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L7220 Datasheet(PDF) 1 Page - STMicroelectronics |
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L7220 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 4 page Data Brief For further information contact your local STMicroelectronics sales office. December 2007 Rev 1 1/4 4 L7220 Disk drive spindle and VCM motor driver 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 0.3 Ωmax 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 0.3 Ωmax 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 ■ 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. TQFP64 (exposed pad down) Table 1. Device summary Order code Package Packing L7220 TQFP64 Tray www.st.com |
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