General Description

The AOZ2151EQI-30 is a high-efficiency, easy-to-use

DC/DC synchronous buck regulator that operates up to

28V. The device is capable of supplying 4A of continuous

output current with an output voltage adjustable down to

0.8V ±1.

The AOZ2151EQI-30 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 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 AOZ2151EQI-30 is available in a 3mm×3mm QFN-

18L package and is rated over a -40°C to +85°C ambient

temperature range.

Features

 Wide input voltage range

– 6.5V to 28V

 4A continuous output current

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

 Low RDS(ON) internal NFETs

– 28m high-side

– 28m 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 3mm x 3mm QFN-18L package

Applications

 Compact desktop PCs

 Graphics cards

 Set-top boxes

 LCD TVs

 Cable modems

 Point-of-load DC/DC converters

 Telecom/Networking/Datacom equipment