L7220 Datasheet, PDF (1/4 Pages) STMicroelectronics – Disk drive spindle and VCM motor driver

L7220
Disk drive spindle and VCM motor driver
Data Brief
Features
■ Suitable for enterprise and multi-platter
desktop high performance drives
■ Register based architecture
■ Serial communication interface up to 60MHz
VCM driver
■ 2.5A peak current drive capability
■ Integrated bridge power devices with 0.3Ωmax
bridge impedance
■ 15 bit linear DAC for current command with
gain switch
■ Power on ramp loading and unloading
capability with 10 bit ADC
■ Fully integrated discontinuous mode ramp
unload circuitry at power off with end of travel
detection or alternate voltage mode power off
scheme
Spindle driver
■ 3.0A peak current drive capability
■ Integrated bridge power devices with 0.3Ωmax
bridge impedance
■ ST’s SmoothDrive™ architecture
■ Voltage mode sinusoidal driving
■ Inductance sense start-up capability
Other functions
■ 4 high efficiency hysteretic switching positive
regulators controllers with voltage margining
■ -5V regulator controller with voltage margining
TQFP64
(exposed pad down)
■ External isolation FET driver
■ Voltage monitoring
■ Power-on reset with soft start and
programmable integrated delay
■ 10 bit ADC with multiplexed inputs
■ Thermal sense circuit and overtemperature
shutdown
Description
L7220 is a motor controller IC designed for both
enterprise and multi-platter desktop hard disk
drive applications.
The spindle motor driver subsystem integrates all
power FETs driven by ST’s SmoothDrive
commutation technology.
The voice coil driver block includes the power
FETs, as well as ramp load and unload capability.
Hysteretic switching regulator controllers are
included.
L7220 embeds a serial interface with a maximum
speed of 60MHz.
Table 1.
Device summary
Order code
L7220
Package
TQFP64
Packing
Tray
December 2007
Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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