Switched-Capacitor Voltage Converters
MAX1044/ICL7660
__________________________________________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 and OUTPUT RIPPLE
vs. LOAD CURRENT
MAX1044-Fig 2
OUTPUT VOLTAGE and OUTPUT RIPPLE
vs. LOAD CURRENT
720
OUTPUT RIPPLE (mVp-p)
OUTPUT VOLTAGE (V)
640
-9
-8
-7
-6
-5
-4
-3
-2
-1
A
0
0
5
10
15
20
25
30
35
40
LOAD CURRENT (mA)
0
OUTPUT
RIPPLE
B
C
V+ = 10V
LV = OPEN
OUTPUT
VOLTAGE
A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN
A
B
C
MAX1044-Fig 3
-2.0
OUTPUT
VOLTAGE
OUTPUT VOLTAGE (V)
-1.5
A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN
C
-0.5
B
V+ = 2V
LV = GND
400
350
OUTPUT VOLTAGE (V)
300
250
200
150
100
50
OUTPUT RIPPLE (mVp-p)
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
A
0
0
5
10
15
B
800
-10
700
630
OUTPUT RIPPLE (mVp-p)
SUPPLY CURRENT (mA)
560
490
420
350
280
210
140
70
OUTPUT VOLTAGE
A
A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN
C
B
560
480
C
400
320
-1.0
V+ = 5V
LV = OPEN
240
160
80
A
0
0
1
2
3
4
5
6
OUTPUT RIPPLE
7
8
9
10
0
OUTPUT RIPPLE
20
25
30
35
40
0
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY and SUPPLY CURRENT
vs. LOAD CURRENT
MAX1044-Fig 4
EFFICIENCY and SUPPLY CURRENT
vs. LOAD CURRENT
MAX1044-Fig 5
EFFICIENCY and SUPPLY CURRENT
vs. LOAD CURRENT
45
SUPPLY CURRENT (mA)
40
35
30
25
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
40
LOAD CURRENT (mA)
V+ = 10V
LV = OPEN
B, C
A
EFFICIENCY
A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN
SUPPLY CURRENT
MAX1044-Fig 6
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
8
V+ = 2V
LV = GND
SUPPLY CURRENT
EFFICIENCY
10
9
SUPPLY CURRENT (mA)
8
7
6
5
4
3
2
1
0
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
V+ = 5V
LV = OPEN
A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN
C
EFFICIENCY
A
B
50
100
50
45
40
35
30
25
20
15
10
5
0
SUPPLY CURRENT
20
15
10
5
0
9 10
40
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY
vs. OSCILLATOR FREQUENCY
MAX1044-Fig 7
OSCILLATOR FREQUENCY
vs. EXTERNAL CAPACITANCE
MAX1044-Fig 8
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX1044-Fig 9
100
90
EFFICIENCY (%)
80
70
60
50
40
30
10
1
10
2
10
3
10
4
10
5
EXTERNAL
HCMOS
OSCILLATOR
100,000
OSCILLATOR FREQUENCY (Hz)
10,000
1000
100
10
1
0.1
ICL7660 and
MAX1044 with
BOOST = OPEN
MAX1044 with
BOOST -V+
100,000
OSCILLATOR FREQUENCY (Hz)
C1, C2 = 100µF
C1, C2 = 10µF
C1, C2 = 1µF
10,000
1000
6x10
5
100
1
10
100
1000
10,000 100,000
1
2
C
OSC
(pF)
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
3
4
5
6
7
8
9
10
OSCILLATOR FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
