MAX1885 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1885 Datasheet PDF : 38 Pages
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Quad-Output TFT LCD DC-DC
Converters with Buffer
Typical Operating Characteristics
(Circuit of Figure 1, VIN = +3.3V, SHDN = IN, VMAIN = VSUPP = VSUPN = VSUPB = VSUPL = 8V, BUF- = BUFOUT,
BUF+ = FLTSET = TGND = PGND = GND, TA = +25°C.)
MAIN 8V OUTPUT VOLTAGE
vs. LOAD CURRENT
8.12
8.08 VIN = 3.3V
MAIN 8V OUTPUT EFFICIENCY
vs. LOAD CURRENT
100
VIN = 5V
90
MAIN 12V OUTPUT VOLTAGE
vs. LOAD CURRENT
12.24
12.16
8.04
8.00
7.96
7.92
7.88
0
VIN = 5V
CINTG = 470pF
RCOMP = 24kΩ
CCOMP = 470pF
200
400
600
800
IOUT (mA)
80
VIN = 3.3V
70
60
VOUT = 8V
50 RCOMP = 24kΩ
CCOMP = 470pF
CINTG = 470pF
40
0
200
400
600
800
IOUT (mA)
12.08
12.00
VIN = 3.3V
11.92
VIN = 5V
11.84
11.76
0
FIGURE 8
CINTG = 470pF
100 200 300 400 500 600
IOUT (mA)
MAIN 12V OUTPUT EFFICIENCY
vs. LOAD CURRENT
100
VIN = 5V
90
80
VIN = 3.3V
70
60
50
40
0
FIGURE 8
VOUT = 12V
CINTG = 470pF
100 200 300 400 500 600
IOUT (mA)
POSITIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
100
90
VSUPP = 7V
VSUPP = 7.5V
80
VSUPP = 8V
70
60
VSUPP = 10V
50
40
30
0
VPOS = 20V
5
10
15
20
INEG (mA)
STEP UP CONVERTERS
SWITCHING FREQUENCY vs. INPUT VOLTAGE
1.20
MAX1778
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
MAXIMUM POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
40
35
30
IPOS = 1mA
25
IPOS = 10mA
20
15
10
5
2 4 6 8 10 12 14
VSUPP (V)
POSITIVE CHARGE-PUMP OUTPUT VOLTAGE
vs. LOAD CURRENT
20.2
20.0
VSUPP = 10V
19.8
VSUPP = 8V
19.6
VSUPP = 7.5V
19.4
VSUPP = 7V
19.2
0
5
10
15
20
IPOS (mA)
NEGATIVE CHARGE-PUMP OUTPUT VOLTAGE
vs. LOAD CURRENT
-4.90
-4.92
-4.94
VSUPN = 6V
VSUPN = 7V
-4.96
-4.98
VSUPN = 8V
-5.00
-5.02
-5.04
0
10
20
30
40
INEG (mA)
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