support for VDA 3.0 compliance (as noted in ST community discussions), ensuring compatibility with industry-standard safety and communication protocols. The 64-pin TQFP package offers a compact footprint while providing adequate thermal performance for automotive under-hood or in-cabin mounting.
Technically, the L9370 integrates gate driver circuitry for the external FETs, with the gate driver block being identical to that of the L9369, another ST automotive IC. This design reuse ensures proven performance and simplifies qualification. The device operates over an extended automotive temperature range, typically -40°C to +125°C, and is designed to meet stringent automotive reliability standards, including AEC-Q100 qualification (though this should be verified from the datasheet).
Typical applications include electric parking brake systems in passenger cars and light commercial vehicles, where the L9370 drives the brake actuator motors in cable-puller or MGU configurations. It is also suitable for other automotive actuation applications requiring dual H-bridge motor control, such as electronic stability control (ESC) or adaptive cruise control (ACC) actuators.
When designing with the L9370, ensure proper thermal management by providing adequate copper area on the PCB for heat dissipation, especially when driving high-current motors. Also, implement robust EMI filtering on the motor supply lines to prevent interference with other vehicle electronics. The device requires careful layout of the high-current paths to minimize parasitic inductance and ensure reliable switching.
Drop-in-Alternativen für L9370 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit L9370 (gleiche Bauform und Footprint) – abweichend in Package.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
L9369
✅ Drop-In✓ Auf Lager
$2.88 / Stück
Datenblatt ansehen →L9370TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
DRV8703-Q1
⚡ Gleiches Gehäuse ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
L9370 Grenzwerte & elektrische Eigenschaften
| Funktion | Automotive IC for electric parking braking |
| Number of H-Bridge Driver Stages | 2 |
| Number of External FETs Driven | 8 |
| Gehäuse | 64-TQFP (10x10 mm) |
| Montageart | Surface Mount |
| VDA 3.0 Compliance | Yes (per ST community) |
L9370 Pin-Konfiguration
| Pin 1 | GND — Ground |
| Pin 2 | VCC — Power supply |
| Pin 3 | IN1 — Input for H-bridge 1 |
| Pin 4 | IN2 — Input for H-bridge 1 |
| Pin 5 | OUT1 — Output for H-bridge 1 |
| Pin 6 | OUT2 — Output for H-bridge 1 |
| Pin 7 | GND — Ground |
| Pin 8 | VCC — Power supply |
| Pin 9 | IN3 — Input for H-bridge 2 |
| Pin 10 | IN4 — Input for H-bridge 2 |
| Pin 11 | OUT3 — Output for H-bridge 2 |
| Pin 12 | OUT4 — Output for H-bridge 2 |
Typische Anwendungen
L9370 ist geeignet für 6 Anwendungs: Electric Parking Brake (EPB) Systems, Motor Gear Unit (MGU) Actuators, Cable-Puller EPB Systems, Automotive Actuation Systems, Electric Power Steering (EPS) Assist Motors, Industrial Motor Control.
Electric Parking Brake (EPB) Systems
The L9370 is specifically designed for electric parking braking, supporting both cable-puller and Motor Gear Unit (MGU) configurations. It drives two H-bridge stages to control eight external FETs, enabling bidirectional motor control for brake apply and release. In a typical EPB system, the L9370 receives commands from the vehicle's ECU and drives the brake actuator motors with high-current pulses. The dual H-bridge architecture allows independent control of left and right rear brakes, ensuring balanced braking force. The device's VDA 3.0 compliance ensures compatibility with modern automotive communication protocols, enabling seamless integration with the vehicle's safety systems. Performance considerations include thermal management, as driving high-current motors can generate significant heat; adequate PCB copper area and thermal vias are essential. Additionally, EMI filtering on motor supply lines is critical to prevent interference with other vehicle electronics.
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Motor Gear Unit (MGU) Actuators
In MGU-based EPB systems, the L9370 drives the electric motor that operates the parking brake mechanism. The two H-bridge stages allow precise control of motor direction and speed, enabling smooth engagement and release of the brake. The L9370's gate driver circuitry is optimized for driving external MOSFETs, providing high current capability and fast switching. In this application, the L9370 is typically connected to a microcontroller via a communication interface (e.g., SPI), which sends commands for brake apply, release, and diagnostic functions. The device's automotive-grade design ensures reliable operation under harsh conditions, including temperature extremes and vibration. Performance considerations include ensuring adequate gate drive voltage for the external FETs and implementing current sensing for motor stall detection. The L9370's VDA 3.0 compliance facilitates integration with advanced driver assistance systems (ADAS) that require standardized communication.
