MAX1800EHJ 查看數據表（PDF） - Maxim Integrated
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MAX1800EHJ Datasheet PDF : 24 Pages
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Digital Camera Step-Up
Power Supply
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VINPUT = 2.4V, TA = +25°C, unless otherwise noted.)
AUXILIARY CONTROLLER
MAXIMUM DUTY CYCLE vs. VDCON_
100
FB_ TO COMP_ SMALL-SIGNAL OPEN-LOOP
FREQUENCY RESPONSE
60
80
50
40
60
30
40
20
20
10
0
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
VDCON_ (V)
0
1
10
100
1000 10,000
FREQUENCY (kHz)
AUXILIARY CONTROLLER DEFAULT
MAXIMUM DUTY CYCLE vs. FREQUENCY
100
80
60
COSC = 470pF
40
OSCILLATOR FREQUENCY vs. ROSC
1000
COSC = 470pF
800
COSC = 220pF
600
COSC = 100pF
COSC = 47pF
400
20
200
0
0
200 400 600 800 1000
FREQUENCY (kHz)
0
1
10
100
1000
ROSC (kΩ)
MAIN OUTPUT STARTUP RESPONSE
MAX1800 toc11
VONM
2V/div
0V
MAIN
OUTPUT
VOLTAGE
0V
2V/div
LDO STARTUP RESPONSE
MAX1800 toc12
VONA
2V/div
0V
LDO
OUTPUT
VOLTAGE
0V
2V/div
0A
1.00 ms/div
MAIN LOAD = 24Ω
INPUT
CURRENT
1A/div
0A
1.00 ms/div
MAIN LOAD = 24Ω
LDO LOAD = 8Ω
INPUT
CURRENT
500mA/div
6 _______________________________________________________________________________________
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