EP5388QI Datasheet, PDF (11/14 Pages) Enpirion, Inc. – 800mA Synchronous Buck Regulator With Integrated Inductor 3mm x 3mm x 1.1mm Package

July 2008
EP5388QI
Recommendation 4: Multiple small vias (approximately 0.25mm finished diameter) should be used
to connect the ground terminals of the input and output capacitors, and the surface ground pour
under the device, to the system ground plane. If a local ground island is used on PCB layer 2, the
vias should connect to the ground island and continue down to the PCB system ground plane.
Recommendation 5: The AGND pin should be connected to the system ground plane using a via as
described in recommendation 4. AGND must NOT be connected to the surface layer ground pour.
Recommendation 6: As with any switch-mode DC-DC converter, do not run any sensitive signal or
control lines under the converter package.
Vias
Slit
Figure 6. PCB layout recommendation.
Recommended PCB Footprint
©Enpirion 2008 all rights reserved, E&OE
11
www.enpirion.com