L6275

The L6275 integrates into a single chip both spindle and VCM controllers as well as power stages. The L6275 is designed for 12V disk drive application requiring up to 2.0A of spindle and 1.5A of VCM peak currents.

A serial port with up to 25 MHz capability provides easy interface to the microprocessor. A register controlled Frequency Locked Loop (FLL) allows flexibility in setting the spindle speed. Integrated BEMF processing, digital masking, digital delay, and sequencing minimize the number of external components required.

Power On Reset (POR) circuitry is included. Upon detection of a low voltage condition, POR is asserted, the internal registers are reset, and spindle power circuitry is tri-stated. The BEMF is rectified providing power for actuator retraction followed by dynamic spindle braking.

The L6275 is built in BICMOS technology allowing dense digital/analog circuitry to be combined with a high power DMOS output stage.