EP5348UI-E Enpirion, EP5348UI-E Datasheet - Page 10

• Manufacturer Part Number: EP5348UI-E
• Description: Power Management Development Tools EP5348UI Eval Board 400mA/5MHz Buck Reg
• Manufacturer: Enpirion
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EP5348UI-E

• Product: Power Management Development Tools
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EP5348UI

Figures 4 and 5 show critical PCB top and
bottom layer components and traces for a
minimum-footpint
layout with ENABLE tied to V
ENABLE configurations need to be connected
and routed according to specific customer
application. This layout consists of four layers.
For the other 2 layers and the exact
dimensions, please see the Gerber files at
www.enpirion.com.
given below are general guidelines. Customers
may need to adjust these according to their
own layout and manufacturing rules.
Recommendation 1: Input and output filter
capacitors should be placed on the same side
of the PCB, and as close to the EP5348UI
package
connected to the device with very short and
wide traces. Do not use thermal reliefs or
spokes when connecting the capacitor pads to
the respective nodes. The +V and GND traces
between the capacitors and the EP5348UI
should be as close to each other as possible
so that the gap between the two nodes is
minimized, even under the capacitors.
Recommendation 2: The system ground
plane should be the first layer immediately
below the surface layer.
should be continuous and un-interrupted below
the converter and the input/output capacitors.
Please the Gerber files at www.enpirion.com.
Recommendation
should be used to connect ground terminal of
the input capacitor and output capacitors to the
system ground plane. It is preferred to put
these vias along the edge of the GND copper
closest to the +V copper. These vias connect
the input/output filter capacitors to the GND
plane, and help reduce parasitic inductances in
the input and output current loops. See Figure
©Enpirion 2011 all rights reserved, E&OE
05721
as
possible.
recommended
3:
The
Multiple
They
This ground plane
recommendations
IN
should
small
. Alternate
EP5348
vias
be
6/15/2011
10
4. If the two vias cannot be put under C
C
capacitors next the V
Recommendation 4: As Figure 5 shows, R
R
to minimize the footprint. These components
also need to be close to the VFB pin (see
Figures 3, 4 and 5). The VFB pin is a high-
impedance, sensitive node. Keep any trace
connected to this node as short and thin as
possible. Whenever possible, connect R
directly to the AGND pin instead of going
through the GND plane. In the layout shown
above, R
using a dedicated trace on layer 3 not shown
here. See Gerber files at www.enpirion.com.
Recommendation 5: AVIN is the power supply
for the small-signal control circuits. It should be
connected to the input voltage at a quiet point.
In Figure 4 this connection is made at the vias
just before C
decoupling capacitor C
connected between the device pin and the
GND plane.
Recommendation 6: The via to the right of pin
2 underneath the device helps to minimize the
parasitic inductances in the input and output
loop ground connections.
Recommendation 7: The top layer 1 metal
under the device must not be more than shown
in Figure 4. As with any switch-mode DC/DC
converter, try not to run sensitive signal or
control lines underneath the converter package
on other layers.
Recommendation 8: The V
should be just after the last output filter
capacitor. Keep the sense trace short in order
to avoid noise coupling into the node.
OUT
B
, and C
, then put two vias right after the
B
A
goes to the via next to AGND pin
have been placed on the back side
IN
. There is an additional
IN
and V
AVIN
www.enpirion.com
for AVIN which is
OUT
OUT
vias.
sense point
EP5348UI
IN
Rev: B
or
A
B
,