A8585 Automotive, Wide Input Voltage, Low Standby

By Allegro MicroSystems, LLC 57

A8585 Automotive, Wide Input Voltage, Low Standby

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
  • Selectable PWM/PFMn (A8585, A8585-1)
  • Selectable EN/SLEEPn (A8585, A8585-3)
Each version has two fixed-output voltage options
  • 3.3 V±1.0% (A8585-1 and A8585-3)
  • 5.0 V±1.0% (A8585 and A8585-2)
Features and Benefits
  • Utilizes pulse frequency modulation (PFM) for low IQ
    • Minimizes battery drain in system quiescent and sleep modes
  • 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
  • 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