L7220| Datasheet

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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
TQFP64
(exposed pad down)

VCM driver

2.5A peak current drive capability Integrated bridge power devices with 0.3 max 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

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.

Spindle driver

3.0A peak current drive capability Integrated bridge power devices with 0.3 max bridge impedance ST's SmoothDriveTM 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 Device summary
Order code L7220

Table 1.

Package TQFP64

Packing Tray

December 2007

Rev 1

1/4
www.st.com 4

For further information contact your local STMicroelectronics sales office.