TI DRV8871DDA

The DRV8871 device is a brushed DC motor driver suitable for printers, electrical appliances, industrial equipment, and other small machines. Two logic inputs control the H-bridge driver, which consists of four N-channel metal-oxide-semiconductor field-effect transistors (MOSFETs) and can control the motor bidirectionally with a peak current of up to 3.6 A. By using the current decay mode, the motor speed can be controlled by performing pulse-width modulation (PWM) on the inputs. If both inputs are set to a low level, the motor driver will enter the low-power sleep mode.

The DRV8871 device features an advanced current regulation circuit that does not use an analog voltage reference or an external sense resistor. This new solution uses standard low-cost, low-power resistors to set the current threshold. The device can limit the current to a known level, which can significantly reduce the system power consumption requirements and eliminate the need for large-capacity capacitors to maintain a stable voltage, especially during motor startup and shutdown.

The device provides comprehensive protection against faults and short circuits, including under-voltage lockout (UVLO), over-current protection (OCP), and thermal shutdown (TSD). After the fault is resolved, the device will automatically resume normal operation.

The DRV8871 device is an optimized 8-pin device for driving brushed DC motors with 6.5 to 45 V and up to 3.6-A peak current. The integrated current regulation restricts motor current to a predefined maximum. Two logic inputs control the H-bridge driver, which consists of four N-channel MOSFETs that have a typical Rds(on) of 565 mΩ (including one high-side and one low-side FET). A single power input, VM, serves as both device power and the motor winding bias voltage. The integrated charge pump of the device boosts VM internally and fully enhances the high-side FETs. Motor speed can be controlled with pulse-width modulation, at frequencies between 0 to 100 kHz. The device has an integrated sleep mode that is entered by bringing both inputs low. An assortment of protection features prevent the device from being damaged if a system fault occurs.

• H-bridge motor driver for one DC motor, one stepper motor winding, or other loads
• 6.5V to 45V wide operating voltage range
• 565mΩ (typical) RDS(on) (HS + LS)
• 3.6A peak current drive capability
• PWM control interface with current regulation requiring no sense resistor
• Low-power sleep mode
• Compact package – 8-pin HSOP with PowerPAD 4.9mm×6mm
• Integrated protection features – VM undervoltage lockout (UVLO), overcurrent protection (OCP), thermal shutdown (TSD), automatic fault recovery

• Printers
• Appliances
• Industrial equipment
• Other electromechanical applications