AOS AOZ1237QI-01

The AOZ1237-01 is a high-efficiency, easy-to-use DC/DC synchronous buck regulator that operates up to 28V. The device is capable of supplying 8A of continuous output current with an output voltage adjustable down to 0.8V (±1.0%). The AOZ1237-01 integrates an internal linear regulator to generate 5.3V CC from input. If input voltage is lower than 5.3V, the linear regulator operates at low dropoutput mode, which allows the V CC voltage is equal to input voltage minus the drop-output voltage of the internal linear regulator. A proprietary constant on-time PWM control with input feed-forward results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input voltage range. The switching frequency can be externally programmed up to 1MHz. The device features multiple protection functions such as V CC under-voltage lockout, cycle-by-cycle current limit, output over-voltage protection, short-circuit protection, as well as thermal shutdown. The AOZ1237-01 is available in a 4mm×4mm QFN-23L package and is rated over a -40°C to +85°C ambient temperature range.

The AOZ1237-01 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 operating frequency range of 100kHz to 1MHz enables optimizing the configuration for PCB area and efficiency. The input voltage of AOZ1237-01 can be as low as 4.5V. The highest input voltage of AOZ1237-01 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 a ceramic output capacitor. The switching frequency can be externally programmed up to 1MHz. Protection features include V CC under-voltage lockout, valley current limit, output over voltage and under voltage protection, short-circuit protection, and thermal shutdown. The AOZ1237-01 is available in 23-pin 4mm x 4mm QFN package.

• Wide input voltage range – 2.7V to 28V
• 8A continuous output current
• Output voltage adjustable down to 0.8V (±1.0%)
• Low RDS(ON) internal NFETs – 35mΩ high-side – 12mΩ low-side SRFET
• Constant On-Time with input feed-forward
• Programmable frequency up to 1MHz
• Selectable PFM light load operation
• Ceramic capacitor stable
• Adjustable soft start
• Power Good output
• Integrated bootstrap diode
• Cycle-by-cycle current limit
• Short-circuit 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