Smart Driver IC for Battery Powered DC Motors - TMC7300 - Trinamic

January 6, 2020

Trinamic’s TMC7300 is the company’s second IC for low-voltage applications. The power driver with UART-based control for torque and velocity can drive up to two DC motors from 2 (1.8)…11V DC.

TRINAMIC Motion Control announces the TMC7300, a low-voltage driver for one DC motor up to 2A peak, or two DC motors up to 2.4A peak. Operating on a single or dual Li-Ion cell or at least 2 AA batteries, the TMC7300 is optimal for battery-operated equipment such as IoT and handheld devices, printers and POS applications, toys, cameras, and mobile medical devices.

Thanks to an integrated direct bridge, the chip can also be used to control solenoids, relays, and other actuators. Despite the small form factor – a QFN of 3x3 mm² with 20 pins in total, the TMC7300 scores with a high power density using integrated power MOSFETs and a complete integrated DC motor control logic. As such, it can control velocity and limit torque, or be used in torque-controlled operation.

For ease of use, the TMC7300 comes with a single-wire UART interface. Up to two DC motors can be controlled through it for direction, velocity, and torque. Together with Trinamic’s development environment, including open-source hardware and software, the new chip allows for rapid prototyping at reduced overhead cost.

Protection and diagnostic features support robust and reliable operation, including PWM control for smooth acceleration and deceleration, an internal current limiter to protect both the DC motor and power source and mechanical load sensing. Part of the diagnostic features, the chip detects errors including short detection and overtemperature. Once detected, the TMC7300 can disable the power stage and report the error via the interface or DIAG output.

Besides the TMC7300-LA there is also the breakout board TMC7300-BOB and the evaluation board TMC7300-EVAL.

Features and Benefits

  • Voltage range of 2 (1.8)…11V DC
  • Driver for 1 DC motor up to 2A, or 2 DC motors up to 2.4A
  • Battery operation with 1 or 2 Li-Ion cells, or at least 2 AA batteries
  • Single-wire UART with velocity control, torque control, and direction
  • Standby current draw of <50nA (typ.)
  • Low RDSon with LS 170mΩ & HS 170mΩ (typ.)
  • Full protection and diagnostics, including motor load feedback PWM control of LEDs
  • Suited for solenoids
  • QFN20 package (3x3 mm)


Product Page TMC7300

Datasheet TMC7300