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

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.

保护功能包括VIN欠压锁定（UVLO），周期循环过电流保护（OCP），打嗝模式短路保护（HIC），过压保护（OVP）和热关断（TSD）。此外，A8651还提供开路，相邻的销短路和每个PIN的短接地保护，以满足最苛刻的汽车应用。亚博尊贵会员

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.

亚博尊贵会员

• GPS/Infotainment
• Automotive audio
• Home audio
• Network and telecom

• 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
• 内部55MΩ低侧切换MOSFET
• 可调开关频率（F_SW): 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模式短路保护（HIC）
• Overvoltage and overtemperature protection
• Open-circuit and adjacent pin short-circuit tolerant
• Short-to-ground tolerant at every pin