Overview
The L9945, produced by STMicroelectronics, is an automotive fully configurable 8-channel MOSFET pre-driver. It is designed to comply with the requirements of 12 V (passenger vehicle) and 24 V (commercial vehicle) battery systems. This device offers high flexibility in configuring its outputs for various load control strategies, including low-side, high-side, peak and hold, and H-Bridge configurations. The L9945 is AEC-Q100 qualified and RoHS compliant, ensuring it meets stringent automotive standards for reliability and environmental sustainability.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| Configurable Modes | Low-side, High-side, Peak & Hold, H-Bridge (up to 2 H-Bridge) |
| Operating Battery Supply Voltage | 3.8 V to 36 V |
| Operating VDD Supply Voltage | 4.5 V to 5.5 V |
| Logic Compatibility | 3.3 V and 5 V |
| Package Type | TQFP 64 10x10x1.0 |
| RoHS Compliance | Ecopack2 |
| AEC-Q100 Qualified | Yes |
| Maximum Voltage on Device Pins | At least 40 V (except ground pins) |
| Operating Temperature Range | -40°C to 150°C |
Key Features
- Configurable for low-side, high-side, peak and hold, and H-Bridge load control.
- PWM control capability for all outputs.
- Six outputs capable of driving safety-relevant loads, with one output dedicated to safety-relevant loads requiring a dedicated enable pin (EN6).
- Protection against short circuit conditions and overcurrent events.
- Full diagnostic information for each output, including short to battery, short to ground, and open-load, monitored through dedicated SPI registers.
- Programmable gate charge/discharge currents to improve EMI behavior.
- Double, redundant external disable source through DIS and NDIS pins for enhanced safety.
Applications
The L9945 is primarily used in automotive applications, particularly in systems requiring high flexibility and reliability such as:
- 12 V and 24 V battery systems.
- Safety-critical systems where diagnostic capabilities are essential.
- Load control systems requiring peak and hold or H-Bridge configurations.
- Automotive power management and control systems.
Q & A
- What is the L9945? The L9945 is an 8-channel MOSFET pre-driver configurable for low-side, high-side, peak and hold, and H-Bridge load control, designed for automotive applications.
- Is the L9945 RoHS compliant? Yes, the L9945 is RoHS compliant.
- What are the operating voltage ranges for the L9945? The operating battery supply voltage is 3.8 V to 36 V, and the operating VDD supply voltage is 4.5 V to 5.5 V.
- What types of load control can the L9945 support? The L9945 supports low-side, high-side, peak and hold, and H-Bridge load control configurations.
- Is the L9945 AEC-Q100 qualified? Yes, the L9945 is AEC-Q100 qualified.
- How many H-Bridges can the L9945 control? The L9945 can control up to two independent H-Bridges.
- What diagnostic capabilities does the L9945 offer? The L9945 provides full diagnostic information for each output, including short to battery, short to ground, and open-load, monitored through dedicated SPI registers.
- How can the L9945 improve EMI behavior? The L9945 allows programmable gate charge/discharge currents to improve EMI behavior.
- What is the package type of the L9945? The L9945 comes in a TQFP 64 10x10x1.0 package.
- Where can I find additional details and specifications for the L9945? Additional details and specifications can be found on STMicroelectronics' official website, as well as through authorized distributors like Newark Electronics, Avnet America, and Avnet Silica).
