DESCRIPTION

The voice coil driver L6246 is a linear power amplifier designed to drive single phase bipolar DC motors for hard disk drive applications. The device 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 0.5Ω (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.

■ 12V (±10) OPERATION

■ 3A MAXIMUM CURRENT CAPABILITY

■ 0.3Ω MAXIMUM ON RESISTANCE OF EACH POWER DMOS AT A JUNCTION TEMPERATAURE OF 25°C

■ CLASS AB POWER AMPLIFIERS

■ LOGIC AND POWER SUPPLY MONITOR

■ POWER ON RESET

■ PARKING FUNCTION WITH SELECTABLE RETRACT VOLTAGE AND DYNAMIC BRAKE BEFORE PARKING

■ ENABLE FUNCTION

■ GATE DRIVER FOR EXTERNAL BLOCKING N-MOSFET

■ OVERTEMPERATURE PROTECTION

■ OVERTEMPERATURE WARNING OUTPUT

■ PQFP44 PACKAGE