2.6A brushed DC motor driver for portables & battery-power

March 21, 2017 // By Graham Prophet
STSPIN250 is a single-chip 2.6A driver for brushed DC motors that joins STMicroelectronics’ family of miniature, low-voltage, energy-efficient drivers for battery-powered portable and wearable applications.

The driver integrates a full power-MOSFET bridge and fixed off-time PWM current controller in a 3 x 3 mm package. The low on-resistance of the power stage (200 mΩ total, high-side + low-side) and the lowest-current-drain standby mode - below 80 nA - help maximize battery runtime. Its supply-voltage range of 10V to 1.8V allows designers to specify a power source as small as a single Li-ion cell.

 

Brushed DC motors offer performance, cost-effectiveness, and reliability, and are a popular choice of designers. 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. It also has comprehensive built-in protection features including Under-Voltage lockout (UVLO), non-dissipative over-current protection, short-circuit protection, and thermal shutdown.

 

The STSPIN250 joins the three monolithic, low-voltage drivers for portable and battery-powered applications that ST introduced last year: the STSPIN220 for stepper motors, STSPIN230 for three-phase brushless motors, and STSPIN240 for brushed DC motors up to 1.3A. Development is with the 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. STSPIN250 costs $0.75 (1000).

 

STMicroelectronics; www.st.com/STSPIN