TC7660EV 查看數據表（PDF） - TelCom Semiconductor Inc => Microchip
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TC7660EV Datasheet PDF : 7 Pages
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+5V TO ±10V VOLTAGE CONVERTER
1
Table 1. ROUT vs. C1 ,C2
C1, C2 (µF)
0.1
0.47
1
3.3
4.7
10
22
100
ROUT (Ω)
1089
339
232
165
157
146
141
137
Table 2. VRIPPLE (p-p) vs. C3, C4 (IOUT = 10mA)
C3, C4 (µF)
VRIPPLE (mV)
0.47
1540
1
734
3.3
236
4.7
172
10
91
22
52
100
27
TCM680
Paralleling Devices
2 Paralleling multiple TCM680s reduces the output resis-
tance of both the positive and negative converters. The
effective output resistance is the output resistance of a
single device divided by the number of devices. As illus-
trated in Figure 7, each requires separate pump capacitors
C1 and C2, but all can share a single set of reservoir
capacitors.
±5V Regulated Supplies From A Single
3V Battery
3
Figure 8 shows a complete ±5V power supply using one
3V battery. The TCM680 provides +6V at V+OUT, which is
regulated to +5V by the TC55, and –5V by the negative LDO.
The input to the TCM680 can vary from 3V to 6V without
affecting regulation appreciably. With higher input voltage,
4 more current can be drawn from the outputs of the TCM680.
With 5V at VIN, 10mA can be drawn from both regulated
outputs simultaneously. Assuming 150Ω source resistance
for both converters, with (I+L + IL) = 20mA, the positive charge
pump will droop 3V, providing +7V for the negative charge
pump.
5
VIN
+
10µF
–
+
10µF
–
GND
C1+
VIN
C1–
TCM680
C2+
C2– GND
VO–UT
+
10µF
–
+
10µF
–
C1+
VIN
C1–
TCM680
C2+
C2– GND
VO–UT
6
NEGATIVE
SUPPLY
–
+ CO–UT 22µF
7
Figure 7. Paralleling TCM680 for Lower Output Source Resistance
TELCOM SEMICONDUCTOR, INC.
8
4-17
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