EP5357LUI Datasheet, PDF (15/17 Pages) Enpirion, Inc. – 600mA Synchronous Buck Regulator with Integrated Inductor

temperature, and are not suitable for switch-
mode DC-DC converter input filter applications.
Output Filter Capacitor
For VIN ≤ 4.3V, C_{OUT_MIN} = 10uF 0603 MLCC.
For VIN > 4.3V, C_{OUT_MIN} = 10uF 0805 MLCC.
Ripple performance can be improved by using
2x10µF 0603 MLCC capacitors (for any
allowed VIN).
The maximum output filter capacitance next to
the output pins of the device is 60µF low ESR
MLCC capacitance. V_OUT has to be sensed at
the last output filter capacitor next to the
EP5357xUI.
Recommended PCB Footprint
EP5357LUI/EP5357HUI
Additional bulk capacitance for decoupling and
bypass can be placed at the load as long as
there is sufficient separation between the V_OUT
Sense point and the bulk capacitance.
Excess total capacitance on the output (Output
Filter + Bulk) can cause an over-current
condition at startup. Refer to the section on
Soft-Start for the maximum total capacitance
on the output.
The output capacitor must use a X5R or X7R
or equivalent dielectric formulation. Y5V or
equivalent dielectric formulations lose
capacitance with frequency, bias, and
temperature and are not suitable for switch-
mode DC-DC converter output filter
applications.
Figure 12: EP5357 Package PCB Footprint
©Enpirion 2012 all rights reserved, E&OE
03409
15
September 12, 2012
www.enpirion.com
Rev: D