General Description

The AOZ2261QI-18 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).

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 1.3μs.

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 AOZ2261QI-18 is available in a 4mm x 4mm QFN-

23L package and is rated over a -40°C to +85°C ambient

temperature range.

特性 Features

? Wide input voltage range

– 2.7V to 28V

? 8A continuous output current

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

? Low RDS(ON) internal NFETs

– 26m? high-side

– 12m? low-side

? Constant On-Time with input feed-forward

? Programmable on-time up to 1.3μs

? 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-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