A8651 Buck Regulator

By Allegro MicroSystems, LLC 60

A8651 Buck Regulator

Allegro MicroSystems' A8651 is a dual 2 A, low VIN, synchronous regulator. The A8651 has adjustable frequency, integrates a high-side, P-channel MOSFET and a low-side, N-channel MOSFET. The A8651 incorporates current-mode control to provide simple compensation, excellent loop stability. The A8651 utilizes external compensation to accommodate a wide range of power components to optimize for transient response without sacrificing stability. The A8651 regulates input voltages from 2.5 V to 5.5 V, down to output voltages as low as 0.8 V, and is able to supply up to 2 A of load current per regulator.

Features and Benefits
  • Operating voltage range: 2.5 V to 5.5 V
  • UVLO STOP threshold is at 2.0 VTYP, 2.25 VMAX
  • Dual outputs with up to 2 A output current per regulator
  • Adjustable output voltage as low as 0.8 V
  • Internal 80 / 55 mΩ high and low-side switching MOSFET
  • Adjustable switching frequency (FSW): 0.35 MHz to 2.2 MHz
  • Post regulators for automotive infotainment and advanced driver assistance systems (ADAS)
  • Automotive infotainment LCD displays and audio

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