EP5348UI-E Enpirion, EP5348UI-E Datasheet - Page 9

• 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

sensing point so that it does not interfere with
the control loop operation. Excess total
capacitance on the output (Output Filter + Bulk)
can cause an over-current condition at startup.
Please see the Soft Start section under
Functional
allowable bulk capacitance on the output rail.
The output capacitor must use a X5R or X7R
or equivalent dielectric formulation.
equivalent
capacitance
temperature and are not suitable for switch-
mode
applications.
LDO Replacement
The
replacement for inefficient LDOs and can be
used to augment the LDOs in a PMU with
minimum footprint impact.
DCDC
efficiency, and significant reduction in power
loss.
extended battery life helps meet Energy Star
Layout Recommendations
Figure 4: Top PCB Layer Critical Components and
©Enpirion 2011 all rights reserved, E&OE
05721
Copper for Minimum Footprint
Enpirion
The resulting improved thermals and
solution
DC-DC
Overview
dielectric
with
EP5348UI
offers
converter
frequency,
for
formulations
significantly
is
This integrated
the
output
a
bias,
maximum
suitable
Y5V or
better
filter
lose
and
6/15/2011
9
requirements. The total solution size is 25%
smaller than a comparable LDO and half the
footprint of a comparable DCDC.
As the table below shows, EP5348UI provides
the optimal trade-off between footprint and
efficiency when compared to a traditional LDO:
Power-Up Sequencing
During power-up, ENABLE should not be
asserted before PVIN, and PVIN should not be
asserted before AVIN. Tying all three pins
together meets these requirements.
Figure 5: Bottom PCB Layer Critical Components
VIN
(V)
5.0
5.0
5.0
5.0
3.3
3.3
3.3
VOUT
(R
1.2
1.8
2.5
3.3
1.2
1.8
2.5
(V)
A
, R
LOAD
(mA)
400
400
400
400
400
400
400
B
, C
A
DCDC
70.4%
76.4%
81.6%
87.7%
77.1%
83.3%
88.2%
) & Copper for Minimum Footprint
EFF
24.0%
36.0%
50.0%
66.0%
36.4%
54.5%
75.8%
LDO
EFF
PLOSS
DCDC
(mW)
202
222
225
185
143
144
134
www.enpirion.com
PLOSS
(mW)
LDO
1520
1280
1000
680
840
600
320
EP5348UI
Power Saved
(mW)
1318
1058
775
495
697
456
186
Rev: B