Toshiba Electronic Devices & Storage Corporation Announces New Line-up of Stepping Motor Driver ICs with Anti-Stall Feedback Architecture

Electronic Devices & Storage Corporation
(TDSC) today announced
the addition of two stepping motor drivers, 4.5A “TB67S249FTG” and 2A
“TB67S279FTG,” to its line-up of stepping motor drivers with innovative
anti-stall feedback architecture[1], which realizes highly
efficient motor control.

Stable, highly precise control is a basic operating requirement for
motors used in printers and other office equipment, banking terminals,
amusement machines, and home appliances. Demand for more efficient motor
operation and lower heat generation increases year by year as the scope
of application increases.

Avoiding stalls in stepping motor operation is the highest priority in
securing stability and precise control, and is achieved by providing
additional current that gives motors an operating torque margin.
However, although it prevents stalls, the additional current decreases
efficiency and generates heat. Complicated adjustments involving
monitoring torque in real time with additional sensors and
microcontrollers, and controlling the motor current are required to
improve efficiency, reduce heat generation and prevent stalls.

The new products follow “TB67S289FTG,” the first stepping motor to
incorporate original anti-stall active gain control (AGC[2]).
TB67S249FTG supports an industry-leading[3] large drive
current of 4.5A, 1.5 times that of TB67S289FTG. TB67S279FTG, with a
current rating of 2A, delivers excellent cost performance compared with
TB67S249FTG. All three products are compatible in packages, pin
alignments and functions, allowing easy replacement among them. They
enable optimal selection according to their applications, driving
conditions, and purpose of use.

Like TB67S289FTG, TB67S249FTG and TB67S279FTG can also monitor motor
operation and torque without an additional MCU, and optimize motor
control and efficiency by applying AGC. They prevent motor stalls and
automatically optimize motor current depending on the torque needed,
reducing motor power consumption by up to 80%, compared with other
solutions. They realize significant improvements in efficiency and heat
generation without relying on on-resistance.

Further efficiencies can also be achieved when these stepping motor
drivers are supported by advanced current detection system (ACDS[4]),
the innovative sense-resistor-free current monitor and control system,
which allows more free space and uses fewer external components on the

The application of advanced automation systems, including ACG, achieves
a series of products offering high performance motor control with a low
component count. TDSC positions the new series as its flagship line of
stepping motor drives, and will continue to expand the line-up.

Main Features
1. Anti-stall and high
The new AGC motor control architecture improves motor
efficiency and reduces heat generation. ACDS sense-resistor-less current
control reduces PCB space requirements. Moreover, high-resolution 1/32
step (max.) motor control contributes to suppression of noise and

2. Lower heat generation
Heat generation is reduced by low
on-resistance (TB67S249FTG: 0.33 Ω, TB67S279FTG: 0.60 Ω (upper + lower:

3. Small package and pin compatible among series products
in a small QFN package allows customers to reduce heat problems and
simplify set and module design patterns for heat dissipation. It will
also realize affordable solutions in terms of space and cost. Moreover,
TB67S289FTG, TB67S279FTG, and TB67S249FTG are compatible in packages and
pins, allowing optimal component selection and replacement according to
a usage environment.

4. Built-in error detection circuits
A motor load open detection
function is now incorporated, in addition to thermal shutdown,
over-current shutdown, and under voltage lock out. Error status can be
flagged to external devices by an error flag function.

Main Specifications

Product name   TB67S249FTG   TB67S279FTG
Control I/F CLOCK-IN


50V, 4.5A   50V, 2.0A
Package QFN48


Full, Half, Quarter, 1/8, 1/16, and 1/32 step resolutions


AGC: a current control method for anti-stall and highly efficient

ACDS: a current control method that does not require a sense

Built-in error detection functions (thermal shutdown, over-current
under voltage lock out, and motor load open detection)

Built-in error detection signal output function

Support the power-on sequence by the single power drive



End of September 2017


[1]: Motor stall: When motor rotation deviates from the
control signal, stalling occurs and the motor stops rotating.
AGC: A motor control architecture that automatically optimizes motor
current to torque while preventing motor stalls.
[3]: As of
September 14, 2017, Toshiba Electronic Devices & Storage Corporation
[4]: ACDS: A motor control architecture that does not
require an external sensing resistor to monitor the motor current.

For more information about these new products, please visit:


Customer inquiries:
Mixed Signal IC Sales and Marketing
Tel: +81-44-548-2821

Information in this document, including product prices and
specifications, content of services and contact information, is current
on the date of the announcement but is subject to change without prior

About Toshiba Electronic Devices & Storage

Toshiba Electronic Devices & Storage
Corporation (TDSC) combines the vigor of a new company with the wisdom
of experience. Since being spun off from Toshiba Corporation in July
2017, we have taken our place among the leading general devices
companies, and offer our customers and business partners outstanding
solutions in discrete semiconductors, system LSIs and HDD.

Our 19,000 employees around the world share a determination to maximize
the value of our products, and emphasize close collaboration with
customers to promote co-creation of value and new markets. We look
forward to building on annual sales now surpassing 700-billion yen (US$6
billion) and to contributing to a better future for people everywhere.
out more about us at


Media Inquiries:
Toshiba Electronic Devices & Storage
Chiaki Nagasawa, +81-3-3457-4963
Digital Marketing