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MAX1680 Datasheet, PDF (5/12 Pages) Maxim Integrated Products – 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
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125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
____________________________Typical Operating Characteristics (continued)
(All curves generated using the inverter configuration shown in the Typical Operating Circuits with LV = GND, FSEL = IN or LV,
C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF (MAX1681), and TA = +25°C, unless otherwise noted. Test results are also valid for
the doubler configuration with LV = OUT and TA = +25°C.)
MAX1681 EFFICIENCY vs.
LOAD CURRENT (DOUBLER CONFIGURATION)
100
80
60
VINPUT = 3V
40
VINPUT = 4V
20
0
1
VINPUT = 5.5V
FSEL = IN
10
100
1000
LOAD CURRENT (mA)
MAX1680 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
9
DOUBLER MODE
8
FSEL = LV
7
6
INVERTER MODE
FSEL = LV
5
DOUBLER MODE
4
FSEL = IN
3
2
1
INVERTER MODE
FSEL = IN
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
MAX1681 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
30
DOUBLER MODE
25
FSEL = LV
20
INVERTER MODE
FSEL = LV
DOUBLER MODE
15
FSEL = IN
10
5
INVERTER MODE
FSEL = IN
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)
10
9
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)
10
VINPUT = 3V, FSEL = LV
9
VINPUT = 3V, FSEL = LV
8
VINPUT = 5V, FSEL = LV
7
6
VINPUT = 3V, FSEL = IN
8
7
VINPUT = 5V, FSEL = LV
6
VINPUT = 3V, FSEL = IN
VINPUT = 5V, FSEL = IN
5
5
VINPUT = 5V, FSEL = IN
4
4
3
0 2 4 6 8 10 12 14 16 18 20
CAPACITANCE (µF)
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)
10
3
0 24
6 8 10 12 14 16 18 20
CAPACITANCE (µF)
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)
10
9
9
8
7
6
5
4
3
0
24
VINPUT = 3V, FSEL = LV
VINPUT = 3V, FSEL = IN
VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
6 8 10 12 14 16 18 20
CAPACITANCE (µF)
8
VINPUT = 3V, FSEL = LV
7
VINPUT = 3V, FSEL = IN
6
5
VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
4
3
0
24
6 8 10 12 14 16 18 20
CAPACITANCE (µF)
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