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參數(shù)資料
| 型號： | TC1222 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages |
| 中文描述： | 高頻開關(guān)電容電壓轉(zhuǎn)換器與關(guān)機采用SOT封裝 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 462K |
| 代理商： | TC1222 |
TC1221/TC1222
DS21367B-page 8
2002 Microchip Technology Inc.
4.9
Voltage Doubler/Inverter
Another common application of the TC1221/TC1222 is
shown in Figure 4-6. This circuit performs two functions
in combination. C1 and C2 form the standard inverter
circuit described above. C3 and C4 plus the two diodes
form the voltage doubler circuit. C1 and C3 are the
pump capacitors and C2 and C4 are the reservoir
capacitors. Because both sub-circuits rely on the same
switches if either output is loaded, both will droop
toward GND. Make sure that the total current drawn
from both the outputs does not total more than 40mA.
4.10
Diode Protection for Heavy Loads
When heavy loads require the OUT pin to sink large
currents being delivered by a positive source, diode
protection may be needed. The OUT pin should not be
allowed to be pulled above ground. This is
accomplished by connecting a Schottky diode
(1N5817) as shown in Figure 4-7.
4.11
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Noise leakage into other circuitry can be
minimized with the use of a large ground plane.
FIGURE 4-6:
COMBINED DOUBLER AND INVERTER
FIGURE 4-7:
HIGH V– LOAD CURRENT
C1
D1
D2
D1, D2 = 1N4148
6
4
1
2
3
C2
C4
C3
V
IN
V
OUT
= -V
IN
V
OUT
= (2V
IN
)
–
(V
FD1
)
–
(V
FD2
)
TC1221
TC1222
Shutdown
Control
5
+
+
+
+
TC1221
TC1222
GND
OUT
4
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1222ECH | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages |
| TC1222ECHTR | 功能描述:電荷泵 Hi Freq Switched CAP RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TC12-22SRWA | 制造商:Kingbright Corporation 功能描述: |
| TC12-22SYKWA | 制造商:Kingbright Corporation 功能描述: |
| TC1223 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50mA and 100mA CMOS LDOs with Shutdown |
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