Rainbow-electronics MAX871 Manual de usuario descargar pdf (Pagina 4)

_____________________Pin Description

MAX870/MAX871

Switched-Capacitor Voltage Inverters

4 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= +5V, C1 = C2 = C3, T

= +25°C, unless otherwise noted.)

100

0 10 15 205 25 30 35 4540 50

MAX870

EFFICIENCY vs. OUTPUT CURRENT

MAX870/71-TOC10

OUTPUT CURRENT (mA)

EFFICIENCY (%)

= 2.0V

= 3.3V

= 5.0V

0 15 205 10 25 30 35 40

MAX871

EFFICIENCY vs. OUTPUT CURRENT

MAX870/71 TOC11

OUTPUT CURRENT (mA)

EFFICIENCY (%)

= 2.0V

= 3.3V

= 5.0V

100

250

200

150

300

350

400

450

500

550

600

-40 10-15 35 60 85

PUMP FREQUENCY vs. TEMPERATURE

MAX870/71-TOC12

TEMPERATURE (°C)

PUMP FREQUENCY (kHz)

= 1.5V, MAX871

= 1.5V, MAX870

= 3.3V OR 5.0V, MAX870

= 3.3V OR 5.0V, MAX871

MAX870

OUTPUT NOISE AND RIPPLE

MAX870/71-TCC13

2µs/div

= 3.3V, V

OUT

= -3.18V, I

OUT

= 5mA,

20mV/div, AC COUPLED

Flying Capacitor’s Positive TerminalC1+5

GroundGND4

Flying Capacitor’s Negative TerminalC1-3

Positive Power-Supply InputIN2

Inverting Charge-Pump OutputOUT

FUNCTIONNAME

VOLTAGE INVERTER

OUT

C1+

0.33µF*

*1µF

(MAX870)

0.33µF*

OUT

GNDC1-

MAX870

MAX871

Figure 1. Test Circuit

MAX871

OUTPUT NOISE AND RIPPLE

MAX870/71-TCC14

1µs/div

= 3.3V, V

OUT

= -3.14V, I

OUT

= 5mA,

20mV/div, AC COUPLED

1 2 3 4 5 6 7 8

MAX870/MAX871 1

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Rainbow-electronics MAX871 Manual de usuario Pagina 4

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