TC7660 데이터 시트보기 (PDF) - TelCom Semiconductor Inc => Microchip
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TC7660 Datasheet PDF : 9 Pages
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CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
1
TC7660
C1 +
10µF
VOUT = –V–
1
8
2
7
1 MΩ
3 TC7660 6
+
10µF
4
5
V– INPUT
Figure 10. Positive Voltage Conversion
Voltage Splitting
The same bidirectional characteristics used in Figure 10
can also be used to split a higher supply in half, as shown in
Figure 11. The combined load will be evenly shared be-
tween the two sides. Once again, a high value resistor to the
LV pin ensures start-up. Because the switches share the
load in parallel, the output impedance is much lower than in
the standard circuits, and higher currents can be drawn from
the device. By using this circuit, and then the circuit of Figure
5, +15V can be converted (via +7.5V and –7.5V) to a nominal
–15V, though with rather high series resistance (~250Ω).
+
RL1
50 µF
VOUT =
V + –V –
2
RL2
50 µF
+
–
100 kΩ
+
50 µF
–
V+
1
8
2
7
1 MΩ
3 TC7660 6
4
5
V–
2
3
Figure 11. Splitting a Supply in Half
4
5
6
7
TELCOM SEMICONDUCTOR, INC.
8
4-59
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