H-bridge drivers for 2.5V motors

April 19, 2017 // By Nick Flaherty
Toshiba’s Storage & Electronic Devices Solutions division has launched three H bridge driver chips for DC brushed motors and stepping motors used in the mobile battery-drive equipment, home appliances, and housing and facility equipment.

The TC78H630FNG has one H bridge with a 2A rating and is suitable for the large current drive of DC brushed motors. The on-resistance of 0.4Ω in the motor driver output block allows the IC to handle a larger drive current

The TC78H621FNG and TC78H611FNG have two H bridges with 1A ratings, and are suitable for driving bipolar stepping motors or two DC brushed motors.

The series supports 2.5V to 15V power supplies for driving motors, and diverse applications include mobile devices (cameras and small printers) with a 3.7V lithium-ion battery, home appliances with 5V or 12V power supply (refrigerators and air-conditioners), and housing and facility equipment (smart meters, hot-water supply machines, water supply valves of water service, and electronic locks).

The devices include detection of over current, thermal shutdown and under voltage lockout to improve safety in driving the motor. They also include shoot-through current protection so that the motor can be controlled without considering the dead time in switching the output between ON and OFF.

The parts are packaged in a TSSOP16 and Samples are available now with mass production scheduled for end of July.