AIC2863

AIC2863 3A 23V Synchronous PWM/PSM Step-Down Converter with High Light-load Efficiency  FEATURES  3A Continuous Output Current  Wide 4.75V to 23V Operating Input Range  Ouput Adjustable from 0.925V to 12V (VREF=0.925V Version)  Ouput Adjustable from 0.8V to 12V (VREF=0.8V Version)  Up to 84% Efficiency for Heavy Load (Vin=12V, Vout=3.3V, Iout=3.0A)  Up to 91% Efficiency for Moderate Load (Vin=12V, Vout=3.3V, Iout=1.0A)  Low Rds(on) Internal Switches: 100mΩ and 85mΩ  <3µA Supply Current in Shutdown Mode  340KHz/550KHz Frequency  Programmable Soft Start  Thermal Shutdown  Cycle by Cycle Over Current Protection  Under Voltage Lockout  Short Circuit Protection  Over Voltage Protection  APPLICATIONS  Networking Systems such as Modems & Routers  Distributed Power Systems  Pre-Regulator for Linear Regulators  Set-top Box  TYPICAL APPLICATIONS CIRCUIT  DESCRIPTION The AIC2863 is a 3A synchronous-rectified Buck converter with integrated low Rds(on) power MOSFETs. The AIC2863, designed with a currentmode control scheme, can convert wide input voltage to the adjustable output voltage to provide excellent output voltage regulation. It is stable with low ESR output ceramic capacitors. For high efficiency over all load current range, the AIC2863 is equipped with an automatic PSM/PWM mode operation. At light load, the IC operates in the PSM (Pulse Skipping Mode) to reduce switching losses. At heavy load, the IC works in PWM mode to provide high efficiency and excell...