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| 型号： | MCP1640EV-SBC |
| 厂商： | Microchip Technology |
| 文件页数： | 15/32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
5.0
APPLICATION INFORMATION
5.3
Input Capacitor Selection
5.1
Typical Applications
The boost input current is smoothed by the boost
inductor reducing the amount of filtering necessary at
The MCP1640/B/C/D synchronous boost regulator
operates over a wide input and output voltage range.
The power efficiency is high for several decades of load
range. Output current capability increases with input
voltage and decreases with increasing output voltage.
The maximum output current is based on the N-Chan-
nel peak current limit. Typical characterization curves in
this data sheet are presented to display the typical out-
put current capability.
the input. Some capacitance is recommended to
provide decoupling from the source. Low ESR X5R or
X7R are well suited since they have a low temperature
coefficient and small size. For most applications,
4.7 μF of capacitance is sufficient at the input. For high
power applications that have high source impedance or
long leads, connecting the battery to the input 10 μF of
capacitance is recommended. Additional input
capacitance can be added to provide a stable input
voltage.
5.2
Adjustable Output Voltage
Calculations
input capacitor value.
To calculate the resistor divider values for the
MCP1640/B/C/D, the following equation can be used.
5.4
Output Capacitor Selection
Where R TOP is connected to V OUT , R BOT is connected
to GND and both are connected to the FB input pin.
EQUATION 5-1:
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.
? VOUT ?
? ?
FB
R
TOP
= R
BOT
? ? ---------------- – 1 ?
V
The MCP1640/B/C/D is internally compensated so
output capacitance range is limited. See Table 5-1 for
the recommended output capacitor range.
Example A:
V OUT = 3.3V
V FB = 1.21V
R BOT = 309 k ?
R TOP = 533.7 k ? (Standard Value = 536 k ? )
Example B:
V OUT = 5.0V
While the N-Channel switch is on, the output current is
supplied by the output capacitor C OUT . The amount of
output capacitance and equivalent series resistance
will have a significant effect on the output ripple
voltage. While C OUT provides load current, a voltage
drop also appears across its internal ESR that results
in ripple voltage.
EQUATION 5-2:
? ? ------- ?
V FB = 1.21V
R BOT = 309 k ?
I
OUT
= C
OUT
dV
? dt ?
R TOP = 967.9 k ? (Standard Value = 976 k ? )
There are some potential issues with higher value
resistors. For small surface mount resistors,
environment contamination can create leakage paths
that significantly change the resistor divider that effect
the output voltage. The FB input leakage current can
also impact the divider and change the output voltage
Where dV represents the ripple voltage and dt
represents the ON time of the N-Channel switch (D * 1/
F SW ).
input and output capacitor value.
tolerance.
TABLE 5-1:
CAPACITOR VALUE RANGE
C IN
C OUT
? 2011 Microchip Technology Inc.
Min
Max
4.7 μF
none
10 μF
100 μF
DS22234B-page 15
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