L6246

The voice coil driver L6246 is a linear power amplifier designed to drive single phase bipolar DC motors for hard disk drive applications. The L6246 contains a selectable transconductanceloop, which allows high precision for head positioning.

The power stage is composed of 2 power amplifiers, in AB class, with 4 DMOSs, with Rdson of 0.5W (Sink+Source) maximum, in a H-bridge configuration. Drive voltage for the upper DMOS FETs is provided by a charge pump circuit to ensure low Rdson.
 
Automatic brake and parking of the head actuator is performed by logic or when a failure condition is detected by power supply monitors. An external resistor programs the parking voltage that enables the head retract. In addition, a 5V stable output is provided for the external usage, and a gate driver circuit enables an external power supply isolation N-MOSFET.

This L6246 is built in BCD II technology allowing dense digital circuitry to be combined with high power bipolar power devices and is assembled in PQFP44.