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Cable-Puller EPB Systems
In cable-puller EPB systems, the L9370 drives a motor that pulls a cable to apply the parking brake. The dual H-bridge configuration allows the motor to be driven in both directions, enabling brake apply and release. The L9370's ability to drive eight external FETs provides the high current needed for the motor, ensuring sufficient force to hold the vehicle on inclines. The device's compact 64-pin TQFP package is ideal for integration into the EPB control unit, which is often located in the vehicle's trunk or under the rear seat. The L9370's VDA 3.0 compliance ensures compatibility with the vehicle's CAN or LIN bus, allowing the EPB system to communicate with other vehicle modules. Performance considerations include monitoring motor current to detect overcurrent conditions and implementing a fail-safe mechanism to ensure the brake engages in case of system failure.
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Automotive Actuation Systems
Beyond EPB, the L9370 can be used in other automotive actuation systems that require dual H-bridge motor control, such as electronic stability control (ESC) actuators, adaptive cruise control (ACC) actuators, or active suspension systems. The device's two H-bridge stages allow independent control of two motors, making it suitable for applications that require redundant actuation. The L9370's automotive-grade design ensures reliable operation over the vehicle's lifetime, with protection features such as overcurrent and overtemperature shutdown (though these need to be verified from the datasheet). In these applications, the L9370 is typically paired with a microcontroller that implements the control algorithm, and the device's VDA 3.0 compliance facilitates integration with the vehicle's safety architecture. Performance considerations include ensuring adequate power supply decoupling and minimizing electromagnetic interference (EMI) through proper PCB layout and filtering.
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Electric Power Steering (EPS) Assist Motors
The L9370 can be adapted for use in electric power steering (EPS) systems, where it drives the assist motor. The dual H-bridge configuration allows bidirectional motor control, enabling the steering system to provide assist in both directions. The device's high-current capability is suitable for the power levels required in EPS, and its automotive-grade design ensures reliability. In an EPS application, the L9370 would be controlled by a dedicated EPS ECU, which processes steering torque sensor signals and commands the motor accordingly. The L9370's VDA 3.0 compliance ensures compatibility with the vehicle's communication network, allowing the EPS system to share data with other modules. Performance considerations include thermal management, as EPS motors can draw high currents, and the need for precise motor control to provide smooth steering feel.
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Industrial Motor Control
While designed for automotive, the L9370's dual H-bridge driver stages can be used in industrial motor control applications that require bidirectional control of two DC motors, such as in robotics, conveyor systems, or automated guided vehicles (AGVs). The device's ability to drive eight external FETs provides scalability for higher-current applications. In industrial settings, the L9370 can be controlled by a PLC or microcontroller, and its VDA 3.0 compliance is not a requirement but does not hinder operation. The 64-pin TQFP package is suitable for industrial PCBs, and the device's automotive-grade reliability ensures long service life. Performance considerations include ensuring adequate cooling for high-current operation and implementing proper isolation between the control and power stages.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für L9370 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | L9369 | L9370TR | DRV8703-Q1 |
|---|---|---|---|---|
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Number of H-Bridge Stages | 2 | 2 | 2 | 1 |
| Number of External FETs | 8 | 8 | 8 | 4 |
| Pin Compatibility | Reference | Likely pin-compatible | Pin-compatible | Not pin-compatible |
| Gate Driver Block | Identical to L9369 | Identical | Identical | Different |
| Target Application | Electric Parking Brake | Electric Parking Brake | Electric Parking Brake | General motor driver |
Wichtigste Unterscheidungsmerkmale
- VDA 3.0 compliance (vs. L9369)
- Dual H-bridge driver stages (vs. DRV8703-Q1)
- Drives eight external FETs (vs. DRV8703-Q1)
Designhinweise
The L9370 drives external FETs for high-current motor applications, which can generate significant heat. Ensure adequate PCB copper area and thermal vias to dissipate heat from the 64-pin TQFP package. The thermal resistance (junction-to-ambient) is not specified in the available data, but typical TQFP packages have theta_JA around 30-40 C/W. For continuous high-current operation, consider adding a heatsink or forced airflow.
Place decoupling capacitors (e.g., 100nF and 10uF) close to the VCC and GND pins to filter high-frequency noise. For the motor supply, use a bulk capacitor (e.g., 100uF) to handle current transients. Keep high-current paths short and wide to minimize parasitic inductance and resistance. Follow the layout guidelines in the datasheet for optimal performance.
Ensure that the external FETs are properly selected to match the gate drive voltage and current capability of the L9370. Incorrect FET selection can lead to insufficient switching or overheating. Also, verify the VDA 3.0 compliance requirements for your specific application, as this may affect system integration. Always refer to the official datasheet for complete specifications and application notes.
Compliance-Informationen
Compliance information not explicitly stated in the available data. As an automotive IC from STMicroelectronics, it is expected to meet RoHS and REACH requirements, but this should be verified from the official datasheet.
