General Description

The AOZ2261AQI-15 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.

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 on time can be

externally programmed up to 3.5μs.

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 AOZ2261AQI-15 is available in a 4mm×4mm QFN-

22L package and is rated over a -40°C to +85°C ambient

temperature range.

特性 Features

? Wide input voltage range

– 4V to 28V

? 8A continuous output current

? Output voltage adjustable down to 0.8V (±1.0)

? Low RDS(ON) internal NFETs

– 30m? high-side

– 12m? low-side

? Constant On-Time with input feed-forward

? Programmable on-time up to 3.5μs

? Selectable PFM light-load operation

? Ceramic capacitor stable

? Adjustable soft start

? Ripple reduction

? Power Good output

? Integrated bootstrap diode

? Cycle-by-cycle current limit

? Short-circuit protection

? Over voltage protection

? Thermal shutdown

? Thermally enhanced 4mm x 4mm QFN-22L 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