MAX1044/ICL7660
Switched-Capacitor Voltage Converters
Typical Operating Characteristics
(V+ = 5V; C
BYPASS
= 0.1μF; C1 = C2 = 10μF; LV = open; OSC = open; T
A
= +25°C; unless otherwise noted.)
OUTPUT VOLTAGE AND OUTPUT RIPPLE
vs. LOAD CURRENT
MAX1044-Fig 1
OUTPUT
VOLTAGE
350
OUTPUT RIPPLE (mV
p-p
)
-4.5
OUTPUT VOLTAGE (V)
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0
5
10
B
A
OUTPUT VOLTAGE
A
A: MAX1044 WITH
BOOST = V+
B: ICL7660
C: MAX1044 WITH
BOOST = OPEN
C
B
MAX1044-Fig 2
-2.0
400
-5.0
OUTPUT VOLTAGE AND OUTPUT RIPPLE
vs. LOAD CURRENT
800
720
560
480
OUTPUT RIPPLE (mV
p-p
)
SUPPLY CURRENT (mA)
640
OUTPUT VOLTAGE (V)
-1.5
-1.0
A: MAX1044 WITH
BOOST = V+
B: ICL7660
C: MAX1044 WITH
BOOST = OPEN
C
B
A
V+ = 2V
LV = GND
OUTPUT RIPPLE
300
250
200
150
100
50
5
6
7
8
9
10
0
C
V+ = 5V
LV = OPEN
400
320
240
160
80
40
-0.5
0
OUTPUT RIPPLE
0
1
2
3
4
15
20
25
30
35
0
LOAD CURRENT (mA)
LOAD CURRENT (mA)
-9
OUTPUT VOLTAGE (V)
-8
-7
-6
-5
-4
-3
-2
-1
0
0
OUTPUT
VOLTAGE
A: MAX1044 WITH
BOOST = V+
B: ICL7660
C: MAX1044 WITH
BOOST = OPEN
OUTPUT
RIPPLE
B
A
5
10
15
20
25
C
A
MAX1044-Fig 3
B
C
630
OUTPUT RIPPLE (mV
p-p
)
560
490
420
350
280
90
80
EFFICIENCY (%)
MAX1044-Fig 4
-10
OUTPUT VOLTAGE AND OUTPUT RIPPLE
vs. LOAD CURRENT
EFFICIENCY AND SUPPLY CURRENT
vs. LOAD CURRENT
700
100
10
9
7
6
5
SUPPLY CURRENT (mA)
8
EFFICIENCY
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
V+ = 2V
LV = GND
8
9
10
SUPPLY CURRENT
4
3
2
1
0
V+ = 10V
LV = OPEN
210
140
70
0
30
35
40
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY AND SUPPLY CURRENT
vs. LOAD CURRENT
MAX1044-Fig 5
90
80
EFFICIENCY (%)
EFFICIENCY
A: MAX1044 WITH
BOOST = V+
B: ICL7660
C: MAX1044 WITH
BOOST = OPEN
A
C
45
SUPPLY CURRENT (mA)
40
35
30
25
90
80
EFFICIENCY (%)
B, C
A
EFFICIENCY
MAX1044-Fig 6
100
50
EFFICIENCY AND SUPPLY CURRENT
vs. LOAD CURRENT
100
50
45
40
35
30
25
B
70
60
50
40
30
20
10
0
0
70
60
50
40
30
20
10
0
0
SUPPLY CURRENT
V+ = 5V
LV = OPEN
20
15
10
5
40
A: MAX1044 WITH
BOOST = V+
B: ICL7660
C: MAX1044 WITH
BOOST = OPEN
SUPPLY CURRENT
20
15
10
5
40
5
10
15
20
25
30
35
0
V+ = 10V
LV = OPEN
5
10
15
20
25
30
35
0
LOAD CURRENT (mA)
LOAD CURRENT (mA)
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