Toshiba Electronic Devices & Storage Corporation has begun providing engineering samples of the TB9104FTG, a gate driver designed for bridge circuits that drive high-current automotive brushed DC motors in body system applications.
The device targets applications including power back doors, power sliding doors, power windows, and power seats.
The increasing electrification of movable vehicle components has led to a higher number of motors installed per vehicle, particularly in body systems. This trend has raised demand for more compact motor drive systems and fewer wire harnesses to support vehicle weight reduction.
The TB9104FTG is housed in a VQFN32 package measuring 5.0 mm × 5.0 mm (typical), with an exposed thermal pad on the underside to improve heat dissipation. When paired with external MOSFETs, it enables a compact drive circuit for high-current brushed DC motors.
The gate driver incorporates a serial peripheral interface (SPI) for communication with microcontrollers, allowing configuration settings and status monitoring. Motor rotation commands can be issued through dedicated pins or via SPI. Multiple TB9104FTG devices can share a single SPI bus, reducing the number of required wires and contributing to wire harness reduction.
A built-in PWM drive circuit allows continuous motor operation based on a preset PWM cycle after receiving a single rotation command from the microcontroller. This reduces the processing load on the microcontroller and minimizes SPI bus traffic in systems with multiple connected devices.
For safety in high-current applications, the TB9104FTG includes a high-precision current sense amplifier to monitor motor drive current. The amplifier output is fed back to the microcontroller to enable precise drive-stop control in the event of abnormal current. The device also incorporates additional abnormality detection and drive-stop functions.
Main specifications of the TB9104FTG include:
Supported motor: Brushed DC motor
Output channels: One channel (H-bridge configuration) or two channels (half-bridge configuration)
Main functions: Standby function, dead time control, PWM drive
Main abnormality detections: Power supply low voltage detection, charge pump overvoltage detection, overheat detection, VDS detection of external MOSFETs, SPI error detection
Absolute maximum ratings (Ta = -40 to 125°C):
Power supply VB voltage 1 (Vvb1a): -0.3 to 18 V
Power supply VB voltage 2 (Vvb2a): 18 to 40 V (within one second)
Power supply VCC voltage (Vvcc1a): -0.3 to 6.0 V
Power supply VDD voltage (Vvdd1a): -0.3 to 6.0 V
Ambient temperature (Ta): -40 to 125°C
Operating ranges (Ta = -40 to 125°C):
Operating power supply voltage 1 (VvbRNG): 5.7 to 18 V
Operating power supply voltage 2 (VvccRNG): 4.5 to 5.5 V
Operating power supply voltage 3 (VvddRNG): 4.5 to 5.5 V
Operating junction temperature (TjRNG): -40 to 150°C
The package is designated P-VQFN32-0505-0.50-009, with typical dimensions of 5.0 × 5.0 mm. The TB9104FTG is scheduled to be qualified to AEC-Q100 Grade 1 reliability standards.
Toshiba stated that it plans to expand its lineup of driver ICs for automotive motors.
