Rainbow-electronics MAX868 Manual do Utilizador descarregar pdf (Página 4)

MAX868

Regulated, Adjustable -2x

Inverting Charge Pump

4 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 5, T

= +25°C, unless otherwise noted.)

0.01 10.1 10 100

EFFICIENCY vs. LOAD CURRENT

= 5V)

MAX868-04

LOAD CURRENT (mA)

EFFICIENCY (%)

OUT

= -5V

OUT

= -7.5V

OUT

= -3.3V

0.01 10.1 10 100

EFFICIENCY vs. LOAD CURRENT

= 3.3V)

MAX868-05

LOAD CURRENT (mA)

EFFICIENCY (%)

OUT

= -5V

OUT

= -3.3V

0.01 10.1 10 100

EFFICIENCY vs. LOAD CURRENT

= 5V)

MAX868-06

LOAD CURRENT (mA)

EFFICIENCY (%)

CIRCUIT OF FIGURE 6

OUT

= -2.5V

OUT

= -3.3V

100

180

160

140

120

200

-40 -20 0 20 40 60 80 100

OPEN-LOOP OUTPUT IMPEDANCE

vs. TEMPERATURE

(FB = IN, V

OUT

= -2 x V

)

MAX868-07

TEMPERATURE (°C)

OUTPUT IMPEDANCE (Ω)

= 2V

= 3.3V

= 5V

20µs/div

20mV/div

= 3.3V, V

OUT

= -3.3V, I

LOAD

= 5mA,

OUT

AC COUPLED (20mV/div), C

OUT

= 10µF CERAMIC

OUTPUT VOLTAGE RIPPLE

OUT

= 10µF CERAMIC)

MAX868-10

100

180

160

140

120

200

-40 -20 0 20 40 60 80 100

OPEN-LOOP OUTPUT IMPEDANCE

vs. TEMPERATURE

(FB = IN, V

OUT

= -V

)

MAX868-08

TEMPERATURE (°C)

OUTPUT IMPEDANCE (Ω)

= 2V

CIRCUIT OF FIGURE 6

= 3.3V

= 5V

20µs/div

20mV/div

= 3.3V, V

OUT

= -3.3V, I

LOAD

= 5mA,

OUT

AC COUPLED (20mV/div), C

OUT

= 10µF (AVX TPS)

OUTPUT VOLTAGE RIPPLE

OUT

= 10µF TANTALUM)

MAX868-09

20µs/div

20mV/div

= 3.3V, V

OUT

= -3.3V, I

LOAD

= 5mA,

OUT

AC COUPLED (20mV/div), C

OUT

= 2.2µF CERAMIC

OUTPUT VOLTAGE RIPPLE

MAX868-11

200µs/div

10mA/div

20mV/div

= 5V, V

OUT

= -5V, I

OUT

= 1mA TO 11mA STEP

LOAD-TRANSIENT RESPONSE

MAX868-12

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

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