AOZ1300AI datasheet(9/12 Pages) AOSMD

9 / 12 page

AOZ1300

Rev. 1.

3 August 2008

www.aosmd.com

Page 9 of 12

Power Dissipation Calculation

Calculate the power dissipation for normal load condition

using the following equation:

PD = RON x (IOUT)

The worst case power dissipation occurs when the load

current hits the current limit due to over-current or short

circuit faults. The power dissipation under these condi-

tions can be calculated using the following equation:

PD = (VIN – VOUT) x ILIMIT

PCB Layout Guidelines

Proximity of passive devices and adequate power and

ground planes are critical for reliable operation of the

circuit. In general, use the top layer for the high current

connections and the bottom or inner layer for the quiet

connections such as GND. The power traces must be

as short and wide as possible, because of large current.

Long metal traces and component leads may cause

unwanted parasitic inductance and capacitance. In order

to achieve the best performance special care has to be

taken for proper grounding. A good practice is always the

use of a separate ground plane or at least a single point

ground structure. It is recommended to use a PCB with at

least two sides. It is very important to place the input and

output capacitor as close as possible to the pin of the

device.

Silk Screen Top

Top Layer

Bottom Layer

AOZ1300AI Datasheet(PDF) 9 Page - Alpha & Omega Semiconductors