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TC1221 bảng dữ liệu(PDF) 7 Page - Microchip Technology

tên linh kiện TC1221
Giải thích chi tiết về linh kiện  High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages
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TC1221 bảng dữ liệu(HTML) 7 Page - Microchip Technology

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 2002 Microchip Technology Inc.
DS21367B-page 7
TC1221/TC1222
4.7
Cascading Devices
Two or more TC1221/TC1222 can be cascaded to
increase output voltage (Figure 4-4). If the output is
lightly loaded, it will be close to (-2 x VIN) but will droop
at least by ROUT of the first device multiplied by the IQ
of the second. It can be seen that the output resistance
rises rapidly for multiple cascaded devices.
4.8
Paralleling Devices
To reduce the value of ROUT, multiple TC1221/
TC1222’s can be connected in parallel (Figure 4-5).
The output resistance will be reduced by a factor of N
where N is the number of TC1221/TC1222. Each
device will require its own pump capacitor (C1), but all
devices may share one reservoir capacitor (C2).
However, to preserve ripple performance the value of
C2 should be scaled according to the number of
paralleled TC1221/TC1222.
FIGURE 4-4:
CASCADING MULTIPLE DEVICES TO INCREASE OUTPUT VOLTAGE
FIGURE 4-5:
PARALLELING MULTIPLE DEVICES TO REDUCE OUTPUT RESISTANCE
C1
C1
C2
6
6
4
3
4
1
2
2
1
3
C2
VIN
VOUT
VOUT =-nVIN
TC1221
TC1222
TC1221
TC1222
...
...
SHDN
SHDN
VIN
5
5
"1"
"n"
+
+
+
+
C1
C1
6
5
4
3
4
1
2
2
1
3
C2
VOUT
VOUT =-VIN
ROUT = ROUT OF SINGLE DEVICE
VIN
NUMBER OF DEVICES
TC1221
TC1222
TC1221
TC1222
...
...
SHDN
SHDN
Shutdown
Control
5
6
VIN
+
+
+
"1"
"n"



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