MAX8740 データシートの表示（PDF） - Maxim Integrated
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MAX8740 Datasheet PDF : 12 Pages
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TFT-LCD Step-Up DC-DC Converter
Typical Operating Characteristics
(Circuit of Figure 1. VIN = 5V, VMAIN = 15V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(1.2MHz OPERATION)
100
L = 2.7µH
90 fOSC = 1.2MHz VIN = 5.0V
80
VIN = 3.3V
70
60
50
40
1
10
100
1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
L = 5.6µH
fOSC = 640kHz VIN = 5.0V
90
80
VIN = 3.3V
70
60
50
40
1
10
100
1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
12.9
12.7
12.5
VIN = 5.0V
12.3
12.1
VIN = 3.3V
11.9
fOSC = 1.2MHz
11.7 L = 2.7µH
11.5
1
10
100
1000
LOAD CURRENT (mA)
10,000
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
1400
SUPPLY CURRENT vs. SUPPLY VOLTAGE
0.7
SUPPLY CURRENT vs. TEMPERATURE
(SWITCHING)
0.60
1200
FREQ = IN
0.6
SWITCHING
0.5
1000
0.4
800
NONSWITCHING
FREQ = GND
0.3
600
0.2
VIN = 5.0V
0.55
VIN = 3.3V
0.50
400
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
0.1
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
0.45
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
SOFT-START
(RLOAD = 30Ω)
MAX8740 toc07
SWITCHING WAVEFORMS
(ILOAD = 800mA)
MAX8740 toc08
2ms/div
400ns/div
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