EP5357LUI datasheet(15/17 Pages) ENPIRION

15 / 17 page

03409

September 12, 2012

Rev: D

EP5357LUI/EP5357HUI

www.enpirion.com

temperature, and are not suitable for switch-

mode DC-DC converter input filter applications.

Output Filter Capacitor

For VIN

≤ 4.3V, COUT_MIN = 10uF 0603 MLCC.

For VIN > 4.3V, COUT_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. VOUT has to be sensed at

the last output filter capacitor next to the

EP5357xUI.

Additional bulk capacitance for decoupling and

bypass can be placed at the load as long as

there is sufficient separation between the VOUT

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.

Recommended PCB Footprint

Figure 12: EP5357 Package PCB Footprint

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