SUPER CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660S
V
+
R
L1
50µF
+
1
VOUT
1
2
C1
10µF
4
5
+
3
8
7
= –V–
1
2
+
–
100 kΩ
8
7
1 MΩ
2
3
+
1 MΩ
10µF
V
TC7660S
=
OUT
+
–
V –V
2
50µF
3
4
TC7660S
6
5
6
R
L2
V– INPUT
+
50µF
–
V
–
Figure 10. Positive Voltage Multiplier
Figure 11. Splitting a Supply in Half
TYPICAL CHARACTERISTICS
Unloaded Osc Freq vs. Temperature
12
OSCILLATOR FREQUENCY (kHz)
60
OSCILLATOR FREQUENCY (kHz)
Unloaded Osc Freq vs. Temperature
with Boost Pin = V
IN
4
5
100
10
8
6
4
V
IN
= 12V
2
0
-40
-20
0
20
40
60
80
100
V
IN
= 5V
50
40
30
V
IN
= 12V
20
10
0
-40
-20
0
20
40
60
80
V
IN
= 5V
TEMPERATURE (°C)
TEMPERATURE (°C)
6
7
1000
800
600
I
DD
(µA)
VOLTAGE CONVERSION EFFICIENCY (%)
Supply Current vs. Temperature
(with Boost Pin = V
IN
)
Voltage Conversion
101.0
100.5
100.0
99.5
99.0
98.5
T
A
= 25°C
98.0
1
2
3
4
5
6
7
8
9
10 11 12
INPUT VOLTAGE V
IN
(V)
Without Load
V
IN
= 12V
400
200
0
-40
10K Load
V
IN
= 5V
-20
0
20
40
60
80
100
TEMPERATURE (°C)
8
TELCOM SEMICONDUCTOR, INC.
4-75
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
