Toshiba released the TC78H653FTG dual-H-bridge driver IC for DC brushed motors and stepper motors that delivers the low voltage (1.8V) and high current (4.0A) essential for low voltage equipment powered by dry-cell batteries, such as mobile devices, electronic products for the home and USB drives.
With the growing demand of applications based on IoT and other wireless technologies, the use of battery powered wireless motor control is increasing. This trend is further increasing the demand of driver ICs capable of driving devices even at the low voltage of 1.8V (0.9V × 2 batteries, whose capacity is reduced by discharge though 1.5V, 1.2V, etc. are initial voltages).
The mainstream devices have been H-bridge driver ICs constructed with bipolar transistors, which can achieve stable operation at low voltage but they consume high current and so shortens battery life and increase current losses in ICs, thus providing insufficient motor torque, since the voltage applied to the motor is lowered.
The new dual-H-bridge driver IC uses Toshiba’s specialized DMOS process for low voltage drives to achieve a longer battery life with a stable low voltage operation. It also offers improved motor torque by reducing IC losses through low on-resistance. The new product is suitable for motor applications driven by relatively low voltage batteries (1.8V to 7.0V).
1. Low current consumption prolongs battery life.
(ICC = 0.6 mA (typ.) in operation mode when VM = 3.0V and Ta = 25°C; ICC = 0 µA (typ.) in standby mode when VM = 3.0V and Ta = 25°C)
2. Low on-resistance reduces IC losses generated by voltage drops in the motor driver and increases the voltage applied to the motor, contributing to improved motor torque.
(Ron = 0.11Ω (typ.) (total of high and low sides in large mode when VM = 5V and Ta=25°C)
3. PWM control at 500 kHz is possible by high-speed output switching characteristics (ton = 90 ns, Toff = 90 ns).
Applications that need motors driven by relatively low voltage batteries (1.8V to 7.0V), mobile devices (cameras, electric toothbrushes, printers) using 3.7V lithium-ion batteries, products for the home, such as electronic locks, smart meters, electronic bidet toilet, and toys using two 1.5V dry batteries, and devices using 5V USB power supply.