L9907

Overview

The L9907 is a highly integrated three-phase gate driver unit designed for brushless DC (BLDC) motors in automotive applications. It controls six N-channel FETs and supports 6-step or Field-Oriented Control (FOC) strategies. The device operates with a supply voltage range of 4.2 V to 54 V and withstands -7 V to 90 V at the high-side driver pins. It features an integrated boost regulator for full Rds(on) down to 6 V battery voltage. Key specifications include PWM operation up to 20 kHz, adjustable gate driver controlled current up to 600 mA, and an 8 MHz, 16-bit SPI interface. It includes two programmable differential current sense amplifiers and comprehensive protection against short circuits, over-temperature, and cross-conduction.

Feature Summary

• Integrated three-phase pre-driver with independent control of six channels for flexible motor control strategy implementation
• Built-in boost regulator ensuring sufficient gate charge for power MOSFETs even at low battery voltages down to 6 V
• Configurable dual current sense amplifiers allowing flexible phase or ground current sensing via SPI
• Comprehensive diagnostic and protection suite including over-temperature shutdown, short-circuit detection, and UV/OV monitoring

Applications

• Electric power steering systems
• Electric brake booster units
• Generic brushless DC motor driving in automotive environments

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or direct manufacturer channels. Confirm AEC-Q100 qualification status for automotive reliability requirements. Ensure ordering part numbers match specific package and tape/reel configurations. Request original datasheets and test reports to validate technical parameters against application needs before procurement.

Selection Notes

Select the L9907 for automotive BLDC motor applications requiring robust integration and high voltage tolerance. Consider its compatibility with 48V NET systems and ability to handle double battery environments. Evaluate the need for configurable current sensing and SPI-based real-time parameter adjustment. Ensure the design supports PWM frequencies up to 20 kHz and utilizes the integrated boost regulator for low-voltage startup performance.

Part Context

The L9907 belongs to STMicroelectronics' portfolio of automotive motor drivers, specifically targeting high-integration solutions for electric powertrain components. It complements other devices like the L9908 by offering specialized capabilities for three-phase BLDC motors. The component is supported by evaluation boards such as EVAL-L9907 and software tools like STSW-L9907 GUI for development and testing purposes within the automotive electronics ecosystem.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official STMicroelectronics resources for potential alternatives or pin-compatible upgrades based on specific system requirements and availability constraints.

FAQ

What is the maximum operating frequency for PWM signals?

The L9907 supports PWM operation up to 20 kHz.

How is the gate output current adjusted?

The base gate output current is set via an external resistor, while four distinct gate output current levels can be selected via SPI even during runtime.

Can the current sense amplifiers be configured?

Yes, the L9907 is equipped with two programmable differential current sense amplifiers where gain, offset, and mode can be configured via the SPI interface.