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L7200

September 1999

This is preliminary information on a new product now in development. Details are subject to change without notice.

GENERAL

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12V (+/- 10%) OPERATION.

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REGISTER BASED ARCHITECTURE

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MINIMUM EXTERNAL COMPONENTS

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BCD TECHNOLOGY

VCM DRIVER

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1.7A DRIVE CAPABILITY

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0.75

Ω TOTAL BRIDGE IMPEDANCE AT 125°C

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LINEAR MODE

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PHASE SHIFT MODULATION (PWM MODE)

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INSTANTANEOUS, (GLICH FREE) SWITCH

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BETWEEN THE 2 MODES.

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CLASS AB OUTPUT DRIVERS

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ZERO CROSSOVER DISTORSION

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14 BIT DAC DEFINE OUTPUT CURRENT

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SELECTABLE TRANSCONDUCTANCE

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RAMP LOADING & PARKING VOLTAGE

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FULL INTERNAL VCM CALIBRATION

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DYNAMIC BRAKE

SPINDLE DRIVER

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2.5A DRIVE CAPABILITY

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0.75

Ω TOTAL BRIDGE IMPEDANCE AT

125°C

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SMOOTHDRIVE™ ARCHITECTURE

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SINUSOIDAL DRIVING, VOLTAGE MODE

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BIPOLAR DRIVING

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BEMF, INTERNAL OR EXTERNAL,

PROCESSING

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SENSOR-LESS MOTOR COMMUTATION

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PROGRAMMABLE COMMUTATION DELAY

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FIXED FREQUENCY PWM OPERATION

MODE

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INTERNAL FREQUENCY LOCKED LOOP

SPEED CONTROL (FLL)

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PROGRAMMABLE DIGITAL FILTER FOR

SPEED CONTROL LOOP

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BEMF RECTIFICATION DURING RETRACT

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BUILT-IN INDUCTIVE SENSING START UP

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DYNAMIC & REVERSE BRAKE

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BACK ROTATION DETECTION

OTHER FUNCTIONS

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12V, 5V , 3.3V AND 2.5V MONITORING WITH

POSSIBLE EXTERNAL SET TRIP POINTS

AND HYSTERESIS

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POWER UP/DOWN SEQUENCING

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8V, 3.3V AND 2.5V POSITIVE REGULATORS

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3.3V LOGIC COMPATIBILITY

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SHOCK SENSOR DETECTOR

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INTERNAL POR DELAY TIME AT POWER ON

(80ms)

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INTERNAL ISOFET FOR BEMF

RECTIFICATION

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THERMAL SHUTDOWN AND PRETHERMAL

WARNING

DESCRIPTION

The L7200 Mozart integrates into a single chip both

spindle and VCM controllers as well as power stag-

es. The device is designed for 12V disk drive appli-

cation requiring up to 2.5A of spindle and 1.7A of

VCM peak currents. The device is based on the sinu-

soidal driving of the spindle motor. This is realized

digitally by the SMOOTHDRIVE™ SYSTEM.

A serial port with up to 40 MHz capability provides

easy interface to the microprocessor. A register con-

trolled Frequency Locked Loop (FLL) allows flexibility

in setting the spindle speed. Integrated BEMF pro-

cessing, digital filter, digital masking, digital delay,

and sequencing minimize the number of external

components required.

TQFP64

ORDERING NUMBER: L7200

PRODUCT PREVIEW

MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER &

CONTROL “COMBO”

MULTIPOWER BCD TECHNOLOGY