Motor drivers are current amplifiers to run a motor, which act as a bridge between the controllers and the motors. The motor drivers are made from discrete components, which are integrated inside an IC. A motor can be a brushless DC motor, brushed DC motor, stepper motor, or other DC motor. Motor drivers are required to interface the controllers to the motors. There are several types of motor driver circuits where an H bridge circuit is a commonly used circuit. H-bridge is a very effective method for driving motors, and it is applied in several electronic projects. It is particularly used to control reverse and forward rotation for DC brushed motors and stepping motors.
Tokyo-headquartered Toshiba, the Japanese multinational conglomerate company, offers various products based on semiconductors, electronics, social infrastructure, and computer hardware. Recently, Toshiba Electronic Devices & storage Corporation publicized the dual-H-bridge IC, “TC78H653FTG.” This new IC implementation in motors will deliver the low voltage (1.8V) and high current (4.0A) which is essential for low voltage equipment powered by dry-cell batteries.
The previously launched H-bridge Driver IC was supporting 1.8V low-voltage and 1.6a large-current drive. These H-bridge driver ICs were constructed with bipolar transistors. They could achieve stable operation at low voltage, but the disadvantage was the consumption of high current. This features lead to the shorter battery life and increased current losses in ICs.
TC78H653FTG, the dual-H-bridge driver IC, uses Toshiba’s functional DMOS process for low voltage drives. This leads to achieve a longer battery life with a stable low voltage operation. It also offers improved motor torque by decreasing IC losses through low on-resistance. The new product suits motor applications, which have low voltage batteries (1.8V to 7.0V). This product is encased in a 3.0mm x 3.0mm QFN16 package that occupies less than one-third of the space of the previous driver.
Motor applications are driven by relatively low-voltage batteries, mobile devices such as cameras, electric toothbrushes, and 3.7V lithium-ion battery printers, home automation products such as electronic locks, smart meters, electronic bidet toilets, and toys with two 1.5V dry batteries and devices.