DatasheetQ Logo
Electronic component search and free download site. Transistors,MosFET ,Diode,Integrated circuits

TC660EOA データシートの表示(PDF) - TelCom Semiconductor, Inc

部品番号
コンポーネント説明
メーカー
TC660EOA
TELCOM
TelCom Semiconductor, Inc TELCOM
TC660EOA Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
100mA CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC660
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.
V+
C1 +
150 µF
1
8
2
7
3 TC660 6
4
5
VOUT*
C2
+ 150 µF
*NOTES: 1. VOUT = –V+ for 1.5V V+ 5.5V
Figure 3. Simple Negative Converter
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 6.5.
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:
2
XC = 2πf C1 = 0.21Ω,
where f = 10 kHz and C1 = 150 µF.
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:
ROUT =
ROUT (of TC660)
n (number of devices)
V+
1
8
2
7
C1
TC660
3
6
4
"1"
5
1
8
2
7
RL
C1
3 TC660 6
4
"n"
5
+ C2
Figure 4. Paralleling Devices Lowers Output Impedance
4-10
TELCOM SEMICONDUCTOR, INC.

Share Link: 

datasheetq.com  [ Privacy Policy ]Request Datasheet ] [ Contact Us ]