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Rainbow-electronics MAX768 Manual de usuario Pagina 4

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MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
4 _______________________________________________________________________________________
20
0
-40 -15 35 85
SHDN SUPPLY CURRENT
vs. TEMPERATURE
MAX768-TOC07
TEMPERATURE (°C)
SHDN SUPPLY CURRENT (µA)
6010
4
2
8
6
10
12
14
16
18
V
IN
= 3.3V
V
IN
= 5.0V
90
0
0.1 1 10 100
EFFICIENCY vs. LOAD CURRENT
(NOUT ONLY LOADED)
10
20
30
40
50
60
70
80
MAX768 TOC10
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 3.0V
V
IN
= 4.0V
0.40
-0.05
-40 -15 35 85
SHDN SUPPLY CURRENT
vs. TEMPERATURE
MAX768-TOC08
TEMPERATURE (°C)
SHDN SUPPLY CURRENT (µA)
6010
0.05
0
0.15
0.10
0.20
0.25
0.30
0.35
V
IN
= 5.0V
V
IN
= 4.0V
V
IN
= 3.3V
115
10
2.5 3.0 4.0 6.0
CHARGE-PUMP FREQUENCY
vs. SUPPLY VOLTAGE
MAX768-TOC05
SUPPLY VOLTAGE (V)
CHARGE-PUMP FREQUENCY (kHz)
4.53.5 5.0 5.5
40
25
70
55
85
100
SYNC = GND
SYNC = IN
120
0
-55 -35 5 125
CHARGE-PUMP FREQUENCY
vs. TEMPERATURE
MAX768-TOC06
TEMPERATURE (°C)
CHARGE-PUMP FREQUENCY (kHz)
25-15 45 8565 105
40
20
80
60
100
SYNC = GND
SYNC = IN
V
IN
= 3.3V
1.8
0
2.5 3.0 4.0 6.0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (NO LOAD)
MAX768-TOC09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.04.5 5.53.5
0.4
0.2
0.8
0.6
1.0
1.2
1.4
1.6
f = 25kHz
f = 100kHz
90
0
0.1 1 10 100
EFFICIENCY vs. OUTPUT CURRENT
(POUT ONLY LOADED)
10
20
30
40
50
60
70
80
MAX768 TOC11
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 3.0V
V
IN
= 4.0V
90
0
0.1 1 10 100
EFFICIENCY vs. OUTPUT CURRENT
LOAD BETWEEN POUT AND NOUT
10
20
30
40
50
60
70
80
MAX768 TOC12
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 3.0V
V
IN
= 4.0V
____________________________Typical Operating Characteristics (continued)
(SYNC = IN, T
A
= +25°C, unless otherwise noted.)
4
0
0 40 120 320
SUPPLY CURRENT
vs. SYNC FREQUENCY
3
MAX768-TOC04
SYNC FREQUENCY (kHz)
SUPPLY CURRENT (mA)
16080 200 240 280
1
2
V
IN
= 3.3V
V
IN
= 5.0V
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