APW8816

APW8816 Single Buck PWM Controller With Linear Regulator Features PWM Controller Adjustable Output Voltage from +0.75V to +3.3V - 0.75V Reference Voltage - ±1% Accuracy Over-Temperature General Description The APW8816 is a single-phase, constant on-time, synchronous PWM controller with linear regulator, which drives N-channel MOSFETs. The APW8816 steps down high voltage to generate low-voltage chipset or RAM supplies in notebook computers. The APW8816 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the APW8816 provides very high efficiency over light to heavy loads with loadingmodulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low-noise requirements. The APW8816 is equipped with accurate positive current limit, output under-voltage, and output over-voltage protections, perfect for various applications. The PowerOn-Reset function monitors the voltage on VCC and PVCC to prevent wrong operation during power-on. The APW8816 has a 1.5ms digital soft start and built-in an integrated output discharge device for soft stop. An internal soft-start ramps up the output voltage with programmable slew rate to reduce the start-up current. A soft-stop function actively discharges the output capacitors. The integrated linear regulator could drive an external NChannel MOSFET and provides an adjustable output by using an external resistive divider. It is easy to be ...