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Rainbow-electronics MAX1748 Manual de usuario Pagina 5

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MAX1748
Triple-Output TFT LCD DC-DC Converter
_______________________________________________________________________________________ 5
9.84
9.90
9.88
9.86
9.92
9.94
9.96
9.98
10.00
10.02
10.04
0 200100 300 400 500 600
MAIN OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1748 toc01
I
MAIN
(mA)
V
MAIN
(V)
V
IN
= 3.3V
V
IN
= 5.0V
60
65
70
75
80
85
90
95
100
0 200100 300 400 500 600
MAIN STEP-UP CONVERTER
EFFICIENCY vs. LOAD CURRENT
(BOOST ONLY)
MAX1748toc02
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= 3.3V
V
MAIN
= 10V
V
IN
= 5.0V
60
65
70
75
80
85
90
95
100
0 200100 300 400 500 800600 700
MAIN STEP-UP CONVERTER
EFFICIENCY vs. LOAD CURRENT
(BOOST ONLY)
MAX1748toc03
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= 3.3V
V
MAIN
= 8V
V
IN
= 5.0V
50
55
60
65
70
75
80
85
90
0 10050 150 200 250 400300 350
EFFICIENCY vs. LOAD CURRENT
(BOOST CONVERTER AND CHARGE PUMPS)
MAX1748toc04
I
MAIN
(mA)
EFFICIENCY (%)
V
MAIN
= 8V
V
IN
= 3.3V
V
NEG
= -5V WITH I
NEG
= 10mA
V
POS
= 15V WITH I
POS
= 5mA
V
MAIN
= 10V
-5.05
-4.95
-5.00
-4.80
-4.85
-4.90
-4.65
-4.70
-4.75
-4.60
015205 10 25303540
NEGATIVE CHARGE-PUMP OUTPUT
VOLTAGE vs. LOAD CURRENT
MAX1748toc05
I
NEG
(mA)
V
NEG
(V)
V
SUPN
= 6V
V
NEG
= -5V
V
SUPN
= 8V
V
SUPN
= 10V
20
30
50
40
70
60
80
015205 10 25303540
NEGATIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
MAX1748toc06
I
NEG
(mA)
EFFICIENCY (%)
V
SUPN
= 6V
V
NEG
= -5V
V
SUPN
= 8V
V
SUPN
= 10V
Typical Operating Characteristics
(Circuit of Figure 5, V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3.0V, SHDN = IN, V
SUPP
= V
SUPN
= 10V, TGND = PGND = GND, C
REF
= 0.22µF, C
INTG
= 470pF, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
LOGIC SIGNALS
SHDN Input Low Voltage 0.45V hysteresis (typ) 0.9 V
SHDN Input High Voltage 2.1 V
SHDN
Input Current I
SHDN
1 µA
RDY Output Low Voltage I
SINK
= 2mA 0.5 V
RDY Output High Leakage V
RDY
= 13V 1 µA
Note 1: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
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