Enpirion® Power Evaluation Board User Guide
EN5335QI PowerSoC
Enpirion EN5335QI 3A DCDC Converter
w/Int egrated Induc tor Eval uati on Board
Introduction
Thank you for c hoos ing Alter a Enpir ion power produc ts !
You ar e evaluating a c om plete pow er system on silicon:
• The EN5335QI features integrated inductor, power MOSFETS, Gate
Drive, C om pens ation Network, and c ontroller and protec tion c ir c uitry. This
level of integration delivers a substantial reduction in footprint and part
c ount over c om peting solutions.
• The EN5335Q I featur es a 3 pin VID output voltage s elec tor and requires
only c eram ic input and output c apac itors , and a s m all c apac itor for s oft -
s tar t program m ing. The 3 pin VID allow s the us er to c hoos e fr om one of
s even predefined output voltage settings.
• The input c apac itor is a 10V r ated 22uF X5R MLC C and the output
c apac itor is a 6.3V r ated 47uF X5R MLCC . The Soft-s tart c apac itor is a
s m all 10V rated 15nF X5R MLC C.
• Pads are available to add up to one additional input c apac itor and up to
four additional output c apac itors to allow for evaluation of per form anc e
over a w ide range of input/output c apac itor c om binations .
• Eas y jum pers are provided for the follow ing s ignals :
o Enable
o VS0-VS2 output voltage select
• Num erous tes t points ar e provided as w ell as c lip leads for input and
output connections
• The board c om es with input dec oupling and revers e polarity protec tion to
protec t the devic e from c om m on s etup m is haps .
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Enpirion® Power Evaluation Board User Guide
EN5335QI PowerSoC
Quick Start Guide
Figure 1 shows a top view of the evaluation board.
WARNING: c om plete s teps 1 through 4 before applying power
to the EN5335Q I evaluation boar d.
STEP 1: S et the “ENA” jum per to the D is able Pos ition.
STEP 2: S et the output voltage s elec t pins for the des ir ed output voltage s etting.
Refer to the s ec tion on output voltage s elec t to
determ ine the s etting.
CAUTION: Voltage s elec t pins MUST NOT be
c hanged w hile the EN5335Q I is enabled.
Doing s o w ill res ult in dam age to the par t.
STEP 3: C onnec t Pow er Supply to the input pow er c onnec tors , VIN (+ ) and
GND (-) as indicated in Figure 1.
CAUTION: be m indful of the polarity. E ven though the evaluation board
c om es w ith revers e polar ity protec tion diodes , it is rarely a good idea to
revers e the input polar ity.
STEP 4: C onnec t the load to the output c onnectors VO UT ( +) and GND (-), as
indicated in Figure 1.
STEP 5: Pow er up the boar d and m ove the E NA jum per to the enabled pos ition.
The EN5335Q I is now power ed up.
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Enpirion® Power Evaluation Board User Guide
EN5335QI PowerSoC
Figure 1. E val uat io n B oar d La yout .
Output Voltage Select
The EN5335Q I utiliz es a 3 pin
output voltage s elec tor. The output
voltage is pr ogram m ed by s etting
the V Sx jumpers to either a logic
“1” or a logic “0” as des c ribed in the
Q uic k Star t s ec tion. The voltage
s elec t pins are pulled up internally
and s o w ill default to a logic “1” if
left open.
Table 1 shows the truth table for
VOUT s elec tion. Ther e are s even
preset output voltage levels which
c an be c hos en via the VS x jum per s .
WARNING: Voltage s elec t pins m us t not be adjus ted w hile part is enabled.
Doing s o w ill res ult in dam age to the par t. Alw ays dis able par t when c hanging
output voltage setting.
Table 1. Out put Volta ge Selec t Trut h Tabl e
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Enpirion® Power Evaluation Board User Guide
EN5335QI PowerSoC
Test Recommend atio ns
Recommendations
To guarantee m eas ur em ent ac c urac y, the follow ing prec autions s hould be
observed:
1. Make all input and output voltage m eas urem ents at the board us ing the
tes t points provided. This w ill elim inate voltage drop ac ros s the line and
load c ables that c an produc e fals e r eadings .
2. Meas ur e input and output c ur rent w ith series ammeters or accurate
shunt resistors. This is especially important when measuring efficiency.
3. Us e a balanc ed im pedanc e pr obe tip to m eas ure s w itc hing s ignals to
avoid noise coupling into the probe ground lead.
Input and Output Capacitors
The input c apac itanc e requirem ent is 22 uF for the EN5335Q I. Altera
rec om m ends that a low ES R MLC C c apac itor be us ed. The voltage rating s hould
rated high enough to provide adequate m argin for your applic ation. Ther e is a
pre-tinned pad for one additional 1210 c apac itor to experim ent with input filter
performance.
The output c apac itanc e requirem ent is approxim ately 50uF of c apac itanc e and
c om es populated w ith a 47uF 1210 6.3V MLC C. The boar d has pre-tinned pads
for up to 4 additional output c apac itors w ith 1210 or 1206 footprint. Various
c om binations of output c apac itor c an be us ed to reduc e effec tive s er ies
resistance.
NOTE: Capac itors m us t be X5R or X7R dielec tric form ulations .
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Enpirion® Power Evaluation Board User Guide
EN5335QI PowerSoC
Contact Information
Altera Corporation
101 Innovation Drive
San Jos e, CA 95134
Phone: 408-544-7000
www.altera.com
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