Rainbow-electronics MAX889 Manual do Utilizador descarregar pdf (Página 4)

MAX889

High-Frequency, Regulated,

200mA, Inverting Charge Pump

4 _______________________________________________________________________________________

0 10050 150 200 250 300 350

MAX889T

OUTPUT RIPPLE

vs. LOAD CURRENT vs. C

OUT

MAX889 toc04

LOAD CURRENT (mA)

OUTPUT RIPPLE (mV)

OUT

= 2.2

OUT

= 4.7

OUT

= 10

100

0200100 300 400 500

EFFICIENCY vs. LOAD CURRENT

= 5V, V

OUT

= -3.3V)

MAX889 toc05

LOAD CURRENT (mA)

EFFICIENCY (%)

MAX889T

MAX889R

MAX889S

100

0 50 100 150 200 250 300 350

EFFICIENCY vs. LOAD CURRENT

= 3.3V, V

OUT

= -2.5V)

MAX889 toc06

LOAD CURRENT (mA)

EFFICENCY (%)

MAX889R

MAX889T

MAX889S

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= V

SHDN

= +5V, capacitors from Table 1, T

= +25°C, unless otherwise noted.)

MAX889S

LOAD-TRANSIENT RESPONSE

MAX889 toc10

40µs/div

20 TO 200mA LOAD STEP

CIRCUIT OF FIGURE 4

A: I

OUT

, 100mA/div

B: V

OUT

, 20mV/div, AC-COUPLED

MAX889S

LINE-TRANSIENT RESPONSE

MAX889 toc11

40µs/div

OUT

= 200mA

CIRCUIT OF FIGURE 4

A: V

, 2V/div

B: V

OUT

, 10mV/div, AC-COUPLED

MAX889S

STARTUP AND SHUTDOWN

MAX889 toc12

2ms/div

OUT

= 200mA

A: V

OUT

, 1V/div

B: I

, 100mA/div

C: V

SHDN

, 10V/div

1.50

2.00

1.75

2.50

2.25

2.75

3.00

2.5 3.5 4.03.0 4.5 5.0 5.5

FREE-RUN OUTPUT RESISTANCE

vs. INPUT VOLTAGE

MAX889 toc07

INPUT VOLTAGE (V)

OUT

(Ω)

1.0

1.5

2.0

2.5

3.0

FREE-RUN OUTPUT RESISTANCE

vs. TEMPERATURE

MAX889 toc08

TEMPERATURE (

OUT

(Ω)

-40 20 40-20 0 60 80

2.5 3.5 4.03.0 4.5 5.0 5.5

QUIESCENT SUPPLY CURRENT

vs. INPUT VOLTAGE (REGULATED MODE)

MAX889 toc09

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

MAX889T

MAX889S

MAX889R

OUT

= -2.5V

1 2 3 4 5 6 7 8

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