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AOZ1034 Datasheet(PDF) 12 Page - Alpha & Omega Semiconductors

Part No. AOZ1034
Description  EZBuck™ 4A Synchronous Buck Regulator
Download  18 Pages
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Maker  AOSMD [Alpha & Omega Semiconductors]
Homepage  http://www.aosmd.com
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AOZ1034 Datasheet(HTML) 12 Page - Alpha & Omega Semiconductors

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Rev. 1.1 September 2010
www.aosmd.com
Page 12 of 18
AOZ1034
The AOZ1034DI comes in a standard 5x4 DFN-8 or
exposed pad SO-8 package. Several layout tips are listed
below for the best electric and thermal performance.
1.
The LX pins are connected to internal PFET and
NFET drains. They are low resistance thermal
conduction path and most noisy switching node.
Connected a large copper plane to LX pin to help
thermal dissipation. For full load (4A) application,
also connect the LX pads to the bottom layer by
thermal vias to enhance the thermal dissipation.
2.
Do not use thermal relief connection to the VIN and
the PGND pin. Pour a maximized copper area to the
PGND pin and the VIN pin to help thermal
dissipation.
3.
Input capacitor should be connected to the VIN pin
and the PGND pin as close as possible.
4.
A ground plane is preferred. If a ground plane is not
used, separate PGND from AGND and connect them
only at one point to avoid the PGND pin noise
coupling to the AGND pin.
5.
Make the current trace from LX pins to L to Co to the
PGND as short as possible.
6.
Pour copper plane on all unused board area and
connect it to stable DC nodes, like VIN, GND or
VOUT.
7.
Keep sensitive signal trace far away from the LX
pins.


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