The L297 Stepper Motor Controller IC generates four phase drive signals for two phase bipolar and four phase uni-polar step motors in microcomputer controlled applications. The motor can be driven in half step, normal and wawe drive modes and onchip PWM chopper circuits permit switch-mode control of the current in the windings.
Brand: STMicroelectronics.

PUSH-PULL FOUR CHANNEL MOTOR DRIVER WITH DIODES
The L293 is an extremely popular Motor Driver IC (H-Bridge) for controlling DC and bipolar stepper motors.

The L298 is an integrated monolithic circuit in a 15-lead Multiwatt and PowerSO20 packages. It is a high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels anddrive inductive loads such as relays, solenoids, DC and stepping motors.