TC7660H View Datasheet(PDF) - TelCom Semiconductor Inc => Microchip
Part Name
Description
Manufacturer
TC7660H Datasheet PDF : 6 Pages
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HIGH FREQUENCY 7660 DC-TO-DC
VOLTAGE CONVERTER
TC7660H
Efficient Positive Voltage Multiplication/
Conversion
Since the switches that allow the charge pumping op-
eration are bidirectional, the charge transfer can be per-
formed backwards as easily as forwards. Figure 9 shows a
TC7660H transforming – 5V to +5V (or +5V to +10V, etc.).
The only problem here is that the internal clock and switch-
drive section will not operate until some positive voltage has
been generated. An initial inefficient pump, as shown in
Figure 9, could be used to start this circuit up, after which it
will bypass the diode and resistor shown dotted in
Figure 9.
C1 +
1.0 µF
VOUT = –V–
1
8
2
7
3 TC7660H 6
4
5
1 MΩ
V– INPUT
+
1.0 µF
Figure 9. Positive Voltage Conversion
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1)
Output Source Resistance vs. Supply Voltage
10k
TA = +25°C
Output Source Resistance vs. Temperature
500
IOUT = 1 mA
450
400
1k
200
100Ω
150
V + = +2V
100
V + = +5V
50
10Ω
0
12 34 5 678
SUPPLY VOLTAGE (V)
0
–55 –25
0 +25 +50 +75 +100 +125
TEMPERATURE (°C)
Output Voltage vs. Output Current
CI C2 =1µF
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
TA = +25°C
LV OPEN
–10
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
4-68
Output Voltage vs. Load Current
5
4
TA = +25°C
V+ = +5V
3
2
1
0
–1
–2
–3
–4
SLOPE 55Ω
–5
0 10 20 30 40 50 60 70 80
LOAD CURRENT (mA)
TELCOM SEMICONDUCTOR, INC.
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