General Description
The AOZ2253LQI-30 is a high-efficiency, easy-to-use
DC/DC synchronous buck regulator that operates up to 28 V.
The device is capable of supplying 8 A of continuous output
current with an output voltage adjustable down to 0.6 V ±1%.
The AOZ2253LQI-30 integrates an internal linear regulator
to generate 5.3 V VCC from input. If input voltage is lower
than 5.3 V, the linear regulator operates at low drop output
mode, which allows the VCC 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 device features multiple protection functions such as
VCC under-voltage lockout, cycle-by-cycle current limit,
output over-voltage protection, short-circuit protection, and
thermal shutdown.
The AOZ2253LQI-30 is available in a 4 mm × 4 mm QFN-
22L package and is rated over a -40°C to +85°C ambient
temperature range.

Features
• Wide input voltage range
- 6.5 V to 28 V
• 8 A continuous output current
• Output voltage adjustable down to 0.6 V (±1.0%)
• Low RDS(ON) internal NFETs
- 28 mΩ high-side
- 11 mΩ low-side
• Constant on-time with input feed-forward
• Ceramic capacitor stable
• Adjustable soft start
• Integrated bootstrap diode
• Cycle-by-cycle current limit
• Short-circuit protection
• Thermal shutdown
• Thermally enhanced 4 mm x 4 mm QFN-22L package

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