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TC660EPA Fiches technique(PDF) 6 Page - TelCom Semiconductor, Inc

No de pièce TC660EPA
Description  100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
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Fabricant  TELCOM [TelCom Semiconductor, Inc]
Site Internet  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC660EPA Fiches technique(HTML) 6 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
TC660
100mA CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 6.5
Ω.
Thus, for a load current of –100mA and a supply voltage of
+5V, the output voltage would be – 4.35V.
The dynamic output impedance of the TC660 is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C1). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
Paralleling Devices
Any number of TC660 voltage converters may be paral-
leled to reduce output resistance (Figure 4). The reservoir
capacitor, C2, serves all devices, while each device requires
its own pump capacitor, C1. The resultant output resistance
would be approximately:
2
2
πf C1
XC =
= 0.21
Ω,
where f = 10 kHz and C1 = 150 µF.
Figure 4. Paralleling Devices Lowers Output Impedance
Dos and Don'ts
• Do not exceed maximum supply voltages.
• Do not connect the LV terminal to GND for supply
voltages greater than 3.0V.
• Do not short circuit the output to V
+ in inverting mode
and for more than 10 sec (a very slow startup!) in
doubler mode.
• When using polarized capacitors in the inverting mode,
the + terminal of C1 must be connected to pin 2 of the
TC660 and the + terminal of C2 must be connected to
GND.
Simple Negative Voltage Converter
Figure 3 shows typical connections to provide a nega-
tive supply where a positive supply is available. A similar
scheme may be employed for supply voltages anywhere in
the operating range of +1.5V to +5.5V, keeping in mind that
pin 6 (LV) is tied to the supply negative (GND) only for supply
voltages below 3.0V.
ROUT (of TC660)
n (number of devices)
ROUT =
Figure 3. Simple Negative Converter
1
2
3
4
8
7
6
5
TC660
150 µF
+
V
+
150 µF
+
VOUT*
1. VOUT = –V
+
for 1.5V
≤ V+ ≤ 5.5V
NOTES:
*
C1
C2
1
2
3
4
8
7
6
5
TC660
V
+
1
2
3
4
8
7
6
5
TC660
C1
RL
C2
C1
"n"
"1"
+


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