DESCRIPTION

The Si9961A is a linear actuator (voice coil motor) driver suitable for use in disk drive head positioning systems. The Si9961A contains all of the power and control circuitry necessary to drive the VCM that is typically found in 3 1/2 inch hard disk drives and optical disk drives. The driver is capable of delivering 1.8 A at a nominal supply of 12 V.

FEATURES

• 1.8 A H-Bridge Output

• Class B Linear Operation

• Externally Programmable Gain and Bandwidth

• Undervoltage Head Retract

• Programmable Retract Current

• Low Standby Current

• Rail-to-Rail Output Swing

• Single 12 V Supply

• System Voltage Monitor with Fault Output