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MCP16251 Datasheet(PDF) 15 Page - Microchip Technology

Part # MCP16251
Description  Low Quiescent Current, PFM/PWM Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP16251 Datasheet(HTML) 15 Page - Microchip Technology

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 2013 - 2016 Microchip Technology Inc.
DS20005173B-page 15
MCP16251/2
5.4
Output Capacitor Selection
The output capacitor helps provide a stable output
voltage during sudden load transients and reduces the
output voltage ripple. As with the input capacitor, X5R
and X7R ceramic capacitors are well suited for this
application. Using other capacitor types (aluminum or
tantalum) with large ESR has impact on the converter's
efficiency (see AN1337) and maximum output power.
The MCP16251/2 is internally compensated, so the
output capacitance range is limited. See Table 5-1 for
the recommended output capacitor range.
An output capacitance higher than 10 µF adds a better
load
step
response
and
high-frequency
noise
attenuation, especially while stepping from light current
loads (PFM mode) to heavy current loads (PWM
mode). A minimum of 20 µF output capacitance is
mandatory while the output drives load steps between
heavy load levels. In addition, 2 x 10 µF output
capacitors ensure a better recovery of the output after
a short period of overloading.
While the N-Channel switch is ON, the output current is
supplied by the output capacitor COUT. The amount of
output capacitance and equivalent series resistance
will have a significant effect on the output ripple
voltage. While COUT provides load current, a voltage
drop also appears across its internal ESR that results
in ripple voltage.
EQUATION 5-2:
Table 5-1 contains the recommended range for the
input and output capacitor values.
5.5
Inductor Selection
The MCP16251/2 is designed to be used with small
surface mount inductors; the inductance value can
range from 2.2 µH to 6.8 µH. An inductance value of
4.7 µH is recommended to achieve a good balance
between the inductor size, converter load transient
response and minimized noise.
TABLE 5-1:
CAPACITOR VALUE RANGE
CIN
COUT
Minimum
4.7 µF
10 µF
Maximum
none
47 µF
I
OUT
C
OUT
dV
dt
-------


=
Where:
dV = Ripple voltage
dt = ON time of the N-Channel switch
(D x 1/FSW, D is duty cycle)
TABLE 5-2:
MCP16251/2 RECOMMENDED
INDUCTORS
Part
Number
Value
(µH)
DCR
 (typ.)
ISAT
(A)
Size
WxLxH (mm)
Coiltronics®
SD3112
4.7
0.246
0.80
3.1x3.1x1.2
SD3114
4.7
0.251
1.14
3.1x3.1x1.4
SD3118
4.7
0.162
1.31
3.8x3.8x1.2
SD25
4.7
0.0467
1.83
5.0x5.0x2.5
Wurth Elektronik
WE-TPC
Type Tiny
4.7
0.100
1.7
2.8x2.8x2.8
WE-TPC
Type TH
4.7
0.200
0.8
2.8x2.8x1.35
WE-TPC
Type S
4.7
0.105
0.90
3.8x3.8x1.65
WE-TPC
Type M
4.7
0.082
1.65
4.8x4.8x1.8
Sumida Corporation
CMD4D06
4.7
0.216
0.75
3.5x4.3x2
CDRH4D
4.7
0.09
0.800
4.6x4.6x1.5
Coilcraft
XPL2010
4.7
0.336
0.75
1.9x2x1.0
ME3220
4.7
0.190
1.5
2.5x3.2x2.0
XFL3010
4.7
0.217
1.1
3x3x1.0
XFL3012
4.7
0.143
1.0
3x3x1.2
EPL3012
4.7
0.165
1.0
3x3x1.3
LPS4018
4.7
0.125
1.8
4x4x1.8
XFL4020
4.7
0.052
2.0
4x4x2.1
TDK Corporation
VLS3015ET
-4R7M
4.7
0.113
1.1
3x3x1.5
B82462
G4472M
4.7
0.04
1.8
6x6x3
B82462
A4472M
4.7
0.08
2.8
6x6x3


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