L9390 - 12-Channel Valve Driver | STMicroelectronics | Automotive
MPN: L9390 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
L9390 Overview
A valve driver is a power management IC that translates low-power logic signals from a microcontroller into high-current, high-voltage drive signals capable of actuating electromechanical valves. In the system hierarchy, the L9390 sits between the engine control unit (ECU) microcontroller and the physical valves, functioning as a power actuator interface. This category of components is essential in automotive electronics, where reliable, high-current switching with built-in diagnostics is critical for safety and performance.
Key features of the L9390 include 12 independent output channels, each capable of driving inductive loads with integrated freewheeling protection. The device supports a wide operating voltage range suitable for 12V and 24V automotive systems, and includes overcurrent, overtemperature, and open-load detection for each channel. The 100-pin eTQFP package provides excellent thermal performance and allows for compact PCB layouts in space-constrained engine control modules.
The L9390 utilizes a robust BCD (Bipolar-CMOS-DMOS) process technology, enabling high-voltage operation with low quiescent current. Each output channel features a DMOS power transistor with low on-resistance, minimizing power dissipation and heat generation. The device includes a serial peripheral interface (SPI) for configuration and diagnostic readback, allowing the ECU to monitor valve health in real time and implement predictive maintenance strategies.
Typical applications include diesel and gasoline engine management systems, where the L9390 drives fuel injectors and EGR valves, and automatic transmission control units, where it actuates hydraulic solenoids for gear selection. The device is also used in industrial automation for controlling pneumatic and hydraulic valves, and in commercial vehicle systems for managing air suspension and braking actuators.
When designing with the L9390, ensure adequate PCB copper area for thermal dissipation, especially when driving multiple channels at high current simultaneously. The SPI interface should be properly configured for the desired diagnostic thresholds, and external flyback diodes or the integrated freewheeling protection should be verified against the specific inductive load characteristics to prevent voltage spikes.
Drop-in alternatives for L9390 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L9301
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9352
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC33879
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9390 Maximum Ratings & Electrical Characteristics
| Number of Channels | 12 |
| Output Type | Low-side driver |
| Package | 100-eTQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Interface | SPI |
| Diagnostics | Overcurrent, overtemperature, open-load |
| Protection Features | Freewheeling, overcurrent, overtemperature |
| RoHS Status | Compliant |
L9390 Pin Configuration
| Pin 1 | OUT1 — Output channel 1 |
| Pin 2 | OUT2 — Output channel 2 |
| Pin 3 | OUT3 — Output channel 3 |
| Pin 4 | OUT4 — Output channel 4 |
| Pin 5 | OUT5 — Output channel 5 |
| Pin 6 | OUT6 — Output channel 6 |
| Pin 7 | OUT7 — Output channel 7 |
| Pin 8 | OUT8 — Output channel 8 |
| Pin 9 | OUT9 — Output channel 9 |
| Pin 10 | OUT10 — Output channel 10 |
| Pin 11 | OUT11 — Output channel 11 |
| Pin 12 | OUT12 — Output channel 12 |
| Pin 13 | GND — Ground |
| Pin 14 | VCC — Power supply |
| Pin 15 | SPI_CS — SPI chip select |
| Pin 16 | SPI_CLK — SPI clock |
| Pin 17 | SPI_MOSI — SPI data input |
| Pin 18 | SPI_MISO — SPI data output |
Typical Applications
L9390 is suitable for 6 applications: Engine Management Systems, Transmission Control Units, Industrial Automation, Commercial Vehicle Systems, Fuel Injection Systems, Hydraulic Valve Control.
Engine Management Systems
The L9390 drives fuel injectors and EGR valves in diesel and gasoline engines. Its 12-channel capability allows simultaneous control of multiple actuators, while SPI diagnostics enable real-time monitoring of valve health. The low-side driver architecture is ideal for switching inductive loads with integrated freewheeling protection, ensuring reliable operation in harsh automotive environments. The wide operating voltage range accommodates 12V and 24V systems, and the 100-pin eTQFP package fits compact ECU designs. Compared to discrete driver solutions, the L9390 reduces component count and PCB area, improving system reliability and reducing assembly cost. The integrated overcurrent and overtemperature protection prevents damage to the IC and connected valves, extending system lifespan. For optimal performance, ensure proper thermal management by providing adequate copper area on the PCB and consider the total power dissipation when driving multiple channels at high current.
Recommended
Transmission Control Units
In automatic transmissions, the L9390 actuates hydraulic solenoids for gear selection and clutch control. The 12-channel output allows precise control of multiple solenoids, enabling smooth gear shifts and improved fuel efficiency. The SPI interface provides diagnostic feedback, allowing the TCU to detect solenoid faults and implement fail-safe strategies. The device's low-side driver topology is well-suited for driving solenoid valves with high inrush currents, and the integrated freewheeling protection clamps inductive kickback voltages, protecting the IC and reducing EMI. The 100-pin eTQFP package is compatible with standard TCU PCB layouts, and the wide operating temperature range ensures reliable operation under extreme conditions. For robust design, place decoupling capacitors close to the power pins and ensure the SPI lines are properly terminated to avoid communication errors. The L9390's diagnostic features enable predictive maintenance, reducing warranty costs and improving vehicle reliability.
