MAX1779 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1779 Datasheet PDF : 18 Pages
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Low-Power Triple-Output TFT LCD DC-DC
Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 5, VIN = +3.3V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(BOOST CONVERTER AND CHARGE PUMPS)
100
VMAIN = +5V
90
TWO-STAGE
CHARGE PUMPS
80
VMAIN = +10V
SINGLE-STAGE
70
CHARGE PUMPS
60
50
0
VNEG = -8V, INEG = 1mA
VPOS = +12V, IPOS = 1mA
50 100 150 200 250
IMAIN (mA)
NEGATIVE CHARGE-PUMP OUTPUT VOLTAGE
vs. LOAD CURRENT
-7.76
VSUPN = +5V
-7.80
-7.84
VSUPN = +6V
-7.88
-7.92
-7.96
VSUPN = +7V
-8.00
-8.04
-8.08
0
5
10
15
20
INEG (mA)
NEGATIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
100
90
80
VSUPN = +5V
70
VSUPN = +6V
60
50
VSUPN = +7V
40
30
0
VNEG = -8V
5
10
15
20
INEG (mA)
POSITIVE CHARGE-PUMP OUTPUT VOLTAGE
vs. LOAD CURRENT
12.24
POSITIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
100
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
300
12.12
12.00
11.88
VSUPP = +7V
11.76
11.64
0
VSUPP = +5V
VSUPP = +6V
5 10 15 20 25 30
IPOS (mA)
90
80
70
60
50
40
30
0
VSUPP = +5V
VSUPP = +6V
VSUPP = +7V
VPOS = +12V
5 10 15 20 25 30
IPOS (mA)
280
260
240
220
200
2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
1.256
RIPPLE WAVEFORMS
MAX1779-14
LOAD TRANSIENT
(L = 10µH, 500µs PULSE)
5.1V
MAX1779-15
1.254
1.252
5V
A
5.0V
A
1.250
1.248
1.246
-8V
B
4.9V
50mA
12V
C
B
0
1.244
0
10
20
30
40
50
IREF (µA)
4.0µs/div
A. VMAIN = 5V, IMAIN = 100mA, 10mV/div
B. VNEG = -8V, INEG = 1mA, 5mV/div
C. VPOS = 12V, IPOS = 1mA, 5mV/div, FIGURE 5
100µs/div
A. VMAIN = 5V, 50mV/div
B. VMAIN = 5mA to 50mA, 25mA/div
FIGURE 6
6 _______________________________________________________________________________________
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