Datasheet

7
TC1044S
Charge Pump DC-TO-DC Voltage Converter
TC1044S-12 9/16/96
© 2001 Microchip Technology Inc. DS21348A
Figure 10. Positive Voltage Conversion
1
2
3
4
8
7
6
5
+
V
OUT
= –V
–
10µF
+
1 MΩ
V
–
INPUT
C
1
10µF
TC1044S
Figure 11. Splitting a Supply in Half
+
+
R
L1
R
L2
V
OUT
=
V
+
–V
–
2
50
µF
100
kΩ
100
kΩ
50
µF
V
+
V
–
50 µF
+
1 MΩ
1
2
8
7
TC1044S
3
4
6
5
TYPICAL CHARACTERISTICS
Unloaded Osc Freq vs. Temperature
12
10
0
2
4
6
8
-40 -20 0 20 40 10060 80
OSCILLATOR FREQUENCY (kHz)
TEMPERATURE (°C)
V
IN
= 12V
V
IN
= 5V
Unloaded Osc Freq vs. Temperature
with Boost Pin = V
IN
60
50
0
10
20
30
40
-40 -20 0 20 40 10060 80
OSCILLATOR FREQUENCY (kHz)
TEMPERATURE (°C)
V
IN
= 12V
V
IN
= 5V
Supply Current vs. Temperature
(with Boost Pin = V
IN
)
1000
0
200
400
600
800
-40 -20 0 20 40 10060 80
I
DD
(µA)
TEMPERATURE (°C)
V
IN
= 12V
Without Load
10K Load
Voltage Conversion
101.0
100.5
100.0
99.5
99.0
98.5
98.0
112111098756423
VOLTAGE CONVERSION EFFICIENCY (%)
INPUT VOLTAGE V
IN
(V)
T
A
= 25°C
V
IN
= 5V