MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
_______________________________________________________________________________________
5
100
0
1 100 1000
MAX1681 EFFICIENCY vs.
LOAD CURRENT (DOUBLER CONFIGURATION)
20
40
60
80
MAX1680/81TOC07
LOAD CURRENT (mA)
EFFICIENCY (%)
10
V
INPUT
= 5.5V
V
INPUT
= 4V
V
INPUT
= 3V
FSEL = IN
1
0
3
2
6
5
4
8
7
9
2.0 3.5 4.02.5 3.0 4.5 5.0 5.5 6.0
MAX1680 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX1680/81TOC08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
DOUBLER MODE
FSEL = LV
INVERTER MODE
FSEL = IN
INVERTER MODE
FSEL = LV
DOUBLER MODE
FSEL = IN
0
5
15
10
25
20
30
3.02.5 3.5 4.0 4.5 5.0 5.5 6.0
MAX1681 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX1680/81TOC09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
DOUBLER MODE
FSEL = LV
INVERTER MODE
FSEL = IN
INVERTER MODE
FSEL = LV
DOUBLER MODE
FSEL = IN
3
4
6
5
7
8
9
10
0 4 6 82 10 12 14 1816 20
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)
MAX1680/81TOC10
CAPACITANCE (µF)
OUTPUT SOURCE RESISTANCE (Ω)
V
INPUT
= 3V, FSEL = LV
V
INPUT
= 5V, FSEL = LV
V
INPUT
= 3V, FSEL = IN
V
INPUT
= 5V, FSEL = IN
3
4
6
5
7
8
9
10
0 4 6 82 10 12 14 1816 20
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)
MAX1680/81TOC13
CAPACITANCE (µF)
OUTPUT SOURCE RESISTANCE (Ω)
V
INPUT
= 3V, FSEL = LV
V
INPUT
= 5V, FSEL = LV
V
INPUT
= 5V, FSEL = IN
V
INPUT
= 3V, FSEL = IN
3
4
6
5
7
8
9
10
0 4 6 82 10 12 14 1816 20
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)
MAX1680/81TOC11
CAPACITANCE (µF)
OUTPUT SOURCE RESISTANCE (Ω)
V
INPUT
= 3V, FSEL = LV
V
INPUT
= 5V, FSEL = LV
V
INPUT
= 5V, FSEL = IN
V
INPUT
= 3V, FSEL = IN
3
4
6
5
7
8
9
10
0 4 6 82 10 12 14 1816 20
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)
MAX1680/81TOC12
CAPACITANCE (µF)
OUTPUT SOURCE RESISTANCE (Ω)
V
INPUT
= 3V, FSEL = LV
V
INPUT
= 5V, FSEL = LV
V
INPUT
= 5V, FSEL = IN
V
INPUT
= 3V, FSEL = IN
____________________________Typical Operating Characteristics (continued)
(All curves generated using the inverter configuration shown in the
Typical Operating Circuit
s with LV = GND, FSEL = IN or LV,
C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF (MAX1681), and T
A
= +25°C, unless otherwise noted. Test results are also valid for
the doubler configuration with LV = OUT and T
A
= +25°C.)
(17 paginas)
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