A8650: Low Input Voltage, Adjustable Frequency 2 A Synchronous Buck Regulator with EN/SYNC and Power OK

The A8650 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 A8650 incorporates current-mode control to provide simple compensation, excellent loop stability, and fast transient response. The A8650 utilizes external compensation to accommodate a wide range of power components to optimize transient response without sacrificing stability. The A8650 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 at least 2.0 A of load current.

A8650功能包括外部可调节的开关频率，外部设置软启动时间，以最小化浪涌电流，EN / SYNC输入到ENABLE V._OUTand/or synchronize the PWM switching frequency, and a Power OK (POK) output to indicate when V_OUTis within regulation. The sleep mode current of the A8650 control circuitry is less than 3 μA. Protection features include V_我Nundervoltage lockout (UVLO), cycle-by-cycle overcurrent protection (OCP), hiccup mode short circuit protection (HIC), overvoltage protection (OVP), and thermal shutdown (TSD). In addition, the A8650 provides open circuit, adjacent pin short circuit, and short to ground protection at every pin to satisfy the most demanding automotive applications.

The A8650 is available in both 10-pin MSOP and DFN packages with an exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

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• Automotive AEC-Q100 qualified
• Operating voltage range: 2.5 to 5.5 V
• UVLO stop threshold: 2.25 V (max)
• 可调开关频率（F_osc.): 0.25 to 2.45 MHz
• 与外部时钟同步：1.2×至1.5×F._osc.(typ)
• 我nternal 70 mΩ high-side switching MOSFET
• 内部55MΩ低侧切换MOSFET
• Capable of at least 2.0 A steady-state output current
• Sleep mode supply current less than 3 μA
• Adjustable output voltage as low as 0.8 V with ±1% accuracy from –40°C to 125°C
• Soft start time externally set via the SS pin
• Pre-biased startup capable
• Externally adjustable compensation
• Stable with ceramic output capacitors
• Enable input, and Power OK (POK) output
• Cycle-by-cycle current limiting (OCP)
• Hiccup mode short circuit protection (HIC)
• Overvoltage protection (OVP)
• Overtemperature protection (TSD)
• Open circuit and adjacent pin short circuit tolerant
• Short to ground tolerant at every pin