MAX1044/ICL7660
Switched-Capacitor Voltage Converters
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
EFFICIENCY
vs. OSCILLATOR FREQUENCY
MAX1044-Fig 7
EFFICIENCY (%)
80
70
60
50
40
30
10
1
OSCILLATOR FREQUENCY (Hz)
90
C1, C2 = 100µF
C1, C2 = 10µF
C1, C2 = 1µF
10,000
1000
100
10
1
0.1
ICL7660 AND
MAX1044 WITH
BOOST = OPEN
MAX1044 WITH
BOOST -V+
EXTERNAL
HCMOS
OSCILLATOR
10
2
10
3
10
4
10
5
6x10
5
OSCILLATOR FREQUENCY (Hz)
1
10
100
1000
10,000 100,000
C
OSC
(pF)
OSCILLATOR FREQUENCY (kHz)
OSCILLATOR FREQUENCY (Hz)
80
A
10,000
60
40
20
0
C
A: MAX1044 WITH
BOOST = V+
B: ICL7600
C: MAX1044 WITH
BOOST = OPEN
1000
0
FROM TOP TO BOTTOM AT 5V
MAX1044, BOOST = V+, LV = GND
MAX1044, BOOST = V+, LV = OPEN
ICL7660, LV = GND
ICL7660, LV = OPEN
MAX1044, BOOST = OPEN, LV = GND
MAX1044, BOOST = OPEN, LV = OPEN
B
1
2
3
4
5
6
7
8
9
10
-50
-25
0
25
50
75
100
125
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
QUIESCENT CURRENT
vs. OSCILLATOR FREQUENCY
MAX1044-Fig 11
10,000
QUIESCENT CURRENT (μA)
1000
USING
EXTERNAL
CAPACITOR
USING
EXTERNAL
HCMOS
OSCILLATOR
10
0
10
1
10
2
10
3
10
4
10
5
5x10
5
100
10
1
OSCILLATOR FREQUENCY (Hz)
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Maxim Integrated
│
4
MAX1044-Fig 10
MAX1044-Fig 9
100,000
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
100
OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX1044-Fig 8
100
OSCILLATOR FREQUENCY
vs. EXTERNAL CAPACITANCE
100,000
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