Alpha & Omega Semiconductor AOZ1268QI

Description

The AOZ1268 is high-efficiency, easy-to-useDC/DC synchronous buck regulators that operateup to 28V. The devices are capable of supplying10A of continuous output current with an outputvoltage adjustable down to 0.8V ±1%.The AOZ1268 integrates an internal linearregulatorto generate 5.3V VCC from input. If input voltageis lower than 5.3V, the linear regulator operates atlow drop output mode, which allows the VCCvoltage is equal to input voltage minus the dropoutputvoltage of the internal linear regulator.A proprietary constant on-time PWM control withinput feed-forward results in ultra-fast transientresponse while maintaining relatively constantswitching frequency over the entire input voltagerange. The switching frequency can be externallyprogrammed up to 1MHz.The devices feature multiple protection functionssuch as VCC under-voltage lockout, cycle-bycurrentlimit, output over-voltage protection, shortcircuitprotection, and thermal shutdown.The AOZ1268-DEMO demonstrates the COT buckconverter design. Different output voltage designsneed follow application note to changeparameters.

Features

Wide input voltage range:

• 2.7V to 28V
  8A continuous output current
  Output voltage adjustable to 0.8V ±1.0%
  Low RDS(ON) internal NFETs
• 28mΩ high-side
• 8mΩ low-side
  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 valley current limit
  Short-circuit protection
  Over voltage protection
  Thermal shutdown
  Thermally enhanced 23-pin 4×4 QFN

Typical applications

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

More information

• Datasheet
• IC product information