STMicroelectronics L98GD8E 8-Channel MOSFET Pre-Driver
STMicroelectronics L98GD8E 8-Channel MOSFET Pre-Driver is configurable for low-side, high-side, peak and hold, and H-bridge load control. Engineers designed it to comply with the requirements of 12V and 48V passenger vehicles, as well as 24V commercial vehicles. All outputs can be PWM controlled. Six outputs can drive safety-relevant loads. The user can dedicate one output to actuate safety-relevant loads that require a dedicated enable pin (EN6).
The STMicroelectronics L98GD8E allows the control of two independent H-bridges. It can also drive up to two loads that require a "peak and hold" control strategy. The driver protects its outputs against short-circuit conditions. The device protects the external MOS in the event of an overcurrent. Each output provides full diagnostic information, including short to battery, short to ground, and open load. Users can constantly monitor each output status through dedicated SPI registers.
The voltage slew rate of the external transistors 1-8 is controlled during turn-on and turn-off to improve EMI behavior. A double-redundant external disable source is available via the DIS and NDIS pins to improve safety. The device is configurable via SPI through a 32-bit protocol.
Features
- AEC-Q100 qualified
- Designed to meet ISO21780
- 48V, 24V, 12V battery systems compliance
- 3.3V and 5V logic compatible I/O
- 8-channel configurable MOSFET pre-driver
- High-side (N-channel and P-channel MOS)
- Low-side (N-channel MOS)
- H-bridge (up to two H-bridges)
- Peak and hold (two loads)
- Operating battery supply voltage 3.8V to 70V
- Operating VDD supply voltage 4.5V to 5.5V
- Programmable gate charge/discharge currents for improving EMI behavior
- Individual diagnosis for
- Short circuit to the battery
- Open load Short circuit to ground
- Highly flexible overcurrent sensing implementation
- Possibility of monitoring external MOS drain to source voltage
- Possibility of monitoring voltage on the external shunt resistor
- 64 programmable overcurrent thresholds are independent for each channel
- Ultra-fast output shutdown in case of overcurrent
- Current limitation for H-Bridge configuration
- 32-bit SPI protocol available for configuration and diagnostics
- The device latches failures even if it occurs during a diagnostic reading
- Daisy chain operation
- SDO protected against overvoltage
- Safety features
- Fast switch off redundant output disable by two external pins
- Built-in Self Test (BIST) for logic operation
- Hardware Self Check (HWSC) for VDD5 overvoltage comparator
- Configurable Communication Check (CC) watchdog timer available
- Disable feedback by bi-directional pin
- Highly redundant output monitoring by dedicated SPI registers
- 10-bit ADC for battery and die temperature measurements available by SPI
- VDD5 monitoring for over/under voltage
- VPS (battery) monitoring for under-voltage
Applications
- Automotive 48V applications
- Low-side, high-side, Peak and hold, and H-bridge load control
- Designed for driving relays, motors, and all the resistive and inductive loads
Block Diagram
