Rainbow-electronics MAX868 Manual de usuario Pagina 4

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MAX868
Regulated, Adjustable -2x
Inverting Charge Pump
4 _______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 5, T
A
= +25°C, unless otherwise noted.)
0
0.01 10.1 10 100
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 3.3V)
10
MAX868-05
LOAD CURRENT (mA)
EFFICIENCY (%)
50
40
30
20
60
70
80
V
OUT
= -5V
V
OUT
= -3.3V
0
0.01 10.1 10 100
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 5V)
10
MAX868-06
LOAD CURRENT (mA)
EFFICIENCY (%)
50
40
30
20
60
70
80
CIRCUIT OF FIGURE 6
V
OUT
= -2.5V
V
OUT
= -3.3V
0
60
40
20
100
80
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
IN
)
MAX868-07
TEMPERATURE (°C)
OUTPUT IMPEDANCE ()
V
IN
= 2V
V
IN
= 3.3V
V
IN
= 5V
20µs/div
20mV/div
V
IN
= 3.3V, V
OUT
= -3.3V, I
LOAD
= 5mA,
V
OUT
AC COUPLED (20mV/div), C
OUT
= 10µF CERAMIC
OUTPUT VOLTAGE RIPPLE
(C
OUT
= 10µF CERAMIC)
MAX868-10
0
60
40
20
100
80
180
160
140
120
200
-40 -20 0 20 40 60 80 100
OPEN-LOOP OUTPUT IMPEDANCE
vs. TEMPERATURE
(FB = IN, V
OUT
= -V
IN
)
MAX868-08
TEMPERATURE (°C)
OUTPUT IMPEDANCE ()
V
IN
= 2V
CIRCUIT OF FIGURE 6
V
IN
= 3.3V
V
IN
= 5V
20µs/div
20mV/div
V
IN
= 3.3V, V
OUT
= -3.3V, I
LOAD
= 5mA,
V
OUT
AC COUPLED (20mV/div), C
OUT
= 10µF (AVX TPS)
OUTPUT VOLTAGE RIPPLE
(C
OUT
= 10µF TANTALUM)
MAX868-09
20µs/div
20mV/div
V
IN
= 3.3V, V
OUT
= -3.3V, I
LOAD
= 5mA,
V
OUT
AC COUPLED (20mV/div), C
OUT
= 2.2µF CERAMIC
OUTPUT VOLTAGE RIPPLE
MAX868-11
200µs/div
10mA/div
20mV/div
V
IN
= 5V, V
OUT
= -5V, I
OUT
= 1mA TO 11mA STEP
LOAD-TRANSIENT RESPONSE
MAX868-12
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