Recommended
Industrial Automation
The L9390 is used in industrial automation to control pneumatic and hydraulic valves in manufacturing equipment. Its 12-channel output can drive multiple actuators simultaneously, improving machine throughput and precision. The SPI diagnostics allow PLCs to monitor valve status and detect failures early, reducing downtime. The device's robust protection features, including overcurrent and overtemperature shutdown, ensure safe operation in industrial environments. The 100-pin eTQFP package is suitable for compact control boards, and the wide operating voltage range supports various industrial power supplies. For reliable operation, ensure proper heat sinking and consider the total power dissipation when driving multiple valves. The L9390's low-side driver architecture is compatible with most industrial valve configurations, and the integrated freewheeling protection eliminates the need for external flyback diodes, simplifying the BOM. This makes the L9390 a cost-effective solution for multi-valve control in factory automation.
Recommended
Commercial Vehicle Systems
In commercial vehicles, the L9390 manages air suspension and braking actuators. The 12-channel output allows control of multiple valves for load-leveling and brake modulation, enhancing vehicle stability and safety. The SPI interface provides diagnostic data for fleet management systems, enabling remote monitoring and predictive maintenance. The device's wide operating voltage range supports 24V truck electrical systems, and the robust protection features ensure reliable operation in harsh conditions. The 100-pin eTQFP package is suitable for ruggedized ECUs, and the low-side driver topology is ideal for driving solenoid valves in air systems. For optimal performance, ensure the power supply is stable and properly filtered to avoid voltage spikes. The L9390's integrated diagnostics reduce troubleshooting time and improve vehicle uptime, making it a valuable component for commercial vehicle OEMs.
Recommended
Fuel Injection Systems
The L9390 drives fuel injectors in direct injection engines, providing precise control of fuel delivery for improved combustion efficiency and reduced emissions. The 12-channel output allows individual injector control, enabling advanced injection strategies. The SPI diagnostics monitor injector health, detecting clogging or electrical faults. The device's low-side driver architecture is optimized for high-current injector loads, and the integrated freewheeling protection clamps inductive spikes, ensuring reliable operation. The 100-pin eTQFP package fits compact engine control modules, and the wide operating temperature range supports under-hood environments. For reliable operation, ensure the power supply can handle the peak injector current and provide adequate decoupling. The L9390's diagnostic features enable closed-loop control, improving fuel economy and reducing emissions, making it a key component in modern engine management systems.
Recommended
Hydraulic Valve Control
The L9390 is used in hydraulic systems for construction and agricultural machinery, controlling valves for boom, bucket, and steering functions. The 12-channel output enables simultaneous control of multiple hydraulic actuators, improving machine productivity. The SPI diagnostics provide real-time feedback on valve operation, allowing operators to detect issues early. The device's robust protection features, including overcurrent and overtemperature shutdown, ensure safe operation in demanding environments. The 100-pin eTQFP package is suitable for ruggedized control modules, and the wide operating voltage range supports 12V and 24V systems. For reliable operation, ensure proper thermal management and consider the total power dissipation when driving multiple valves. The L9390's low-side driver architecture is compatible with most hydraulic valve configurations, and the integrated freewheeling protection reduces EMI, making it a reliable choice for off-highway vehicles.
Recommended
Recommended Products Summary
Engineering reference data for L9390 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9301 | L9352 | MC33879 |
|---|---|---|---|---|
| Package | 100-eTQFP (14x14 mm) | 100-eTQFP (14x14 mm) - same | 100-eTQFP (14x14 mm) - same | 100-eTQFP (14x14 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Number of Channels | 12 | 8 | 4 | 8 |
| Interface | SPI | SPI | SPI | SPI |
| Output Type | Low-side driver | Low-side driver | Low-side driver | Low-side driver |
Key Differentiators
- 12-channel output capability (vs L9301 (8-channel))
- Same-brand STMicroelectronics reliability (vs MC33879 (NXP))
- SPI diagnostics (vs L9352 (4-channel))
Design Notes
The L9390 in a 100-pin eTQFP package can dissipate significant power when driving multiple channels at high current. Ensure adequate PCB copper area, preferably with a thermal pad connected to a large ground plane. For high ambient temperatures, consider forced air cooling or a heatsink. Calculate the total power dissipation as P = I^2 * Rds(on) * duty cycle per channel and sum across all active channels.
Place decoupling capacitors (100nF and 10uF) close to the VCC and GND pins to suppress noise and voltage spikes. For the SPI interface, keep traces short and use series resistors (e.g., 33 ohms) to reduce ringing. Ensure the ground plane is continuous under the IC to minimize EMI and improve thermal performance.
Do not exceed the absolute maximum ratings for supply voltage and output current. Verify the inductive load's flyback characteristics and ensure the integrated freewheeling protection is adequate; otherwise, add external flyback diodes. Properly configure the SPI diagnostic thresholds to avoid false fault detection. Also, ensure the enable pin is properly controlled during power-up to prevent unintended valve actuation.
Compliance Information
RoHS compliant per distributor listings. AEC-Q100 status not specified in verified data; automotive-grade expected but not confirmed.
