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A8585 Automotive, 2 A Output Buck Regulator

Allegro MicroSystems' A8585 is designed to provide the power supply requirements of next-generation car audio and infotainment systems. The A8585 is a variant of the A8580, but with lower IQ, better EMI performance, lower pin count, fixed VOUT (5 V/3.3 V options), options for selectable or auto-switchover of the PWM to PFM mode, and an option for selectable enable/sleep mode.

The options are summarized as follows:

Two versions of the A8585 Each version has two fixed-output voltage options
  • Selectable PWM/PFMn (A8585, A8585-1)
  • Selectable EN/SLEEPn (A8585, A8585-3)
  • 3.3 V±1.0% (A8585-1 and A8585-3)
  • 5.0 V±1.0% (A8585 and A8585-2)
Features and Benefits Applications
  • VIN operating range: 4 V to 35 V; withstand surge input to 40 V
    • Battery load dump capable
  • Operates down to 3.4 VIN-typ/3.6 VIN-max
    • Applicable to cold crank and idle/stop/start requirements
  • Delivers up to 2.0 A of output current
    • High-current applications
  • Integrated 110 mΩ high-side MOSFET
    • High efficiency and small implementation size
  • Utilizes Pulse Frequency Modulation (PFM) for low IQ
    • Minimizes battery drain in system quiescent and sleep modes
  • Adjustable switching frequency from 300 KHz to 550 KHz
    • Reduces interference in AM band and results in low power losses
  • Automotive infotainment
  • Instrumentation cluster
  • Center-stack applications
  • Automotive lighting controls
  • Advanced driver-assistance systems
  • Home audio
  • Industrial control

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