L9945 Description

The L9945 is an eight-channel MOSFET pre-driver with low-side, high-side, peak-and-hold, and H-Bridge load management options. The L9945 driver is built to meet the needs of 12 V (passenger vehicle) and 24 V (commercial vehicle) battery systems.The L9945 MOSFET has the ability to control two H-Bridges independently. The device can also drive two loads, which necessitates the use of a "peak & hold" control method.


L9945 Features

?AEC-Q100 qualified
?12V and 24V battery systems compliance
?3.3V and 5V logic compatible I/O
?8-channel configurable MOSFET pre-driver
oHigh-side (N-channel and P-channel MOS)
oLow-side (N-channel MOS)
oH-bridge (up to 2 H-bridge)
oPeak & Hold (2 loads)
?Operating battery supply voltage 3.8V to 36V
?Operating VDD supply voltage 4.5V to 5.5V
?All device pins, except the ground pins, withstand at least 40V
?Individual diagnosis for:
oShort circuit to battery
oOpen load
oShort circuit to ground
?Highly flexible overcurrent sensing implementation
oPossibility of monitoring external MOS drain to source voltage
oPossibility of monitoring voltage on external shunt resistor
o64 programmable overcurrent thresholds independent for each channel
oUltra-fast output shutdown in case of overcurrent
?Current limitation for H-Bridge configuration
?Programmable gate charge/discharge currents for improving EMI behavior
?32-bit SPI protocol available for configuration and diagnostics
oFailures latched even if they occur during diagnostics reading
oDaisy chain operation
oSDO protected against overvoltage
?Safety features
oFast switch off redundant output disable through two external pins
oBuilt In Self Test (BIST) for logic operation
oHardware Self Check (HWSC) for VDD5 overvoltage comparator
oConfigurable Communication Check (CC) watchdog timer available
oDisable feedback through bi-directional pin
oHighly redundant output monitoring through dedicated SPI registers
?10-bit ADC for battery and die temperature measurements available through SPI
?VDD5 monitoring for over/under voltage
?VPS (battery) monitoring for under voltage


L9945 Applications

Motor speed and motion control for off-axis applications
Replacement of linear and rotary optical sensor systems
Control of XYZ-tables
Robotic systems
Immune to external magnetic stray fields