Rainbow-electronics MAX1681 Manual do Utilizador descarregar pdf (Página 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

= +25°C, unless otherwise noted. Test results are also valid for

the doubler configuration with LV = OUT and T

= +25°C.)

2.5

3.5

5.5

4.5

7.5

6.5

8.5

2.52.0 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)

-20-40 0 20 40 60 80 100

OUTPUT SOURCE RESISTANCE vs.

TEMPERATURE

MAX1680/81TOC05

TEMPERATURE (°C)

OUTPUT SOURCE RESISTANCE (Ω)

INPUT

= 3V

INPUT

= 5V

100

1 100 1000

MAX1680 EFFICIENCY vs.

LOAD CURRENT (INVERTER CONFIGURATION)

MAX1680/81TOC06

LOAD CURRENT (mA)

EFFICIENCY (%)

INPUT

= 5.5V

INPUT

= 4V

INPUT

= 3V

FSEL = IN

200

100

500

400

300

700

600

800

0 60 8020 40 100 120 140

OUTPUT VOLTAGE DROP

vs. LOAD CURRENT

MAX1680/81TOC01

LOAD CURRENT (mA)

OUTPUT VOLTAGE DROP (mV)

INPUT

= 3V

INPUT

= 5V

-14

-10

-12

-4

-6

-8

-2

2.0 3.5 4.02.5 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

-40 0 20-20 40 60 80 100

OSCILLATOR FREQUENCY CHANGE

vs. TEMPERATURE

MAX1680/81TOC03

TEMPERATURE (°C)

OSCILLATOR FREQUENCY CHANGE (%)

MAX1680

MAX1681

1 2 3 4 5 6 7 8 9 10 11 12

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