Providing control and drive of the voice coil motor used for head positioning in disk drive applications, the A8958CLB is a full-bridge driver which can be configured so that its output current is a direct function of an externally applied control voltage or current. This linear current control function is supplemented by additional circuitry to protect the heads and the data disk during system failure or normal system shutdown.

FEATURES

■ Controlled-Velocity Head Parking

■ Zero Deadband

■ High Transconductance Bandwidth

■ User-Adjustable Transconductance Gain

■ ±800 mA Load Current

■ Dual Under-Voltage Monitors with Flag and User-Selectable Trip Points

■ Internal Thermal Shutdown Circuitry

■ Replaces UC3175