DESCRIPTION

The L6269 integrates into a single chip both spindle and VCM controllers as well as power stages. The device is designed for 12V disk drive application requiring up to 2.0A of spindle and 1.5A of VCM peak currents.

A serial port with up to 25 MHz capability provides easy interface to the microprocessor. A register controlled Frequency Locked Loop (FLL) allows flexibility in setting the spindle speed. Integrated BEMF processing, digital masking, digital delay, and sequencing minimize the number of external components required.

GENERAL

■ 12V (+/- 10) OPERATION.

■ REGISTER BASED ARCHITECTURE

■ MINIMUM EXTERNAL COMPONENTS

■ BICMOS + VERTICAL DMOS (1.5mm)

VCM DRIVER

■ 1.5A DRIVE CAPABILITY

■ 0.9W TOTAL BRIDGE IMPEDANCE AT 25°C

■ LINEAR MODE

■ PHASE SHIFT MODULATION (PWM MODE)

■ INSTANTANEOUS, (GLICH FREE) SWITCH BETWEEN THE 2 MODES

■ CLASS AB OUTPUT DRIVERS

■ ZERO CROSSOVER DISTORSION

■ 14 BIT DAC DEFINE OUTPUT CURRENT

■ SELECTABLE TRANSCONDUCTANCE

■ 4 PROGRAMMABLE PARKING VOLTAGE

■ DYNAMIC BRAKE

SPINDLE DRIVER

■ 2.0A DRIVE CAPABILITY

■ 0.8W TOTAL BRIDGE IMPEDANCE AT 25°C

■ BEMF, INTERNAL OR EXTERNAL, PROCESSING

■ SENSOR-LESS MOTOR COMMUTATION

■ PROGRAMMABLE COMMUTATION PHASE DELAY

■ LINEAR MODE AND CONSTANT TOFF PWM OPERATION MODE

■ INTERNAL FREQUENCY LOCKED LOOP SPEED CONTROL (FLL)

■ BEMF RECTIFICATION DURING RETRACT

■ BUILT-IN ALIGNAMENT&GO START-UP

■ INDUCTIVE SENSING START UP OPTION

■ RESYNCHRONIZATION

■ DYNAMIC & REVERSE BRAKE

■ CONTROLLABLE OUTPUT SLEW RATE

OTHER FUNCTIONS

■ 12V AND 5V MONITORING WITH EXTERNAL SET TRIP POINTS AND HYSTERESIS

■ POWER UP/DOWN SEQUENCING

■ LOW VOLTAGESENSE

■ 3.3V INPUT LOGIC COMPATIBILITY

■ THERMAL SHUTDOWN AND PRETHERMAL WARNING