General Description

The AOZ2387QI is a high-efficiency, easy-to-use DC/DC

synchronous buck regulator that operates up to 25 V. The

device is capable of supplying 20 A of continuous output

current with an output voltage adjustable down to 0.6 V

(±1.0).

The AOZ2387QI integrates an internal linear regulator to

generate 5.3 V VCC from input. If input voltage is lower than

5.3 V, 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. A low 80 ns minimum on-time

enables very low output voltages at ultra-high operating

frequencies.

Integrated AC ripple injection enables all-ceramic low ESR

output filter capacitors and smaller PCB footprint with no

external components needed.

Selectable PFM mode optimizes light load efficiency while

forced PWM mode maintains constant frequency for lower

harmonic noise.

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 AOZ2387QI is available in a 5 mm×5 mm QFN-28L

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

temperature range.

Features

• Wide input voltage range

- 5.5 V to 25 V if internal LDO supply VCC

- 4 V to 25 V if external VCC supply

• 20 A continuous output current

• Output voltage adjustable from 0.6 V ±1.0

• Low RDS(ON) internal NFETs

- 5 mΩ high-side

- 1.8 mΩ low-side

• Internal LDO

• Constant On-Time with input feed-forward

• Programmable on-time up to 3.5 μs and down to 80 ns

• Programmable switching frequency range: 1 MHz (for 12

VIN to 1 VOUT)

• Selectable PFM or forced PWM light load operation

• Ceramic capacitor stable

• Remote Sense

• Adjustable current limit setting

• Adjustable soft start

• Power Good output

• Integrated bootstrap diode

• Under-voltage protection and over-voltage protection

• Cycle-by-cycle current limit

• Short-circuit protection

• Thermal shutdown

• Thermally enhanced 5 mm x 5 mm QFN-28L package

Applications

• Compact PCs and gaming systems

• Set-top boxes and LCD TVs

• Server and storage systems

• Datacom and networking

• Embedded computing

• Point-of load DC/DC converters