Charge Pump DC-TO-DC Voltage Converter
TC1044S
VOUT = –V–
RL1
50
µF
V+
+
1
2
100
kΩ
3
100
kΩ
+
V–
4
8
7
1 MΩ
6
5
1
2
C1
10µF
+
3
4
8
7
1 MΩ
6
5
V– INPUT
+
10µF
TC1044S
VOUT = +
V + –V –
50
2
µF
RL2
TC1044S
50
µF
Figure 10. Positive Voltage Conversion
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
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
100
V
IN
= 5V
TEMPERATURE (°C)
TEMPERATURE (°C)
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
TC1044S-12 9/16/96
Without Load
V
IN
= 12V
400
200
0
-40
10K Load
V
IN
= 5V
-20
0
20
DS21348A
40
60
80
100
7
TEMPERATURE (°C)
© 2001 Microchip Technology Inc.
INPUT VOLTAGE V
IN
(V)
MICROCHIP [ MICROCHIP TECHNOLOGY ]
