General Description
The AOZ2238-01 is a high-efficiency, easy-to-use DC/DC
synchronous buck regulator that operates up to 28V.
The device is capable of supplying 10A of continuous
output current with an output voltage adjustable down to
0.8V (±1.0%).
The AOZ2238-01 integrates an internal linear regulator
to generate 5.3V VCC from input. If input voltage is lower
than 5.3V, the linear regulator operates at low dropoutput
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 switching frequency
can be externally programmed up to 1MHz.
The device features multiple protection functions such as
VCC under-voltage lockout, cycle-by-cycle current limit,
output over-voltage protection, short-circuit protection, as
well as thermal shutdown.
The AOZ2238-01 is available in a 4mm x 4mm QFN-23L
package and is rated over a -40°C to +85°C ambient
temperature range.

Features
 Wide input voltage range
– 6.5V to 28V
 10A continuous output current
 Output voltage adjustable down 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 current limit
 Short-circuit protection
 Thermal shutdown
 Thermally enhanced 4mm x 4mm QFN-23L package

Applications
 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