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XRP6670EVB Datasheet(PDF) 9 Page - Exar Corporation

Part # XRP6670EVB
Description  3A 300kHz-2.5MHz Synchronous Step Down Regulator
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6670EVB Datasheet(HTML) 9 Page - Exar Corporation

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X
XR
RP
P6
66
67
70
0
3
3A
A 3
30
00
0k
kH
Hz
z-
-2
2..5
5M
MH
Hz
z S
Sy
yn
nc
ch
hr
ro
on
no
ou
us
s S
Stte
ep
p D
Do
ow
wn
n R
Re
eg
gu
ulla
atto
or
r
© 2013 Exar Corporation
9/13
Rev. 1.0.1
voltages. Note that example inductors shown
in tables 3 and 4 are Wurth shielded inductors.
VOUT(V) ∆IL(p-p)(A)
L(µH)
Inductor
Example
3.3
0.76
1.5
74437346015
2.8
0.81
1.5
74437346015
2.5
0.84
1.5
74437346015
1.8
0.76
1.5
74437346015
1.5
0.70
1.5
74437346015
1.2
0.62
1.5
74437346015
1.1
0.57
1.5
74437346015
Table 3: Suggested Inductor Values
for f=1MHz, VIN=5V and IOUT=2.7A
VOUT(V) ∆IL(p-p)(A)
L(µH)
Inductor
Example
2.5
0.41
1.5
74437346015
1.8
0.54
1.5
74437346015
1.5
0.54
1.5
74437346015
1.2
0.51
1.5
74437346015
1.1
0.49
1.5
74437346015
Table 4: Suggested Inductor Values
for f=1MHz, VIN=3.3V and IOUT=2.7A
OUTPUT CAPACITOR COUT
Select the output capacitor for voltage rating,
capacitance
COUT
and
Equivalent
Series
Resistance ESR. The voltage rating, as a rule
of thumb, should be at least twice the output
voltage.
When
calculating
the
required
capacitance,
usually
the
overriding
requirement is current load-step transient. If
the
unloading
transient
(i.e.,
when
load
transitions from a high to a low current) is
met, then usually the loading transient (when
load transitions from a low to a high current)
is met as well. Therefore calculate the COUT
based on the unloading transient requirement
from:
'
(
")*+,- "#./-
0 1234%*541 -
-6
Where:
L is the inductance calculated in the preceding
step
IHigh
is
the
value
of
load-step
prior
to
unloading. This is nominally set equal to
regulator current rating (3A).
ILow is the value of load-step after unloading.
This is nominally set equal to 50% of regulator
current rating (1.5A).
Vtransient is the maximum permissible voltage
transient
corresponding
to
the
load
step
mentioned above. Vtransient is typically specified
from 3% to 5% of VOUT.
ESR of the capacitor has to be selected such
that the output voltage ripple requirement
∆VOUT, nominally 1% of VOUT, is met. Voltage
ripple
∆VOUT is mainly composed of two
components: the resistive ripple due to ESR
and capacitive ripple due to COUT charge
transfer. For applications requiring low voltage
ripple, ceramic capacitors are recommended
because of their low ESR which is typically in
the range of 5mΩ. Therefore ∆VOUT is mainly
capacitive. For ceramic capacitors calculate
the ∆VOUT from:
!
!"#
8 '
$%
Where:
∆IL is from table 2 or 3
COUT is the value calculated above
fs is nominal switching frequency
If tantalum or electrolytic capacitors are used
then ∆VOUT is essentially a function of ESR:
!
!"# 78
INPUT CAPACITOR CIN
Select the input capacitor for voltage rating,
RMS
current
rating
and
capacitance.
The
voltage rating should be at least 50% higher
than the regulator’s maximum input voltage.
Calculate the capacitor’s current rating from:
"9 ,;<= "
>? 1 ?
Where:
IOUT is regulator’s maximum current (3A)
D is duty cycle (D=VOUT/VIN)
Calculate the CIN capacitance from:
' " $% - !


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