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Date: 02-04-17

ST releases tiny 2.6A brushed DC motor driver for IoT devices

STMicroelectronics has unveiled a tiny 2.6A brushed DC motor driver ‘STSPIN250’ for portable, battery-powered IoT devices. The single-chip driver is designed to operate in battery-powered scenarios and can be forced in a zero-consumption state allowing a significant increase in battery life.

The driver integrates a full power-MOSFET bridge and fixed off-time PWM current controller in a tiny 3mm x 3mm package. It also has built-in protection features including under-voltage lockout (UVLO), non-dissipative over-current protection, short-circuit protection, and thermal shutdown.

·    On-resistance (RDS(ON))of the power stage (200mΩ total, high-side + low-side)
·    Operating voltage: 1.8V to 10V
·    Current-sipping standby mode: below 80 nA
·    Maximum output current 2.6 Arms with OUTAx paralled to OUTBx

Brushed DC motors offer a combination of performance, cost-effectiveness, and reliability, and hence designers use them in variety of applications.

STSPIN250’s high output-current capability allows use in low-to-medium-power applications such as portable printers, POS terminals, consumer devices, electronic valves or door lockers, toys, and medical or wellness devices ranging from electric toothbrushes to syringe pumps.

The STSPIN250 joins the three low-voltage ST’s family of drivers for the motor types used in portable applications:
a. STSPIN220 for stepper motors
b. STSPIN230 for three-phase brushless motors, and
c. STSPIN240 for brushed DC motors up to 1.3A

ST also offers a complete ecosystem to support evaluation and prototyping with the STSPIN250. It comprises an STM32 Nucleo expansion board (X-NUCLEO-IHM13A1) and related software tools (X-CUBE-SPN13) that connect motor-control projects with the STM32Cube MCU-development resources.

The STSPIN250 is in production now and is available in a tiny 3 x 3 x 1 mm VQFPN package. It’s priced at $0.75 for orders of 1000 pieces.


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