A full CMOS adaptive 3.3V/5V supply VCM/spindle controller with 9mA total current consumption in lock mode for high TPI and RPM of 8200 for 1' micro-drive, 1.8' drive, and 2.5' drive

摘要

The spindle VCM (voice coil motor) single chip is a full CMOS monolithic device that integrates spindle and VCM controllers as well as power stages into one chip. The device operates from a 3.3 V or 5 V power supply. The chip is designed for a small-form-factor hard disk drive application. A precision low voltage detection circuit monitors the power supply and initiates a VCM retract at voltage fault conditions. A 3-line serial port interface with read-back capability provides an interface to the microprocessor. The spindle driver features a transconductance amplifier, current sense amplifier, power output drivers, sequencer, internal delay/masking logic, spindle brake circuit, FLL, and charge pump for locking the spindle to the programmed rotational speed.