DRV8421

The DRV8421 provides a dual H-bridge motor driver for home appliances and other mechatronic applications. The device can be used to drive one or two DC motors, a bipolar stepper motor, or other loads. A simple PWM interface allows easy interfacing to controller circuits.

The output block of each H-bridge driver consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8421 is capable of driving a maximum current of 2A from each output or 4A in parallel mode (with proper heat sinking, at 12V and TA = 25°C).

The device contains two versions having a 4-wire input (DRV8421A) or a 2-wire input (DRV8421B). The 2-wire input version (DRV8421B) contains features like enable and fault detection, while the 4-wire input version (DRV8421A) can drive four half bridges based on signals to four input terminals. A low-power sleep mode is also provided for the 2-wire input version. It shuts down internal circuitry to achieve very-low quiescent current draw. This sleep mode can be set by pulling the enable pin low.

Internal protection functions are provided for UVLO, OCP, short-circuit protection, and overtemperature. Fault conditions are indicated by a nFAULT pin in the DRV8421B, the 2-wire input device.