AOS AOZ2261AQI-18

The AOZ2261AQI-18 is a high-efficiency, easy-to-use, synchronous buck regulator optimized for notebook computers. The regulator is capable of supplying 8A of continuous output current with an output voltage adjustable down to 0.8V. The programmable on-time from 100nS to 1.3μs enables optimizing the configuration for PCB area and efficiency. The input voltage of AOZ2261AQI-18 can be as low as 4V. The highest input voltage of AOZ2261AQI-18 can be 28V. Constant on-time PWM with input feed-forward control scheme results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input range. True AC current mode control scheme guarantees the regulator can be stable with ceramics output capacitor. The switching frequency can be externally programmed. Protection features include VCC under-voltage lockout, current limit, output over voltage and under voltage protection, short-circuit protection, and thermal shutdown. The AOZ2261AQI-18 is available in 23-pin 4mm×4mm QFN package.

• Wide input voltage range – 4V to 28V
• 8A continuous output current
• Output voltage adjustable down to 0.8V (±1.0%)
• Low RDS(ON) internal NFETs – 30mΩ high-side – 12mΩ low-side
• Constant On-Time with input feed-forward
• Programmable on-time up to 1.3μs
• Selectable PFM light-load operation
• Ceramic capacitor stable
• Adjustable soft start
• Ripple reduction
• Power Good output
• Integrated bootstrap diode
• Cycle-by-cycle current limit
• Short-circuit protection
• Over voltage protection
• Thermal shutdown
• Thermally enhanced 4mm x 4mm QFN-23L package

• Portable computers
• Compact desktop PCs
• Servers
• Graphics cards
• Set-top boxes
• LCD TVs
• Cable modems
• Point-of-load DC/DC converters
• Telecom/Networking/Datacom equipment