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| 型号： | MCP1640EV-SBC |
| 厂商： | Microchip Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP1640 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 2V，3.3V 或 5V |
| 电流 - 输出： | 100mA，350mA |
| 输入电压： | 0.35 ~ 5.5V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP1640 |
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MCP1640/B/C/D
5.5
Inductor Selection
Several parameters are used to select the correct
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.
inductor: maximum rated current, saturation current
and copper resistance (ESR). For boost converters, the
inductor current can be much higher than the output
current. The lower the inductor ESR, the higher the
efficiency of the converter, a common trade-off in size
versus efficiency.
TABLE 5-2:
MCP1640/B/C/D
RECOMMENDED INDUCTORS
Peak current is the maximum or limit, and saturation
current typically specifies a point at which the induc-
tance has rolled off a percentage of the rated value.
Part Number
Coilcraft ?
EPL2014-472
Value
(μH)
4.7
DCR
? (typ)
0.23
I SAT
(A)
1.06
Size
WxLxH
(mm)
2.0x2.0x1.4
This can range from a 20% to 40% reduction in induc-
tance. As inductance rolls off, the inductor ripple cur-
rent 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.
EPL3012-472
4.7
0.165
1.1
3.0x3.0x1.3
5.6
Thermal Calculations
MSS4020-472
LPS6225-472
4.7
4.7
0.115
0.065
1.5
3.2
4.0x4.0x2.0
6.0x6.0x2.4
The MCP1640/B/C/D is available in two different
packages, 6-Lead SOT23 and 8-Lead 2x3 DFN. By cal-
Coiltronics ?
culating the power dissipation and applying the pack-
SD3110
SD3112
SD3114
SD3118
SD3812
SD25
Part Number
4.7
4.7
4.7
4.7
4.7
4.7
Value
(μH)
0.285
0.246
0.251
0.162
0.256
0.0467
DCR
?
(max)
0.68
0.80
1.14
1.31
1.13
1.83
I SAT
(A)
3.1x3.1x1.0
3.1x3.1x1.2
3.1x3.1x1.4
3.8x3.8x1.2
3.8x3.8x1.2
5.0x5.0x2.5
Size
WxLxH
(mm)
age thermal resistance, ( ? JA ), the junction temperature
is estimated. The maximum continuous junction
temperature rating for the MCP1640/B/C/D is +125 o C.
To quickly estimate the internal power dissipation for
the switching boost regulator, an empirical calculation
using measured efficiency can be used. Given the
measured efficiency, the internal power dissipation is
EQUATION 5-3:
? ------------------------------------- ? – ? V
V ? I
Wurth Elektronik ?
WE-TPC Type 4.7
TH
0.200
0.8
2.8x2.8x1.35
OUT OUT
? Efficiency ?
OUT
? I
OUT
? = P
Dis
WE-TPC Type
4.7
0.105
0.90
3.8x3.8x1.65
S
WE-TPC Type
4.7
0.082
1.65
4.8x4.8x1.8
The difference between the first term – input power,
M
and the second term – power delivered, is the internal
WE-TPC Type
X
Part Number
Sumida ?
CMH23
4.7
Value
(μH)
4.7
0.046
DCR
?
(max)
0.537
2.00
I SAT
(A)
0.70
6.8x6.8x2.3
Size
WxLxH
(mm)
2.3x2.3x1.0
MCP1640/B/C/D power dissipation. This is an esti-
mate, assuming that most of the power lost is internal
to the MCP1640/B/C/D and not C IN , C OUT and the
inductor. There is some percentage of power lost in the
boost inductor, with very little loss in the input and out-
put capacitors. For a more accurate estimation of inter-
nal power dissipation, subtract the I INRMS2 *L ESR power
dissipation.
CMD4D06
4.7
0.216
0.75
3.5x4.3x0.8
5.7
PCB Layout Information
CDRH4D
EPCOS ?
B82462A2472
4.7
4.7
0.09
0.084
0.800
2.00
4.6x4.6x1.5
6.0x6.0x2.5
Good printed circuit board layout techniques are
important to any switching circuitry; and, switching
power supplies are no different. When wiring the
M000
switching high current paths, short and wide traces
B82462G4472
4.7
0.04
1.8
6.3x6.3x3.0
should be used. Therefore it is important that the input
M
DS22234B-page 16
and output capacitors be placed as close as possible to
the MCP1640/B/C/D to minimize the loop area.
? 2011 Microchip Technology Inc.
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