FAN8621B Datasheet, PDF (1/21 Pages) Fairchild Semiconductor – 12V Spindle Motor and Voice Coil Motor Driver IC

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FAN8621B
12V Spindle Motor and Voice Coil Motor Driver IC
Features
General
• Hysteresis power on reset with delay function
• 5V, 12V supplies monitoring
• Thermal shut down(TSD)
• Programmable precision regulator usging minimal
external component
• Three state control input to reduce number of PINs
Spindle Motor(SPM)
• ASIC based start-up
• Internal back-EMF processing
• Internal sensorless commutation
• Internal SPM speed control with SFLL(Syncronized
Frequency Lock Loop).
• Linear SPM current control
• Selectable Motor Speed (5400/7200 RPM)
• Soft commutation circuitry to reduce acoustic noise
• Adjustable brake delay time
• Maximum 2A start-up current capability
• Internal and external spindle brake
• Speed lock indicator output
Voice Coil Motor (VCM)
• Intelligent retract (decreased bouncing)
• 1.2A internal VCM power driver
• Selectable transconductance
• 4V precision reference output
• Two PWM input (fine/coarse) for VCM set point
Typical Applications
• Hard disk drive(HDD)
Description
The FAN8621B, is a Bipolar monolithic stand-alone IC,
designed for 12V HDD applications.The internal power
stage consists of vertical PNP and NPN TRs for both SPM
and VCM, thus minimizing voltage drop, and increasing
drive capability up to 2A for SPM and 1.2A for VCM. This
device includes soft commutation drive to reduce audible
noise and intelligent retract function for decreased bouncing.
48-QFPH-1414
Ordering Information
Device
Package
FAN8621B 48-QFPH-1414
Operating Temp.
0 ~ 70°C
©2000 Fairchild Semiconductor International
1
Rev. 1.0.0
May. 2000.