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MCP1640T-ICHY Datasheet(PDF) 16 Page - Microchip Technology

Part No. MCP1640T-ICHY
Description  0.65V Start-Up 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

MCP1640T-ICHY Datasheet(HTML) 16 Page - Microchip Technology

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MCP1640/B/C/D
DS20002234D-page 16
 2010-2015 Microchip Technology Inc.
The MCP1640/B/C/D is internally compensated, so
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, espe-
cially while stepping from light current loads (PFM
mode) to heavy current loads (PWM mode). Over-
shoots and undershoots during pulse load application
are reduced by adding a zero in the compensation
loop. A small capacitance (for example 100 pF) in par-
allel with an upper feedback resistor will reduce output
spikes, especially in PFM mode.
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 value.
5.5
Inductor Selection
The MCP1640/B/C/D is designed to be used with small
surface-mount inductors; the inductance value can
range from 2.2 µH to 10 µH. An inductance value of
4.7 µH is recommended to achieve a good balance
between
inductor
size,
converter
load
transient
response and minimized noise.
Several parameters are used to select the correct
inductor: maximum rated current, saturation current
and copper resistance (ESR). For boost converters, the
inductor current is much higher than the output current;
the average of the inductor current is equal to the input
current drawn from the input. The lower the inductor
ESR, the higher the efficiency of the converter. This is
a common trade-off in size versus efficiency.
Peak current is the maximum or the limit, and
saturation current typically specifies a point at which
the inductance has rolled off a percentage of the rated
value. This can range from a 20% to 40% reduction in
inductance. As inductance rolls off, the inductor ripple
current increases; as does the peak switch current. It is
important to keep the inductance from rolling off too
much, causing switch current to reach the peak limit.
TABLE 5-1:
CAPACITOR VALUE RANGE
CIN
COUT
Min.
4.7 µF
10 µF
Max.
100 µF
I
OUT
C
OUT
dV
dt
-------


=
Where:
dV = ripple voltage
dt = On time of the N-Channel switch
(D x 1/FSW)
TABLE 5-2:
MCP1640/B/C/D
RECOMMENDED INDUCTORS
Part Number
Size
WxLxH
(mm)
Coilcraft
EPL2014-472
4.7
0.23
1.06
2.0x2.0x1.4
EPL3012-472
4.7
0.165
1.1
3.0x3.0x1.3
MSS4020-472
4.7
0.115
1.5
4.0x4.0x2.0
LPS6225-472
4.7
0.065
3.2
6.0x6.0x2.4
Coiltronics®
SD3110
4.7
0.285
0.68
3.1x3.1x1.0
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
SD3812
4.7
0.256
1.13
3.8x3.8x1.2
SD25
4.7
0.0467
1.83
5.0x5.0x2.5
Würth Elektronik®
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
WE-TPC Type X
4.7
0.046
2.00
6.8x6.8x2.3
Sumida Corporation
CMH23
4.7
0.537
0.70
2.3x2.3x1.0
CMD4D06
4.7
0.216
0.75
3.5x4.3x0.8
CDRH4D
4.7
0.09
0.800
4.6x4.6x1.5
TDK-EPCOS
B82462A2472M000
4.7
0.084
2.00
6.0x6.0x2.5
B82462G4472M
4.7
0.04
1.8
6.3x6.3x3.0


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