Toshiba to Start Mass Production of Bipolar 2-channel Stepping Motor Driver with Maximum Rating of 40V and 2.0A

- Size-conscious design supported by package additions -

TOKYO — (BUSINESS WIRE) — July 28, 2016Toshiba Corporation's (TOKYO:6502) Storage & Electronic Devices Solutions Company today announced that mass production of "TC78S122FNG," a bipolar 2-channel stepping motor driver offering a maximum output withstand voltage of 40V and output current of 2.0A, will start on August 5. The company also added "TC78S122FTG" to its stepping motor driver line-up as a package variation housed in more compact QFN package, with mass production set to start at the end of August.

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Toshiba: bipolar 2-channel stepping motor driver "TC78S122FTG" (QFN package version) offering a maxi ...

Toshiba: bipolar 2-channel stepping motor driver "TC78S122FTG" (QFN package version) offering a maximum output withstand voltage of 40V and output current of 2.0A. (Photo: Business Wire)

High speed, high performance motor drives are required for applications that include printers, surveillance cameras, office automation equipment, banking terminals such as ATMs, banknote identification machines, amusement machines, and home appliances. In parallel, the downsizing of equipment is being accelerated by customer demand for space-saving products with excellent design. Measures to reduce heat generated inside equipment and low power consumption of the overall unit are also growing in importance.

Toshiba’s new motor driver has a 2-channel drive function in a two-in-one chip and is capable of running two stepping motors simultaneously. Space can be saved on circuit boards by integrating electronic components as two-in-one chips.

Because of the heat generated by the ICs themselves, previous products could not achieve continuous operation in the driving current range of the 2.0A motors that are used in many applications, including office equipment. The new product can simultaneously drive two channels by reducing the output resistance by 50% to cut heat generation*1.

While the regulator circuit for the IC's internal logic in earlier motor drivers operated during stand-by, the new motor driver incorporates a sleep function that stops the circuit, reducing the IC’s power consumption.

In addition to this, alongside driving stepping motors, the new motor driver also provides an interface for driving brushed DC motors that allows for various combinations of stepping motors and brushed DC motors; for example, one channel for a stepping motor and two channels for brushed DC motors.

Enhancing its product line-up allows Toshiba to meet various requirements for motor drive applications.

Main Features of New Products
- Low heat generation
Heat generation of the 2-channel simultaneous drive is reduced by low on resistance (0.6Ω or less, upper + lower).

- Low vibration and low noise
Maximum quarter step high-resolution motor driving technology and decay mode switching function for constant-current control are adopted to reduce vibration and noise.

- Low power consumption
A built-in sleep function by external pin control reduces IC current consumption during stand-by.

- Small package
Heat treatment of the equipment and the module can be simplified by adopting a small, high heat radiation HTSSOP/QFN package. This can contribute to downsizing the IC and reduce the cost.

- Build-in error detection circuits
The new product incorporates a thermal shutdown and an overcurrent shutdown circuit. The error signals they can output during equipment design contribute to the safety and the reliability of the final product.

Industrial equipment (surveillance cameras, banking terminals such as ATMs, office- and factory-automation equipment), amusement equipment (pachinko and video slot machines), and home appliances (refrigerators and air conditioners)


Main Specifications

Product name   TC78S122FNG   TC78S122FTG
Absolute maximum ratings 40V, 2.0A
Number of drive channels Stepping motor: maximum 2 channels

Motor with DC brush: maximum 4 channels

Control I/F CLK-IN

(Size: 12.5mm × 8.1mm × 1.2mm, pin pitch: 0.5mm)

(Size: 7mm × 7mm × 0.9mm, pin pitch: 0.5mm)

Other features  

The consumption current at standby is reduced by the built-in sleep function.
Built-in error detection function (over heat detection, and over current detection)
Error detection signal output function (ERR output)
Supports the power-on sequence by the single power drive


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