Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240
TYPICAL CHARACTERISTICS
Supply Current vs. Supply Voltage
(No Load)
Supply Current vs. Temperature
(No Load)
700
450
400
350
300
250
200
150
100
50
600
500
400
300
200
100
0
VIN = 4.0V
VIN = 2.8V
2.00
3.00
4.00
5.00
6.00
0
-50
-25
0
25
50
75
100
125
Supply Voltage (V)
Temperature (°C)
Output Source Resistance vs. Temperature
(with Rload = 1K)
Output Source Resistance vs. Supply Voltage
(with Rload = 1K)
25
20
20
15
10
5
15
10
5
VIN = 2.8V
VIN = 4.0V
0
0
2.00
3.00
4.00
5.00
6.00
-50
-25
0
25
50
75
100
125
Supply Voltage (V)
Temperature (°C)
Power Efficiency Vs Load Current
Output Voltage Drop Vs Load Current
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
1
VIN = 4.0V
VIN = 3.5V
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
VIN = 2.5V
VIN = 2.8V
\
VIN = 4.0V
0
5
10 15
20
25
30
35 40
45
50
0
5
10
15
20
25
30
35
40
45
50
Load Current (mA)
Load Current (mA)
TC1240-1 7/7/00
7
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