A8651: Low Input Voltage, Adjustable Frequency Dual Synchronous 2 A / 2 A Buck Regulator with Synchronization, 2x EN, and 2x NPOR

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The A8651 is an adjustable frequency, high output current, PWM regulator that 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, and fast transient response. The A8651 utilizes external compensation to accommodate a wide range of power components to optimize transient response without sacrificing stability. The A8651 regulates input voltages from 2.5 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.

The A8651 features include an externally adjustable and synchronizable switching frequency, an externally-set soft start time to minimize inrush currents, independent EN inputs, and independent NPOR outputs with either 7.5 ms (A8651) or 120 μs (A8651-1) delay. The sleep mode current of the A8651 control circuitry is less than 5 μA.

Protection features include VIN undervoltage lockout (UVLO), cycle-by-cycle overcurrent protection (OCP), hiccup mode short-circuit protection (HIC), overvoltage protection (OVP), and thermal shutdown (TSD). In addition, the A8651 provides open-circuit, adjacent pin short-circuit, and short-to-ground protection at every pin to satisfy the most demanding automotive applications.

The A8651 device is available in a 20-pin TSSOP package with exposed thermal pad for enhanced thermal dissipation (suffix LP). It is lead (Pb) free, with 100% matte tin leadframe plating.

  • AEC-Q100 Qualified
  • Operating voltage range: 2.5 to 5.5 V
  • UVLO stop threshold: 2.25 V (max)
  • Dual outputs with up to 2 A output current per regulator
  • Adjustable output voltage as low as 0.8 V
  • Internal 80 mΩ high-side switching MOSFET
  • Internal 55 mΩ low-side switching MOSFET
  • Adjustable switching frequency ( fSW ): 0.35 to 2.2 MHz
  • Synchronizes to external clock: 1.2 × to 1.5 × fOSC
  • 180° phase shift between switching regulators
  • Sleep mode supply current less than 5 μA
  • Soft start time externally set via the SS pin
  • Pre-biased startup capable
  • Externally adjustable compensation
  • Stable with ceramic output capacitors
  • Independent enable inputs and NPOR output pins
  • NPOR delay of 7.5 ms (A8651) or 120 μs (A8651-1)
  • Adjustable current limiting (OCP) for each regulator
  • Hiccup mode short-circuit protection (HIC)
  • Overvoltage and overtemperature protection
  • Open-circuit and adjacent pin short-circuit tolerant
  • Short-to-ground tolerant at every pin

Typical Applications

20-Pin eTSSOP with exposed thermal pad LP Package

The A8651 device is available in a 20-pin TSSOP package with exposed thermal pad for enhanced thermal dissipation (suffix LP). It is lead (Pb) free, with 100% matte tin leadframe plating.

LP Package Documentation

Part Number Specifications and Availability