Driver circuit for a voice coil motor in a disk drive system

A system for providing de-latching of a head arm in a disk drive, comprising:

• a coil motor coupled to the head arm and having an input adapted to receive a drive potential, said coil motor further operably configured to displace the head arm responsive to said drive potential;
• and
• a driver device having an input adapted to receive an operating potential and operably configured to provide said drive potential to said coil motor input, wherein a magnitude of said drive potential is greater than a magnitude of said operating potential,
• wherein said driver device includes:
• a charge pump having an input adapted to receive said operating potential and operable to provide a high voltage potential having a magnitude greater than a magnitude of said operating potential;
• a regulator having an input adapted to receive said high voltage potential and operable to output said drive potential;
• a pass switch associated with said regulator;
• a current source having an output coupled to said pass switch and operable to provide a predetermined current supply;
• and
• a drive capacitor coupled to said regulator output and operable to be charged by said current source via said pass switch;
• wherein
• said pass switch is operable to limit current by which said current source charges said drive capacitor to said predetermined current supply.

An integrated circuit driver for providing a first voltage potential to a voice coil motor, wherein said first voltage potential is greater than an input supply voltage potential of said integrated circuit driver, said integrated circuit driver comprising

• a charge pump circuit having an input adapted to receive said input supply voltage potential and operably configured to increase a magnitude of said input supply voltage potential;
• a drive capacitor having an input adapted to receive a charge current and an output coupled to the voice coil motor;
• a voltage regulator having an input adapted to receive said increased input supply voltage potential magnitude and having a transistor switch operably configured to limit said charge current;
• and
• a current source having an output coupled to said transistor switch and operably configured to provide a current supply, wherein said charge current is limited to said current supply.