Rainbow-electronics MAX861 Manual de usuario descargar pdf (Pagina 3)

MAX860/MAX861

50mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuit (Inverter), V

= +5V,

–

—

–

= V

, FC = LV = GND, C1 = C2 = 10µF (Note 2), T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at T

= +25°C.)

Note 2: C1 and C2 are low-ESR (<0.2Ω) aluminum electrolytics. Capacitor ESR adds to the circuit’s output resistance. Using

capacitors with higher ESR may reduce output voltage and efficiency.

Note 3: Specified output resistance includes the effect of the 0.2Ω ESR of the test circuit’s capacitors.

Note 4: The switches are driven directly at the oscillator frequency, without any division.

Note 5: At lowest frequencies, using 10µF capacitors gives worse efficiency figures than using the recommended capacitor

values in Table 3, due to larger 1 ⁄ (f

x C1) term in R

OUT

–

—

–

< 0.3V

MAX860

LV = GND

No load

MAX860/MAX861, FC = V

= 50mA to GND, C1 = C2 = 68µF

MAX860,

FC = V

MAX861,

FC = V

MAX861

FC < 4V

CONDITIONS

µA

Shutdown Supply Current

0.3V

–

—

–

Threshold

1.2V

%99 99.9Voltage-Conversion Efficiency

Power Efficiency (Note 5)

88 92

93 96

80 130

30 50

90 93

93 96

813

60 100

kHz

160 250

Switching Frequency

(Note 4)

µA-2 -4I

FC Current (from V

)

UNITSMIN TYP MAXSYMBOLPARAMETER

No load, V

OUT

= -4V µs500Time to Exit Shutdown

FC = V

FC = GND

FC = OUT

FC = V

FC = GND

FC = OUT

= 2kΩ from V

to OUT

= 1kΩ from OUT

to GND

= 2kΩ from V

to OUT

= 1kΩ from OUT

to GND

MAX86_I/E

MAX86_M

1 2 3 4 5 6 7 8 ... 11 12

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Rainbow-electronics MAX861 Manual de usuario Pagina 3

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