New TI motor drivers for stepper and brushed DC motors lower RDSon more than 60 percent

by Toni McConnel , TechOnline India - June 02, 2011

TI has expanded its DRV8x motor driver family with eight new devices supporting up to 5 A for higher-current bipolar stepper and brushed DC motors.

Texas Instruments has expanded its DRV8x motor driver family with eight new devices supporting up to 5 A for higher-current bipolar stepper and brushed DC motors. The new DRV8x motor drivers provide RDSon as low as 100 milliohms, more than 60 percent less than the previous generation, enabling higher current and better thermal performance. Microstepping options within the family include up to 256 microsteps and greater with an external microcontroller or up to 32
microsteps with an on-chip indexer.

Key features

Bipolar stepper motor drivers: 2.5-A to 5-A peak current options and control interfaces for phase-enable (PH/EN), step/direction with indexer and pulse-width modulation (PWM) control. Supports 1/256 and greater microstepping, along with slow, mixed and fast decay modes, for smooth, quiet, high-resolution motion profiles in applications such as printers, scanners, security cameras, cash handlers, medical equipment and factory automation.

Brushed DC motor drivers: 2.5-A to 5-A peak current options and control interfaces for PH/EN and PWM control. On-chip cycle-by-cycle inrush protection limits start-up and stall currents, protecting the driver and reducing overall system cost in a variety of applications, such as printers, robotics, toys, servo motors, textile manufacturing equipment, solenoid valves and consumer electronics.

Robust, reliable and fully protected: Advanced on-chip protection, including over-current, over-temperature, shoot-through and under-voltage lock-out increases system reliability and manufacturing yields.

Reduce design complexity and time to market: DRV8x motor drivers integrate the gate drive circuitry, MOSFETs, protection circuitry and current regulation circuitry to reduce design complexity, board space and time to market compared to discrete solutions.

Upgrade path: Pin-for-pin compatibility with existing DRV8x motor drivers provides flexibility for high or low current.

Bipolar stepper motor drivers

DRV8813: Up to 2.5 A with four levels of current regulation and a PH/EN control interface.

DRV8825: Up to 2.5 A with on-chip indexer supporting up to 32 microsteps.

DRV8829: Up to 5 A with 32 levels of current regulation and a PH/EN
control interface; two DRV8829 devices are required to drive a single
5-A bipolar stepper motor.

Brushed DC motor drivers

DRV8814: Supports two 2.5-A brushed DC motors with cycle-by-cycle inrush protection and a PH/EN control interface.

DRV8840: Up to 5 A with cycle-by-cycle inrush protection and a PH/EN control interface.

Bipolar stepper or brushed DC motor drivers


DRV8841: Supports a single 2.5-A bipolar stepper motor or two 2.5-A
brushed DC motors with four levels of current regulation, cycle-by-cycle
inrush protection and a PWM control interface supporting brake.

DRV8842: Supports a single 5-A brushed DC motor; two DRV8842 devices can also be used to drive a single 5-A bipolar stepper motor; includes 32 level of current regulation, cycle-by cycle inrush protection and a PWM control interface supporting brake.

DRV8843: Supports a single 2.5-A bipolar stepper motor or two 2.5-A brushed DC motors with four levels of current regulation, cycle-by-cycle inrush protection and a PWM control interface supporting brake and coast.

Availability and pricing

The new DRV8x motor drivers are available today in a 9.7 mm x 6.4 mm HTSSOP package. All are priced at $2.25 in 1,000-unit quantities with the exception of the DRV8825, which is available for $2.40 for 1,000 units. Order samples of the DRV8x family at www.ti.com/drv8x-pr. For more information or to place an order, visit www.ti.com/drv8x-pr.

An evaluation module (EVM), including schematics, gerbers, an easy-to-use graphical user interface for easy setup, and all necessary cabling and software, is available for each of the eight new motor drivers for a suggested retail price of $149.

Check out motor drive and control selection guides, training, videos, application notes and block diagrams at www.ti.com/motor-pr. Ask questions, help solve problems in the Motor Drivers Forum in the TI E2E Community at www.ti.com/e2emotor-pr.

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