Typical operating characteristics – Rainbow Electronics MAX1681 User Manual
Page 4
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(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.)
2.5
3.5
5.5
4.5
7.5
6.5
8.5
2.5
2.0
3.0
3.5
4.0
4.5
5.0
5.5
OUTPUT SOURCE RESISTANCE
vs. SUPPLY VOLTAGE
MAX1680/81TOC04
SUPPLY VOLTAGE (V)
OUTPUT SOURCE RESISTANCE (
Ω
)
0
1
3
2
5
4
6
-20
-40
0
20
40
60
80
100
OUTPUT SOURCE RESISTANCE vs.
TEMPERATURE
MAX1680/81TOC05
TEMPERATURE (°C)
OUTPUT SOURCE RESISTANCE (
Ω
)
V
INPUT
= 3V
V
INPUT
= 5V
100
0
1
100
1000
MAX1680 EFFICIENCY vs.
LOAD CURRENT (INVERTER CONFIGURATION)
20
40
60
80
MAX1680/81TOC06
LOAD CURRENT (mA)
EFFICIENCY (%)
10
V
INPUT
= 5.5V
V
INPUT
= 4V
V
INPUT
= 3V
FSEL = IN
0
200
100
500
400
300
700
600
800
0
60
80
20
40
100
120
140
OUTPUT VOLTAGE DROP
vs. LOAD CURRENT
MAX1680/81TOC01
LOAD CURRENT (mA)
OUTPUT VOLTAGE DROP (mV)
V
INPUT
= 3V
V
INPUT
= 5V
-14
-10
-12
-4
-6
-8
0
-2
2
2.0
3.5
4.0
2.5
3.0
4.5
5.0
5.5
OSCILLATOR FREQUENCY CHANGE
vs. SUPPLY VOLTAGE
MAX1680/81TOC02
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY CHANGE (%)
MAX1680
MAX1681
-10
-6
-8
-2
-4
2
0
4
8
6
10
-40
0
20
-20
40
60
80
100
OSCILLATOR FREQUENCY CHANGE
vs. TEMPERATURE
MAX1680/81TOC03
TEMPERATURE (°C)
OSCILLATOR FREQUENCY CHANGE (%)
MAX1680
MAX1681