CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
1
2
3
4
5
6
7
8
TC1044S
+
V
–
V
= –V
OUT
+
R
50 µF
L1
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
V
=
–
+
+
OUT
1 MΩ
10µF
+
V
–V
2
TC1044S
50
µF
100
kΩ
1 MΩ
+
C
100
kΩ
1
TC1044S
R
L2
10µF
+
50
µF
–
V
INPUT
–
V
Figure 11. Splitting a Supply in Half
Figure 10. Positive Voltage Conversion
TYPICAL CHARACTERISTICS
Unloaded Osc Freq vs. Temperature
Unloaded Osc Freq vs. Temperature
with Boost Pin = V
IN
12
10
8
60
50
40
30
20
10
0
VIN = 5V
VIN = 12V
VIN = 5V
6
4
VIN = 12V
2
0
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Supply Current vs. Temperature
(with Boost Pin = V )
Voltage Conversion
IN
1000
800
600
400
200
0
101.0
100.5
100.0
99.5
Without Load
10K Load
VIN = 12V
99.0
98.5
VIN = 5V
80
TA = 25°C
98.0
-40
-20
0
20
40
60
100
1
2
3
4
5
6
7
8
9
10 11 12
TEMPERATURE (°C)
INPUT VOLTAGE VIN (V)
TELCOM SEMICONDUCTOR, INC.
4-49
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
