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L6246

12V VOICE COIL MOTOR DRIVER

STMicroelectronics 

L6246

12V VOICE COIL MOTOR DRIVER

12V (±10%) OPERATION

3A MAXIMUM CURRENT CAPABILITY

0.3Ω MAXIMUM ON RESISTANCE OF EACH

POWER DMOS AT A JUNCTION TEM-

PERATAURE 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

MULTIPOWER BCD TECHNOLOGY

PQFP44 (10x10)

DESCRIPTION

The voice coil driver L6246 is a linear power am-

plifier designed to drive single phase bipolar DC

motors for hard disk drive applications. The de-

vice contains a selectable transconductance loop,

which allows high precision for head positioning.

The power stage is composed of 2 power amplifi-

ers, in AB class, with 4 DMOSs, with Rdson of

0.5Ω (Sink+Source) maximum, in a H-bridge con-

figuration. Drive voltage for the upper DMOS

FETs is provided by a charge pump circuit to en-

sure 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 en-

ables the head retract. In addition, a 5V stable

output is provided for the external usage, and a

gate driver circuit enables an external power sup-

ply isolation N-MOSFET.

This device is built in BCD II technology allowing

dense digital circuitry to be combined with high

power bipolar power devices and is assembled in

PQFP44.

February 1998

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