AOZ1233-01
28V/8A Synchronous EZBuck
TM
Regulator
General Description
The AOZ1233-01 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 AOZ1233-01 integrates an internal linear regulator
to generate 5.3V V
CC
from input. If input voltage is lower
than 5.3V, the linear regulator operates at low drop-
output 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-current limit, output
over-voltage protection, short-circuit protection, as well
as thermal shutdown.
The AOZ1233-01 is available in a 5mm x 5mm QFN-30L
package and is rated over a -40°C to +85°C ambient
temperature range.
Features
Wide input voltage range
–
2.7V to 28V
8A continuous output current
Output voltage adjustable down to 0.8V (±1.0%)
Low R
DS(ON)
internal NFETs
–
25m high-side
–
10m low-side SRFET™
Constant On-Time with input feed-forward
Programmable frequency up to 1MHz
Internal 5.3V/20mA linear regulator
Ceramic capacitor stable
Adjustable soft start
Power Good output
Integrated bootstrap diode
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Thermally enhanced 5mm x 5mm QFN-30L package
Applications
Portable computers
Compact desktop PCs
Servers
Graphics cards
Set-top boxes
LCD TVs
Cable modems
Point-of-load DC/DC converters
Rev. 1.2 October 2012
www.aosmd.com
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