DRV8808DCA

Overview

The DRV8808DCA is a combination motor driver featuring an integrated DC-DC converter, manufactured by Texas Instruments. It utilizes a full-bridge topology to drive brushed DC motors with a continuous output current of 2.8 A and peak currents up to 4.5 A. The device operates within a supply voltage range of 4.5 V to 36 V. Key electrical parameters include a quiescent current of 1 mA in shutdown mode and a typical switching frequency of 210 kHz for the internal regulator. It is housed in a 16-pin HTSSOP package designed for surface-mount installation.

Feature Summary

• Integrates three DC-DC switched-mode buck converters to generate programmable logic supply voltages from 1 V up to 90% of VM.
• Features active flyback diode control to reduce ringing and electromagnetic interference during motor commutation.
• Includes comprehensive protection mechanisms such as overcurrent protection, thermal shutdown, and undervoltage lockout.

Applications

• Battery-powered appliances requiring efficient power management
• Industrial automation systems with low-voltage DC motors
• Home appliance motor control circuits

Procurement Notes

Verify the specific suffix 'DCA' corresponds to the HTSSOP-16 package variant when sourcing. Confirm that the application requires the integrated DC-DC functionality, as this distinguishes it from standard bridge drivers. Ensure input voltage levels remain within the specified 4.5 V to 36 V range to prevent damage to the internal converter or motor stage.

Selection Notes

Select the DRV8808DCA when system design demands a compact solution that combines motor driving and logic power regulation on a single chip. It is suitable for applications where board space is limited and efficiency is critical due to the switched-mode nature of the internal regulators. Compare against non-integrated solutions if external component count reduction is not a primary constraint.

Part Context

This component belongs to the DRV880x family of motor drivers from Texas Instruments. While other members like the DRV8800 or DRV8801 provide similar motor drive capabilities, they lack the integrated DC-DC converters found in the DRV8808. This integration allows for simplified bill of materials and reduced footprint in designs requiring both high-current motor drive and lower-voltage logic supplies.

Replacement Considerations

Direct substitutes within the same family include the DRV8808PW (TSSOP package) or the DRV8808RTER (WQFN package). For functional equivalents without the DC-DC feature, consider the DRV8800 or DRV8801 series, though external logic power regulation will be required.

FAQ

What is the purpose of the integrated DC-DC converters in the DRV8808?

The three integrated DC-DC buck converters generate a programmable output voltage ranging from 1 V to 90% of the motor supply voltage (VM), providing power for the internal logic and gate drivers while improving overall system efficiency.

How does the DRV8808 handle back-EMF energy?

The device features active flyback diode control, which actively switches the low-side FETs to clamp the voltage and reduce ringing caused by back-EMF, thereby lowering electromagnetic interference (EMI).