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IC manufacturers Alpha & Omega Semiconductor

IC manufacturers (84)

Alpha & Omega Semiconductor AOZ1268QI

24V/10A Synchronous EZBuckTM Regulator

Overview

TopologyBuck Converter
Input voltage2.7-28 V
Output 10.8 V / 8 A
IC revision1.0

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

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

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