Enpirion® Power Evaluation Board
EN5365QI 6A Buc k Powe r So C
With VID Output Voltage Select
Evaluation Board Us er G uide
Description
This is the EN5365QI User Guide. The
EN5365QI features an integrated inductor,
power MOSFETS, controller, a bulk of the
compensation network, and protection circuitry
against system faults. The EN5365QI features
a 3 pin VID output voltage selector. The 3 pin
VID allows the user to choose from one of
seven predefined output voltage settings. This
level of integration delivers a substantial
reduction in footprint and parts count over
competing solutions. The evaluation board is
optimized for engineering ease of testing
through programming options, clip leads, test
points etc .
Evaluation Board Over View
Figure 1. EN5365QI Eval uat i on B oard Ill ust ration (F ol l ow inst ruct i ons on page 2)
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2
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10706 February 6, 2015 Rev C
EN5365QI Ev aluation Board
Instructions
The numbers in the instructions below correspond
to the num bers in Figure 1. By fol lowing the num be r
sequence below, the device can be turned on by
step 5.
1) ENABLE – The jumper on the left two pins
enables the device by connecting ENABLE
to AVIN. Remove this jumper and then
connect it to the right two pins to connect
ENABLE to ground and disable the device.
Leave the pins open and use an external
signal to the center pin to toggle the
ENABLE on (>1.8V) and off (<0.8V).
2) Output Voltage Settings (VSx) - As
shown, output voltage is set to 1.8V. The
left pin of VS2, VS1, VS0 pulls VS2, VS1,
VS0 pin to AVIN (high = 1), respectively.
The r ight pin pulls the VS2, VS1, VS0 pin to
ground (low = 0). DO NOT change the
output voltage when the device is in
regulation; otherwise, damage may occur.
Follow the Table below for other output
voltage settings.
VS2 VS1 VS0 VOUT
0
0
0
3.3V
0
0
1
2.5V
0
1
0
1.8V
0
1
1
1.5V
1
0
0
1.25V
1
0
1
1.2V
1
1
0
0.8V
1
1
1
Reserved
3) PVIN (J2) - Connect 2.5V to 5.5V supply on
J2 (VIN). Do not turn on until everything is
connected correctly.
4) Ground (J3 and J4) - Connect the input
supply ground to J4 and the output ground
to J3.
5) VO UT ( J5) - Connect the load to J5. If th e
instructions were followed up to this point,
the device may be power ed to turn on.
6) POK - This is the open drain POK flag,
which is pulled up to AVIN by R1. When
VOUT is between 90% and 120% of the
nominal regulation output voltage, POK will
be pulled high to AVIN; otherwise, the POK
pin is pulled low.
7) Soft Start Capacito r (C1) – Th e soft star t
capacitor is by defaulted 15nF and can be
adjusted to increase or decrease the soft-
start time. See the equation below.
Tss [s] = Css [F] * 75
The soft-start time (T ss) is in seconds and
the soft-start capacita nce (Css) is in Farad s .
See Datasheet for details.
8) Input Protection – The EN5365QI
evaluation board comes with some input
polar ity pr otection.
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10706 February 6, 2015 Rev C
EN5365Q I Ev aluation B oard
Evaluation Board Schematic
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EN5365Q I Ev aluation B oard
Bill of Materials
Qty
Description
1
15000PF 10% 50V SMD 0805 X7R CERAMIC CHI P CAPACITOR
1
CAPACI T OR, SMT ELECTROLYT IC , 150UF, 20%, 10V
1
TR AN SIEN T VOL TAGE SUPPR E SSOR, 6 .5 V , BID I REC TI O N AL , S M T
1
S2A DI ODE
1
RES 5.62K OHM 1/8W 1% 0805 SM D
1
COMPONENT NOT USED ** DO NOT I NST ALL **
1
CAP, 10UF, 0805, 10%, X5R
1
MULT I LAYER SMD FERRI T E BEAD 4000MA 0805
2
CAP, 47UF, 10V, X5R, 1210
5
COMPONENT NOT USED ** DO NOT I NST ALL **
1
EN5365QI QFN 6A PowerSoC with VID Output Voltage Select
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10706 February 6, 2015 Rev C
EN5365Q I Ev aluation B oard
Test Recommend atio ns
To guarantee m eas ur em ent ac c urac y, the follow ing prec autions s hould be obs er ved:
1. Make all input and output voltage measurements at the board using the test points provided
as this will eliminate voltage drop across the line and load cables that can produce false
readings.
2. Meas ure input and output c urrent with s eries am m eter s or ac c urate s hunt res is tors . This is
es pec ially im portant w hen m eas uring effic ienc y.
3. Use a low-loop-inductance scope probe tip similar to the one shown below to measure
switching signals and input / output ripple to avoid noise coupling into the probe ground
lead. Input ripple, output ripple, and load transient deviation are best measured near the
respective input / output capacitors. For more accurate ripple measurement, please see
Altera Enpirion App Note regarding this subject.
4. The boar d inc ludes a pull-up res is tor for the PO K s ignal and ready to m onitor the power O K
status at clip lead m arked PO K.
Contact Information
Altera Corporation
101 Innovation D rive
San Jos e, C A 95134
Phone: 408-544-7000
www.altera.com
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10706 February 6, 2015 Rev C